PUMP SYSTEM TDH 1100 m, Q= 1020 m3/Hr

[VictorHernandez]

Dear
I have a new project for sea water of 1020 m3/hr and TDH, 1100 m, I thought of the design with two pump station (550 m each station)
and three pump in each station, but There are two alternative types of pumps to use, a) horizontal multi stage and b) Turbine vertical multi stage.
I would like to have your views on this type of pump considering costs and maintainability and operability.
I will be grateful if you have a similar application that can comment me

regards

Victor

 

[GHartmann]

I am never a fan of pumps in series unless there is no other solution.

It appears that the multi-stage vertical turbine pumps do not quite achieve your hydraulic coverage (Sulzer, Goulds, Ruhrpumpen, Flowserve)

I did find a between bearing BB3 multi-stage horizontal axial split case pump from Flowserve:

http://www.flowserve.com/Products/P...le-Case,-Axially-Split,-Multistage-Pump,en_US

Not sure the Sulzer or Ruhrpumpen can provide your coverage. It appears a similar model is available from Clyde Union

As far as the merits of vertical vs axial split, I will leave that to others. The vertical pumps always have the potential for shaft deflection and vibration whereas the between bearing pumps minimize any such problem.

Let us know what you choose,

 

[VictorHernandez]

Thank you GHartmann.

 

[BigInch]

Flowserve and Clyde Union will both have that head and flow capacity available for horizontals. I would agree with GHartmenn's suggestio.

you must get smarter than the software you're using.

 

[Artisi]

The selection is horizontal split case pumps - forget V.T. unless the intake demands this arrangement then you might well need low head VT units feeding into HSC units but would imagine that you will still need 2 pump stations equipped with HSC.
Suggest you contact the major pump companies with full design data, a little more detailed than what you have supplied to us - unless of course this is a "I wish" project and there isn't any design data available.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[VictorHernandez]

DEAR ARTISI
Could you please some more detail why should not think at vertical turbine,

Thank you

Victor

 

[DubMac]

Your head requirement is why I would not choose a vetical turbine. If you can even find one, it will be many stages and VERY long; that will come in to play on any repair as each stage will most likely have wear rings and bowl bearings reworked/replaced. Mucho $$. VTPs can become nightmares when running at 2 pole speeds with excessive stages (look at condensate can pumps in refinery service).

Horizontal multistage splitcase is probably your best option here. Even if you go with one pump you can easily meet the Conditions of Service. You are looking at probably minimum 36 weeks for one of these pumps; maybe as much as a year. I would look at one of the Big Boys for this pump: Sulzer, Goulds, Flowserve.

Probably should think about materials of construction before you get much deeper in to this. Your material selection will be critical to the reliability and life of the pump. The link below is to an excellent paper on seawater materials.

http://www.google.com/url?sa=t&rct=...F8YDKW5IHWznS5A&bvm=bv.82001339,d.eXY&cad=rja

 

[Artisi]

I would also look at Japanese manufacturers for pumps to suit.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[GHartmann]

Artisi:

Do you have any specific manufacturers in mind?

I know nothing about the Japanese suppliers

 

[Artisi]

GHartmann
Been away from the front end of the pump industry for a long time now - Mitsubishi comes to mind, maybe Hitachi - there were others but all a bit hazy on who's who now.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[sunloco]

It depends on your intake design, normally if suction pipe is not deep and okay for good NPSHa, I would recommend horizontal multi-stage pump. just as DubMAC said, it is easy to mantain or repair in future. if the seawater intake is deep, the better choice is probably vertical turbine pump. I make a rough selection in pump selection software. horizontal pump: 10X12-15,6 stgs, 300orpm, eff:82%, vertical turbine pump: 18" or 20", 6 or 7 stgs,3000rpm, eff:80-83%.

ITT Industrial process, Goulds Pumps

 

[GHartmann]

Sunlocco:

What Goulds models did you find? I could not find any that provided enough hydraulic coverage for the OP conditions

 

[TenPenny]

Frank Mohn is in this business, I would check them out.

http://www.framo.com

is their website.

 

[Pumpsonly]

Victor, You did not mention how is the setup.
Is it a pipe line installation where the head is mainly friction or a high pressure inject. If it is a long pipe line installation, where the head is mainly friction, 2 stations installation will required lower pressure piping and cost of the pipe line.

Vertical multistage pumps should be avoided unless there is NPSH problem or the intake design is suction lift arrangement.