One of the best all-around seals, the spiral wound gasket offers a low-cost solution that has the ability to handle temperature and pressure fluctuations. Multiple plies of metal and filler in the spiral create a barrier that reduces the possibility of leaks.
Heat Exchanger Gaskets
Garlock manufactures a wide variety of double-jacketed, spiral-wound, metal-clad and solid metal gaskets for heat exchanger applications. GRAPHONIC® and Kammprofile gaskets are also available in heat exchanger configurations.
Temperature and Chemical Considerations
Be certain that the gasket you order is as resistant as possible to the media and temperature involved. Check the chemical compatibility of the metal as well as the filler material for the media to be sealed. As a general rule, the metal used in either the spiral winding or double-jacketed gasket should be similar to the flange material.
The compressibility of flexible graphite makes it an excellent filler material for metallic gaskets. Flexible graphite may be used in services with temperatures up to 950ºF (485ºC), though it should not be used with strong oxidizers such as nitric or sulfuric acid.
PTFE filler material provides excellent chemical resistance at temperatures below 500ºF (260ºC). In accordance with ASME B16.20, an inner ring is required when using conventional PTFE filler materials, in order to protect the winding from radial buckling.
Temperature Limits for Common Metals
Row color indicates guide ring color. Due to browser color display differences, you may wish to consult our
|304 Stainless Steel||-320||-195||1400||760||304|
|316L Stainless Steel||-150||-100||1400||760||316L|
|317L Stainless Steel||-150||-100||1400||760||317L|
|321 Stainless Steel||-320||-195||1400||760||321|
|347 Stainless Steel||-320||-195||1700||925||347|
|20Cb-3 (Alloy 20)||-300||-185||1400||760||A-20|
|HASTELLOY® B 2||-300||-185||2000||1090||HAST B|
|HASTELLOY® C 276||-300||-185||2000||1090||HAST C|
|INCOLOY® 800||-150||-100||1600||870||IN 800|
|INCONEL® 600||-150||-100||2000||1090||INC 600|
Changes in spiral winding construction affects gasket density. Higher pressure applications require windings with more wraps of thinner filler material. This construction withstands higher bolt loads, and provides a better seal against high pressures. A lower pressure gasket has fewer wraps of metal and filler, allowing the gasket to seat under lower bolt loads.
Gasket Selection by Flange Type