May I ask what type of loose-flange is used for lined pipes?
Thread Content
One end of the lined pipe is fitted with a butt weld flange, while the other end has a loose-flange connection. What type of flange is used on the side with the loose flange? If HG/T 20592 of the Ministry of Chemical Industry is adopted, there are two types of loose-flange designs: butt-welded ring loose-flange and slip-welded ring loose-flange ； When GB/T 9124.1 is adopted, there are 5 types of loose flanges, namely A/B type butt-welded ring plate loose flanges, socket-welded ring plate loose flanges, pipe-end flanged loose flanges, and flanged short-section loose flanges. I would like to ask: in the case of selecting either the Ministry of Chemicals standards or national standards for loose-flange lined pipes, which type of loose flange corresponds to each set of standards?
The first one of the first type, and the fifth one of the second type are the ones I’ve seen; I haven’t seen the others
The same question: mainly, different types result in variations in the length of the matching bolts
Generally, the type used is a butt weld ring + butt weld flange