RE: Chilled Water Supply Header Connection

From: <Steve>
Date: Tue Jan 27 2004 - 23:18:00 EST

I am not aware of a normal practice for the entry points. The major factors driving the connection point are, from my perspective:
*minimum bends/section changes
*serviceability of valves, expansion joints etc
*arrangements to collect surface condensation
*location of header
*minimisation of system volume and surface area

If you are using chillers with low pressure circulation Ch-W pumps (i.e additional higher pressure zone distribution pumps to deliver cooling to the users) it will pay to take some care in the suction and discharge header arrangements so each chiller sees an equal pressure drop. Failure to do this can cause difficulties in load balancing - the chiller with the lowest pressure drop will get the highest flow and will try to do most of the work.

Cheers

Steve

-----Original Message-----
From: cs_ang [mailto:csang88@pd.jaring.my] Sent: Wednesday, January 28, 2004 3:23 PM To: PipingDesign@yahoogroups.com
Subject: [PipingDesign] Chilled Water Supply Header Connection

I am working on a project which involve installation of a central chilled water plant. There are 3 nos water chillers each of 750RT to be connected in parrallel to a supply pipe header. My question is what is the normal pratice to connect the chiller (chilled water) outlet pipes to the header:-

1) At the bottom of main header or
2) At the side of main header or
3) At the top of main header

and why.
Regards,
CSAng

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