Booster Pump Schematic

[Fayaz810]

Dear Friends,
Please see attached drawing
I am designing a job for an oil field where a water booster pump set will be installed.
It is a labor camp of 200 people with an elevated tank in a desert.
I have done loop and pressure calculations.
I just want to make sure, if my booster pump schematic is correct.
This pump will have two functions:
1) Boost water from elevated tank to water ring main
2) When tanker comes to the site, it needs to fill water from tanker to elevated tank

Please give me your remarks
Thanks in advance
Fayaz

 

[TD2K]

The file is not opening for me.

 

[LittleInch]

Nor me. Try the ,,,,or upload your file to engineering .com at the foot of the posting box and follow instructions carefully

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[Artisi]

Can't open.

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.)

 

[Fayaz810]

Dear Friends,
I uploaded the file again. Please look at the schematic

Regards
Fayaz

 

[bimr]

Some questions:

1. Do you have to maintain flow to the camp when you are filling the tank? The way that your system is set up will make that difficult. Your pump would have to be sized for the water transfer plus the camp demand.

2. Most pressure tanks are flow through instead of the dead leg design on your drawing. With a flow through tank, the water will stay fresher.

3. What is the purpose of the pressure reducing valve? You may not need it.

http://www.peerlessxnet.com/documents/tibs/TIB-101_Hydro-Pneumatic-Pressure-Systems.pdf

 

[LittleInch]

As with bimr, the issue to me is what that PRV is doing.

I think it would be better on the line to the tank as I would imagine this provides a much lower resistance to flow than the camp and if you're not exactly balanced, tyour pumps will just go off the end of the curve and trip when you try to fill the tank.

Otherwise in normal operation just run between your low and high pressure trips - after all that's what your tank T1 is doing. I would also think about a smaller pump to take account of the low flow situation otherwise your P1 and P" will start stopping and starting many times to charge T1 then get switched off by the high pressure pump. But maybe that's when you go to the bypass. We don't know what your supply flow looks like or when you need booster pumps (only during peak periods??) or all the time?

Apart from that it looks OK, but you shouldn't have two pumps next to each other both called #1...

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[chicopee]

The schematic looks good. I understand the PRV and could be a redundant item , however, I am a little confused about which tanks are the elevated and pressure boosting tanks as they s/b identified as such in your drawing; also on the sequence of operations, V6 s/b mentioned in the pressure boosting and by pass sections to eliminate all guesses by field people. I hoping that your tanker truck have vacuum relief valves or ambient openings because there could be a chance of collapsing the tank walls when water is being transferred and a note s/b made to that aspect of the sequence of operations. I suspect that a copy of this drawing will be available on site to be reviewed by people so you don't want anyone to guess.

 

[Xalii]

Usually you have two possibilities:
1) use a ground storage tank with a booster pump and a pressure vessel to smooth the flow and without PRV, in this way the water can be protected form the sun and would be cooler.
2) use an elevated tank with a gravity flow distribution (possibly with PRV), and a pump to fill in the elevated tank, good system too use if you are afraid of power cut.
Your system is a combination of the both and I can not really see any added value of it (more material & waste of energy). The main problem is the complexity of the operation with 4 valves and 2 pump to manipulate each time you want to fill-in your tank.
If you really want to make a redundant system, use one more pump to fill in the elevated tank but cancel the valve operations.

 

[afa13]

you mentioned that is an elevated tank, if so how much is its height?
the idea behind elevated tanks is to eliminate the need for a pump thus reducing costs.
however if u choose to go with the design u need to be more specific on some issues:
1) instead of suction from tank write discharge from elevated water tank
2) instead of tank fill mention which tank u mean and in case it is the T1 then u should show the piping connections
3)why do u need a prv?
4)what is the function of T1
5) as Xalii recommended u r better off with a ground storage tank with a high volume and a booster pump to fill the EWT
6) the pump numbering isn't correct

 

[dcasto]

How to you get water into the elevated tank? Your pumps only go to the camp. How Tallis the elevated tank? I've never seen a pump with a 49 foot NPSH. The whole system doesn't look big enough. Typically, unloading of water is in the 200 to 300 gallons per minute or less than 2 hours.