2 replies to this topic

[Afshin445]

Dear Experts,

I am working in a modification project which process is simple, an existing tank supplied with existing pump. I need to change the existing tank with new tanks with higher elevation (about 8 m more) so we need higher supply pump discharge pressure.Client proposed to we install a new buffer tank and booster pump so discharge pressure of booster pump should be enough to overcome tank elevation change.The question is how I can specify volume for buffer tank, is it any design criteria for required tank holding time upstream of booster pump? Can I am using pressure vessel instead of storage tank upstream of booster pump?

Best Regards
Afshin

Edited by Afshin, 05 August 2012 - 09:43 PM.

[cea]

Dear Afshin-

Firstly, I will request you to furnish your query with some background & simple sketch, as absence of which may not give you right answer.

Well, as understood by me, the scheme has an atmospheric tank storage at pump suction with existing pump delivering to its destination, which has now been elevated by 8 m. It is required to find out optimum solution to cater for this change. Please confirm my understanding.

Now, firstly note that for installing booster pump doesnot require any buffer tank & same can be installed inline. Secondly, since you have not mentioned flow rate, you need to collect information about availability of pump model, since rise in differential head is just marginal. In view of this, you may try following option.

1. Review the existing pump curve & check if bigger impeller size can fulfill the requirement & available pump model as well as motor is sufficient to accomodate the revise duty.

2. Check possibility of using higher rpm motor, which will definately rise differential head.

3. Reperform hydraulics to check whether there is margin on head & also check effect of increase in discharge pressure because of rise in elevation on flow & check if it is acceptable.

4. At last option, instead of installing booster pump, review possibility of changing existing pump itself.

Hope, this will help you.

[fallah]

Afshin,

Seems an in-line booster pump with differential head of around 8 m and same flowrate would meet your requirement without any need to buffer tank. Detail information along with a sketch can help us to submit more precise answer.

Fallah