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Hi Everybody, I was wondering if anyone knows the Inflow Performance Relationship (IPR) equation? I would really appreciate your help. Thanks, ADNPD

I understand that there are rolling diaphragms which are essentially stress free. However I would like to know if I could get away without using one. Essentially, I am asking about how to determine the flexural strength of an elastomer. Thank you for your reply.

Hello, I am designing a piston cylinder with a moblie elastomer (nylon with neoprene coating) diaphragm seal that moves with the piston. How do I go about determining the travel of the diaphragm before failure of the elastomer? Your help would be greatly appreciated. ADNPD

Could someone please explain the criteria for what constitutes as a thick walled and thin walled pressure vessel. Also, is the hoop stress and longitudinal stress formulas valid for both?

Can anyone tell me why Globe valves seal more efficiently than Wedge Gate valves?

Dear All, I was presented with a question concerning valve sealability against natural gas. The question was, in a high pressure full port complete flow channel would a wedge gate valve be able to provide a good enough seal? I thought that if an elasomeric sealing element were placed into...

DLANDISSR, Thank you for your reply. It was very informative and helpful. If I wanted to use a gate valve are there any sealing elements which would be beneficial. Thank you. ADNPD

Correction, I was actually wondering if a ball valve creates a better seal than a gate valve when the flowing element is a gas. Thanks

Hello, I was wondering if a globe valve creates a better seal than a gate valve when the flowing element is a gas? Also, are rounded seals better than flat faced seals? ADNPD

The particular field in which I will be designing this 2" pneumatic valve is for the oil and gas field. It is an actuator. I am wondering about mechanical seals, wear of material, flow ports.

Dear Expert, I am trying to design a motor/pneumatic valve from scratch. I was wondering if there are any helpful resources online or books that would be of any use in this area. Your suggestions would be greatly appreciated. Thanks. ADNPD

Thanks for the reply, however I cannot obtain an electronic copy of the document, do you know of any websites that provide this information for free?

Dear Expert, I am looking for some internet resources which would provide information on the dimensions of various ANSI Flanges. I am particularly interested in Orifice flange unions with flange taps. Thank you in advanced for your help. ADNPD

Hello, I am trying to find a dimension chart for various classes of ANSI flange plates with flange taps. Does anyone know of any websites that have such information. Thanks in advance for your help. ADNPD

I am trying to find a sizing or dimension chart for various classes of flanged plates (ie. 600, 900, 1500) with flange taps. If anyone knows of a website I would greatly appreciate it. Thanks in advanced. ADNPD

I am wondering how to calculate the Pressure Rating for a hammer union.