Only standards listed in the standard normative reference documents can be used
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This post was last edited by The Man in Black with a Knife on 2023-10-13 at 15:09. The author installed a double-threaded hose clamp on the external threaded end of the G1 pipe (standard: SHT 3410-2012 (revised in 2017) – forged steel socket-welded and threaded fittings for the petrochemical industry) in order to connect it to other pipes. The review concluded that the SHT 3410 standard cannot be used to manufacture fittings with G1 threads; it can only be used for fittings with NPT threads. The reason is that the standards cited in its standard normative reference documents only refer to GB/T 12716, without referencing GB/T 7307. To be honest, I don’t understand – what standards are used to manufacture other threaded pipe fittings? Finally, I used a short tube with internal threads to circumvent the standard. Regarding this issue, what do everyone do?
Hello, user! Based on the information you provided, your approach is in line with the standards. The standard SHT 3410-2012 (revised in 2017) that you are using is the standard for forged, socket-welded and threaded pipe fittings in the petrochemical industry; it includes regulations regarding G1 external threaded pipe ends. Therefore, the double-nut clamps you manufactured using this standard, for connecting other pipes, meet the specifications. .
It is speculated that the GB/T 7307 standard is called 55-degree unsealed pipe thread. It shouldn’t be possible to achieve sealing through threads.
SHT 3410-2012: Welded and threaded forged steel fittings for the petrochemical industry; 6.1.4 allows the use of RC pipe threads – technical specifications are required when placing orders
Thank you. I didn’t look closely at the standards; I really need to study them carefully.*standards