Thread specification of threaded flanges
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Dear experts, I’ve encountered a project recently where threaded flanges are required for the 1-1/2\" BSPT male threaded stubs on 1.0MPa steam pipes. I have two questions for everyone: 1. Should the thread for a threaded flange be Rc or Rp? 2. Does the flange pressure rating need to be PN25? Please give me some advice. Thank you!
1. Both Rc and Rp can match the BSPT external thread. HG flanges come standard with Rp threads, but Rc threads are also available; GB flanges only provide Rp threads. 2. For DN15~DN40 flanges, PN16 and PN25 are actually exactly the same.
I took a look at the question. Let’s set aside the issue of thread matching for now. The medium required by the process is a 1.0 MPa steam pipeline. So what is the temperature of this steam? Is it greater than 200 degrees? Or higher; generally, when connecting threaded pipes and threaded flanges, tape or hemp rope is required, so you need to take such high temperatures into account.