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Thanks for the responses guys. So either corrosion resistant or cold rolled. One is a characteristic/property, and the other sounds like a process. I've looked at the CASTI, and I did find the abbreviation definition for "CR". What's the major difference between "WP" and "CR"? Any ideas.

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...

Folks, I can't seem to find a supplier of Inconel 690 piping. Any suggestions on who makes this stuff?

Folks, thanks for all of your valuable insight so far.... Sounds like Hastelloy C-276 will be the best fit, although, it runs about 100 bucks per foot. Hmmmmmm....they probably don't make anything cheaper, do they?

pwtomlin, We have used 304L and 316L, schedule 80. Carltogr

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...

Thanks Latex, where could one get easy access to these "hand calculations" without reinventing the wheel? carltogr

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...

It is a Teflon lined expansion joint with bellows -- very much similar to the Unisource, 1501 TN (PTFE lined), or similar to the Mason (Mercer) Industries 700 series. Hope this helps.... thanks

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...