The inner retaining ring increases the axial rigidity and resilience of the gasket. Its purpose is to help avoid excessive compression due to high seating stress in high-pressure service and to reduce turbulence in the flange area. The advantages to using an inner ring include the following: Provides additional compression stop and blowout resistance, prevents build up of process fluid, minimizes erosion and turbulence, shields the gasket, prevents buckling and promotes tightness. To view our line of Spiral Wound Gaskets, click here.
An O-ring is a precisely molded shape with a specific profile to fit into a specific channel or groove and are known for their ability to seal extremely high pressures.
Gaskets are by far the most versatile seal, with different shapes, materials, coatings, methods, etc. Depending on the type of material chosen, they can seal at a wide range of temperatures and pressures. Click here to view our line of gasket products.
Never scrape off old gaskets with a razor blade or anything that can scratch the metal surfaces and create a leak path. Doing so may compromise the seal and the operation of the assembly. But failure to clean off old gasket or gasket materials may result in the mating surfaces coming together in an uneven alignment. Instead, use a plastic scraper or nylon brush. Click here to view our CNA enhanced anti-stick gaskets.
Sounds like a simple question, but in fact, requires more than a simple answer.
It is not always realistic to repair or adjust the misalignment of flanges. So, if flanges are corroded, uneven or not parallel, a thicker gasket may be recommended because of their compression capabilities.
So why do most gasket manufacturers recommend using thinner gaskets wherever possible?
Thinner gaskets offer many advantages:
- Greater blow-out resistance and lower leakage rates due to the smaller cross-sectional area exposed to the internal medium pressure.
- Environmental concerns
- Better compressive strength and therefore higher gasket surface loads (pressure) can be safely applied to a thinner gasket.
- Better fastener torque retention due to the lower creep relaxation characteristics of thinner gaskets.
- Lower cost of the gasket itself.
Click here to view our line of gasket products.
“How long will my gasket last?” is a loaded question to which the practical and factual answer is… an Application Engineer’s nightmare!
A gasket may last 5 years, or it could last 20 years. Here is some insight into factors that will give your gasket the best chance at a long and prosperous life between the flanges. Read more here.
As a trusted gasket manufacturer, our recommendation is that you never reuse a gasket. For more information, view the video with the same title here.
Water Hammer is the generation and effect of high pressure shock waves (transients) in relatively incompressible fluids and is caused by the shock waves that are generated when a liquid is stopped abruptly in a pipe by an object such as a valve disc.
Symptoms include noise, vibration and hammering pipe sounds which can result in flange breakage, equipment damage, ruptured piping and damage to pipe supports. Whenever incompressible fluids exist in a piping system, the potential exists for water hammer.
The risks of water hammer developing are particularly high when:
- The velocity of the fluid is high
- There is a large mass of fluid moving and/or when there are large elevation changes within the piping systems
Since a swing check must rely on gravity and/or fluid flow to help it close, flow reversal must occur before closure begins. When a swing check finally closes, it abruptly stops the flow and causes a pressure surge resulting in shock waves. These shock waves continue until the energy generated from this sudden action dissipates.
High pressure shock waves created by the water hammer phenomenon act against the piping and the valve, exerting very high forces. This causes severe stress on the metal and vibrations in the system. If the system is not designed to withstand these high transient forces, the pipe could rupture and/or other components in the system, such as pumps and valves, could possibly be damaged. These problems can be eliminated or greatly minimized by installing a spring assisted silent check valve.
Silent check valves do not rely on gravity or fluid flow for their closure. Instead, as the forward velocity of the fluid slows, the spring assist on the valve starts to close the disc. Due to the spring assist and the relatively short distance the disc must travel, by the time the forward velocity has decreased to zero, the valve disc has reached the seat and the valve is closed. With reverse flow eliminated, the forces necessary to produce water hammer on both the upstream and downstream sides of the valves are substantially eliminated. View our line of check valves.
For a gasket to seal under installed conditions, a minimum stress value is necessary. This value should include the relaxation that will occur during the gasket’s installed life. To prevent damage, it also has a maximum stress value that should not be exceeded, its crush strength. When a gasket’s crush strength is exceeded, the properties that provide the seal break down. An optimized solution targets a stress level that is as high as possible above its minimum value but a comfortably safe margin below its maximum value and a value that may cause a problem to the bolts or flanges. View our gasket installation video to learn more.
The use of premium gasket materials with good seal ability numbers are the easiest ways to reduce emissions. Read more.
Achieving the proper gasket compression via the torque placed on the bolts is a well-engineered, tested and verified process based on the specific type of gasket material.
Sometimes the torque values aren’t followed, or a material gets replaced, and flange surfaces change throughout the repetitive heat cycles. When this happens, you must trust the performance of your gasket material. In some cases, over-compression can happen, and that can lead to problems. View our gasket installation video to learn more.
No. This is highly NOT recommended because it will most often create a leak path. See FAQ: What thickness is best for a gasket?
We recommend that gaskets be installed with only the factory-applied anti-stick formulation. Additionally, grease or paste type materials may deteriorate or dissolve in service, leaving a possible leak path across the gasket. Our anti-stick technology is applied to the surface during the manufacturing process allowing for improved separation from flange surfaces during removal, saving time and energy, and all without compromising the performance of the gasket.
Ring type gaskets have no bolt holes. These gaskets are positioned inside the flange bolts and around the pipe bore and are typically used on raised face flanges. When used on a raised face flange, the ring gasket is positioned on top of the raised surface of the flange. An advantage of ring gaskets is that they can be installed without having to fully disassemble the joint.
A full-face gasket covers the entire face of the flange. Full-face gaskets are typically used on flat face flanges and are cut with bolt holes which allow the insertion of the flange bolts through the gasket. When installing full-face gaskets, the joint must be completely disassembled. View our full product line now.