In the same pipeline (3/4”), the flanges are 150LB, but why are the tees and elbows 3000LB?
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In the same pipeline, the flanges are 150LB, but why are the tees and elbows 3000LB?
The original poster must have made a mistake: I can write at most 300LB for you
Design pressure 150LB, are the tees and elbows to be used from stock? Otherwise, I really can’t think of any reason
150LB is the pressure rating, corresponding to PN2.0; 3000LB is the wall thickness category, indicating thick-walled fittings.
They are definitely socket-welded tees and elbows, with wall thickness grades of 3000Lb and 6000Lb, as specified in GB/T14383-2008
150LB is the flange pressure rating, while 3000LB refers to the wall thickness of the elbow. The designer first determines the outer thickness, and then uses that thickness to find the corresponding wall thickness standard, which results in this value. That’s also possible.
The minimum wall thickness for socket elbow tees is 3000LB; it cannot be thinner than that.
150LB is the flange pressure rating, while 3000LB is the pound rating for socket weld pipe fittings.
Fittings with a thickness of less than 2″ are generally of the SW type, that is, socket weld type; the lowest grade available is class3000, which corresponds to a wall thickness of SCH80.
It’s just like the root valve on a pressure gauge. Small in size but high in stress tolerance. It’s not that he wants it to be that high; it’s that such a small thing can withstand such high pressure.
3000LB is a standard for indicating wall thickness, but it is not a national standard; it is an American standard: ANSI B16.11. This designation is used only when the joint is of the socket weld type, while butt welds are generally indicated using the SCH standard.
The original poster is correct: 150LB is the flange pressure rating, corresponding to PN2.0, while 3000LB refers to the wall thickness class, which is the weight rating for socket-welded pipe fittings.