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mmm, In case of accomodating future capacity increase, i think it is better to try to estimate this value to know impact on pump.

Reliability goes up between 70-120% BEP. Hydraulic and vibration, seals, bearings problems decrease in this range. That is because design of pump ocurrs at BEP. I hope this helps.

No it is not on API. This pump does not meet API 610 standard. Recessed impellers are used for other industries, application and fluids that are not on gas/petroleum refinery industry.

Internal RValve are reliable than pump itself. But it is recommended to use another in the system , too.

Yes, it not mandatory but API610, but it will be mandatory by your specificaction, datasheet or your description uses on your purchaser order.

Goes from 4000 to 12000 GPM will impact in TDH (actual of 150 ft) So GPM increase around 3 times, and it is huge change. If static head is 0, then TDH will increase 9 times, about 1350ft of TDH!!!! So you may take care about pipeline system too. Maybe modify to try to not to go to 1350 ft. If...

Thinking in Centrifugals. MultiStage Radial Section or Ring section called BB4 with acceptable effy of 40%. OH2LF - Low Flow could do it, but very low effy , around 12%.

I understand you work on engineering company or project area and you have different 03 pumps packages. Pump packages are not for the same services. But when you define this bid, did you define technical evaluation method?

You are buying or selling pumps? Recommendable is that your run test will be with lab mechanical seal. There is another tests for Job mechanical seal.

Simple. You could cut performance curve to 110 or 120%.

Yes, Made a front view of tour impeller, measure angle of vane line and tangencial line in eacn vane. average angle could work very well. As per desing, you could calculate Ns and go to pump handbook to see how much angle will be. You may underfile or overfiled vanes an change performance curves.

American Pumps Mfg: Goulds, Flowserve, Viking, a long etc. European Pumps Sulzer, KSB, Bornemann, a long etc. What are major number of pump on your plant? What has better after market services? Some questions could help to find suitable one for you.

Why do you run pump at different speed? What is your reason to do that?

See HI Standards!

All, I think "every" means "often". It is recommendable to has an air receiver is essential to every compressed air system to act as a buffer. Control valve will do continuing compressor running loosing energy. If power compressor is high, you will loose a lot of money with control valve. I...

Swapanburo, Do you work on power plan or what kind of industry? What is the service? What type of centrifugal pump it is? What is the temperature and fluid? Please specify some details in your question. There is a lot of literature, but please be a little more specific.

Vasquezand1, Do you looking for pump mfg or engineering company to make engineering first? It seem to be a small project, it is better to do by your own. If you need a specified amount in a reactor for example, you will use a metering pump if capacity is low. If your applications fall in...

BrandSmith, See: http://plasticpipe.org/pdf/chapter-6_installation_construction.pdf If it not clear, then call some mfg. I hope this helps

Nissmurano, For sewage you will use a submersible grinder pump : http://www.flygtus.com/ http://www.gouldspumps.com/download_files/HSU/Bsubmersible.pdf But there are not B73.2, since pump B73.2 features desing are not more recommendable for sewage aplication. But if you have some fluid...

AKVS24, You will use the chart or you will use polinomial form to calculate those correction factors. Polinomial form are publisehd on: http://www.warrenpumps.com/brochures/Fluid%20Viscosity%20Effects.PDF In industrial centrifugal pump, corrections factor will be negligible for lower values...