Tyco Blazemaster has this information in their IH1900 handbook starting on page 30. You can access the Installation Instructions on CPVC via the Tyco Fire website.
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From: Sprinklerforum [mailto:[email protected]] On Behalf Of Hinson, Ryan Sent: Friday, June 09, 2017 4:46 PM To: [email protected] Subject: RE: CPVC Piping I’d argue that the EOR, designer, and installer should be aware of and account for this possibility. CPVC manufacturers do provide this information. For instance, Harvel Plastics, Inc. HFS-3 CPVC Fire Sprinkler Piping Products Installation Instructions dated 1/1/09, provides the following direction: - Thermal Expansion: HARVEL® CPVC Fire Sprinkler Products, like all piping materials, expand and contract with changes in temperature. The coefficient of linear expansion is 0.000034 inch/inch °F. A 25°F change in temperature will cause an expansion of 1/2 inch for a 50 foot straight length. For most operating and installation conditions, the effects of thermal expansion and contraction are usually absorbed by the system at changes in direction in the piping. However, long straight runs of piping are more susceptible to experiencing measurable movement with changes in temperature (i.e. pipe installed in unheated building during the winter, then brought under heat as construction progresses). The installation of expansion loops, off-sets, or bends is required on long straight runs to compensate for this movement. This will allow the piping system to absorb forces generated by expansion/contraction without damage. For Additional Thermal Expansion information, please refer to Tables III and IV in the Reference Tables section. - It has the following to say regarding Trenching Snaking of Pipe: After CPVC pipe has been solvent welded, it is advisable to snake the pipe according to the following recommendations beside the trench during its required drying time. BE ESPECIALLY CAREFUL NOT TO APPLY ANY STRESS THAT WILL DISTURB THE UNDRIED JOINT. This snaking is necessary in order to allow for any anticipated thermal contraction that will take place in the newly joined pipeline. Snaking is particularly necessary on the lengths that have been solvent welded during the late afternoon or a hot summer’s day, because their drying time will extend through the cool of the night when thermal contraction of the pipe could stress the joints to the point of pull out. This snaking is also especially necessary with pipe that is laid in its trench (necessitating wider trenches than recommended) and is backfilled with cool earth before the joints are thoroughly dry. (There is a loop offset per temperature variation table given in this section which provides the needed for 20, 50, and 100 ft for temp deltas of 10° though 100°F in 10° increments. The snaking concept can be used above grade to accommodate anticipated thermal expansion/contraction once the system’s ambient environment becomes controlled and the corresponding temperature delta that exists between the two.) - Other Design Criteria: CAUTION When drilling holes in solid wood joists and in studs (wood or metal) to route the pipe the structural integrity must be maintained. Consult the Authority Having Jurisdiction (AHJ) or building code for requirements. When routing pipe through metal studs, holes drilled must be oversized to allow for movement caused by expansion and contraction. - Reference Tables Section: o Provides the following to determine change in length of due to thermal expansion or contraction and includes an example calculation: The change in length caused by thermal expansion or contraction can be calculated as follows: ∆L = 12 eL (∆T) e = 3.4 x 10-5 in./in. °F (Coefficient of Linear Expansion – Table II.) L = Length of Run in Feet ∆T = Temperature Change in °F (difference between lowest system temperature and maximum system temperature – whichever is greatest. o Tables III provides thermal expansion in inches o Table IV provides expansion loop length in inches In short, it is my believe that proper review of and attention to the manufacturer’s installation instructions prior to installation will provide you with the information necessary to install a system properly even when the installation temperature is significantly different than that of the finished product and that knowledgeable contractors can design the system so locations which should not move (sprinklers) – remain stationary in the temperature changes while the system is still allowed the necessary flexibility to expand or contract without exceeding manufacturers’ limitations. I would think that if one looks hard enough, one will find that all CPVC manufacturers provide similar guidance. Hope this helps, Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 952-656-3662 \ M 320-250-5404 \ F 952-229-2923 [email protected]<mailto:[email protected]> \ burnsmcd.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.burnsmcd.com_&d=DwMGaQ&c=0YGvTs3tT-VMy8_v51yLDw&r=wqvhudD2ES_7gVAKltUmDb2tUD5vBUC6ltMKFpmsAMU&m=a0q5qZqn_JW64xPqw7qwjmHYKPjP_VXxaw-BTpm_bcE&s=-ryjlXKYWjJaA4atTio6NOwuIyW7Kxz4YMkLVVEQtHM&e=> 8201 Norman Center Drive, Suite 300 \ Bloomington, MN 55437 *Registered in: MD, MN, PA, & TX **NICET IV - Water-Based Systems Layout From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ed Kramer Sent: Friday, June 09, 2017 1:18 PM To: [email protected]<mailto:[email protected]> Subject: RE: CPVC Piping I’ll throw in a twist – for those of us who live in either cold or hot climates. Had a CPVC system installed during the winter prior to the structure being heated (long cure time). After the heat was turned on, many of the recessed pendents shifted. I never visited the project, but I’m guessing there was significant stress put on the pipe at hangers, offsets, etc. Similar thing could happen if installed in really hot weather. Ed Kramer Bamford Fire Sprinkler From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mike Stossel Sent: Friday, June 09, 2017 12:52 PM To: [email protected]<mailto:[email protected]> Subject: RE: CPVC Piping I totally agree with you on all the points you made. The space is conditioned so the thermal expansion would be almost none existent. I could not find anything establishing an allowable limit, is it merely up to the installer to decide what the allowable expansion is? Mike Stossel SET [400dpiLogoCropped] 36 Barren Road East Stroudsburg, PA 18302 Office: 973-670-2627 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Hinson, Ryan Sent: Friday, June 9, 2017 1:43 PM To: [email protected]<mailto:[email protected]> Subject: RE: CPVC Piping What is your expected temperature delta? Since CPVC is installed in heated spaces, is there going to be that significant of a change in temperature? Where is the water supply coming from? In a conditioned space, CPVC piping system with no flow is going to have negligible thermal expansion IMO. Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 952-656-3662 \ M 320-250-5404 \ F 952-229-2923 [email protected]<mailto:[email protected]> \ burnsmcd.com<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.burnsmcd.com_&d=DwMGaQ&c=0YGvTs3tT-VMy8_v51yLDw&r=wqvhudD2ES_7gVAKltUmDb2tUD5vBUC6ltMKFpmsAMU&m=a0q5qZqn_JW64xPqw7qwjmHYKPjP_VXxaw-BTpm_bcE&s=-ryjlXKYWjJaA4atTio6NOwuIyW7Kxz4YMkLVVEQtHM&e=> 8201 Norman Center Drive, Suite 300 \ Bloomington, MN 55437 *Registered in: MD, MN, PA, & TX **NICET IV - Water-Based Systems Layout From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mike Stossel Sent: Friday, June 09, 2017 11:57 AM To: [email protected]<mailto:[email protected]> Subject: CPVC Piping I just recently had the question asked of me of, when do you need to install a thermal expansion loop in CPVC piping? I searched all of the manufacturers that I could think of and they all appear to say basically the same thing, in long straight runs of pipe. No one specifically defines what that length would be and likewise I could not find an allowable expansion amount. For instance an expansion of ½” or 1” is acceptable or at 1” expansion you will need one. I can understand not defining a specific length of run since each geographic area has different temperature changes which would affect the expansion, but I would have thought that they would define an expansion threshold. Any guidance that can be given would be greatly appreciated. Best regards, Mike Stossel SET [400dpiLogoCropped] 36 Barren Road East Stroudsburg, PA 18302 Office: 973-670-2627 [email protected]<mailto:[email protected]> ________________________________ This e-mail contains privileged and confidential information intended for the use of the addressees named above. If you are not the intended recipient of this e-mail, you are hereby notified that you must not disseminate, copy or take any action in respect of any information contained in it. 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