barrier fluid in mechanical seal made in china

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A double mechanical seal, also called dual mechanical seal, is designed for the maximum sealing safety. Such kind of mechanical seals virtually get rid of leakage of the mediums in the pumps or mixers.

Double seals provide a level of safety/zero emissions compliance not possible with single seals, which is essential when pumping or mixing a dangerous or toxic substance.

A properly installed double seal also allows for nearly complete control over the seal operating environment and fluid film over the seal faces. This factor alone can greatly maximize seal life.

Double mechanical seals have two sets of primary seals with a barrier or buffer fluid area in between. Each seal consists of a softer, narrower stationary face accompanied by a harder, wider rotating face. This arrangement enables the softer seal to wear while maintaining the integrity of the harder faced seal during service.

Provide an alternative when the process fluid will not provide stable and reliable lubrication of the seal faces (such as gaseous media, viscous fluids, non-settling slurries, or fluids liable to harden);

YALAN research and development center is located in city of Hefei, the captial of Anhui Province, China. It has 10 very experienced senior engineers working as a team for developing new mechanical seal solutions and provide technical support to the production factory of YALAN Seals.

The team has accomplished a total amount of over 3,600 models of mechanical seals and won 28 patents and invention. The search center of YALAN Seals is also named as one of the national high tech enterprises and provincial mechanical seal design and development technical center.

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.

Reduces friction and can increase efficiency in sliding mechanisms such as seal faces, with potential for lower steady-state operating temperatures and longer seal life

Mobil Synturion 6 has been developed for the demanding application of barrier/buffer fluid for mechanical seals. The greatest enemies of mechanical seals are excessive surface temperatures and the resulting formation of hard deposits that further increase heat and friction. These factors can shorten seal life, potentially leading to product contamination and costly equipment downtime. Synturion 6 is specifically formulated to prevent premature seal failure. Its excellent thermal stability, low internal friction and heat transfer properties protect against excessive heat buildup and seal surfaces. Additionally, its proprietary additive package is designed to resist degradation and the subsequent formation of deposits.

Thermal and Oxidation Stability: In laboratory testing, Synturion 6 demonstrated significantly superior oxidation life and corrosion protection when compared with leading competitive products. The exceptional stability of Synturion 6 is particularly advantageous where hot process fluids can stress the lubricant, ensuring reliable performance at sustained high operating temperatures. In field tests, Synturion 6 has shown excellent resistance to reactive and corrosive process components such as H2S and acids.

Mobil Synturion 6 is NSF H-1 registered for food machinery lubrication and meets the requirements of FDA regulation 21CFR 178.3570 "Lubricants for Incidental Contact with Food".

Double (or dual) mechanical seals are designed to ensure maximum sealing safety.These seals virtually eliminate leakage of the fluid or gas being handled in pumps or mixers.

Double seals provide a level of safety/zero emissions compliance not possible with single seals. This is essential when pumping or mixing a dangerous or toxic substance.

A properly installed double seal also allows for near complete control over the seal operating environment and fluid film over the seal faces. This factor alone can greatly maximize seal life.

A double mechanical seal has two primary seals with a barrier or buffer fluid area in between. Each primary seal typically consists of a softer, narrower stationary face accompanied by a harder, wider rotating face. This arrangement enables the softer seal to wear while maintaining the integrity of the harder faced seal during service.

Provide an alternative when the process fluid will not provide stable and reliable lubrication of the seal faces (such as gaseous media, viscous fluids, non-settling slurries, or fluids liable to harden)

To extend the life of any seal, you want to control the fluid film that comes into contact with the seal face. This establishes the ideal lubrication, temperature, and pressure. A dual seal allows you to control of all these factors.

Double seals require fluid exchange between the inboard and outboard seal faces. Each double seal must be installed with an environmental control/support system that introduces a barrier or buffer fluid in between the primary seals. This fluid is typically delivered from a tank to cool and lubricate the seal faces using a piping plan. The use of level and pressure meters on support tanks are crucial for both containment and safety.

The fluid can also be used to remove process and frictional heat. It can combats issues with cavitation and dry running. The correct fluid set-up can also effectively direct the hydraulic load to the inboard or outboard seal to meet operational needs and to increase the life of the seal.

A variety of possibilities exist for the Barrier or Buffer Fluid, but the key factor is compatibility with the sealed media. Liquids used fall into several categories:

There are no hard-and-fast rules for the right configuration. This is where your operation’s reliability/environmental goals come into play and where the experience of a seal manufacturer’s specialist can be invaluable.

The bottomline is that the double seal option is unmatched in terms of safety, leak/emission-free operation, and Life-Cycle Cost (LLC). Learn more about double seal set-up and operation in our upcoming posts.

... pressurized gas barrier metal bellows seal utilizing APGS non-contacting seal face technology. Welded metal bellows eliminate dynamic O-ring hang-up in a compact cartridge that fits ANSI ...

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... install;• Metal bellows provide better faces alignment;• Does not have dynamic gaskets;• Self-cleaning;• Adapts to API standard pumps;• Available with stationary or rotating bellows.

Burgmann H74-D Mechanical Seal called as PC04 are specialized in mechanical seals products. This device gives double seal and it can be rotated in any ...

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The MTM10-11 is a conical spring mechanical seal developed by Microtem. It is mainly used for general services machinery at low and medium pressure. This unbalanced mechanical seal ...

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The MTM 25_26, manufactured by MICROTEM, is a conical spring mechanical seal that can compensate positioning errors and withstand stresses created by vibrations. The contact surface can be made with silicon ...

... sealed tanks will have a mechanical seal of some sort. For many sanitary process vessels, the mixer must have some type of sealing barrier to provide either a dust tight vapor seal, a ...

mechanical seal for automotive engine cooling water pump, referred to as water seal, mainly composed of two parts: rotating ring and static ring. Static ring is installed ...

The 3-D Seal is designed to be the foremost solution for high radial misalignment and high run out applications. By combining Garlock’s proven P/S®-II and expansion joint technologies into ...

... harnesses the rotational energy of the pump shaft to vaporize the process fluid at a controlled rate, creating a stable gas film that lubricates the seal faces. Typical problems, such as dry-running wear, ...

The AESSEAL® API Type A, B and C single-seal range offers the user an unprecedented range of API engineered sealing solutions to suit all application ...

Mechnical seal type 5030 / 5031 »with rubber bellowssingle-actingnon-anisotropicAreas of usestandard pumpwaster water pumpsupply engineeringgeneral industrial usemass production ...

Balanced Bi-directional Built-in flushing connections External pressurization Fully split single seal, 2 x 2 segments, preassembled Installation and wear control Semi-cartridge Stationary springs

... displacement vane pumps that are manufactured by Hof Hydraulic. They are equipped with a cartridge kit design which permits easy repair and interchangeability between pumps.

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Sealing technology by EagleBurgmann is used worldwide in oil and gas industries, refineries, the petrochemical, chemical, and pharmaceutical industries, food processing, energy, water, mining, paper, aerospace, and other industries. Close to 5,800 employees provide their ideas, solutions, and commitment so that customers can rely on our sealing technology.

The GS 54 global standardized system is an optimized, pre-engineered design based on John Crane’s fluid control expertise and engineering excellence. The GS 54 is a best-practice solution that significantly reduces specification review and delivery schedules and delivers pressurized barrier system control for optimal mechanical seal performance and reliability.

Click on the Plan 54 piping plan animation below to see the pressurized external cooling system in operation, or click on the ‘normal operation’ or ‘failure mode’ buttons to change setup. You can use the controls to pause and reset the animation.

The GS 74 - Steam global standardized system is an optimized, pre-engineered design based on John Crane’s fluid control expertise and engineering excellence. The GS 74 - Steam is a best-practice solution that significantly reduces specification review and delivery schedules and delivers pressurized barrier steam for optimal mechanical seal performance and reliability.

The GS Plan 74 - Steam supports a dual pressurized non contacting gas seal by conditioning and controlling the continuous supply of pressurized dry steam. It features an upstream and downstream panel including a condensate separator, pressure regulator, check valve, steam traps, and instrumentation to monitor the pressure in the panel. This product performs a similar function to the Plan 74 piping plan as defined in API 682 4th Edition, modified to operate with steam as the barrier fluid instead of nitrogen or argon. The GS 74 - Steam is designed to support non-contacting mechanical seals meeting the specification of API 682 4th Edition.

Wenzhou Landmark Seal Manufactuing Co,.Ltd is established in 2011, Producing small standard mechanical seals with quantity more than 250000 pcs per month. Our advantage is small seals with all range of stamping and rubber moulds. The production is ISO 9001 , TUV , SGS, ROHS certificated.

Tegra Synthetic Barrier Fluid is designed to meet the needs of a barrier fluid for dual mechanical seals per API Standard 682, Shaft Sealing Systems for Centrifugal and Rotary Pumps. Dual mechanical seals are used to control emissions of volatile air pollutants from industrial equipment. Leading seal manufacturers recommend the use of low viscosity synthetic fluids for extended seal life of API Standard 682 dual mechanical seals.

Tegra Synthetic Barrier Fluid 17 cSt has a low Volatile Organic Compound (VOC) level, so that the barrier fluid itself will not be the source of volatile air pollutants in higher temperature applications.

A mechanical seal is any device that utilizes two ring type seal faces running against each other to create a barrier to the leaking product liquid. These two seal faces are ground and polished so smooth that they can run with a very small clearance between them, and even occasionally touch momentarily without damaging one another. The mechanical seal uses the product liquid to cool and lubricate the seal faces to keep them undamaged, with small amounts of vapor escaping across the faces. For liquids that are abrasive and non-lubricating, a “barrier fluid” may be required to protect the seal faces from the product.

The simplest mechanical seal consists of one “stationary face” that attaches to the exterior of the pump and does not rotate, and one “rotating face” that attaches to the spinning shaft. Each of these faces must attach to the pump via flexible “boots”, O-rings or other means to prevent liquid from leaking out around the seal faces. These boots are typically made of an elastomer such as rubber (BUNA), EPR or Viton, but the boots can be flexible metal bellows or even Teflon (although Teflon is difficult to install and keep compressed).

Metal parts are needed to keep the parts together and to provide springs to keep the faces together. These metal parts are usually 316SS but can be made from other more noble metals if needed.

A vast majority of centrifugal pumps will pump water in some varied condition, possibly in combination with an antifreeze and some antibacterial additives. Since water by itself is not a very good lubricant (especially at high temperatures) the seal faces need to provide some lubricity of their own so that when they touch at startup or shutdown, the faces will not tear themselves up. This is usually accomplished by making one of the seal faces out of carbon or by some material impregnated with carbon. The other seal face is usually a harder material that will resist wear from the carbon face, such as a ceramic, carbide or solid metal.

Note that although water is the most common liquid pumped, the different additives used can make a huge difference in the type of seal required. Relatively clean water, even when combined with glycol, is easy and inexpensive to seal, whereas dirty water or water with lots of additives can be very difficult. The difference is in the abrasiveness and lubricity of the liquid. If when you rub a sample between your fingers you can feel the lack of lubricity, or if your liquid has lots of salts or other dissolved solids, you may need a more complicated and expensive mechanical seal.

Water that is not abrasive and may have some glycol can use the least expensive type of seal. The stationary seal face is usually made of ceramic and is sealed to the seal plate with a Buna boot or a Buna O-ring. The rotating seal face is usually made of carbon/graphite in some combination and is sealed to the shaft (or shaft sleeve) with a Buna boot or O-ring. The spring and metal parts needed to hold the seal together are 304SS or 316SS.

Water with any salts, abrasives or additives are much harder on mechanical seal faces. When the mechanical seal is operating properly, small amounts of liquid are entering the space between the two faces. As the liquid travels from the high pressure side of the faces to the low pressure side, the liquid heats up and vaporizes. While this vaporization is needed to cool and lubricate the faces, it also leaves any salts or other solids in the space between the seal faces. These deposited solids are very abrasive and will accumulate over time and may quickly erode the faces (particularly the softer carbon face).

The simplest and cheapest solution for mildly abrasive liquids is to upgrade the seal faces to materials that can resist abrasives better than the inexpensive carbon/ceramic combination used for clean liquids. The least expensive harder material is usually silicon carbide, but other ceramic/metals are used. The downside of silicon carbide or any other hard material occurs when they run dry, even momentarily during startup and shutdown. Any period of dry running can cause wear and heat buildup and may cause the mechanical seal to fail. (In severe cases, the heat will melt the elastomeric parts). This dry running problem is significantly reduced when the silicon carbide faces are impregnated with carbon/graphite, but the problem is not eliminated. Depending on many variables, the seal with impregnated faces can only run dry for a short time before failing, but eventually the seal will fail from heat buildup.

Other solutions for sealing abrasive liquids include flushing the seal faces with a clean liquid, but this option requires special seals (such as a double seal) and special flushing piping. The cost of this option gets expensive fast and may require a much larger, more expensive pump and seal combination.

As water temperature gets lower than 32 F or higher than 212 F, the seal materials may need to be upgraded. Low temperatures usually need EPR elastomers to handle the cold, and higher temperatures may need Viton. Extreme temperatures may also require that the standard ceramic be replaced with the much tougher silicon carbide or other metal faces. Ceramic faces are very susceptible to thermal shock, and a sudden change in the temperature of the liquid can shatter the seal faces.

Mechanical seals for sanitary pumps or for use in food processing will usually require Viton elastomers and 316SS metal parts plus any other material upgrades needed for the liquid being pumped. These seals usually must be outside the pump where they can be disassembled and cleaned daily, so specialized pumps and seals are needed.

Liquids other than water may require very specialized mechanical seals, and even very specialized pumps. Toxic or flammable liquids will require double seals, special flushing liquids and special flushing plans to isolate the liquids and protect the seal faces. These special seals are often required for protecting workers, the public and the air quality. The size and complexity of these special seals requires large chambers and often large, complicated and expensive pumps. You may need to consult with your pump salesman or an experienced mechanical seal salesman to get the right pump and the right mechanical seal.

If your liquid is very hard to seal or very dangerous, you may want to consider a “sealless” pump. The three most common types of sealless pumps are: Mag Drive Pumps, Canned Rotor Pumps and Vertical Cantilever Pumps.

A Mag Drive Pump uses magnets to drive the pump in a contained shell. One set of Magnets spins on an outside cylinder attached to the motor. Another set of magnets spins on an inside cylinder attached to the pump. The two sets of magnets are separated by a thin non-metallic shell that keeps the pump liquid inside the shell. The problem with this arrangement is that there are lots of bushings and sleeves needed to support the pump shaft and the impeller. These bushings and sleeves are exposed to the pumped liquid, so any abrasives can kill the pump quickly. Repairing or replacing these bushings and sleeves is very difficult and very expensive, and only adds to the cost of an already expensive pump. This pump is very useful for clean but dangerous liquids.

A Canned Rotor Pumps goes one step farther than a Mag Drive Pump by enclosing the whole pump and motor inside a sealed shell. This eliminates the need for magnets to drive the pump and uses fewer bearings/bushings than the Mag Drive Pump. These bushings and sleeves are exposed to the pumped liquid, so any abrasives can kill the pump quickly. The repair and replacement of the bushings and sleeves is very expensive. This pump can be the best option for some hot and dangerous liquids.

A Vertical Cantilever Pump is usually the best option for water with lots of abrasives (such as parts washers). A motor is specially designed and built to have a very long and often very large diameter shaft that extends out (cantilevered) as long as is needed for the pump design. This long motor shaft is supported solely by the motor ball bearings (or by a large bearing housing) and these bearings are not exposed to the pumped liquid. A throttle bushing and sleeve are needed to reduce the amount of water escaping from the pump and these parts are exposed to the liquid, but the bushing and the sleeve should never touch and can be made from hard, erosion resistant materials. The disadvantage of this pump is that it is mounted vertically and must hang into a sump, so a lot of space and additional support structure is required. There are limits to the length these pumps can be made as the diameter of the shaft goes up exponentially as the length of the shaft increases. There is also some lost efficiency as some liquid must leak past the sleeve and bushing.