In practice of TOTAL(Franch) company explained that butterfly valve is commonly used in low pressure gas lines,but not indicated which pressure is defined as low pressure.if everyone have any experience,pls share here.

also,I have a gas stream which the pressure in upstream and downstream of butterfly is 71.5 bara and 71.2 bara,please let me know this is applicable to use butterfly valve as control in system or no?

gas flowrate is 230 MMSCFD
temperature is 54.2 oC
and gas is H2S free
pipe size is 16 inch

The term low-pressure is not very specific but could apply to the top end of ASME Class 150.

The pressure rating generally declines as the line size increases.  Triple offset butterfly valves rated ASME Class 600 are common up to NPS 12; some are available to NPS 16.  Class 300 triple offset butterfly valves are available to NPS 36 (DN 900).

I think that triple offset butterfly valves can open and close with full ASME pressure class differential as a generalization.  That would not be as likely for conventional butterfly valves.

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