How to choose socket welding/threaded reducer for domestic standards
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For pipes larger than 50, GB/T 12459 specified butt-welded reducers are generally sufficient； For pipes smaller than 50, socket welding or threaded fittings are generally required. However, I couldn’t find any mention of reducer fittings in GB/T 14383-2008; which standard should be referred to?
I also checked GB/T 14383-2008 just now, and found no information regarding the selection of socket-welded reducer fittings. But I checked the design documents again; when designing socket-welded reducers, the standard used is GB/T 14383-2008, the pressure class is SCH80, and the end type is SW. Please ask other sea friends to keep helping solve it!
That’s what the people upstairs said! Writing it that way is incorrect; I have encountered such situations while working on projects. For these minor fits or changes in thread diameter, SWAGE is generally used, and it’s not available in GB pipe fittings. I noticed that the products released by the Luoyang factory in the past all used their own standard part numbers, which usually looked like 40T025 and so on. When I was working on it, I had no choice but to use the American standard SWAGE MSS SP-95. However, if a project requires a smaller outer diameter, it’s important to specify that clearly in the description, so that the manufacturer doesn’t make any mistakes during production.
It seems there’s no GB standard for socket splices; everyone uses 12459. If anyone has used it, please share your experience. Thank you.
This post was last edited by The power of a team on 2012-11-15 10:19. Your design materials are correct. For reducers with socket weld or threaded connections as specified in 14383-2008, refer to the dimensions of such reducer fittings mentioned in Chapter 8.4.
Yes. For petrochemical projects, such small pipes can use SH3419 reducer fittings. It’s just a tube with an enlarged diameter. For example: a reduction to DN150X15 can be done directly. It is merely the outer diameter standard for the SH series, and it is not very suitable for HG-type pipes. It is not possible to uniformly choose pipes based solely on large differences in their outer diameters. For the chemical industry sector, choose the foreign B16.11 standard. MSS-SP-95。 Ensure a series of outer diameters.
For reducers with socket weld or threaded connections as specified in 14383-2008, refer to the dimensions of such reducer fittings mentioned in Chapter 8.4. It’s just that there are no diagrams to show it. At first, I thought the reducer fitting series had been canceled as well. I almost got fooled. This standard update is completely lacking in quality