Filter, sight glass TS certification
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Does anyone know whether filters and sight glasses now require TS certification?
Other combinations of component assembly devices
I remember not to use a filter; I can’t recall the source
It should be necessary, as they are all components that make up pipes. @ZhizheMing @RedLee_ZZHI @ylb913
The simplest way is to find filter manufacturers that have a TS manufacturing certificate. I remember that the filter couldn’t match any of the entries in the manufacturing permit rules, and the component assembly units only grant permits for wellhead devices and gas pressure regulating devices, so no manufacturing permit is required.