Abstract
This specification covers requirements for multilayer pipe type 2 and compression fittings for hydronic heating systems. Multilayer Pipe Type is a construction-based pressure rated pipe comprising more than one layer in which at least 60 % of the wall thickness is polymeric material. Multilayer pipe type 2 is produced using a butt-welded aluminum pipe as a core, with an extruded inside layer of crosslinked polyethylene (PEX). An adhesive layer is used to bond the inside layer to the wall of the aluminum pipe. An outer layer of polyethylene (PE) and an adhesive layer are extruded to the outer wall of the aluminum pipe. Materials shall be tested and shall conform to specified values of multilayer pipe configurations 1 and 2, compression fittings for multilayer pipe, O-rings, multilayer pipe dimensions, compression fitting dimensions, minimum burst pressure, sustained pressure, thermal cycling test, and excessive temperature/pressure capability. Among the test methods included are: sustained-hydrostatic-pressure test, thermal cycling test, water hammer test, delamination, fusion line test, and excessive temperature/pressure capability test.
Scope
1.1 This specification covers requirements for multilayer pipe type 2 and compression fittings for hydronic heating systems, with a maximum pressure/temperature range of 1000 kPa (145 psi), at 82°C (180°F).
Note 1Multilayer Pipe Type 2-Construction-based pressure rated pipe comprising more than one layer in which at least 60 % of the wall thickness is polymeric material.
1.2 Multilayer pipe type 2 is produced using a butt-welded aluminum pipe as a core, with an extruded inside layer of crosslinked polyethylene (PEX). An adhesive layer is used to bond the inside layer to the wall of the aluminum pipe. An outer layer of polyethylene (PE) and an adhesive layer are extruded to the outer wall of the aluminum pipe.
1.3 Multilayer pipe type 2 is produced in Configurations 1 and 2, as shown in Fig 1.
1.4 This specification includes compression fittings, which are referenced in Fig. 2.
1.5 Specifications for threaded or solder adapters for use with pipe and fittings meeting the requirements of this specification are given in Annex A1 and Annex A2.
1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.
Note 2Multilayer pipe type 2, configurations 1 and 2, for hydronic heating systems are not compatible for drinking water use.
