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chilled water system ring line 1

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hollandhvac

Mechanical
Feb 23, 2007
120
I have been asked to design a chilled water system ring line to connect 5 dry condesors to a cold water system comming from a low loss header. The ring line seems to have advantages over one single line with brach connections to the condensors. It also seems that pipe parts can be replaced qwithout having to stop the unit, by placing them in the correct position. Can some body tell me more about thesa advantages and where to put the valves.

Thanks
 
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What is a ring line? in the Us, I've never heard of this term.
 
A ring line is maybe literly translated. What it is, a piep that is going a round in a circul to connect all the accu together on one pipe line. But this pipe line can break in the middle and the chilled water can stil be transported to teh accu's but than flow through both sides of the ring. Take for example the ring line is connected to one supply and 4 units are connected. If the pipe starts leaking between say unit 2 and 3 than unit 1 and 2 get supplyed throuhg the one side of the ring and unit 3 and 4 get supplyed through the other side of the ring.

For the return line there is also a ring for the same purpose. Well Maybe I have answered my own questin now, but if somebody could confirm and add to it would be nice.
 
I am not sure if I understand exactly what you are talking about but it sounds like there could be a problem of having mixing water and different water temperatures entering the sequenced ACCU's ( air cooled condensing units?)

Generally chilled water systems are fairly indestructible unless you are worried about terrorist attacks, atom bombs and earthquakes. There could be a lot of expense for extra piping and valves which never would pay a benefit.
 
We call that a closed loop system.
You will need to maintain the main pipe size in order to feed from both sides, watch you water velocities at the end of the loop (where the two sides meet). Velocities will be so low, you get laminar flow and thus cannot remove air from system, keep water velocity above 1.5 Feet per second.

Why are you doing a closed loop?
 
This is done for maintenance purposes, to replace parts of the pipe when corroded I guess. It was instruction of boss to do so
 
Placement of valves will depend on redundancy you have in the system.

If all coolers are to remain operational and you want to be able to isolate any section of the ring main you will need to located an isolation valve on either side of each cooler take off.

It is an expensive method but if the system operation is critical or need to allow for future expansion then it works well.
 
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