I would like to consult the experts regarding the sealing materials for hydrogen pipeline connections
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Experts, I have a question: Section 4.4.4 of the national standard GB4962-2008 stipulates that for the connection of hydrogen pipelines, \"it is prohibited to use tape or other insulating materials as sealing means\"”； Furthermore, clause 12.0.5 of GB50177-2005 stipulates that \"the connections of hydrogen pipelines shall be made by welding.\" However, the connection to the equipment and valves can be made using flanges or tapered pipe threads. At threaded connections, polytetrafluoroethylene film should be used as a filler. ”Are the two statements contradictory? What is the purpose of making these regulations?
It’s not contradictory. The prohibition of using insulating materials for connections is aimed at ensuring that the static electricity in the entire pipeline can be discharged promptly; here, this refers to the existence of alternative conductive sealing materials (metal gaskets). To ensure safety, it is generally required to use wires for bridging between the flanges as well. For threaded connections, it is necessary to use PTFE materials for sealing, as this provides the best sealing effect. But it is still necessary to properly perform static grounding.
There’s no contradiction; hydrogen pipelines do require static electricity bonding
Thank you~ So it’s fine to use polytetrafluoroethylene for pipe threads, but static discharge bonding must be properly carried out, right? It’s true that polytetrafluoroethylene provides a good seal; the sealant used before would leak.
Thank you\ud83d\ude4f