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these are Shell specification

rgui · 发表于 3 天前

来做个说明：
SEP 77 302 Material, Examination, and certification requirments for valves in general services.
SEP 77 303 Material, Examination, and certification requirments for valves in special services.
SEP 77 306 Production Testing of Valves in Low Temperture Service
SEP 77 307 Production Testing of Valves in Vancuum Service

ggx1985 · 发表于 3 天前

merci

ggx1985 · 发表于 3 天前

share more please

Shell spec

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