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We have experienced nuisance trips at two unrelated locations with similar equipment. Looking for opinions on the cause. Location 1 - vertical turbine pump with a VHS motor installed outdoors. Pump is started with a VFD, and the unit operates successfully. However, the VFD would occasionally...

Thank you for the clarification on the connection point, and all of your ideas and comments.

BIMR - Do you have a link to an example of the suction connection? Are you referring to a suciton diffuser? Artisi - We don't have the suction pressure recorded at the 1000 to 1200 GPM, but we do know that it was 9.2 PSIa at a stable flow of ~ 3100 GPM, and it was 8.55 PSIa at a stable flow...

We have attached a drawing of the station piping. Note that the suction piping is 24" diameter, starts at elevation 578, and runs ~ 700 feet to elevation ~592. As noted, the pumps were operated today, and Pump 1 initially lost prime, pump 2 operated without problems, and pump 1 wwas restarted...

I'll see if I can run down a sketch of the system. Of note, the station was taken off line for a couple of days, and an attempt to start Pump 1 failed as it lost promeat the same point. However, last week, the pump operate wihtout a loss of prime.

Trying to resolve a field issue regarding a double suction split case pump with packed stuffing boxes, vacuum priming system, and long HDPE suction line. Single suction line feeds two HSC pumps. Suction line connects to tee to feed Pump 2 and to an elbow to feed Pump 1. Pump sits ~ 14' above...

We have a stainless steel in line vessel installed in a pipeline. The units were designed to handle an operatitng pressure of 28 PSI with a 1.8 safety factor, and were tested at 60 PSI test pressure ~ 5 years ago. The cross section of the vessels are rectangular and have welded reinforcement...

Yes, but it depends on the the composition of the bronze and the chlorine residual in the water. The manufacturer would need to give the composition of the bronze and recommended limits of chlorine.

Be careful with DIP as we have experienced failures with the gasket materials in these applications. The manufacturers used to claim, and may still claim, that they can handle the higher temperature with a special material, but over time, they eventually fail. However, I am assuming that you...

rbulsara is correct in that the problem occurs when starting the motors from a standstill and the power is being supply by the genset. The genset manufacturer has been to the site on several occasions, and to date, have been very repsonsive. Unfotunately, they have changed most of the items...

We have had a problem at a sanitary lift station and would appreciate any comments or suggestions. The station is equipped with two (2) 28.2 HP (21.0 kw)submersible pumps and a 80 kw diesel generator with an 200A automatic transfer switch. The generator is sized ot operate two motors on a...