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siamterm, Balancing the rotating parts of a pump is dependant on the type of pump. For example: Many ANSI (Typical Chemical Processing Pumps)are single plane balanced (also known as static balance). This can be done by placing the impeller on a shaft and mounting this between two free...

Islandeng, Hi also to PUMPDESIGNER and D23. Sorry if I offend anyone with the following comments, I haven't had time to review all of the comments. I think Coastpumpguy has come to the same kind of conclusion that I have. Several years ago, many of the couplings for submersible pumps were...

Hi PUMPDESIGNER, It's been some time since I've looked at Eng-Tips, and who do I find in the center of an interesting topic but PUMPDESIGNER. This is an area that I spent a good deal of time with over the last few decades. I think that many have already indicated that this would probably be a...

TechSupport1, I don't think that you have described your system in detail. What you are observing makes me think that you may have air (or some type of compressible gas) which is entrained in the liquid entering the pump. When flow is reduced to shut-off, possibly the air is escaping prior to...

Robjack, As stated above the Barske (also written as Barski)impeller is one of the two keys to low flow / high head pump design. The other important ingredient is a concentric casing (rather than eccentric with a cutwater). This allows liquid to stay in the casing for more than one revolution...

joisy, Another alternative centrifugal type is the Rotary Pitot Tube type which is manufactured by Roto-Jet, which I think is owned by Weir Pumps now. Richard

Thanks PUMPDESIGNER, it obviously needed repeating. Have not heard from you recently. How's business. Regards, Richard

Arisi, I agree with all of the above comments by Artisi, rmw and JohnGP. I think that the easiest way for you to check the pump performance is to obtain a copy of the manufacturers Head-Capacity-Efficiency-BHP curve. This will confirm for you whether the BHP in fact does drop as the flow...

Could you also provide the total differential head (this will also be shown on the nameplate), and the current (and voltage) that the motor is drawing. Are you aware that Dresser is now part of FLOWSERVE. I would be very surprised if they can not provide this information. As a last resort you...

PUMPDESIGNER, I'm having some problem understanding your explanation for this damage. I guess BobPE is also. I think what you are saying is that the chemical attack occured because of the high velocity, and only in specific areas. Are you making a comparison to erosion-corrosion, where the...

PUMPDESIGNER Is the pump discharging into a common header along with other pumps? Please describe the pump: vertical sump type, end suction, waste water??

Richard, I think hydrae may be on the right track. Was the suction located in a sand bar or sandy beach? Can't explain the casing being in good condition. One would expect some erosion there as well. What type of casing - volute or diffuser? Richard

PUMPDESIGNER, Please advise the impeller material, casing material, etc. Was erosion observed in the casing as well? Richard

PUMPDESIGNER, Don't give it away too quickly. Give us all time to think about it. I guess your back. Richard

dross56, If you are talking about the pump suction and discharge flanges, the answer is yes. Any significant out of alignment between the pump and piping flanges will be reflected in misalignment of the shaft. The greater the flange loads, the more misalignment. API 610 provides allowable...

upm, From the information that you have provided, we can not determine if the problem is the pump or the motor. If you remove the high amp motor (from pump 1) and couple it to the other pump (pump 2), if it continues to draw high amps at shut-off, you will know the motor (from pump 1) is not...

lilliput1, Just a couple of other points that I'd like to make. 1) When the pump is not operating, it would be necessary to have the pump discharge valve or reservoir valve closed to prevent pump rotation. Although pump rotation would be in the normal operating direction, pump speed could...

lilliput1, You are right about the pump acting as a turbine, but only on the condition that it is not operating and that the piping between the reservoir and pump and pump to discharge are sufficiently open. However, when the pump is started (this should be done only against shut-off head, and...

dross56, It is always helpful to know as much as possible about the various aspects of pump installation. However, as MortenA suggested, always refer to the pump manufacturers "Installation, Operation and Maintenance" (IOM) Manual. This document is specific to your pump and should...

Lovison, As I recall good belt drive design does not allow ratios above 4:1. You may want check this out with one of the belt/pulley suppliers.