Can a necked butt-welded flange on a high-pressure gas pipeline be directly butt-welded to an elbow?
Thread Content
If possible, could the teachers please advise which specifications or standards it comes from?
It’s okay, I’ve seen it in person anyway
Direct welding is possible, but care should be taken as the bolt holes in the flanges of small-diameter pipes may affect the tightening of the bolts.
A flange with a neck is acceptable, but a plate flange should first be welded to a short section before being connected to the elbow.
No, pipe fittings cannot be connected directly to each other; a section of straight pipe must be added
So, in which specific standard is it specified?
Welding is possible, but the amount of displacement at the elbows must be taken into account. Generally, there is significant displacement at the elbows of pipes; it is necessary to prevent excessive displacement from causing leaks at the flanges
Regarding the standards, Section 11.1 of SH 3012 discusses the relationship between flanges and elbows