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Do Pumps internal PRV still require and external PRV?

Cory you just saved my job!!!

What is NACE RPO472? I have a specification stating that all welds must meet requirements of NACE RP0472. Please help.

Thats what I thought. This site is full of so much info!!

Question: We are in the process of currently having a skid package that is undergoing the rigorous TSSA inspection. The inspector asked to see the CRN number of the pump, I had been operating under the assumption that CRN Registration did not apply to the pumps. Could some knowledgable person...

This is an incredble site. The suggestions just keep pouring in!!! Thanks to all who responded, your advice is very very very much appreciated!!! (PS made me look smart in the boardroom!!!) Look for my thread regarding CRN- Numbers and how they apply to pumps or do they?

Thanks guys!! Yes the flows are too small to apply the standard velocity principles, so it's nice to get some experienced input. My biggest concern was not being able to fill the pipe up on horizontal flow as I would have to maintain a "set" pressure. I based my size on the pump size which in...

How do you determine inlet Line Size for very low flows, especially for metering pumps. system needs to be able to do 82 Liters/hour. For that matter how do you size a discharge line at this low flow? Velocity is certainly not an issue, what is the rule of thumb?

What if any are the alternatives to using a "Calibration Column" on a piping system? The method just seems to be a little archaic for our times. On that note, would anyone know of any Calibration Cylinder manufacturers or distributors, and would anyone happen to know if CRN registration are...

You answered my question. Thank you. This is indeed a useful site.

Is there such a thing as a fire safe check Valve? And if so would anyone know any Canadian Suppliers, I'm looking at sizes under 2", 316SS.

This isn't Engineering related but since I talk to you people on a regular basis I thought you might be able to help. Would anyone know how to remove surfsidekick from ones PC?

I know what you mean, you ask the people there and they will give you different answers...

And on that note would anyone be able to tell me what exactly needs to have CRN on a piping system under the Pressure Boilers and Vessels act, is it just the piping and components? Anyone know the exemptions?

I have to thank you TBP, you just may have saved my job here, I informed our customer of this and they are looking into the use of the of the Backflow device!!!! Thank you sir!!!!!!!

Backflow Preventer that is CRN registered....1/2" or 3/4" would anyone be able to tell me if this exists or where I can get one, and if it doesn't how do I get around TSSA certification?

Would someone be able to tell me if CRN Numbers are required for all components on a skid or is it just the pipe and piping fittings? Have a package whos' design needs to be TSSA certified.

Could somoene give some direction on how to size a hopper for a starch application, are there guidelines that I need to abide by. Starch goes into a hopper down to mixer.

Would anyone know the basic concepts of a starch cooker? Better yet where I can find such information.

Could someone direct me to an alternative method for suspending solids? I've had too many problems with wetting cones.