how does a mechanical seal work for sale

A mechanical seal is simply a method of containing fluid within a vessel (typically pumps, mixers, etc.) where a rotating shaft passes through a stationary housing or occasionally, where the housing rotates around the shaft.

When sealing a centrifugal pump, the challenge is to allow a rotating shaft to enter the ‘wet’ area of the pump, without allowing large volumes of pressurized fluid to escape.

To address this challenge there needs to be a seal between the shaft and the pump housing that can contain the pressure of the process being pumped and withstand the friction caused by the shaft rotating.

Before examining how mechanical seals function it is important to understand other methods of forming this seal. One such method still widely used is Gland Packing.

Packing needs to press against the shaft in order to reduce leakage – this means that the pump needs more drive power to turn the shaft, wasting energy.

The stationary part of the seal is fitted to the pump housing with a static seal –this may be sealed with an o-ring or gasket clamped between the stationary part and the pump housing.

The rotary portion of the seal is sealed onto the shaft usually with an O ring. This sealing point can also be regarded as static as this part of the seal rotates with the shaft.

One part of the seal, either to static or rotary portion, is always resiliently mounted and spring loaded to accommodate any small shaft deflections, shaft movement due to bearing tolerances and out-of-perpendicular alignment due to manufacturing tolerances.

The primary seal is essentially a spring loaded vertical bearing - consisting of two extremely flat faces, one fixed, one rotating, running against each other.  The seal faces are pushed together using a combination of hydraulic force from the sealed fluid and spring force from the seal design. In this way a seal is formed to prevent process leaking between the rotating (shaft) and stationary areas of the pump.

If the seal faces rotated against each other without some form of lubrication they would wear and quickly fail due to face friction and heat generation. For this reason some form of lubrication is required between the rotary and stationary seal face; this is known as the fluid film

In most mechanical seals the faces are kept lubricated by maintaining a thin film of fluid between the seal faces. This film can either come from the process fluid being pumped or from an external source.

The need for a fluid film between the faces presents a design challenge – allowing sufficient lubricant to flow between the seal faces without the seal leaking an unacceptable amount of process fluid, or allowing contaminants in between the faces that could damage the seal itself.

This is achieved by maintaining a precise gap between the faces that is large enough to allow in a small amounts of clean lubricating liquid but small enough to prevent contaminants from entering the gap between the seal faces.

The gap between the faces on a typical  seal is as little as 1 micron – 75 times narrower than a human hair.  Because the gap is so tiny, particles that would otherwise damage the seal faces are unable to enter, and the amount of liquid that leaks through this space is so small that it appears as vapor – around ½ a teaspoon a day on a typical application.

This micro-gap is maintained using springs and hydraulic force to push the seal faces together, while the pressure of the liquid between the faces (the fluid film) acts to push them apart.

Without the pressure pushing them apart the two seal faces would be in full contact, this is known as dry running and would lead to rapid seal failure.

Without the process pressure (and the force of the springs) pushing the faces together the seal faces would separate too far, and allow fluid to leak out.

Mechanical seal engineering focuses on increasing the longevity of the primary seal faces by ensuring a high quality of lubricating fluid, and by selecting appropriate seal face materials for the process being pumped.

When we talk about leakage we are referring to visible leakage of the seal. This is because as detailed above, a very thin fluid film holds the two seal faces apart from each other. By maintaining a micro-gap a leak path is created making it impossible for a mechanical seal to be totally leak free. What we can say, however, is that unlike gland packing, the amount of leakage on a mechanical seal should be so low as to be visually undetectable.

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The challenges facing process industries have changed although they continue to pump fluids, some hazardous or toxic. Safety and reliability are still of prime importance. However, operators increase speeds, pressures, flow rates and even the severity of the fluid characteristics (temperature, concentration, viscosity, etc.) while processing many batch operations. For the operators of petroleum refineries, gas processing facilities and petrochemical and chemical plants, safety means controlling and preventing loss of, or exposure to, the pumped fluids. Reliability means pumps that operate efficiently and economically, with less required maintenance.

It is hard to believe that almost 30 years have passed since the mass promotion of sealless pump technology into the process industry. The new technology was promoted as the solution to all the issues and perceived limitations of mechanical seals. Some suggested that this alternative would eliminate the use of mechanical seals entirely.

However, not long after this promotion, end users learned that mechanical seals could meet or exceed legislated leakage and containment requirements. Further, pump manufacturers supported the technology by providing updated seal chambers to replace the old compression packing “stuffing boxes.”

Today’s seal chambers are designed specifically for mechanical seals, allowing for more robust technology in a cartridge platform, providing easier installation and creating an environment that allows the seals to function to their full potential.

In the mid 1980s, new environmental regulations forced the industry not only to look at containment and emissions, but also at equipment reliability. The average mean time between repair (MTBR) for mechanical seals in a chemical plant was approximately 12 months. Today, the average MTBR is 30 months. Currently, the petroleum industry, subject to some of the most stringent emission levels, has an average MTBR of more than 60 months.

Mechanical seals maintained their reputation by demonstrating the ability to meet and even exceed the requirements of best available control technology (BACT). Further, they did so while remaining an economical and energy efficient technology available to meet emission and environmental regulations.

Computer programs allow seals to be modeled and prototyped prior to manufacturing to confirm how they will handle specific operating conditions before being installed in the field. Seal manufacturing design capabilities and the technology of seal face materials has progressed to the point that they can be developed for a one-to-one fit for a process application.

Today’s computer modeling programs and technology allow the use of 3-D design review, finite element analysis (FEA), computational fluid dynamics (CFD), rigid body analysis and thermal imaging diagnostic programs that were not readily available in the past or were too costly for frequent use with earlier 2-D drafting. These advancements in modeling techniques have added to the design reliability of mechanical seals.

These programs and technologies have led the way to the design of standard cartridge seals with much more robust components. These included the removal of springs and dynamic O-rings from the process fluid and made flexible stator technology the design of choice.

Seals are a simple method of preventing fluid from escaping a vessel. Equipment like centrifugal pumps rely on seals to contain large volumes of pressurized fluid. There are two types of seals: the traditional pump packing known as mechanical packing or gland packing and the more modern mechanical seal. Mechanical packings rely on a rope-like packing, cut into rings, that wraps around the shaft of a pump to fill the voids and throttle or control the fluid from leaking.

Mechanical seals are often preferred when leakage is unacceptable, such as applications involving hazardous materials. Their durable construction can withstand more wear and tear than mechanical packing without leaking. We will explain how pump sealing works and describe the differences between pump packing versus mechanical seals to help you determine the best solution for your application.

Mechanical seals consist of three sealing components: rotating, stationary, and secondary seals. The seals prevent leaks from the circumferential gap between the shaft and other pump components. The rotating and stationary seals are lapped flat to keep fluid and gas from escaping. The rotating primary sealing element, fastened to the shaft, seals against the primary stationary sealing element, normally fastened to the gland.

Secondary seals are usually mounted between the stationary unit and the pump housing, and between the rotating unit and the pump shaft or sleeve. These are static seals, normally O-rings, PTFE wedges, or V-rings, and prevent leakage through these elements.

The rotating and stationary primary seals are the most vital sealing points. The faces of the mechanical seals press together with the force of a spring. In some cases, mechanical seals can also come as hydraulically balanced, in which case the fluid takes over from spring pressure to keep faces together while the pump is running. To make the mating surface as flat as possible, surfaces are lapped flat and machinists use high-precision light-band optical flats to ensure accuracy.

Protect Fluid Products From Leakage: Eliminates leaking common in packing. Leakage from packing is common compared to mechanical seals and can waste significant product.

Eliminates Sleeve Wear: Reliability of the seals eliminates frequent maintenance and removal of the sleeve that can result in costly sleeve replacement.

Cartridge Seals: Combines seal components, gland, and shaft sleeve into a single cartridge. They facilitate normally easier installation with preset face loading and quicker removal from pump shafts.

At MPRC Seals, we have been delivering reliable seals since 1982. We find solutions to the most difficult sealing issues for customers in a range of industries. To learn more about our customer-focused sealing solutions, request a quote today.

Thankyou for posting this informative article, I was looking for a little information on Mechanical seals as I wanted to buy them for my project. This article helped alot.

I recently attended the Turbomachinery and Pump Symposium, produced by the Texas A&M Turbomachinery Lab. I’ve been attending this conference off and on for 25 years and always sit in on the discussion groups for pump users and mechanical seal users. The same topics come up year after year.

Those topics are new for some of the people in the room, but those with decades of experience have heard them all before. There are two reasons why this happens:

New people are entering the industry and need to learn from those with decades of experience. If mechanical seal users keep my “top 5” in mind, they will avoid many of the problems I have been hearing about for 25 years.

It consists of two parallel faces sliding past each other. Image 1 is an example of a 90-year old mechanical seal patent (USPTO#2,100,220, issued 23 Nov 1937).

Take a look at any other mechanical seal design—including modern ones—and you will see the same thing. In normal operation, a hydrodynamic film will establish between the faces, which keeps them apart and provides lubrication. In most cases, this film will be the pumpage.

The parallelism between the sliding faces is essential for this lubricating film to establish itself (See “Solve Sealing Problems By Keeping Faces Close & Parallel,” Pumps & Systems, April 2016).

If the faces go out of parallel due to face deformation from excess pressure or temperature, the film will collapse causing the faces to come into contact and wear excessively or fail catastrophically.

Theoretically, the seal would last forever in normal operation. Wear occurs in stop/start conditions when the film collapses and the faces come into contact.

Abrasives between the sealing faces can also cause accelerated wear, so seal support systems are used to minimize this. Wear also occurs in process upset conditions.

If all conditions of No. 1 and No. 2 are met, a mechanical seal will not fail but will only need to be replaced due to normal wear. If a seal fails prematurely, it is because it was robbed of lubrication or the face parallelism was upset.

The seal cannot do this on its own, so a seal failure is usually an indication of something else in other parts of the fluid loop that robbed the lubrication or upset temperature or pressure. Dry running due to a lack of pumpage in the pump is a typical failure mechanism.

Image 2 shows such deformation, which causes the out-of-parallel condition and the outer diameter (OD) edge of the rotating face to come into contact with the stationary face.

The end results in that situation are temperature spikes, catastrophic wear and leakage. The bottom line of this point is that the root cause of a mechanical seal failure is often not the mechanical seal.

Since the basic design of the mechanical seal has done well and withstood the test of time, its design has not changed—and nothing on the horizon indicates that it will any time soon. Rather, seal performance has been enhanced through ring material and running surface improvements (See my articles on this topic in Pumps & Systems, June 2009, August 2014, August 2017).

Many ring materials, coatings, surface features and surface treatments have all been invented and applied to mitigate “failures” and extend seal life.

However, none of them will prevent the failure modes due to the root causes in No. 3. They will only buy the seal more time before it becomes damaged beyond usability.

The root causes in No. 3 usually occur when the pump is operated outside of its design envelope. The issues raised year after year in the pump and seal user discussion groups can usually be traced to operating the pump outside of its limits. Every pump and seal application is unique. There is no way to document them all.

Because of this, new users should seek out experienced users in their company to access the institutional knowledge those senior engineers have gained.

They should also seek out noted industry experts such as Heinz Bloch, Lev Nelik and Jim Elsey. These guys have decades of experience and are prolific writers (including in this publication) whose articles are valuable to avoid typical pitfalls. The mysteries surrounding mechanical seals have caused a lot of misunderstanding and misinformation.

So all users, especially new ones, should also seek out and read the writings of mechanical sealing authorities such as Alan Lebeck, Richard Salant, the Fluid Sealing Association and its technical director Henri Azibert.

Throughout this blog, we’ve spent a lot of time talking about mechanical seals for Waukesha Positive Displacement and Centrifugal pumps. For both pumps, we have single and double seal options. As you probably know, when you run a double seal (either o-ring or mechanical), you need to use a flush. But why is that? Let’s tackle that topic in today’s post.

A mechanical seal is a relatively simple device. Most commonly, it features a stationary seal and a rotating seal seat. In Waukesha Universal pumps, the standard seal configuration is a carbon stationary seal and a ceramic rotating seal seat. In a C114 with Type D seal, on the other hand, the stationary face is actually the stainless steel backplate and the carbon seal is the rotating piece.

The mechanical seal works by drawing a very small amount of fluid between the seal faces, preventing them from touching, which would destroy the seal. The product lubricates the seal faces, but can leak vapor from the high pressure side (product side) to the low pressure side (atmosphere).

Many times, for high pressure, high temperature, hazardous, or applications with sticky media, we’ll opt for a double mechanical seal. Functionality in a double mechanical seal is similar to a single mechanical seal. The inboard or primary seal keeps the product contained in the pump housing while the outboard or secondary seal prevents flush liquid from leaking to atmosphere. The flush is needed to extend seal life by both cleaning the seal faces and cooling the seal.

In regard to cooling, this is important, because as mentioned above, we are typically running a double seal in a high pressure or high temperature application. When two surfaces rub, they create friction and heat. Typically the product would act as a lubricant, but in the higher temperature applications, this isn’t enough to dissipate the heat, resulting in wear and eventual seal failure.

For sticky products, we need the seal flush to help clean the seal faces. Sticky, abrasive, and products that tend to plate can build up on the seals and cause wear, resulting in an uneven sealing surface. And what do you do when something gets sticky? You rinse with water. With abrasive products, if the rotary and stationary seal faces are not perfectly flat, we run the risk of a leak. We could just tackle this with a single mechanical seal with a flush, but typically we’ll see customers opt for the double mechanical option. With the double mechanical seal, the inner seal acts as the primary seal between the product on the pump side and atmosphere, while the secondary outer seal acts to prevent the flush liquid from leaking into the atmosphere.

Total containment is the final reason we’ll touch on that people will opt for a double mechanical seal, especially with hazardous fluids. In a single mechanical seal, we’re basically creating a low pressure zone between the two seal faces that draws product in and flashes it off to atmosphere. This isn’t good for a hazardous product. So again what we’ll do is opt for a double mechanical seal where the inner seal will at as the primary product seal and then the flush, typically run at a higher pressure will act as a barrier in the secondary seal, allowing complete containment of the hazardous product.

To close this post, it’s important to remember that for high pressure, high temperature applications or applications where we are running sticky, abrasive products, as well as hazardous applications, we’ll want to run a double mechanical seal with flush for maximum seal life. The double mechanical seal with flush allows for us to lubricate the seal faces, reducing heat and product accumulation, and thus maximizing seal life. The flush also creates a high pressure barrier that prevents hazardous products from leaking to atmosphere. If you have any questions about which seal you should choose for your Waukesha Sanitary Positive Displacement pump, contact a Triplex Sales Engineer today!

The mechanical seal acts as a check valve and a slider bearing. The obvious function is that of a check valve to prevent liquid under pressure from leaking out of the pump, or from drawing air into the pump when under vacuum conditions.

All bearings need lubricant and the seal lubricant is the liquid being pumped. Liquid infiltrates between the contact faces of the primary and mating rings.

Some of this liquid does find its way through to the atmosphere but is so slight as to only be noticed as corrosion of "build up" on the pump adapter.

These abrasive particles infiltrate with the liquid between the seal faces and grind away the carbon primary ring. The normal shiny face of the primary ring and mating ring.

The primary ring is made primarily of carbon. Should the pump be operated without liquid - even for a very short period of time - the primary and mating ring faces are denied lubricant. This causes the faces to become very hot.

The type of elastomertic material is selected to match the temperature limit and types of material being pumped. Should the temperature limit be exceeded, the diaphragm and O-ring will become hard and sometimes crack. The seal will then start to leak.

The forgoing is a brief discussion of some of the most common reason why seal life is shortened. Under normal conditions, seals wear out much faster than the

Mechanical seals are devices designed to prevent the leakage of fluids and gases during transport through rotating equipment, such as pumps and mixers. They are typically comprised of both stationary and rotary components, which together establish a secure seal.

There are many types of mechanical seals, with various designs, arrangements, and materials to handle liquids and gases at a variety of pressures, temperatures, and speeds.

Mechanical seals are essential parts of industrial pumping processes. To maintain a controlled flow of liquid, prevent leaks and cross-contamination, and sustain a high level of cleanliness, using the right seal is a must.

Before you can properly measure your seal, though, familiarize yourself with its elements. Though different seals have different parts, mechanical seals generally consist of four distinct sections:

Now that you know how to measure your mechanical seals, the next step toward determining what mechanical seal you needis to verify it meets the correct design and material requirements for your processes.

A cartridge seal is a self-contained unit housing the sealing components, pre-assembled and preset by the manufacturer. These can be equipped with one or two seals, depending on the usage.

A gas seal does not use a wetted barrier fluid, so the seal faces operate only on a thin film of air or nitrogen. These are primarily installed in applications where maximum protection against leaking or contamination is required.

Mechanical seal materials can determine whether it functions properly and how long it will last before requiring maintenance. The primary sealing surfaces are typically made from hard material, such as silicon carbide, ceramic, or tungsten carbide, in conjunction with a softer material, such as carbon. Many others can be used, depending on pressure, temperature, and chemical properties of the liquid inside.

Whether you’re selecting from a line of standard cartridge seals, or seeking something a bit more specialized, Sunair Co. can equip you with exactly the seal you need.

Supplying everything from non-chemical external seals to cartridge-mounted double seals, and providing a full range of support systems, including fluid distribution units, easy-clean systems, and myriad other configurations, you can trust Sunair Co. to keep your processes running smoothly.

Sunair Co. is the industry-leading expert on mechanical seals, pumps, compressors, and more. Our team has been developing custom systems and advising clients on which mechanical seals they need for their systems, across dozens of industries and hundreds of applications, for nearly 50 years.

Seals are vital to the functionality of any pump - but how do you pick a seal? The first question is whether you want an internal or an external seal. Internal seals sit inside the pump head with the product. External seals sit behind the pump head and are kept mostly dry and separate from the product. Once you have picked a seal location you can pick your seal type. When choosing your seal you should be considering the product being pumped, the temperatures, and the general pump needs.

While there are many seal options including the packing seal, and o-ring seal, the majority of sanitary pumps use mechanical seals. Mechanical seals are first and foremost sanitary, but they are also durable and easily replaceable. They use pressure to create a seal between the two seal faces with a thin layer of liquid between them for lubrication and use secondary seals to help prevent leaks around the faces.

The primary seals protect the housing or backplate and the shaft from wear. It  is comprised of two pieces: a stationary and a rotating seal. The stationary seal is located on the housing or backplate and the rotating seal is located on the shaft. Both primary seals have a extremely smooth faces to prevent undue friction. When the pump is running the pressure of the liquid presses the two seal faces together. When the pump is not running, a secondary pressure source is required to keep the faces together, this is often a spring, a series of springs, or occasionally a large squishy o-ring. A secondary seal is used between the rotating primary seal and the shaft, and between the stationary seal and the housing. The secondary seals prevent leakage from occurring; it can be a gasket, wedge, cup, or an o-ring seal. Minor leakage between the two primary seals is necessary to lubricate the seals and allow them to continue moving smoothly. The heat and movement of the pump and seal causes the liquid from the leak to evaporate quickly.

There are many different ways to make a mechanical seal. Not all mechanical seals are made equal. Our C-series pumps use a polished stainless steel backplate that serves as the stationary seal face. The backplate does not require a secondary seal, because it cannot leak. A ceramic or silicone carbide seat can be added if wanted, to protect the backplate from damage.

Our Hyginox internally sealed pumps and our RF pumps both have a silicone carbide or ceramic seat for the stationary seal face; the seats are pressed in to prevent their movement. The RF pumps and the Hyginox series pumps use an u-cup seal as a secondary stationary seal.

As a secondary seal on the rotating seal face of the C-series pumps we use an o-ring. The RF and hyginox pumps use a bellows seal. We use one large spring in all of our pumps to serve as the pressure on the primary seals. A drive collar is used on C-series pumps to maintain and fix the working length while the RF pumps use a step in the shaft. Because the Hyginox pumps have an internal seal the impeller serves this function.

External seals are easy to install, clean, check and maintain. They are ideal for corrosive materials, because the seal is seperate from the product being pumped and will not be affected by corrosion. Because they are external, if the seal does malfunction and a piece comes loose, then it is seperate from the product and will not harm anything. External seals have add on options of a seat (DG Seal) or a water cascade (F seal).

The CPE D seal is a single mechanical external seal. This is a traditional external mechanical seal. You cannot run the pump dry with this seal. It is recommended for liquids that will not crystalize or solidify.  This seal is often used in the brewing and alcohol, and beverage industries.

The CPE DG is a single mechanical external seal with a ceramic seat. It functions in the same way as a D seal, however there is an addition of a ceramic seat and flat teflon gaskets that protects the back plate from damage. The seat sits between the rotating seal and the back plate. When damage occurs, it is easier to replace a seat than the entire backplate. The DG seal is recommended for more abrasive products that may damage the back plate.

The CPE F seal is a single mechanical external seal with a water cascade. This is also known as a flush seal. Water needs to be hooked up to the pump and provides the cascade on the pump seal. The water keeps the seal clean, cool, and lubricated. This can help with the longevity and durability of the seal. An F seal is recommended for products that may crystalize, coagulate, or solidify, because the seal is continuously cleaned. Products that are high in sugar, or are sticky and viscous can leave a powder or residue on the seal, the water cascade washes it off.

Internal seals are ideal for viscous or hot products. The majority of the rotating portion of the seal is inside of the pump head with the product. Internal seals are constantly lubricated and flushed clean by the product being pumped, and are cleaned by the CIP process because of their handy location. The product serves to keep the seal cool and functioning correctly. Internally sealed pumps are becoming increasing popular in the brewing and craft beverage industry because of the high sugar content of the product being pumped. Our Hyginox series pumps are a centrifugal pump that features an internal seal.

Picking a seal can be stressful and confusing. The product, speed, and pump requirements should all be considered when picking the perfect seal for your pump.

Mechanical seals are usually made of moving rings, stationary rings, compression elements and sealing elements. These parts are tightly bonded to form a sealing surface to avoid leakage. The liquid in the sealed chamber causes the end face to press against the end face of the stationary ring, and the mechanical seal occurs on the end faces of the two rings and the adhesion is to maintain the compression of the component pressure. The pump can not only work in the state, but also adhere to the end of the paste to ensure that the sealing medium does not leak, and avoid impurities into the sealed end. The sealing element acts as a gap between the sealing ring and the shaft, the action of the static ring and the gap of the gland, and the oscillation of the pump with the elastic element. When running with other components of the pump, the condition of the mechanical seal is closely linked with the external conditions. Only if the parts, auxiliary sealing equipment and technical requirements are ensured that the mechanical seal works well.

First, we need to turn off the pump, and then clean and inspect each part of the pump. Second, remove the impeller by rotating it in the anticlockwise direction. Then take out the seal at the backside of the impeller, and place the mechanical seal on to the shaft. Fix the mechanical seal and screw the impeller onto the motor shaft. Here are some notes of installation:

The compression quantity of the spring should be carried out according to the regulations. Bigger or smaller are not allowed. The error should be within 2 millimeters;

To ensure the beard can move flexibly on the shaft. And the spring should be able to automatically bounce back when the dynamic ring compressing the spring.

With its wide range of designs, the mechanical seals can also be made of different materials. In fact, the seal face materials decide the service time of mechanical seals. The most popular materials include rubber, stainless steel, PTFE, carbon, ceramic, Sic, and TC.

In SEALCON, equipped with advanced CNC processing equipment, you can not only buy the mechanical seals, but also buy the mechanical spare parts: sealing rings, spring, O-ring, sleeve and gland. All of our products conform to the standard of DIN24960, EN12756, ISO3069 API610, API682.

Mechanical seals form a critical part of any mechanical operation involving fluid movement through rotational shafts, such as in the case of pumps. These seals ensure that the fluid does not leak out of a closed system and contaminants do not enter the system. In pumping applications, mechanical seals are placed at the point of entry or exit of a rotating shaft, preventing the pressurized fluid from escaping the pump housing and withstanding the friction generated from the shaft rotations.

Mechanical seals are devices that accommodate a rotating shaft while containing and preventing the fluid from leaking out of the enclosed housing. While different mechanical seal designs are available for pumping applications, most have three sealing points.

These three sealing points ensure that the fluid contained within the pump housing does not leak while also preventing dust particles in the atmosphere from entering the housing.The mechanical seals are usually made up of different materials to prevent sticking. Typically, one side of the seal uses softer materials like carbon graphite, and the other is made of harder materials such as silicon carbide or ceramic alumina. However, hard materials are preferred for both surfaces if the pumping application involves abrasive fluids.

In addition to the two materials, the sealing unit also comes with O-rings to seal the stationary face on the housing side and the rotating face on the shaft side. Springs are also used to keep both faces pressed.

In most cases, the two faces of the seals are also lubricated to prevent friction and wear. Depending on the application, this fluid film can either be a separate lubricant or the process fluid itself.

Mechanical seals can be selected based on the type of pump application. Choosing the wrong seal can affect pump performance and lead to damage and costly repairs.An unbalanced mechanical seal is preferred if the pump needs to operate at a lower pressure. However, high pressure pumping applications require balanced mechanical seals. Balanced seals also perform better in high temperature operating conditions. Cartridge seals require less maintenance but are more expensive, hence used for limited applications.

At Hayes Pump, we have a fully staffed, factory-trained parts department to help you quickly with the correct mechanical seal for your pump. You canrequest a quotefor your part orcontact usto get further assistance.

Proper mechanical seal selection can lead to a better mechanical seal. The chemical resistance of all the wetted seal components must be looked at the three general materials the metal component, the secondary seal and the primary seal phases.

The metal component like spring, gland and sleeve holder must be investigated for the proper corrosion resistance because this is critical with thin metal parts such as metal bellow and springs.

The secondary mechanical seal will work well when the elastomer bellow works well and all it’s temperatures elastomer subject to too high a temperature will compression set or high harden leading seal failure chemical attack can cause an incorrectly selected elastomer to become stick or swollen and lose its physical properties.

Material selection is the mechanical seal face are the material acceptable in the concentrations and temperature of product that they seal for instance corban may be attacked by strong oxidizing chemical like nitric and sulfuric acid at certain concentration and temperature make sure the face material are constructed of pure unfild materials otherwise binder and fillers can be attacked as well.

Mechanical seals are designed to prevent leakage of fluid from centrifugal pumps that support industrial processes. Mechanical seals depend on mechanical seal support systems for reliable operations. The information below is provided to help explain mechanical seal support basics. It will help to gain a better understanding of mechanical seals and the various types of mechanical seal support systems, their applications, and optional configurations to help boost reliability.

A mechanical seal is used to contain fluid within a centrifugal pump where the impeller shaft passes through a stationary housing. There is a range of mechanical seal designs to cover every conceivable pumping process; low to high pressure, low to high fluid temperatures, clean plant water to heavy hydrocarbons. To cover that wide range of pumping processes and conditions there is an equally wide range of seal support systems and custom configurations to match the need.

With over 70 years of experience in fluid systems, we know about the day to day challenges our customers face. One of these challenges is to keep rotating equipment working reliably, and when maintenance is required to get it done as quickly as possible. To help meet these needs Swagelok has created a new range of Seal Support Products, System and Services aimed at extending the mean time between failure (MTBF) of your pump seals.

With our expert knowledge, huge range of components and our design capabilities, there is no solution we can’t provide to meet your needs. Whether you need a complete flush plan that connects straight into your process or a kit of parts for you to install yourself, we can create a bespoke solution for your needs instead of “one size fits all”.

We keep stock of the seal support system parts locally and they can be with you next day if needed, whether that be an extended male connector, or a kit of parts to build a flush plan.

We have a team of trained engineers and technicians ready to work with you to design, build and test your flush plan. You can rest assured that when you take delivery, it will work perfectly first time, in fact we are so confident of this we back up every Swagelok built Seal Support System with our Limited Lifetime Warranty. This peace of mind means you can focus on what you need to do to ensure your process is up and running as quickly as possible.

Swagelok seal support system designs avoid pipe threads and limit the number of connections wherever possible. Based on the fourth edition, the standard design for each plan includes the minimum arrangement of components as detailed in API 682:Pumps—Shaft Sealing Systems for Centrifugal and Rotary Pumps.

If you just want to order the components under one part number and build the flush plan yourself, you can just buy a Seal Plan Kit (SPK). Each kit contains everything needed for proper installation, including an engineered drawing and also adhere to API best practices by showing technicians where to bend tubing to eliminate potential leak points through the reduction of elbow fittings and pipe threads.

The rigors of the mining industry are legendary. This demanding environment takes a toll on your equipment requiring tough, durable products able to withstand the elements. Whether in surface or underground mining, Chesterton has proven, reliable solutions that enhance the performance and profitability of your equipment. Plus we have an impressive line of coatings to protect against abrasion and chemical attack.

Blackmer was incorporated in 1903 and is the leading manufacturer of positive displacement pumps, centrifugal pumps and compressors for the transfer of liquid and gas products. Blackmer is proud to provide innovative product transfer solutions for the following markets:

Chemical Processing, Soap & Detergents, Paint & Coatings, Liquid Terminals, Oil & Gas, Biodiesel, Refined Fuels, Liquified Gases, Diesel Exhaust Fluid (DEF), Truck & Transport, Liquid Terminals and Military & Marine.

Chesterton split seals are revolutionizing the way the commercial water industry looks at pump sealing. Taking pumps apart to replace seals is no longer required and many end-users are taking advantage of this new technology. Our wide array of packings and gaskets allow us to optimize the best sealing solution for your application and equipment. Chesterton NSF certified ARC® potable water coatings provide outstanding protection for expensive plant assets.

The rigors of the mining industry are legendary. This demanding environment takes a toll on your equipment requiring tough, durable products able to withstand the elements. Whether in surface or underground mining, Chesterton has proven, reliable solutions that enhance the performance and profitability of your equipment. Plus we have an impressive line of coatings to protect against abrasion and chemical attack.

We specialize in setting you up with complete sealing or maintenance programs that go beyond just selling you a product. Instead we help you create a solution that will truly save you time, money and headaches.

We have a wide variety of product that allow us to help you in a variety of areas in your process. We sell the full line of Chesterton Products: Mechanical Seals, Packing, Gasketing, Composite coatings, Cleaners, Degreasers Lubricants and more. We also sell all kinds of pumps for various application.

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The global mechanical seals market size stood at USD 3.20 billion in 2018 and is projected to reach USD 4.77 billion by 2026, exhibiting a CAGR of 5.2% during the forecast period.

The key utility of a mechanical seal is to prevent leakage of fluids or gases through the clearance between the shaft and the container. Mechanical seals consist of a set of 2 faces separated by carbon rings. The first face is in contact with the rotating equipment whereas the second face is stationary. Moreover, the main part of the seal is the seal ring (first face) on which the mechanical force is acting, generated by springs, bellows, or fluids in the equipment. In recent years, mechanical seals are playing an important role in varied industrial applications, enabling efficient operations. Mechanical seals are made up of several flexible materials such as Polytetrafluoroethylene (PTFE), Polyurethane (AU, EU), industrial rubber, Fluorosilicone (FVMQ), and many more.

The mechanical seal market has depicted significant growth in the recent span of years and is likely to grow in the forecasted period. Rising industrial development in emerging economies is expected to initiate additional development policies and investments. Major types of mechanical seals available in the market include cartridge seals, balanced and unbalanced seals, pusher and non-pusher, and conventional seals that are influencing the mechanical sealing market growth in developing countries.

Growth in machine tool industry is impelling the overall market share, owing to the usage of power machines in centrifugal pumps and compressors for sealing and separating the fluid in the rotating shafts. Hence, the increasing market demand for mechanical seals in various industries is anticipated to drive the market growth in the near future. Furthermore, the highest market growth is projected to be witnessed in Asia-Pacific, followed by North America.

According to the United Nations Conference on Trade and Development (UNCTAD), the global foreign direct investment (FDI) will grow vigorously in 2018. This implies that there will be strong growth in the manufacturing sector in the coming decade. Moreover, many countries are now adopting investment policies that will boost the manufacturing sector and drive the mechanical seals market trends. For instance, in 2017, several countries and economies adopted investment policy measures across the globe, of which 84% of countries were favorable to investors. This will allow investors to invest their funds in various industries, with primary focus on energy, transportation, and manufacturing.

Furthermore, many manufacturing and industrial studies are more focused on the production or supply side and less on the demand side. This practice has reduced the importance of the manufacturing sector over the last few decades. This situation can get balanced by placing the demand side at center in the manufacturing sector ecosystem.

Therefore, the demand for manufacturing is increasing with the changes in investment policies of multiple developed and developing countries. This growth will increase the adoption of machine tools and industrial equipment for the manufacturing process, which will directly boost the mechanical seals market growth, globally.

The global mechanical seals market is segmented by type, which is further segmented into pusher and non-pusher, conventional seals, balanced and unbalanced seals, and cartridge seals.

Continuous adoption of advanced sealing material in several industries is expected to grow the cartridge seals segment in the forecast period. The cartridge seals segment is estimated to have exponential market opportunities as they are designed as universal shaft seals for the seal chamber of pumps, containers, or pipelines.

The pusher and non-pusher seals segment depicts substantial growth, owing to the increasing usage of small and large diameter ring shaft in the light end services to handle high temperatures. The balanced and unbalanced mechanical seals segment is anticipated to grow moderately, owing to the rise in the industry sector worldwide. Balanced seals are preferred for most of the industrial applications as they generate less heat at the surface of the machine, enabling longer seal life and efficient sealing method.

Comparatively, the conventional seal segment is projected to witness progressive growth owing to the requirement of heat exchanger mating ring advances offered by these seals. The other segment consists of bellows seals and is likely to represent steady growth due to limited demand in the mechanical sealing market.

By industry, the market is bifurcated into metals and mining, food and beverage, oil and gas, energy and power, aerospace, marine, construction and manufacturing, and others (chemical, etc.).

Oil and gas industry is anticipated to grow exponentially at a higher growth rate owing to increasing demand of petroleum from developed and emerging countries, hence boosting the demand of mechanical seals. Energy utilization is growing worldwide and influencing the demand for electricity generation and consumption rate, thus leading to remarkable market growth. In the current scenario, 70% of the electricity is generated from the renewable sources such as wind and solar power, which bodes well for the mechanical seals market demand.

The construction and aerospace sectors are projected to depict significant market opportunities owing to the rising infrastructural developments as a result of increasing population and technological advancements in the aerospace operating and navigation systems.

Mechanical seals demand is increasing in the food and beverage and mining sectors due to increasing implementation of pumps, food tanks, and many other centrifugal machines to manage the intensity of fluid. Marine sector is expected to depict substantial market growth as the need for the mechanical seals at naval ships and ports will remain steady in the forecast period. The others segment consists of chemical industry and is likely to showcase steady growth, owing to minimum demand in the mechanical sealing market.

Asia-Pacific is anticipated to lead the mechanical seals market share and is projected to depict exponential growth over the forecast period due to the increasing industrial applications in the emerging countries including India and China. Along with that, strong economic growth in the manufacturing sector is expected to fuel the development of the market in the region. Furthermore, favorable regulatory framework and regulations by governments for increasing investment in the manufacturing industry is expected to have a substantial impact in the growth of the market. Additionally, rapid industrialization and increasing demand of mechanical seals from industries such as construction, marine, energy and power, and oil and gas is expected to boost the growth of the market. Moreover, the region has several small and medium mechanical seals manufacturers which will increase the market share of the Asia-Pacific region in the forecasted period.

North America is predicted to show a dynamic growth rate over the projected timeline due to the rising number of infrastructure and other development projects in the region, the mechanical seals market analysis points out. This growth in the region is attributed to the presence of key players in the market along with increasing demand for mechanical seals in several industries such as manufacturing, oil & gas, and other mining industries. The growth is owed to deep involvement of workers with technology research and development (R&D) and STEM (science, technology, engineering, and mathematics) in the industries such as energy & power, oil & gas, and aerospace. Furthermore, the demand for the sealing products is accounted for increasing presence of manufacturing industries such as automotive and aerospace to energy industries such as oil and gas extraction to high-tech services such as computer software and computer system design, including health applications.

Furthermore, Europe is witnessing rapid growth owing to rising presence of chemical manufacturing industries along with growing use of sealing products in aerospace, rail, and marine industries. Additionally, demand for sealing products is comparatively stable as the large range of industries in the market offers a relatively balanced market growth over the years. The stability in demand can be seen in the period 2020-2024. Countries such as Italy and Spain are expected to show substantial growth compared to other countries in the region owing to the demand from major industries such as oil & gas and food & beverage.

The mechanical sealing market value in the Middle East and Africa is growing due to presence of more than 65% of global oil refineries in the region. Increasing investment in the oil industry will result in increased demand for mechanical seals. Moreover, countries of the Middle East are shifting their focus from oil and gas production to other industries such as tourism and other manufacturing industries which will result in decreasing market value of mechanical seals.

The manufacturing sector has declined in Latin America over the past few years owing to the decline in the production of cars and other equipment. Moreover, in 2015, the manufacturing production index of Latin America had declined by 0.9%, according to MAPI Foundation. The construction and oil and energy sub-segments are expected to grow at higher rate, owing to the increasing population and demand for the adoption of natural resources. Governments of Brazil, Mexico, and Argentina are working continuously on investing in green energy projects, which in turn will boost the adoption of mechanical seals in several different industries.

SKF (SKF AB), John Crane (Smiths Group Plc.), and Flowserve Corporation are the leading market players. SKF holds the largest market share, as per the mechanical seals market report. This is a result of SKF’s market understanding, along with demand forecasting, which is growing with customer-specific value propositions, giving the company an uptime for designing and production of mechanical seals. This fits with company’s existing engineering skills and asset management approach, with strategic focus on new technology providing value for money and digitalizing of the entire value chain.

Flowserve shares five unconsolidated joint ventures located in Latin America, Middle East, and Asia-Pacific regions, mainly in Saudi Arabia, India, The United Arab Emirates, South Korea, and two in China. The company has a portion of the products manufactured, assembled, or serviced in the territories. The joint venture has provided different strategic opportunities, including increased access to the potential markets, along with access to added manufacturing capacity and development of an efficient platform.

Furthermore, John Crane announced that it completed its purchase of the Engineering Division of Advanced Diamond Technologies. The acquisition of ADT will result in enhanced reliability and performance of mechanical seals in key settings in pumps along with other industrial equipment, bringing significant benefits to customers. Also, these strategies offer an enhanced product portfolio to their clients with minimum timelines.

The research report offers an in-depth analysis of the mechanical seals market. It further provides details on the adoption of mechanical seals products across several regions. Information on trends, drivers, opportunities, threats, and restraints of the market can further help stakeholders to gain valuable insights into the market. The report offers a detailed competitive landscape by presenting information on key players, along with their strategies, in the market.

March 2019:John Crane announced its new T4111 cartridge seal. The seal, called the Elastomer Bellows Cartridge Seal, is single-use and is designed to seal rotary and centrifugal pumps, along with similar rotating shaft machines.

April 2019:Dover announced the latest Air Mizer solutions design for the AM Conveyor Equipment Manufacturers Association shaft seal, which is explicitly developed for CEMA equipment & screw conveyors.

March 2018: Hallite Seals continued its third-party authentication with Milwaukee School of Engineering (MSOE) for the reliability & integrity of the design of its seals & sealing materials.

May 2017: Flowserve Corporation declared that it had completed the deal which involves sale of the Gestra AG unit to Spirax-Sarco Engineering plc. This sale was the part of Flowserve strategic decision to optimize its product range, enabling it to emphasis more on its core business activities and allowing it to be more competitive.