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siva1943
Active Contributor

Join Date: Mar 2009
Posts: 11

Temporary Bypass for Cooling System

03/04/2009 6:07 AM

we are asked to design a temporary bypass system for a cooling water system with a particular pressure drop and flow to suit a permanent piping for an utility which is not yet ready.the line size is 3000mm(10ft) id and the medium is water having a velocity of 3.2 metre/sec .the customer desires an orifice to be installed.the pressure drop is 1.7kg/cm2.

we are skeptical whether this is good system concidering the huge volume of flow,pressure drop and size.can there be any other practical solution? is it advisable to use a flow-restricting orifice for an unerected line.

thanks
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#1

Re: is it advisable to use a flow restricting orifice for a unerected line?

03/04/2009 8:22 AM

I don't see any particular problem in principle. Need to know a bit more about pipe layout, actual pressure etc. Orifice dia about 1600mm gives that sort of ΔP.

Cheers.......Codey

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siva1943
Active Contributor

Join Date: Mar 2009
Posts: 11
#2
In reply to #1

Re: is it advisable to use a flow restricting orifice for a unerected line?

03/05/2009 12:29 AM

many thanks for the comment.

please see some more detail,flow quantity 87500m3/hr,pr.upstream 4barg,downstream 2.34,matl GRP,velocity 3.4m/sec.

since it is a temperory arrangement,the layout is not yet finalised.mostly it will connected like an U loop from inlet to outlet with the orifice located in the temp. pipe.we are concerned about nearly 16tons of water moving at this velocity giving the initial impact on the orifice plate (GRP or STEEL?)and stabilising susequently.any comment on this concern of ours?

thanks
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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#3
In reply to #2

Re: is it advisable to use a flow restricting orifice for a unerected line?

03/05/2009 4:15 AM

Hello Siva

More detailed calc with new figures gives orifice dia 1.6m with pressure recovery, 1.51m without. Pressure recovery is increase in pressure some distance downstream of the orifice over pressure just after. Needs several pipe dias for full recovery, so depends on layout details.

Ref initial impact, you wouldn't start up with no water in the system and then start flow at 3.4 m/s, or you'd have big problems. You'd need to fill with water, release air from the system, and then gradually increase flow. How this is done clearly also depends on layout details.

Cheers......Codey

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siva1943
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Join Date: Mar 2009
Posts: 11
#4
In reply to #3

Re: is it advisable to use a flow restricting orifice for a unerected line?

03/05/2009 5:32 AM

thanks a lot for your help and the comment on the start up.
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