Search results for query: *

Yes there is a sharp radius of 1/8" R at the end of the shaft just before the impeller. The diameter of the shaft at that section is 1.875". You are correct, in that the diameter at the previous section is 3.5" Probably resulting in concentrated stress build up at that point(section change) -...

Is 32 an appropriate hardness for shaft material? The shaft is 4 inches in diameter, and failure occured near the impeller end of the shaft. This shaft had been in for only 18 days...that is a short time, for a pump which operates very near BEP.

Thanks Bliter. I did look at the vibration spectrum for this pump prior to failure. The coupling was 180 degrees out of phase, and we are also getting 2X running speed harmonics. Do you think that misalignment could cause a 4340 shaft to fail, this pump operates at 70% efficiency, so the...

I have a pump which had been experiencing increased Outboard vibration, prior to shaft failure. What do you think could have been the cause of increasing OB vibration on the pump, could it have been due to defective bearings? The pump operates at about 70% efficiency, so I do not think that...

Thanks, I think that is probably the best way to go, before having the AI review the design and supporting calcs.

I would like to locate an AIA (Company) that is highly familiar with section VIII code, and the relevant calculations and have NBIC grade B personnel. In particular modification of pressure vessel shell openings. I am increasing the diameter from 14" to 20" on one of the openings- what should...

I would like to locate an AI that is highly familiar with section VIII code, and the relevant calculations. In particular modification of pressure vessel shell openings. I am increasing the diameter from 14" to 20" on one of the openings- what should I consider? I have done some...