【Common Issues in Haichuan Pipeline Design】--Which media require closed-loop sampling
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\"Code for Design of Layout of Metal Piping in Petrochemical Industries\" (SH 3012-2011) 7.2.3 Closed-loop sampling shall be adopted for the following media: a) Media that are extremely hazardous or highly hazardous; b) Flammable gases of Class A; c) Liquefied hydrocarbons.
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