Design standards for vent pipes and flares?
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What standards are generally used for the design of vent pipes and flares? What are the requirements for pressure testing?
There is a specific design specification for flare systems in the SHT petrochemical standards; go and obtain it.
SH 3009-2013 Code for Design of Flammable Gas Emission Systems in Petrochemical Industries
First of all, the question is unclear: is it process design or mechanical design? If the vent pipe is self-supporting, the mechanical design can refer to the design specifications for chimneys.