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# Pipe sizing exercise

## Pipe sizing exercise

(OP)
Does anyone have any thoughts to share on sizing a line for a chiller-to-air-cooled condenser unit piping run? Will be running R-22 refrigerant.

### RE: Pipe sizing exercise

I'd look at about 0.25 to 0.50 psi/100 foot.  If the line is short, look at keeping the velocity under 150 to 200 feet/sec.

That's sort of a resonable dP for gases and vapors.  It really comes down to how long is the line and what the effect of the extra line losses are to you in terms of chiller performance (likely to be minor) or compression/pump Hp somewhere in the system.

### RE: Pipe sizing exercise

I would recommend a discharge line pressure drop of 2-5 psi/100ft at normal condensing temperature, as it should not greatly effect the operating efficiency of your system.  For the liquid line between the condenser and receiver (or high-side float), I would use a velocity of 75 fpm for small pipe to 150 fpm for larger pipe.  An average of 100 fpm works well for sewer-type flow (assuming your condenser is above your chiller).  The value can be adjusted based on pipe geometry (NPS, elevation change, distance) and whether or not an external gas equalizing line is used.

### RE: Pipe sizing exercise

Graciano:
I'm in this affair since 30 years , please tell me the following.

Compresor TR or make and model.
Condenser make and model
Distannce from comp to condeser. horizontal an vertical and
The same for the pipe from condenser to expansion valve.

Your local medium summer temperature and max tem expected.

You can reach me at k281969@hotmail.com
but keep your post here for mutual benefits.
Pardal

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