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Hi gerhardl, Sorry for the very late reply. I appreciate your response. To summarize, seat insert is inserted into the seat ring, yes? And then again what is seat? Or does seat = seat insert + seat ring? Kindly explain. Thanks!

Working on that now. Thanks SPDL310! :D Thanks!

I believe API 6D does not have specification for torque. Correct me if I'm wrong. Thanks!

Hi SPDL310, Just to clarify, when you said "...set torque to create the appropriate pre-stress" - did you mean, the "set torque" value is calculated or we just have to guess an approximated value? Thanks!

Hi Gilmiril, Thanks for the correction! Thanks!

thread408-157477 Referring to the thread attached; When it comes to designing the valve by ourselves: 1. Do we calculate the torque, as in we design the torque for the valve? 2. If we measure the torque, that means we did not take into account the torque value when designing earlier? 3. A...

Hi LittleInch, Yes, was in need of assurance! Thanks!

Greetings! Referring to API 6D, para. 9.3: "the test pressure shall be 1.5 or more times the pressure rating determined in accordance with 5.2 for material at 100 deg F (38 deg C)"; if I am to run a pressure test on a 2" 150 Ball Valve, A105 material with 150 deg C pressure rating, which gives...

Hi CKchi, Thank you! Yes, I found that very helpful. On the other hand, I watched this video https://www.youtube.com/watch?v=mWXjvVMvz6Q which is an animation for valve assembly. If you watch this and see at 1:08 onward, did the video maker actually mistaken the seat insert with the seat?

Greetings, Can anyone kindly explain to me what are the differences between seat, seat insert and seat ring? Valves figures in API 6D show only seat ring and I got confused when I saw valve drawings with seat and seat insert.

Hi everyone! Can somebody explain to me how to calculate the breakaway torque for ball valve particularly for 2 inch - class 150 ball valves. The material for seat is PTFE and the ball is made up of ASTM A105. Thanks!

Hi Gilmiril and TGS4. Thank you so much for the answers. To start with, the design report or rather the design package was originally written by the previous engineer before I commenced, my job (as been instructed to me) is to find any mistakes in the calculations and to correct them. I do...

Hope these images would help and thank you so much for keeping up with me. [dazed]

I'm trying to solve the total membrane stress intensity for the pipe-line tube in a flange adapter. Rated working pressure = 10,000 psi 3 1/16'' x 4 1/16'' Flange Adapter. I'm sorry I really have no clue regarding total membrane stress intensity(never encounter this term before). Could you...

I just started working as a graduated engineer. Never heard of total membrane stress intensity during my studies and yet have to solve the total membrane stress intensity. Anyone can teach me about membrane stress intensity and how do I calculated for the total? [sad]