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BigInch, Thanks. I did not check Appendix A since I was so focused on the high pressure requirements of my application (10,000 PSI). What I'm really asking is, if this material is so strong, why would it not be listed under Appendix K? Or am I being too careful? (Hard to imagine being too...

Sorry, the spec I referenced should have been ASTM A789...the A240 is for plate. I guess there is no way to edit a post after I've posted it.

Does anyone have any ideas why ASTM 240 is not listed as a specification in ASME 31.3 Appendix K (the Allowable Stresses Table for Chapter IX High Pressure piping)? Does anyone know of a reason it would not be a suitable material for high-pressure?

I forgot to mention that I would prefer to blow off excess air to keep this from going into surge, since the Inlet Guide Vanes are out of service.

It's designed to control flow. One additional item: I would rather use blowoff than inlet guide vane throttling, since the IGVs have been disabled for a long time.

Does anyone have a suggestion on how to prevent a blower or compressor from going into surge in a VFD application? Since the machine operates at different speeds, just looking at one pressure won't be enough. Do we also have to match speed to the pressure (or flow) at each speed curve? There...

Does anyone have any ideas on how to prevent a blower from going into surge in a VFD application? Since the blower is going to operate at different speeds, it seems that just looking at one pressure will not protect the system at other (higher or lower) speeds. Thanks