Covers Performance Requirements and Details Comparisons The Plastics Pipe Institute, Inc. (PPI) recently announced the publication of a new document that provides the technical basis for comparing PE 100-RC to PE4710 pressure pipe. Called PPI TN-68, Historical Review of the PE 100-RC Concept – How PE4710 Compares to PE 100-RC, it will provide a perspective Read more
Plastics Pipe Institute
Covers Performance Requirements and Details Comparisons
The Plastics Pipe Institute, Inc. (PPI) recently announced the publication of a new document that provides the technical basis for comparing PE 100-RC to PE4710 pressure pipe. Called PPI TN-68, Historical Review of the PE 100-RC Concept – How PE4710 Compares to PE 100-RC, it will provide a perspective on the Slow Crack Growth (SCG) resistance requirements for the PE 100-RC designation in comparison with the North American PE4710 designation. This publication offers a common basis and understanding to industry. PPI is the major North American association representing the plastic pipe industry.
“The PE 100-RC concept has been around since 2009,” stated Patrick Vibien, P.Eng., technical director, PPI, “but there is a lack of clarity to the implications of the designation and a lack of consensus on whether a comparable designation has value for the North American industry given the already elevated SCG resistance requirements of PE4710. The development of the PE 100-RC designation was not due to documented performance issues with PE 100. This grade designation has been promoted internationally by the PE 100+ Association and is now being introduced into ISO and CEN standards. Although PE compounds are fairly similar, the test methods and requirements for assessing the performance of the designations differ significantly. Our new document goes into detail about this plus provides a comparison chart and other data that can be helpful and useful.”
TN-68 can be found on the Technical Notes page of the PPI website www.plasticpipe.org.
New Technical Document and Details Proper Steps for Use A new technical document that addresses techniques for the safe and proper use of spray polyurethane foam insulation on and around plastic pressure pipe materials has been published by the Plastics Pipe Institute, Inc. (PPI) with input from the Spray Polyurethane Foam Alliance (SPFA). Prepared by Read more
New Technical Document and Details Proper Steps for Use
A new technical document that addresses techniques for the safe and proper use of spray polyurethane foam insulation on and around plastic pressure pipe materials has been published by the Plastics Pipe Institute, Inc. (PPI) with input from the Spray Polyurethane Foam Alliance (SPFA).
Prepared by PPI’s Building & Construction Division, PPI TN-69 Recommendations when Applying Spray Polyurethane Foam Insulation on and around Plastic Pressure Pipes & Fittings discusses the proper application of spray polyurethane foam insulation to avoid damage due to heat generated by the foam. Pipe and fitting materials include CPVC, PEX, PEX/AL/PEX, PE-RT, PP-R, PP-RCT, PSU, PPS, PPSU, and PVDF.
PPI and SPFA recommend that when there are plastic pipes and fittings in a wall, ceiling, or floor cavity, the SPF installer should apply one layer of foam until it touches the pipe but does not encase the pipe. SPF installers should let the first layer of foam cure for a sufficient amount of time while heat is released from the foam and the pipe remains partially exposed before installing the second layer of foam. These procedures are described in detail within PPI TN-69.
Plastic pressure pipes and fittings are commonly used in applications such as hot- and cold-water plumbing, fire protection, and hydronic heating and cooling systems, including radiant distribution systems. In certain instances, pipes and fittings are installed inside areas that must be insulated, such as within a ceiling or wall cavity. In other installations, the pipes and fittings themselves must be insulated to reduce the transfer of heat through the pipe wall.
According to the SPFA, Spray Polyurethane Foam, or SPF, is a high-performance insulation material commonly used in homes and buildings of all types, and has been used as insulation for decades.
“The spray polyurethane foam curing reaction is exothermic,” explained Richard Duncan, Ph.D., P.E., executive director of SPFA, “which means that heat is generated during the foam reaction. The heat of reaction is highly dependent on the SPF formulation and is also based upon the overall intended application or lift (i.e., layer) thickness installed. Peak temperature within the layer of foam typically occurs within 5 to 15 minutes of application, followed by gradual cooling.”
According to SPFA documents, the chemical reaction that takes place during the application and curing of SPF will generate exothermic temperatures above the 120°F – 130°F setpoint temperatures of the proportioner and hoses. Peak temperatures at the mid-thickness of a pass can exceed 200°F for several minutes and reach peak temperatures 250°F – 275°F for a minute or two, especially for closed-cell SPF, when applied at the maximum pass thickness.
“Plastic pipes and fittings in both residential and commercial plumbing, residential fire protection, and most hydronic applications are typically required to have pressure ratings at 180°F (82°C) operating temperature,” explained Lance MacNevin, P. Eng., director of engineering for PPI’s Building & Construction Division.
MacNevin continued, “The plastic pipes and fittings referenced in PPI TN-69 will withstand short-term exposure to temperatures above 180°F. However, exposure to temperatures above the rated operating temperature of each material, which may occur if pipes are encased in a thick pass of closed-cell SPF, are likely to have negative effects on these materials, potentially leading to premature failure. It is important that SPF insulation is installed correctly to prevent overheating of pipes and fittings.”
Access the full content of PPI TN-69 at https://plasticpipe.org/common/Uploaded%20files/Technical/TN-69/PPI%20TN-69.pdf or by scanning:
Additional information and data about pressure pipe materials used for plumbing and mechanical systems are available from the PPI Building & Construction Division at www.plasticpipe.org/buildingconstruction