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Thanks to all for your suggestions. We will do some check (strainer cleaning, instrument checks etc) before taking another test run. Will update when I get more data.

I attached a sketch for the system and basically, we have pressure gauges on both suction and discharge of the pump and individual recycle line with flow reading for each pump. As per design Suction head 41.2 m, pumping temperature 130 degC. SG 0.935. Vapor Pressure = 2.7 barA (29.4 m)...

Correct me if I'm wrong, but I understand that NPSH required for hot water is actually lower when tested with cold water. I do not have the Perry Chem Engg Handbook, thus could not check that.

I found out from the OEM that the rotor is expected to vibrate in rigid rocking mode at operating speed, thus I think that is the reason high speed balancing is not required as standard.

We recently installed a brand-new B pump from the factory. After running it for 4 hours, the oil in the NDE thrust bearing turned dark, and we discovered metal chips in the oil. We haven’t removed the bearing for inspection yet. I plan to conduct another test run and want to gather all necessary...

We have a boiler feed water pump that consistently fails at the thrust bearing (2-stage, between-bearing, radial split pump, see attached picture). Out of the four pumps operating in parallel, the failure always occurs at the B pump location. Upon examining the failed bearing (back-to-back and...

One of the turbine blades broke and damaged the rest.

We have a GE Frame 5 rotor that was damaged 5 years ago. It was sent to GE for re-built. Only low speed balancing and running speed test (casing vibration reading < 2mm/s, no displacement reading taken) was performed after the re-built. The rotor was stored vertically since then. This year, we...

Hi Johnny, Sorry for taking so long to reply. We were checking a few things over the past few week to determine whether this vapor leakage is excessive or not. We measured it at 2000 ppm, and so far it has been stable, not worsening. The plan 21 flush and temperatures are normal and...

We have a Sundyne LMV 311 with single seal plan 21, operating in hydrocarbon service. We recently overhauled the pump. Both port 1 and port 2 drains are extended out of the noise hood and routed to a nearby drain. Port 1 drain length from the pump flange is about 3m while port 2 is about 6m...