I have recently experienced two different fatigue failure on a large diameter studs used on reciprocating mud pumps. When examining the failure, we found a very unusual thread profile that we first thought was a manufacturing defect, however we have now learned it was by design. The pumps were...
You should use a reciprocating piston pump. There is really no other viable choice for this application at those pressures. You should consider a piston pump with a liner wash system (recirculated water or glycol mixture sprayed on the back, or atmospheric, side of the piston) for optimal...
I've always been curious into what's behind an ANSI B16.5 flange pressure rating and the "class" that it's normally referred to. For example, and CL600, or 600#, flange actually is rated for about 1,440 PSI in typical materials and services. Where did the 600# come from?
Thanks
One of the most important, and often neglected, components of a good stuffing box design is the follower ring, or follower bushing. It's the close fitting ring that needs to be installed directly behind the packing on the atmospheric side and in front of the packing nut. It's purpose is to...
We had decided to use the EP Gear Lube in these new pumps only to simplify our maitenance procedures (we have numerous National pumps running in our facility, and did not want to have a different process for what is essentialloy the same type of pump). Obviously we will change the oil to the...
Can anyone help me understand why a Gear Oil with EP additives could potentially cause a a conecting rod journal bearing on a reciprocating pump to fail?
We have had repeated failures of crank pin bearings (the split, insert style, babbit lined journal bearings on the big end of a connecting...
I have been given the following materials from a Chinese vendor for o-ring materials. I think the GB1235 is a pretty common standard in China, but I can't find any cross reference to what they are equal to in the USA.
Does anyone know what these materials are (I think they are Buna-N)?
Is...
Does anyone know what ZQAl 9-4 and ZQZn 6-6-3 cross reference over to in USA standards? I think both are bronze or aluminum bronze, but I can't find any way to cross over to what they approximate in the US.
Thanks
