Petroleum Flange Gaskets

About Petroleum Flange Gaskets

Gaskets are an important part of flanges, valves and fittings as they help prevent water, oil and gas from leaking through them.Flange gaskets are divided into asbestos gaskets, rubber gaskets, graphite gaskets, and metal winding gaskets (basic type) are made of standard high-quality SS304, SS316 (“V” or “W”) metal strips and other alloy materials with graphite, asbestos , polytetrafluoroethylene, non-asbestos and other flexible materials are overlapped and spirally wound, and the metal strips are fixed at the beginning and end by spot welding. Its function is to place it between the two flanges to act as a seal.

Introduction Of Petroleum Flange Gaskets

To be precise, the flange connection should be a bolt, flange and gasket connection, and its sealing is achieved through the synergy of the three, and the gasket is the core component to achieve sealing. The principle of flange sealing is to generate sufficient pressure between the gasket and the flange sealing surface through the pre-tightening force of the bolts, so that the deformation of the gasket surface is enough to fill the microscopic unevenness of the flange sealing surface, so as to achieve the purpose of sealing.

PTFE wrapped gaskets for pipe flanges can be divided into three types according to the manufacturing method: cut type (S type), machined type (M type), and folded type (F type). For machined gaskets, the inner diameter of the envelope layer can be consistent with the inner diameter of the flange to prevent the fluid from eddy currents at the flange. As for the folded packing pad, it is made of strip-shaped polytetrafluoroethylene film with a thickness of 0.4-0.8mm, and the two ends are heat-sealed by heat-sealing method, and then wrapped on the outside of the ring-shaped core material to form a U shape, which is easy to manufacture. , suitable for larger flange seals.

Classification Of Petroleum Flange Gaskets

There are many kinds of flange gasket materials, common flange gaskets are: rubber gasket, PTFE gasket, metal wound gasket and so on.

Rubber flange gaskets are divided into: natural rubber gaskets, nitrile rubber gaskets, neoprene rubber gaskets, etc.

1. Natural rubber is suitable for media such as water, sea water, air, inert gas, alkali, and salt solution, but it is not resistant to mineral oil and non-polar solvents. The long-term use temperature does not exceed 90 ° C. It has excellent low-temperature performance and can be used in – Use above 60°C.

2. Nitrile rubber is suitable for petroleum products, such as petroleum, lubricating oil, fuel oil, etc. The long-term use temperature is 120°C, and it can withstand 150°C in hot oil, and the low temperature is -10~-20°C.

3. Chloroprene rubber is suitable for seawater, weak acid, weak alkali, and salt solution. It has excellent oxygen and ozone aging resistance. Its oil resistance is inferior to nitrile rubber and better than other general rubbers. The long-term use temperature is lower than 90 ℃, and the maximum use temperature is Not more than 130°C, and the low temperature is -30~-50°C.

Advantages Of Petroleum Flange Gaskets

1. Provide highly reliable sealing and insulation solutions for all critical working conditions.

2. Sealed and insulated in all pressure ranges of ANSI 2500 psi and API 15,000 psi.

3. It can withstand harsh working conditions including large bending moment, vibration, temperature and pressure cycle.

4. It can withstand the corrosive environment including high concentration of C02, H2S and generated water.

5. It has outstanding insulation performance for cathodic protection.

6. The dynamic pressure seal provides a reliable seal and eliminates leakage losses.

7. The size of the gasket matches the aperture of the flange to protect the flange surface from corrosion and erosion by the medium.

8. It can avoid turbulent flow at the flange connection.

9. Reduce galvanic corrosion of dissimilar metal flanges.