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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

Would a manual globe or gate valve with actuator be classified as a sliding stem valve assembly?

Already explored with them, but seems they are not willing to provide. Don't know why.

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

Yes, the valve is a control valve in mid to fully open range.

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.

The arrangement is flange-gasket-spacer-gasket-flange Spacer is 0.19" thick

I am working to ASME VIII-1. There is nothing in there that prohibits more than 1 gasket.

Thanks. Can you please indicate a couple of Codes that prohibits this?

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...

I am sorry, but how would the bypass valve work? We do not have gate but globe isolation valves that bound the isolatable volume. Also, when one gets a resultant pressure of say 13,000 psig for the blocked in liquid what code stress limits are used for the evaluation of the piping and the...

The discharge piping is around 20 meters and with a few bends and leading to the floors below.

I do agree that correlation factors do not exist between media. If the valve is to be tested on steam and is tested on air, will give you a whole different set of results when retested on steam. A relief valve is set for a certain set pressure for the specific media (and capacity certified), be...

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.