Number of flange bolts?

2010-12-19View Original

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I didn’t pay attention before; it’s only today that I noticed that according to JB/T4703-2000, for flanges at 1.0 Mpa, the number of bolts is 40 for DN1000, 36 for DN900, 32 for DN1100, and 36 for DN1200. What’s the reason for this? There’s a mistake; is there another change order? Hehe, I couldn’t find the change order. I hope the friends involved can clarify this! Thank you!

Reply #22010-12-19

The original poster only paid attention to the quantity; did they consider the specifications of the bolts?:) For flanges with a pressure rating of 1.0 Mpa, there are 40 bolts for DN1000 and 36 bolts for DN900. The bolt specification is M20. For DN1100, there are 32 bolts, while for DN1200 there are 36 bolts, with a bolt specification of M24. There shouldn’t be any contradictions here!

Reply #32010-12-19

Those words woke me up from my dream, haha, thanks

Reply #42010-12-19

I’ll learn it too! :handshake

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Number of flange bolts?

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