No, just like it doesn't prevent it from getting to freezing it won't prevent it from getting to 65 or what ever. What is does in a changing ambient is it slows the change in the thing that is insulated. It will get to 65 a little slower than the uninsulated pipe. The time depends on the insulation.
The other factor is how fast the temps are changing and how long they remain at the peak. If the temps are indeed going from 65 to 20 evenly over about 12 hours and back up to 65 over the next 12 hours you are right it probably won't ever get to 65 or 20. In my original example I tried to gloss over this issue for clarity. That's why I chose 20 and not 32. It won't get to 20 but we really don't care because it will fall below 32 which is when the problems start. Now if the temp profile is 65 to 20 in a few seconds and it remains at the peak for 12 hours then back to 65 in a few seconds it will probably reach the peaks with reasonably insulation. I imagine R 6000 and it still might not get there in 12 hours. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Garth W. Warren Sent: Thursday, April 15, 2010 10:06 PM To: [email protected] Subject: Re: Pipe Wrapping Chris, I question your findings. Won't the insulation prevent the water within the piping from gaining in temp during the 65 degree temp rise? It seems to me the long term consequence would be the same in either case. Of course I might just be using a cheaper calculator than you. Garth ----- Original Message ----- From: "Chris Cahill" <[email protected]> To: <[email protected]> Sent: Thursday, April 15, 2010 9:23 AM Subject: RE: Pipe Wrapping Well yes but. Insulation of non-flowing fluids in a pipe such as our systems will be aided by insulation but not in the way the insurance guy suggested. The insulation will slow the heat loss. So if I have two identical wet sprinkler pipes, one with insulation, one without, running through a cold space at say 65 deg F in the afternoon and the temp drops at night to say 20 deg F the one without the insulation will freeze first. The difference in time can be calculated. _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
