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...
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...
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.
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.
Hello,
What is the NDE requirements for by-passes welds on cast valves per ASME or API? Do codes require MPI on bypass welds or it is just an industry practice?
thank you,
MRSohrabi;
Material and Welding Eng.
A recycle pump was blocked in for a bonnet gasket repair on a warmup line when the outside suction valve bonnet gasket started leaking. A small fire ignited under the insulation blanket.
Valve was closed to block in the pump. Several hours after closing the valve, the valve leaked out of the...
I’m having a mental block with respect to impact testing of ASME IX weld procedures. If we see a WPS which reports 10% shear, is this acceptable for ASME IX? I know this values is quite low (alarmingly so), but can we reject the WPS do to the low values?
The example WPS template ASME provides...
