Spiral wound gasket is a type of semimetallic gasket, rationally designed to provide a high performance in use at high temperature and pressure.
It is equipped with an ample compressibility and an increased demand has been seen in these years because of the merit that a gasket seating stress can be controlled by an optimum compression thickness.
It is widelyused at process line and lines handling heating medium in oil refineries and petrochemical plants as well as steam processing lines in thermal power stations, atomic power stations and vessels of steam turbined engines. It is made of V,W preformed thin metal strip and a selected filler material which are tightly and spirally wound together with only metal strip wound in several folds and spot-welded at the beginning and the end of winding.
Fetures
- No skill is required when installing the gasket because a perfect sealing can be assured only by stressing it to a certain seating thickness(example:original 4.5mm thick gasket may be compressed to 3.2~3.4mm)
- It withstands constant high temperature and high pressure and stable sealability can be assured even if the operating conditions should suddenly be changed. It would not be broken nor cause leakage even if it should receive heat and pressure cycles or thermal stress
- No leakage has been experienced even at very low temperature
- It can be used not only on piping flanges but also on joints of various machinery and equipments by changing material of metal winding and filler or adding centering device and ribs.
- Machinery cost can be minimized by using the gasket because it does not require fine surface finish of flange (250 AARH is acceptable).
- It does not stick to flange faces and cleaning or exchange of gasket is quite easy.
- Good sealing performance
- The long life expectancy
Specification
According to the ANSI, ASME, API, DIN, BS, JPI, JIS, KS etc.
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