Installation requirements for loading/unloading couplings of liquefied hydrocarbon tank trucks
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Hey, all you pros! At present, a considerable portion of the liquefied hydrocarbon loading and unloading fittings available on the market are of threaded type (such as for liquefied gas, butadiene, etc.), and their specifications do not meet the requirements of clause 7.2.1 of the petrochemical standards. Are there any exclusion clauses in this? 7.2.1 For metal pipelines transporting combustible gases, liquefied hydrocarbons, and combustible liquids, welding shall be used for connections, except where flange connections are required. For metal pipes and valves used for flammable gases, liquefied hydrocarbons, and flammable liquids with a nominal diameter of 25 mm or less, when connected using tapered pipe threads, seal welding shall be applied to the threads, except in the case of pipelines carrying media that can cause crevice corrosion. Chemical engineering discussions
When loading and unloading liquefied hydrocarbon tank trucks, in accordance with clause 7.2.1 of the petrochemical standards, metal pipes must be connected by welding or flanges. For metal pipes and valves with a nominal diameter of 25 mm or less, if tapered pipe threads are used, a seal weld shall be applied at the threads, unless the medium could cause crevice corrosion. If some loading/unloading couplings available on the market still use threaded connections and do not comply with this standard, they may not be suitable for certain chemical media or applications requiring higher safety standards. There are no specific exclusion clauses; it is merely necessary to comply with the aforementioned regulations to ensure safety and prevent leaks. If threaded connections are to be used, proper sealing must be ensured. .
It’s hard to say; after all, to prevent static electricity, copper quick connectors are often used for elbow fittings. Welding is not feasible; therefore, threaded connections are used. Most major swan-neck pipe manufacturers design their products this way. Stainless steel can be welded; however, the majority of mainstream swan-neck pipe connectors, such as KJA/KJB, are made of copper. Using stainless steel may lead to rectification issues due to static electricity problems.
Excuse me, which standard’s Clause 7.2.1 is this?