Custom Industrial Gaskets Supplier From China

  • Many Years Industry Experience, Professional Technology Support

  • Skilled at Custom Special Type Gaskets and Alloy Metal Ring Type Joint

  • Production Capacity: around 24000 pcs variety sealing gaskets per month (also depends on gasket type)

  • Advanced Production Capacity and Inventories Ensure to Provide The Fastest Delivery.

  • Lone-term sealing industry production and sales experience, we provide mature technology consult

Corrugated Metal Gasket ASME B16.20

Corrugated Metal Gaskets


The corrugated metal gaskets can be direct replacements for spiral wound gaskets. It can eliminate inward buckling issues while creating a seal at moderate flange stresses. Corrugated metal is covered with graphite, ceramic, or PTFE layer. An additional finishing layer is applied depending on the requirements of the medium to be sealed. The gaskets with a soft layer on both sides are used in low-pressure applications in large diameter flue gas ducts at high temperatures

Double Graphite Metal Jacketed Gasket for seals and heat exchanger

Double Jacketed Gasket


Double Jacketed Gasket is made from graphite, ceramic, non-asbestos, etc filler covered with a thin metal jacket, such as SUS304, SUS316, Carbon steel, copper, soft iron, etc. With excellent sealing performance, it can be used in sealing spots of pressure vessels, exchanger heat, condenser, plain hole, etc.

Metal Sealing Kammprofile gasket with loose outer ring

Kammprofile Gasket


Kammprofile gasket consists of a concentrically serrated solid metal core with a soft conformable sealing layer bonded to each face. The layer can be expanded graphite, PTFE, asbestos-free gasket sheeting material or some soft metal. It features excellent compressibility and good recovery characteristics. The gasket is mainly suited for vacuum and extremely high-pressure applications. It can be refurbished and reused and has better leak tightness than spiral wound gaskets.

ring joint gaskets for pipe sealing

Ring Joint Gasket


Ring Joint Gaskets are machined from a variety of types of forged solid metal such as Soft iron, ANSI304, ANSI316, F5, Low carbon, and special materials of alloy metals, Inconel Duplex, Monel, Hastelloy, Titanium, etc. They are designed for high pressure and temperature applications by selecting the suitable shape and material. The hardness of the RTJ gasket body should always be 20-30HB less than the hardness of the flanges to prevent flange deformation.

spiral wound gasket with outer inner ring

Spiral Wound Gasket


Spiral Wound Gasket (GS001) consists of the thin metal hoop and non-metallic filler material that is simultaneously wound. The metal hoop is pre-formed in V or W shaped profile, which allows the gasket to act as a spring between the flanges. Spiral Wound Gaskets are extremely popular due to the wide variety of available styles and sizes, it is the precision-engineered solution for flange joints, manholes, and other high-temperature, high-pressure applications. We can produce according to ASME, BS, JIS, and EN(DIN) standards or client requests.

Industrial Gaskets Manufacturers FAQ

We have our own production bases specialized in producing Expanded PTFE Products. Meanwhile, we sourcing & supplying all range of  Sealing Products.

LongSeal PTFE Products have FDA, ROHS and other certifications approved by TUV, SGS, and BV, the RTJ Gaskets have API 6A certificate. All other products meet or exceed quality standards and quality control procedures conform to the strict requirements of the industry standards.

Based on our many years of sealing industry experience and professionalism, our prices are more favorable in the same quality grade. Welcome you to compare prices with other suppliers.

For regular products, it will be 6-8 working days; For customization products, leading time depends on our production line

Yes, samples are available free of charge. but we don’t bear the express cost.

Yes, we accept the third-party inspection as your requirement.

You have 14 calendar days to return the product with the quality problem from the date you received it.

We are always looking for motivated distributor partners! If you are interested, please contact us by mail at info@nbseals.com or complete a request form on this site with your contact information.

Request Your Free Industrial Gaskets Solution Quote Today

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Industrial Gasket FAQ Guide

Bandak Sealing is a professional Industrial Gaskets supplier in China, which has specialized in manufacturing, designing, and distributing industrial sealing&gaskets products for 20+ years. With 2 production bases, we can support you to design the entire sealing solution and provide a one-stop sourcing service according to your requirements. Here we summarized the industrial gasket guide:

1. What is a industrial gasket?

An industrial gasket is a mechanical seal that fills the space between two or more mating surfaces, usually to prevent leakage or entry from connected objects during compression. Washers allow “imperfect” mating surfaces of machine parts, and they can fill in irregularities. The gasket is usually cut from a thin sheet of material. Gaskets for special applications, such as high-pressure steam systems, may contain asbestos. However, due to the health hazards associated with asbestos contact, non-asbestos gasket materials are used in actual use.

Normally, the industrial gasket is made of a certain degree of yielding material so that it can deform and tightly fill the space it was designed for, including any slight irregularities. Some gaskets need to be directly coated with sealant on the surface of the gasket to work properly.

Some (pipe) gaskets are completely made of metal, relying on the surface of the valve seat to achieve sealing; use the spring characteristics of the metal itself (reach but not exceed σy, the yield strength of the material). This is some typical “ring joint” (RTJ) or some other metal gasket system. These connectors are called R-con and E-con compression-type connectors.

2. Features of Industrial Gasket

Industrial gaskets are usually made of flat materials, sheets such as paper, rubber, silicone, metal, cork, felt, neoprene, nitrile rubber, glass fiber, polytetrafluoroethylene (or PTFE or Teflon), or plastic polymers (such as Polychlorotrifluoroethylene) made.

In industrial applications, one of the more ideal properties of effective pads of compressed fiber pad materials is the ability to withstand high compressive loads. Bolts with compression ranges of 14 MPa (2000 psi) or higher are commonly used in industrial gasket applications.

Generally speaking, there are several self-explanatory principles that allow for better gasket performance. One of the repeated trials and tests is: “The more compressive load applied to the gasket, the longer it will last.” There are several methods to measure the ability of gasket materials to withstand compressive loads.

One of the most frequently used tests is the “hot compression test”. Results of these tests will usually be provided or published by most industrial gasket materials manufacturers.

3. Types of Industrial Gaskets

According to industrial use, budget, chemical contact, and physical parameters, there are many different designs of gaskets:

1) Sheet Gaskets

When a piece of material has a “punch hole” in the shape of a gasket, it is a piece of the gasket. This can result in a rough, fast, and cheap gasket. Compressed asbestos was used in the past, but now fiber materials such as graphite are used. Depending on the chemical inertness of the materials, these gaskets can meet various chemical requirements.

Non-asbestos gaskets are durable, have a variety of materials, and thick in nature. Examples of materials are mineral, carbon, or nitrile synthetic rubber. Applications using sheet gaskets involve acids, corrosive chemicals, steam, or mildly corrosive agents. Flexible and good recovery to prevent breakage when installing the industrial gasket.

Sheet gaskets

2) Solid Material Gaskets

The idea behind solid materials is to use metal, which cannot be stamped from a thin plate, but the production cost is still low. Generally, these gaskets are more durable and have higher levels of quality control than thin plate gaskets. The key disadvantage is that in order to be flush with the flange head and prevent leakage, the solid metal must be greatly compressed. The selection of materials is more difficult; due to the main use of metals, process contamination and oxidation are risky.

Another disadvantage is that the metal used must be softer than the flange to ensure that the flange does not warp and thus prevents sealing with future gaskets. Even so, these gaskets have found a niche in the industry.

3) Spiral Wound Gaskets

Spiral wound gaskets are made of a mixture of metal and filler materials. As with the filler material (usually flexible graphite), the gasket usually has metal (usually carbon-rich or stainless steel) wound in a spiral (other shapes are possible) starting from the opposite end as the gasket. This leads to the alternation of filler and metal layers. The filler material in these gaskets acts as a sealing element, and the metal provides structural support.

These washers have proven to be reliable in most applications, allowing lower clamping forces than solid washers, albeit at a higher cost. (See the spiral wound gasket below for details)

4) Constant Seat Stress GasketS

The constant stress gasket is composed of two parts; a solid carrier ring made of a suitable material (such as stainless steel), and two compressible material sealing elements installed in two opposite channels, one of which is located on the two sides of the carrier ring. side. Sealing elements are usually made of materials suitable for process fluids and applications (expanded graphite, expanded polytetrafluoroethylene (PTFE), vermiculite, etc.).

The name of the constant seat stress washer comes from the fact that the carrier ring profile considers flange rotation (deflection under bolt pretension). For all other conventional gaskets, when the flange fastener is tightened, the flange deflects radially under load, resulting in the greatest gasket compression and the highest gasket stress at the outer edge of the gasket.

Since the gasket is used for constant seat pressure, the gasket is created by considering this deflection. For a given flange size, pressure class, and material, the gasket profile can be adjusted so that the gasket sealing pressure is radially uniform throughout the sealing area.

Further, because the sealing flange surface element is completely closed against the channel gasket, any in-service compressive force on the gasket is transmitted through the carrier ring, avoiding any further compression of the sealing element, thereby maintaining the “constant” cushion seat pressure during in-service. Therefore, the gasket is not affected by common gasket failure modes, including creep relaxation, high system vibration, or system thermal cycling.

The basic concept of improving the sealing performance of a constant seat stress gasket is: (i) if the flange sealing surface can achieve sealing, (ii) the sealing element is compatible with the process fluid and the application, and (iii) achieve sufficient gasket seat during installation Stress, thereby affecting the seal, and then the possibility of industrial gasket leakage during use is greatly reduced or completely eliminated.

5) Double-Jacketed Gaskets

Double-jacketed gasket is another combination of packing material and metal material. In this application, the tube with an end similar to “C” is made of metal, and the other piece is made to fit the inside of the “C” so that the tube is thickest at the meeting point. The packing is pumped between the housing and the components.

In use, the compression gasket has a large amount of metal at the two tips in contact (due to the shell/sheet interaction), and these two places bear the burden of the sealing process. Since only a piece and housing are required, the gaskets can be made from a variety of materials, can be made thin, and can be filled with various materials.

6) Kammprofile Gaskets

Kamprofile gaskets are used in many older seals because of their flexible nature and reliable performance. Cam profiles work with a solid corrugated core and a flexible cover layer. By arranging the gasket in this manner, a very high compression can be achieved along the ridge. Since generally graphite will fail instead of the metal core, kamprofile can be repaired during later periods of inactivity. Kamprofile has a high capital cost in most applications, but it has a long service life and high reliability.

7) Flange Gaskets

A flange gasket is a type of gasket suitable for two-section flared pipes to provide a higher surface area. Flange gaskets come in various sizes and are classified according to the inner diameter and outer diameter.

There are many standards for gaskets for pipe flanges. Flange gaskets can be divided into four categories:

  • Plate gasket
  • Corrugated metal gasket
  • Ring gasket
  • Metal spiral wound gasket

8) Ring Joint Gaskets

The ring joint gasket is also called RTJ. They are mainly used in offshore oil and gas pipelines and are designed to work under extremely high pressures&high temperatures. They are solid metal rings with different cross-sections, such as the oval, and octagonal. Meanwhile, they have other types such as RX ring joint gasket, BX ring joint gasket, and more Non-standard ring joint gaskets could be manufactured according to customized requirements.

4. Improvement for Industrial Gaskets

Several minor alterations are made to sealing gaskets in order to achieve or infer acceptable performance conditions:

  • A common improvement is the built-in compression ring: A compression ring allows higher flange compression while preventing gasket failure. The impact of the compression ring is minimal and is usually only used when the standard design has a high failure rate.
  • A common improvement is the outer guide ring: The guide ring is easy to install and can be used as a secondary compression inhibitor. In some alkylation applications, these can be modified on the double-jacketed gasket to show when the first seal passes through the lining system and the alkylation paint fails.

5. How to Install the Industrial Gasket?

The Fluid Sealing Association (FSA) and the European Sealing Association (ESA) jointly created an industrial gasket installation procedure manual (available in 9 languages ​​on the FSA and ESA websites, fluidsealing.com, europeansealing.com) to help installers pay attention to the key point for proper gasket installation. The following is a summary of the six main focus areas, in order.

Before any installation begins, it is important to follow all company safety procedures and policies to ensure that the system is decompressed, drained, and disconnected (locking and…procedures) and have all necessary personal protective equipment (PPE) and tools to help the work Smooth and as safe as possible.

The equipment should include at least:

  • Calibrate torque wrenches or other fastening devices
  • Wire brush
  • helmet
  • Safety goggles and/or face shield
  • Lubricant

Equipment designated by other factories

Step 1: Cleaning and Inspection

Once the industrial gasket is removed from the flange, remove any foreign material or sealing gasket fragments from the sealing surface. If material is embedded on the sealing surface or within the flange serrations, use a wire brush to remove it. Use abrasive materials such as grinders, hammers, and chisels to avoid further damaging the flange sealing surface.

Check the sealing surface for dents, dents, sparks, or pits that may cause sealing problems. If there is any obvious damage to the flange surface, you can refer to ASME PCC-1 Appendix d-Guidelines for the Flatness and Defect Depth of Allowable Gasket Contact Surfaces to determine whether the flange needs to be repaired. Check fasteners such as bolts, washers, and nuts for defects, cracks, and burrs. If it is determined that the fastener assembly is defective, discard and replace it. Inspection tips: When installing bolts and nuts, make sure that the nuts rotate freely on the threads to ensure that the threads are not damaged.

Step 2. Make Flange

In order to form an effective seal, the installer must ensure that the flanges are parallel when connected together. This provides the best opportunity to apply a uniform maximum gasket load, creating the best seal. ASME PCC-1-2013 appendix e flange connection guide gives the following recommended allowable limits:

  • Flange parallelism
  • Centerline high/low (alignment of flange hole inner diameter (ID) or flange outer diameter (OD))
  • Rotation-double holes (rotate to align the bolt holes, so that the fasteners do not need to be inserted)

When connecting the two flanges together, consult an engineer if it takes more force than usual. Don’t try to over-tighten the bolts, hope to connect the flanges together.

Alignment tips:

Avoid using a crowbar or screwdriver to align the flange. Appropriate tools can help linear and rotational alignment, making it safer and easier to use.

Step 3. Install the Sealing Gasket

Before installation, check the industrial gasket to make sure it has no defects and it is clean-cut without tearing or tearing.

Carefully insert the gasket between the flanges, making sure that the gasket is centered between the flanges. In difficult or horizontal installation situations, never use release agents or connecting compounds on the gasket sealing surface. Doing so causes two main problems:

  1. The joint is now lubricated, making it easier for the gasket to squeeze from the flange due to internal pressure and hydrostatic end forces acting on the joint.
  2. This material will chemically corrode the industrial gasket and affect the performance and service life of the gasket.

Installation tips:

For full-scale industrial gaskets, inserting 2 to 3 bolts through the flange and gasket will help locate the gasket and prevent it from moving when connecting the flanges together, reducing the risk of squeezing or damaging the sealing gasket.

Step 4. Lubricate the bearing surface

Lubrication or anti-seize is a key step in any sealing gasket installation. It facilitates assembly and also facilitates disassembly in the case of anti-seize. When choosing a suitable lubricating or anti-sticking paste, it is important to consider factors such as temperature, particle type, and size.

If a high-quality lubricant/anti-seize agent with a consistent K factor is not used, tightening the bolt to the torque value recommended by the manufacturer will not actually transmit the required pulling force. The application of lubricant is very important. The installer must ensure that the lubricant is evenly applied to all threads, nuts and

The bearing surface of the industrial gasket. The installer should also make sure that they are not lubricating or preventing seizures on the gasket or sealing surface. See step 3 for more information.

Lubrication tips:

Don’t know how much lubrication is enough? If you can’t see its effect on the fasteners less than five feet away, then it may not be enough.

Step 5. Installation and tightening of bolts

Before tightening the nut, consult the washer manufacturer for the recommended torque value. It is important to ensure that the bolt stress generated by the recommended torque is within the allowable range of the bolt material. Otherwise, a malfunction may occur. When tightening the nut, it is important that the installer try to connect the flanges together in parallel.

The best way to achieve this is to always use the traditional method or Phillips bolt pattern to tighten the nut, and use multiple (3 to 4) tightening wheels during installation. During the tightening process, using a gap measuring tool or a vernier caliper to measure the distance between the flanges is a good way to ensure that the flanges are parallel during the tightening process. In the case where the gap measurement is not similar, it may be necessary to reduce the bolt torque or loosen the nut at the appropriate position until the flange gap measurement is uniform.

Strengthen:

  • Tighten all nuts by hand, but do not exceed 20% of the recommended torque.
  • Round 1: Adjust the torque of each nut to approximately 30% of the recommended torque.
  • Round 2: Increase the torque of each nut to approximately 60%.
  • Round 3: Torque approximately 100% of the full torque for each nut.
  • Round 4: Apply at least one final full torque to all nuts in a clockwise direction until all nuts have a uniform torque.

Tightening tips:

It’s a good idea to number the bolts in the order of tightening so you can do it easily Follow them to tighten the wheel many times. This is especially important for large diameter flanges with many bolts. There is ample evidence that due to sealing gasket creep and bolt and flange slack, the slack of the bolted flange assembly occurs within 4 to 24 hours after the initial installation.

It is strongly recommended that the user re-adjust the torque within a 4-24 hour window when the system is still at ambient temperature and atmospheric pressure before going online again. In some cases, this simply cannot be done, and the system must resume online service immediately after reinstalling the industrial gasket. In this case, it is recommended to use the maximum allowable torque to help prevent joint laxity.

It is not recommended at any time to perform distillation after the rubber-based soft industrial gasket material is exposed to high temperature (called thermal torque). The use of elastomer-based materials can cause gaskets to crack, which can cause blowouts and serious injuries.

Re-fixing tips:

When re-tightening within an appropriate time of 4-24 hours, starting from the 3rd round mentioned in step 5, adjust the torque of each nut to approximately 100% of the full torque, and then rotate it at the final full torque. Wheel to ensure that all nuts are evenly torqued. Bolted flange assemblies have the best chance of staying leak-free if you focus on these six main areas. A reliable and effective seal can be created this way.

These procedures apply to standard flanges. Some special equipment may require special steps. In any case, the safety procedures must be strictly followed.

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