Help: Material of instrument gaskets in ammonia synthesis and acetylene plants
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I have a question for everyone: besides copper gaskets, what other types of gaskets are good for pad-type sealing? When measuring media containing ammonia and acetylene, copper must be avoided. But in many cases, the gauges use butt-welded stop valves, with installation materials such as Φ14 (Φ18)/1/2\" NPT terminal fittings; as long as gasket-type sealing is used, copper gaskets are employed inside ； What’s most confusing is that the gaskets commonly used on instruments and those used on pipes are of different sizes, so they cannot be used interchangeably. What kind of gasket would be a suitable substitute for a copper gasket? Especially in high-temperature and high-pressure environments.
Polytetrafluoroethylene gaskets cannot be used at temperatures above 350°C.
In addition to copper gaskets, aluminum or stainless steel gaskets can also be used for high temperature and high pressure applications
Acetylene and ammonia cannot use copper gaskets; PTFE gaskets or asbestos gaskets can be used for temperatures below 200 degrees, while aluminum gaskets or serrated gaskets are suitable for high temperatures and pressures.