Must liquefied hydrocarbon emissions be released in a sealed manner?
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Article 9.1.11 of the Code for Design of Oil Depots GB50074-2014: Venting and discharge devices should not be installed on pipelines transporting corrosive liquids and liquids with toxicity levels I or II. If venting and discharge devices must be installed, measures should be in place to collect condensate in a sealed manner. Since there is no requirement for the sealed recovery of liquefied hydrocarbons, are there similar requirements in gas regulations? At present, what are the adverse effects of non-hermetic recycling?
According to GB50160, liquefied hydrocarbons should be discharged in a sealed manner into a flare or other safe venting facilities.
I also noticed that the original poster mentioned this one. Code for Fire Protection Design of Petrochemical Enterprises GB50160-2008 5.5.17 The condensate in the flammable gas vent pipes shall be recovered in a sealed manner and must not be discharged indiscriminately. (Bolded emphasis) Although this requirement exists, it is also stated that combustible gases that cannot be sent to a flare or an emission treatment system due to process conditions or medium properties can be directly released into the atmosphere through exhaust stacks or vent pipes. Like in many reservoir areas, no flare lines are installed; any emissions can only be released through intermittent exhaust stacks.
I would like to ask whether there are any specifications indicating which materials cannot be vented directly behind the safety valve; instead, a collection tank must be used to capture or absorb them before venting
From a regulatory perspective, I think several guidelines can be followed: The \"Code for Design of Industrial Metal Piping\" GB 50316-2000 stipulates that fluids of Category A1 (highly hazardous) should not be discharged directly into sewers or the atmosphere; instead, they should be sent into closed systems. (The \"Code for Design of Layout of Metal Piping in Petrochemical Industries\" SH3012-2011 is consistent with these requirements.) The requirements of the \"Code for Design of Oil Depots\" are as mentioned above. In short, corrosive and toxic substances must be discharged in a sealed manner; they cannot be released directly into the atmosphere. Other flammable gases should preferably be vented through a flare stack; some of them cannot even use a single flare stack and require separate venting systems. When conditions do not permit this, the vent pipes must meet certain requirements regarding height, etc.
Liquefied hydrocarbons should be discharged in a sealed manner to a flare or other safe venting facility. During the design process, when there are conflicts between standards, the stricter standard is generally followed.
I didn’t see such a provision in the standards: Liquefied hydrocarbons should be discharged in a sealed manner into flares or other safe venting facilities.
Yes, it is stipulated in GB50160 that discharges into the atmosphere are permissible under certain conditions. In fact, small amounts of pure liquefied hydrocarbons have little toxicity and can be released directly into the atmosphere. Typically, the exhaust gases generated during pipeline processing and those from tank purging can be released directly into the atmosphere, provided that their concentration is not too high to prevent the formation of explosive mixtures.
It is usually released through flares or at high altitudes; if the amount is very small, direct release requires proper personal protection.
We discharge it directly into the torch.