SPRAYFOAM Professional - Winter 2015 - (Page 45)

ask tHE ExPErt sPraying Foam on cPvc PiPE By spfa's ConsuLTanT CommITTEE: mason KnoWLEs, roGEr morrIson, pHIL roBarGE, JoHn HaTfIELD, roBB G. smITH, HEnrI fEnnELL S PFA gets calls regularly from customers, designers, architects and others looking for straight answers to their questions on SPF. Our panel of experts recently addressed this topic: Q uestion? My general contractor tells me that it would be a problem if I sprayed foam onto CPvC pipe. What is the real story? Can I spray it without having issues? A few years ago, a few contractors who installed CPVC pipe in houses thought that SPF could cause environmental stress fracturing of the pipes. It was thought that closed cell SPF might create too much exothermic heat and/or the fire retardants in SPF might be incompatible with CPVC resins. In response to the issue, SPFA systems house members, and Lubrizol (a leading supplier to CPVC resins) conducted a joint study that conclusively shows that sprayed polyurethane foam does not have a chemical compatibility issue and does not cause environmental stress cracking (ESC). This SPFA study included high-pressure, two-component open- and closed-cell SPF, as well as low-pressure, two-component closed-cell formulations using a wide range of halogenated flame retardants, which had been identified as a potential source of ESC. It should be noted CPVC pipes can be damaged from mechanical stress and the foam applicator should take all necessary steps to prevent any movement or stress to the pipe itself while working in proximity to pipes. A separate study by an SPFA-member systems house and Lubrizol concluded that both closed-cell and open-cell SPF may be applied to CPVC piping without damage caused by the SPF's exotherm (heat of reaction). Open- and closed-cell spray foams were applied to over 50 different pipe samples of Blazemaster® sprinkler pipes ranging from ¾" to 1½" diameter and Flow Guard Gold® plumbing pipes from ½" to 1"diameter. Pipes were tested: * Water-filled and dry (empty); * At internal pipe pressures in excess of typically seen in the field; * Using SPF thicknesses above recommended application rates. The study concluded that SPF may be applied to any CPVC pipe size, both standard plumbing and sprinkler types. When applying SPF to CPVC piping, SPFA recommends the following precautions: * CPVC piping should be depressurized during SPF application. * Closed-cell SPF should be applied using the manufacturer's recommended maximum pass thickness and minimum time between passes. * Open-cell SPF should be applied using the manufacturer's recommended maximum pass thickness. * When applying SPF around sprinkler heads, the sprinkler head should be masked to prevent SPF or overspray from entering and/or interfering with the operable parts of the sprinkler head. Full details of the ESC study can be found at the SPFA website www.sprayfoam.org and a Compatibility and Exotherm Position statement can be found on the Lubrizol website at: http://bit.ly/1LJNKww The California State Fire Marshal also issued a bulletin in May 2014 addressing concerns regarding the use of SPF in contact with CPVC piping: http://bit.ly/1LgP6QM o 774676_Spray.indd 1 www.sprayfoam.org | sprayfoam Professional 21/10/15 45 11:23 pm http://www.sprayfoam.org http://www.bit.ly/1LJNKww http://www.bit.ly/1LgP6QM http://www.spraypolyparts.com http://www.sprayfoam.org

Table of Contents for the Digital Edition of SPRAYFOAM Professional - Winter 2015

EXECUTIVE DIRECTOR’S CORNER
PRESIDENT’S POST
FOAM BUSINESS NEWS
SPFA TODAY
LEGISLATIVE UPDATE
SAFETY FIRST
Sprayfoam 2016 Convention & Expo – February 8-11, 2016
SPFA’s History Proves Our Perseverance
ABAA NEWS
SPF Research on Air Quality – PART 1
2015 SPFA CONTRACTOR AWARDS
MAKING MONEY: Paint Your Own Picture of Success
ASK THE EXPERT
UPCOMING EVENTS
INDEX OF ADVERTISERS

SPRAYFOAM Professional - Winter 2015

http://www.nxtbook.com/naylor/SPFQ/SPFQ0318
http://www.nxtbook.com/naylor/SPFQ/SPFQ0218
http://www.nxtbook.com/naylor/SPFQ/SPFQ0118
http://www.nxtbook.com/naylor/SPFQ/SPFQ0417
http://www.nxtbook.com/naylor/SPFQ/SPFQ0317
http://www.nxtbook.com/naylor/SPFQ/SPFQ0217
http://www.nxtbook.com/naylor/SPFQ/SPFQ0117
http://www.nxtbook.com/naylor/SPFQ/SPFQ0416
http://www.nxtbook.com/naylor/SPFQ/SPFQ0316
http://www.nxtbook.com/naylor/SPFQ/SPFQ0216
http://www.nxtbook.com/naylor/SPFQ/SPFQ0116
http://www.nxtbook.com/naylor/SPFQ/SPFQ0415
http://www.nxtbook.com/naylor/SPFQ/SPFQ0315
http://www.nxtbook.com/naylor/SPFQ/SPFQ0215
http://www.nxtbook.com/naylor/SPFQ/SPFQ0115
http://www.nxtbook.com/naylor/SPFQ/SPFQ0414
http://www.nxtbook.com/naylor/SPFQ/SPFQ0314
http://www.nxtbook.com/naylor/SPFQ/SPFQ0214
http://www.nxtbook.com/naylor/SPFQ/SPFQ0114
http://www.nxtbook.com/naylor/SPFQ/SPFQ0413
http://www.nxtbook.com/naylor/SPFQ/SPFQ0313
http://www.nxtbook.com/naylor/SPFQ/SPFQ0213
http://www.nxtbook.com/nxtbooks/naylor/SPFQ0113
http://www.nxtbook.com/nxtbooks/naylor/SPFQ0412
http://www.nxtbook.com/nxtbooks/naylor/SPFQ0312
http://www.nxtbook.com/nxtbooks/naylor/SPFQ0212
http://www.nxtbookMEDIA.com