Recent content by arm83

Hi guys, Thanks for all your input. Between the two pumps I have always gotten longer and more efficient service from the Goulds pump. As DubMac has pointed out there have always been factors such as: 1. Pipe strain (prominent and has been corrected many times. Hopefully this time around...

Hi, App Eng, The curve for the Goulds should be uploaded. The major problems I had with the Goulds pump were the fusing of the wear rings but I have installed Vespel in the casing rings and that problem has been solved. Thanks in advance for everyone's assistance...

Hi Guys, Both pumps are operating at 3500 rpm. @ Pumps Only Both pumps are opposed impeller design. The control system for the pumps are different. They both have minimum re circulation lines but the multi stage pumps ones are controlled automatically while the 2 stage pumps are controlled...

Hi All, I have been looking for information that would outline when it would be suitable to use a multistage pump versus a single or two stage pump. I have a scenario where I have two different manufacturer's for my Boiler feed Water pumps. The first set of pumps are Byron jackson, a two stage...

Guys, Thanks for all the responses. You cleared up some issues for me. I was doing this research for a specific reason. Currently I have three fuel oil pumps that are operated with the suction valve partially opened and the discharge valve fully opened. This practice developed because the...

Guys, I got this quote from a website: "Pumps are normally throttled with a discharge valve, but in rare cases it can be done with a suction valve. 1. You must have sufficient NPSH to prevent cavitation. 2. Suction throttling prevents the over heating caused by discharge regulation. This can...

There are three pumps in parallel. Two of these pumps have a rated flow of 100 usgpm with a corresponding head of 150 psi while one pump has a rated flow of 900 usgpm with a corresponding head of 170 psi. When applying the efficiency equation, using the above values, I got 60% efficiency.Is that...

Hey everyone, I came across an equation to calculate the efficiency of pumps in parallel. It is as follows: H*(specific gravity) x Sum of pump flow rates (gpm) ____________________ ____________________________ k Sum of total power to...

Hi all, My company has an Allis-Chalmers motor and would like to perform a complete overhaul on this motor. We would like to purchase new bearings, but are not sure who is now the current supplier for Allis-Chalmers motors. Any info would be greatly appreciated. Thanks

Thank you everyone for your valuable input. I will definetly consult the manufacturers.

Hi all, With reference to my previous post thread407-176454 (Cooling towers and vertical pumps), I am designing a sump for the vertical wet pit pumps. I have thus far used the Hydraulic Institute guidelines but was wondering how to determine the depth of the sump. Keeping in mind that the speed...

All Thank you for your responses,and I will keep them in mind. One of the recurring ideas in most of the responses is to analyze why the horizontal pumps have had such a high failure rate over the last thirty years. JJPellin hit the nail on the head with the the horizontal bend before the...

Hi people, I am new in the industry and have to justify replacing five horizontal pumps with three vertical ones. Let me expand. These five horizantal pumps have been troublesome for the last 30 years with lots of bearing and seal failures and shaft breakage. These pumps are double suction...

Hi everyone, I have been searching online for information about the effects of a worn cutwater/throat in pumps but have not been too sucessful. Can anyone help ? Thanks alot.