Thank you Gerhardl
Is it helpful to know how much torque applied to prevent similar situations later? And if the answer is yes how can I know how much is the limit torque or thrust?
Materials and Welding Eng.
Hello,
I want to know what is the reason of galling (Photo) on the gate valve stem. the stem is 410 and the yoke nut is A439 D2. as you can see from the photo there is a very bad galling occurred.
please advise on following items:
1. why it happened? how I can calculate the force(thrust) they...
Thank you for all of your explanations.
The manufacturer accepted the failure but two questions still remains:
1. Are we allowed to test the valves much longer than API 598 duration? if instead of 15 sec we test the valve for 10 min and valve failed after 15 sec by leaking (please forget the...
Thank you Zdas04.
I think you are right. but at the same time manufacturer is right too as they did the test and no leakage observed and I believe they followed the valve requirements of API 598. The manufacturer had not been asked to comply with ASME 31.3 requirements.
Why duration of hydro...
Hello,
2" A105 forged valve failed during the hydro test as revealed a pinhole defect. the required time per API 598 is 15 seconds while the test we done was done for 10 minutes (40 times more) at the required pressure (1.5 MAWP). the test was done just on the valve separate from the piping...
Because CD3MN IS NOT A LUSTED MATERIAL ( actually it's listed but under a wrong spec) and just B31,3 allows unlisted materials.
Materials and Welding Eng.
Hello,
I need to calculate the thickness of gate valve for unlisted material based on ASME B31.3 - 304.1.
In this case as the valve is unlisted I don't have the related pressure to consider for the equation.
My question is that how can I calculate pressure for each temperature (100F...
Hello,
I need to calculate the thickness of gate valve for unlisted material based on ASME B31.3 - 304.1.
In this case as the valve is unlisted I don't have the related pressure to consider for the equation.
My question is that how can I calculate pressure for each temperature (100F...
Hello,
I need to calculate the thickness of gate valve for unlisted material based on ASME B31.3 - 304.1.
In this case as the valve is unlisted I don't have the related pressure to consider for the equation.
My question is that how can I calculate pressure for each temperature (100F...
Hello,
Does CSA Z 245.15 have wall thickness requirement for valve body? does it refer to ASME B 16.34 or any calculation?
please help me through this.
MRSohrabi;
Materials and Welding Eng.
CRN is Canadian Registration number.
I need to know if valve end connection altered from threaded to socket then i need to apply for CRN or as i mentioned need to do it in certified shops or original manufacturer place.
MRSohrabi;
Materials and Welding Eng.
Hello,
If as a supplier we change the valve end connection from threaded to socket weld then I want to know if we need a new CRN or just do it in a certified shop? any reference or code for this?
please advise
MRSohrabi;
Materials and Welding Eng.
Hello,
I have a 20" #1500 PSV Gate valve. The schedule of but weld ends should be changed from 120 to 160. and then this valve will be welded to pipes.
I want to know if there is any PWHT requirements for this.
Also is this allowed to overlay around 12mm (change sch from 120 to 160 for 20")...
Hello,
I'm wondering if A105N+Stellite is acceptable for low temp sour service SEAT? I have two drawings one is LF2/STL and the other one is F316/STL for seat. IS A105N/STL is an acceptable substitution?
please advise.
MRSohrabi;
Materials and Welding Eng.
As ASME B16.34 just talk about body and bonnet NDE and doesn't mention any thing about bypasses.
I want to know that the requirements can be apoed for bypasses?
MRSohrabi;
Materials and Welding Eng.
