jjmoore73
Mechanical
- Apr 13, 2011
- 30
We are installing a CPVC 13R system it has some straight runs almost 200 feet. Daytime temperatures when we are installing this week range from a high of 65 degrees today to a daytime high of 35 degrees next week. The pipe will eventually be in a controlled environment of 75 degrees. The expansion calculations are based on change in temperature and length of pipe and attached is an easy chart to show the expansion. It shows there will be .04" of expansion for 5' of pipe. Obviously 1/32" of expansion is nothing to be concerned with. What I want to know is, when expansion reaches "X" inches.... then expansion protection is required. Please define "X".
Possibly 1" or 2" is acceptable. Maybe anything more than 3" or 4" of movement needs to be addressed. I understand how to calculate the expansion, and know how to size the loop. What I don't understand is when it is necessary. I have asked the manufacture, they can only say how to calculate the expansion and how to size the loop. No one can tell me at what threshold it is necessary. I could not find anything in NFPA. Any suggestions?
Possibly 1" or 2" is acceptable. Maybe anything more than 3" or 4" of movement needs to be addressed. I understand how to calculate the expansion, and know how to size the loop. What I don't understand is when it is necessary. I have asked the manufacture, they can only say how to calculate the expansion and how to size the loop. No one can tell me at what threshold it is necessary. I could not find anything in NFPA. Any suggestions?