Wanted: Multi-Stage Pump

Hello

Have you a technical specification for this pump? Is not a difficult application. Send me this spec to find the right pump.

The motor voltage is a bit unusual. Other than that, there should be any number of pump suppliers ready to assist. It's a bit of a biggie as regards power consumption at around 0.5MW, and it may be that a higher voltage motor is preferable. The starting gear for it will be an interesting exercise too.

As per your 70-90 lps, the pressure drop in the piping will be about

8 - 13m /100m = 44 - 71.5 m over 550m length

http://www.engineeringtoolbox.com/pressure-loss-steel-pipes-d_307.html

(for 6" line)

So you need a head generated say 450+71.5 = 521.5m assuming this is the head that you need and not the vertical head - else add the pressure you need at outlet side.

That makes it about 52 bar

http://www.lenntech.com/unit-conversion-calculator/pressure.htm

Now you have to get hold of a pump that has these characteristics.

And yes the power at just below 500KW seems to be a bit high.

it is worthwhile considering enhancing delivery pipe diameter to reduce friction loss; this will have reduced power demand resulting in motor of lesser kilowattage; this also means reduced recurring expenses in power bill. the most important of all - your equipment's carbon footprint will reduced - a great environmental initiative.

yes: you will need a multistage pump for this head or hook up two pumps in series; best is to consult a manufacturer or a technically competent manufacturer's rep.

What is "raw water"? Is that like "sweet water"?

This is underground water.

raw water is unfiltered water as it is sourced from borewell, river, pond, stormwater etc

Pumps this large tend to be fairly specialized for the particular service they are used in. If you are a serious potential buyer of a new pump for this service then you are best advised to contact one of the large established pump manufacturers.

Sulzer, KSB, Flowserve, Goulds, Clyde, Flowchem are all big names worth contacting for this type of multistage centrifugal pump. These pumps are usually in what is called a "barrel pump" configuration for horizontal above ground installations. A common application is as a boiler feed pump for a large electric generating station. There are also large deep well multistage pumps that have similar configurations and performance; but are packaged for vertical mounting in a well casing with a vertical shaft motor or a horizontal shaft internal combustion engine and right angle gearbox at ground level.

When you talk to a sales engineer or an application engineer you will be asked for a lot more information on the proposed pump installation and service than you have chosen to give us here. Best be ready for that.

Ed Weldon

We can do that with a verticle turbine pump

and you can have it in pretty much any material you want.

A proper spec would be appreciated and any required specs that need apply combined with certs required

GreatSage -- Way back when I worked at Worthington Pump (yup, 1963 and a bit later) the folks that built the vertical turbine pumps were in another division, so I never got close to them. I've always had the impression that if the application and especially the siting of the pump was right an electric driven high pressure high flow water pump was less expensive in total cost as a vertical turbine design than a horizontal pump particularly the horizontal split case types. Horizontal barrel pump designs were not all that popular at the time. What's the real world view today?

Ed Weldon

Ed

Good to hear from you. There is a lot of misconception about pumps and all I can say is that in truth I do supply a lot of VT pumps over between bearings or Horizontal split case. When you were with one of the proper pump companies that over engineered pumps so that they are still going many years on without much fuss, that concept is alien today. The VT pump has a much better rage on high head applications than that of a Split case Horizontal which are predominantly high volume movers. However Ed the cost of the VT pumps is high $50k cheapest I have supplied. The thing is that you can't get a horizontally mounted pump that will reach the high head applications that the VT pump will achieve.

regard