api mechanical seal made in china

We supply a wide range of products made of different materials, including rubber, stainless steel, PTFE, carbon, ceramic, Sic, TC, etc. Also, our sealing spare parts are easy to interchange and maintain.

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.

Mechanical seal is the most commonly used sealing device in rotating equipment. Its design is complex as well as many different types and arrangements are available for a very wide and varied selection of process specific applications.

Utilizing our well proven technology and vast industry related experience, we have provided optimum design and most suitable sealing solutions to original equipment manufacturers and end user customers in the refinery, petrochemical, coal chemical, crude oil pipeline, pulp and paper industries. Our excellent technical support and aftersales service keep installation time to the minimum and significantly reducing plant maintenance cost.

TSSC-FS05 Operating Limits : Pressure: 5.17MPa Speed: 23m/s Temperature: -40℃~+204℃ Rotary Ring (SiC/Carbon/TC) Stationary Ring (SiC/Carbon/TC) Secondary Seal (VITON/Encapsulated Ring/PTFE) Other ...

6 US GAL API682 Plan52 Plan53A Mechanical Seal Support System performs all basic function of a buffer/barrier system for the operation of double seals:

JY Mechanical seal (zhangjiagang )Co.,Ltd was established in 2006.With Jinyu trademark ,we Specialized in design and manufacturing repairing of Mechanical seals and selling high quality of sealing material silicon carbide, Tungsten carbide ,Tungsten Carbide,Alumina Ceramics carbon.

JY is constantly developing series of cartridge seals conforming to standard of ISO,ANSI,DIN and API ,which are widely used in industry such as Petrochemical ,electric power ,steel, pharmaceutical, paper &pulp, marine, ship yard and food processing Except for innovating on products research, engineers and technical well –trained by the company can customize various of mechanical seals as per requests, also can improve sealing performance on the working site and support maintaining solution.

Centrifugal pump is a combination of rotating parts (such as shaft, impeller, shaft sleeve, etc.) and stationary parts (such as pump shell, stuffing box, bearing box). Space or clearance needs to be left between the rotating part and the stationary part to avoid wear of mechanical parts. Through the clearance, the pressure fluid in the pump housing may leak to the surrounding atmospheric environment. Traditionally, gland ropes or packing are used to seal the gap. O-rings, gaskets / plates and airfoil seals are used to seal stationary parts, so these are called static seals. Labyrinth seals, lip seals and mechanical seals are used to seal the rotating shaft, so they are called dynamic seals. After World War II, the sealing rope was replaced by mechanical seal. Mechanical seals are also called face seals.

Mechanical seal is a key component in centrifugal pump. It prevents the leakage of pressure fluid by friction between moving ring and stationary ring with very smooth contact surface.

The above typical mechanical seal has five different sealing points (see Figure 2) to prevent the leakage of pressure fluid into the surrounding atmospheric environment.

The seal is located between the impeller, shaft and shaft sleeve, as shown in Figure 2, and the gasket is sealed. It prevents fluid from leaking through the gap between the shaft and the shaft sleeve (see Figure 3). It is the seal of the rotating impeller to the rotating shaft and shaft sleeve. There is no relative movement between parts during operation. The arrow in Figure 3 indicates the possible leakage path if the seal (gasket) fails.

The seal is located between the floating ring and the shaft sleeve, as shown in Figure 2, i.e. O-ring. It prevents fluid leakage through the gap between the floating ring (rotating part of the main seal) and the shaft sleeve, as shown in Figure 4. The seal rotates relative to the rotating part. During operation, the shaft sleeve and O-ring move relatively. The arrow in Figure 4 indicates the possible leakage path if the seal fails.

The rotating part and the stationary part are sealed by the rotation (mutual friction) of the floating ring relative to the stationary ring. Due to the spring force (the spring has a preload of 2 mm to 3 mm) and hydraulic load (the fluid pressure acting on the sealing surface), the floating ring and the stationary environmental protection remain in place. The seal rotates relative to the stationary part seal. The arrow in Figure 5 indicates the possible leakage path if the seal fails.

3) Adapt to the axial thermal expansion of the sealing ring. The heat generated by the contact between the sealing surfaces may lead to the thermal expansion of the sealing ring.

The seal is located between the stuffing box and the gland (gasket), which is a static seal. The arrow in Figure 6 indicates the possible leakage path if the sealing gasket fails

The seal is located between the stationary ring and the sealing gland, which is a static seal. The arrow in Figure 7 indicates the possible leakage path if the sealing gasket fails.

Mechanical seals became the dominant sealing technology in refineries and chemical plants in the 1980s, causing the American Petroleum Institute (API) to establish a committee whose sole focus was to write standards for these components. The first edition, API 682 Shaft Sealing Systems for Centrifugal and Rotary Pumps was published in 1994 with this mission statement, “This standard is designed to default to the equipment types most commonly supplied that have a high probability of meeting the objective of at least three years of uninterrupted service while complying with emissions regulations." (API Standard 682, First Edition, 1994 “Shaft Sealing Systems for Centrifugal and Rotary Pumps,” American Petroleum Institute, Washington, D.C.). Notably, the standard includes recommendations that unless otherwise specified, default to technology that has proven to be safe and reliable. Currently in its fourth edition, API 682 continues to offer guidance based on process service for both mechanical seals and their support systems.

While much of the standard is focused on mechanical seals, a significant portion is devoted to seal support systems, as they are a critical component to the proper functioning of the seal and pump system. As a manufacturer of seal support systems, Swagelok Company and our sales and service centers have implemented the best practices of API 682 4th Edition. In this blog post, we will explain what some of those best practices are, and how implementing recommendations from the standard in the construction and design of your seal support systems can help you meet your goals of increasing reliability and safety while reducing costs.

Before we discuss best practices, let’s look at the functions of seal support systems. These systems are designed for a specific mechanical seal and set of process conditions. Typically, they supply either a gas or a liquid to the mechanical seal to regulate the environment in which the seal operates, protecting rotating equipment from damage.

Throughout API 682 4th Edition, there are references to reducing the number of connections in seal support systems. Whether welded pipe or tubing is selected for the system, threaded systems are discouraged. Every connection can be viewed as a potential leak point and possible reliability risk in hydrocarbon pumping applications. Leaks on seal support systems near pumps can cause asset damage, increased downtime, environmental issues, and safety risks.

In the past, many seal support systems were constructed out of pipe due to piping being historically preferred. More recently, seal manufacturers, end users, and pump OEMS have implemented tubing as a connection solution in seal support systems due to its long history of successful use in critical applications throughout the industrial world. As rotating equipment expert Heinz Bloch noted in a recent Hydrocarbon Processing article, “[the] American Petroleum Institute Standard 682 (API 682) began to endorse the use of tubing for some seal piping plans. Regrettably, tradition-bound purchasers still opt for hard pipe; we are asking them to reconsider. API 682 (4th Edition) now specifies seal support system connections almost interchangeably.” (Bloch, Heinz P., Consider Stainless Steel Tubing for Mechanical Seal Connections, Hydrocarbon Processing, March, 2018)

Tubing can be utilized to reduce the number of connections by bending lines and appropriately using adapter fittings. Often, the only needed connections are those at the seal and the sealing system. Since tubing is annealed, bending the tubing work hardens the metal, increasing the strength of the tube at the bend. Innovative connection technologies such as flange adapters and extended male connectors further reduce the number of connections from threaded ports on the seal and seal pots by eliminating the need for multiple fittings. The use of tubing provides further financial benefit when we examine the MRO costs of the pump, seal, and support system. During maintenance operations where “piping” around pumps is reworked, the use of tubing eliminates the need for costly on-site welding and can be installed quickly to reduce downtime.

Seal support systems are critical to the proper operation of the seal and pump, and as such, require regular visual inspection. Making the job of visual inspection simple promotes system reliability and safety. When designing seal support systems, there are several best practice design principles to consider once the piping plan and general arrangement have been selected.

Mechanical seals are often damaged when pumps are started and stopped, sometimes as the result of improper seal support system operation. If the design of the seal support system facilitates proper operation, common mistakes when commissioning pumps can be avoided.

In API 682 4th Edition, a Plan 32 is shown as multiple instruments and components installed on either piping or tubing. While functionally correct, this design provides the operator little information regarding the operation of the system, what information is important, and why it is important. If the system is located down next to the seal on a pump, the operator now needs to walk back to the pump and bend down to read instrument information. Creating even small obstacles for operators increases the risk that trouble signals will be missed and reduces reliability. An intuitive solution is to arrange these components on a panel.

Additionally, API 682 supports these design considerations. It states: “All controls and instruments shall be located and arranged to permit easy visibility by the operators, as well as accessibility for tests, adjustments, and maintenance” (9.1.5) (API Standard 682, Fourth Edition, 2014 “Shaft Sealing Systems for Centrifugal and Rotary Pumps,” American Petroleum Institute, Washington, D.C)

Lastly, panels can include part numbering information, flow path indication, and operator instructions. These improvements help ensure safe and reliable startup and shutdown of pumps and seal support systems.

While correct operation of the seal support system is a high priority, consideration should also be given to designing systems that are easy to maintain. Seal support systems contain commonly serviced items such as flow meters, strainers, and other visual instruments. Preventative maintenance (PM) on these systems should be simple and safe for operators. If strainers are not conveniently positioned and available for blowdown, it is unlikely that proper PM will be performed at recommended intervals.

API 682 4th Edition also recommends block-bleed configurations for all gauges. If systems are not designed with this feature, it is likely that as gauges fail, operators will be left without critical information until the next turnaround or project when the pump and support system can be decommissioned and the gauge replaced.

Lastly, there are a wide variety of tubing connections and design options that allow for every serviceable component on a seal support system to be easily removed and replaced while continuing to operate the system. For seal pots, the 4th Edition stipulates “Local operation, venting, filling, and draining shall be accomplished from grade. Unless otherwise specified, systems that require the use of a ladder or step or that require climbing on the baseplate or piping are not acceptable” (8.1.8) (API Standard 682, Fourth Edition, 2014 “Shaft Sealing Systems for Centrifugal and Rotary Pumps,” American Petroleum Institute, Washington, D.C.). Many plants have older seal pots with just a pipe plug at the top. Having operators climb a ladder to top-off the pot can expose them to process vapors and is a generally unsafe practice. Designing Plan 52s or Plan 53s with fill systems such as the one shown below is a simple design consideration and best practice that promotes safe maintenance.

Implementing these basic best practice design principles for mechanical seal support system increases reliability and reduces costs. To recap how you can realize better results with your systems:Consider using tubing instead of welded pipe to reduce installation and maintenance costs. This will also promote reliability through the reduction of potential leak points.

Bringing pumps offline to fix minor instrumentation issues or fill seal pots should not be acceptable. Locating these systems on panels, with proper labeling and designing for easy maintenance reduces the chance for operator error which can damage seals.

Seal failures and the associated costs of seal replacement should be of great concern to rotating equipment groups at all plants. Ensuring that the best practices and design principals of API 682 4th Edition are followed helps prevent these costs and creates a safer and more reliable operation.

Swagelok provides design and assembly of seal support systems through our network of more than 200 authorized sales and service centers. We offer configurable, local, and reliable systems that are better by design to help you reduce costs, save time, and improve safety of your rotating equipment. For additional advice on designing and installing your mechanical seal support systems, or to find the right API seal plan kits or assemblies for your applications, reach out to your local Swagelok team.

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