I was referencing ASTM 403A, and noticed the designations "WP", and "CR". From past posts I found that "WP" stands for "Welded Pipe". I was unable to find a definition for "CR". What does "CR" mean? What are the differences between WP and CR? From what I could tell, it is the hydrostatic...
Hello,
I have a recent need to provide piping that is both resistant to corrosives (aqueous solutions of <10% HCL, and <10% HF) as well as have resistance to radioactive materials. We have used stainless steel in the past, but typically it gets "eatin'" within 3 to 4 years. We have tried...
Folks,
I have a recent need to provide piping that is both resistant to corrosives (aqueous solutions of <10% HCL, and <10% HF) as well as have resistance to radioactive materials. We have used stainless steel in the past, but typically it gets "eatin'" within 3 to 4 years. We have tried...
How does one calculate the back pressure imposed on a PRV/SRV by downstream components (valves, fittings, etc.) in a vent-header, including the vent header? I imagine one would use equivalent lengths for the compenents....? I have a high pressure application (2400 psig venting/relieving to the...
Folks,
I was under the impression that Swagelok fittings were the same as VCR fittings -- however, I have been told otherwise. Are these one in the same? If they are different, what makes them so....?
Folks,
I have been asked to specify an excess flow valve (EFV) for a high purity hydrogen system with 1/2" tubing/piping. The system will be at 165 PSIG, ambient temperature. We would like to run the system at a max flow of 420 standard liters per minute (SLPM), or approximately 15 SCFM. The...
Recently, I was getting information on a manufacturer's ball valve. The cut-sheet on the valve states that the seats and seals of the valve are made from 2nd generation PTFE. Anybody know what 2nd generation PTFE is? I have never seen this designation, and I really didn't get a good...
Hello everyone,
On a recent search for PVC butterfly valves, I noticed that most companies refer to ANSI Class 6 shut-off as criteria for valve quality. I need to know what ANSI Class 6 shut-off means, and how the valve is built/tested to meet this criteria. What standard does the ANSI Class...
Guys & Gals --
Does anyone know how to calculate the pressure drop across an expansion joint? Or, what kind of pressure losses and/or K (Cv) values can one expect from an expansion joint? Lets say for water at any condition. I have checked with several manufactures, and they don't seem to...
Does anybody know the best type of pump for 2 phase flow (gas volumes up to 4% in liquid) involving flow rates up to 100 [GPM]? And if so, do you know of any manufacturers?
note: liquid being pumped contains aqueous ammonia and hydrogen peroxide (mostly water.
Currently I am having problems with inadequate pump priming, and low pressure before and during operation of Centrifugal Magnetic Drive Sealless type pumps. I am pretty sure it's because of the entrained vapor and off-gassing of O2 from the ammonia stream being pumped. Can anyone help me out...
