So, we have a vendor who is proposing to perform the seismic testing on one production valve and then ship that to us along with 3 other identical valves.
The other 3 valves would be deemed as seismically qualified by default, as they are identical to the tested valve. I know that in the Code...
Hello folks,
How does Teflon perform as a packing material versus graphite, kalrez, etc. for Pressure or Temperature Control Valves? Anyone has extensive positive experience with Teflon and what what grade, etc. was it?
What is the best packing material? Any information would be appreciated...
On what media do air sets or pressure regulating valves fail more i.e. compressible or non-compressible media?
Would a self venting air set fail at a lower rate than a non venting air set?
Clause 122.5.1 of B31.1 states that "Where pressure-reducing valves are used, one or more relief devices or safety valves shall be provided on the low pressure side of the system. Otherwise, the piping and equipment on the low pressure side of the system shall be designed to withstand the...
thread378-355417
If someone can provide a basis for this statement would be great.
"If you're talking small pipe (NPS <=2) and cold temperatures (<= 200°F) where the consequence of failure is negligible, then go for U-bolts and assume whatever you want."
This question is related to piping...
In WB, I created geometry in mm. Selected mm on the project schematic for the Model and then when double clicked Model, the Mechanical window opened up but showing the model in meter. Any way to change this to mm? Geometry still shows in mm. Thanks
Folks,
Is it possible to get a hold of a couple of Copes Vulcan Globe Valve bodies? We need it for some testing purposes. Body size is 4" and 10" for their CV-600 valves. Need one of each. If it is part of an existing or used valve assembly, is fine.
Thanks
A valve vendor is claiming that there is little correlation between the valve body inside contours and the Cv. The valve in question is a globe valve. My instinct says this is incorrect, however would appreciate any expert or experienced insight.
If I use more than one gasket at a bolted joint, will it impact the torque to be applied? i.e. will the torque be greater with 2 gaskets as opposed to that with a single gasket? I would appreciate any input.
We have an existing pressure vessel to which we are attaching external stiffening ring. The attachment is not by welding or brazing but as a clamp. i.e. a complete O clamp is being used here. The purpose is to change the modal response of the vessel and also to act as a support for a motor that...
How to calculate built up back pressure when hot water relieves and flashes into steam in the discharge piping?
Relief Valve is 1/2"x3/4" with a set pressure of 1000 psig. The water temperature is 107°C.
Folks,
How do I calculate the flow through a fully open globe valve when Cv and maximum upstream pressure is known? Any tips would be welcome. The pipe and valve is 1" NPS and also for this case, since I am sizing a relief valve, I will be ignoring pipe friction.
Thank you.
If an analysis is done to the ASME I, III or VIII code for a loading that is extremely unlikely say with a probability of 1x10-6, and if the allowable stresses are exceeded, can we use the values specified in the actual material test reports as the true allowable stresses? If we are allowed to...
We have a blocked in liquid scenario between two isolation valves and the medium is water. In our case the temperature is rising from 20°C to 110°C.
My issue with the formula {5.14.4.1-d-(3)} is the variability of the following three variables with respect to pressure and temperature.
αv {is...
We have a vented tank inside containment that is not accessible during plant operation. There is a pressure gauge connected to the 14" inlet line connected to the tank. This gauge is outside the containment. If, because of conditions (unknown) inside the containment, the water inside the tank...
Can anyone please elaborate on the differences between the ASTM and ASME material grades? I know that ASME SEC III calls for ASME material while ANSI B31 calls for ASTM.
For seismic qualification of valves, a static side load test is performed on a valve but I am trying to find the definition of the extended mass of a valve, if someone can please help. The valve I am dealing with is a manual globe valve with bellows seal.
Clauses NX-3515 in ASME III indicates bellows need not constructed to the requirements of the subsection if the bellows does not retain pressure and Design Pressure
is imposed on a required backup stem seal such as packing. But, a bellows in a bellows sealed valve is always retaining pressure -...
Unless I am wrong, isn't the design pressure of piping downstream of an isolation valve that is capped with a pressure gauge, supposed to be equal to the upstream design pressure? And I believe this to be case also even if there are two isolation valves that are normally closed; since valves...
