Metal or Plastic Fittings Utilizing an Alternate Material

Transcription

1 NSF International Special Engineered Specification NSF SE 7956 Metal or Plastic Fittings Utilizing an Alternate Material The Public Health and Safety Company. TM

2 SPECIFICATIONS FOR A SPECIAL ENGINEERED (SE) PRODUCT NSF SE 7956 Metal or Plastic Fittings Utilizing an Alternate Material 1. Purpose: This specification defines the product specific requirements for Fittings manufactured with alloys or materials not currently referenced in ASTM PEX Fitting Standards for use with cross-linked polyethylene (PEX) tubing, which complies with ASTM F 876 / F Scope of Specification: This specification covers the required initial testing, marking, in-plant QC and annual testing requirements for Metal Fittings Utilizing an Alternate Alloy Plastic fittings using an alternate material for use with fittings that comply with ASTM PEX fitting Standards and cross-linked polyethylene (PEX) tubing that complies with F 876 or F Application: Plastics Insert Fittings and Metal Fittings Utilizing an Alternate Alloy or material certified against these requirements are authorized for use in cold (CLD 23 F), domestic hot (140 F), and commercial hot (180 F) Potable Water applications. Additionally, Plastics Fittings and Metal Fittings Utilizing an Alternate Alloy or material certified against these requirements are authorized for use in Radiant Heating applications. 4. Reference Documents: ASTM Standards: ASTM D 618 Practice for Conditioning Plastics for Testing ASTM D 1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure ASTM D 1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings ASTM D 1600 Terminology for Abbreviated Terms Relating to Plastics ASTM D 2749 Symbols for Dimensions of Plastic Pipe Fittings ASTM D 6778 Standard Specification for Polyoxymethylene (POM, Acetal) Molding and Extrusion Materials ASTM F 412 Terminology Relating to Plastic Piping Systems ASTM F 876 Standard Specification for ASTM F 877 Standard Specification for Crosslinked Polyethylene (PEX) Plastic Hot and Cold Water Distribution - Systems ASTM F 1807 Standard Specification Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubing ASTM F 1865 Specification for Mechanical Cold Expansion Insert Fitting with Compression Sleeve for ASTM F 1960 Specification for Cold Expansion Fittings with PEX Reinforcing Rings for Use with Cross-Linked Polyethylene (PEX Tubing ASTM F 1961 Specification for Metal Mechanical Cold Flare Compression Fittings with Disc Spring for ASTM F 1974 Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for Specification for Plastic Insert Fittings Utilizing a Copper Crimp Ring for Polyethylene /Aluminum / Polyethylene Tubing and Crosslinked Polyethylene /Aluminum / Crosslinked Polyethylene Tubing ASTM F 2080 Specification for Cold Expansion Fittings with Metal Compression Sleeves for Crosslinked Polyethylene (PEX) Pipe ASTM F 2434 Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Crosslinked Polyethylene (PEX) Pipe and SDR9 Crosslinked Polyethylene /Aluminum / Crosslinked Polyethylene (PEX AL PEX) Tubing This document is the property of NSF International. Page 2 of 5

3 ASTM F 2854 Standard Specification for Push-Fit Crosslinked Polyethylene (PEX) Mechanical Fittings for CSA B137.5 Crosslinked polyethylene (PEX) tubing systems for pressure applications NSF Standards: NSF/ANSI Standard 14 Plastic Piping System Components and Related Materials NSF/ANSI Standard 61 Drinking Water Systems Components Health Effects 5. Testing Requirements: 5.1 Workmanship Plastics Insert Fittings and Metal Insert Fittings Utilizing an Alternate Alloy or material certified against this document shall not, upon a visual inspection, contain imperfections that would interfere with the performance of the PEX system it is used with. 5.2 Dimensions, & Tolerances The dimensions, & tolerances of Plastics Insert Fittings and Metal Insert Fittings Utilizing an Alternate Alloy certified against this document shall meet the requirements specified in ASTM F 877 Section 6.2 and Section In cases where the size of the fitting falls outside the identified dimensional specifications of ASTM F 877, the dimensions shall be compliant with the manufacturer s specifications. In these cases, the manufacturer s dimensions shall follow the same tolerances identified in ASTM F 877 Sections Hydrostatic (Short-term) Burst Plastics Insert Fittings and Metal Insert Fittings Utilizing an Alternate Alloy certified against this document shall meet the short-term burst requirements specified in ASTM F 877 Section and Test temperatures shall be 73 F and 180 F. Testing shall be conducted per ASTM F 877 Section 7.6 and ASTM D Hydrostatic Sustained Pressure Strength Plastics Insert Fittings and Metal Insert Fittings Utilizing an Alternate Alloy certified against this document shall be tested for a hydrostatic sustained pressure test at 180 F. A minimum of six joints (fitting, & PEX pipe) shall be tested in accordance with ASTM F 877 Section 6.4 and Section 7.4, and Test Method ASTM D Thermocycling Plastics Insert Fittings and Metal Insert Fittings Utilizing an Alternate Alloy certified against this document shall be tested for 1000 cycles at 180 F. A minimum of six joints (fitting, & PEX pipe) shall be tested in accordance with ASTM F 877 Section 6.5 and Section Excessive Temperature Plastics Insert Fittings and Metal Insert Fittings Utilizing an Alternate Alloy certified against this document shall be tested for 720 hours at 210 F. A minimum of six joints (fitting, & PEX pipe) shall be tested in accordance with ASTM F 877 Section 6.7 and Section 7.7 and ASTM D Corrosion Resistance Metal fittings that are intended for use in Canada, shall require corrosion resistance testing in accordance with Clause of CAN/CSA-B Oxidative Stability in Potable Chlorinated Water Applications Fittings certified against this specification and produced from an Acetal material shall meet the Oxidative requirements of ASTM F2854 Section 8.4. After initial qualification, the fittings shall be tested at a minimum of once every three years. 5.9 Fittings and valves Fittings and valves made from copper alloys containing more than 15% zinc by weight shall be resistant to dezincification and stress corrosion cracking (SCC) and meet the following requirements: Dezincification resistance Sampling Three test specimens selected at random shall be conditioned to standard laboratory conditions of 73 +/- 3.6 o F (23 +/- 2 o C) prior to testing. Testing Test specimens shall be tested according to ISO 6509 Corrosion of metal and alloys Determination of dezincification resistance of brass. Requirements The maximum depth of dezincification shall not exceed 200 µm. Failure of one of the three specimens tested is cause for retest of three additional specimens. Failure of one specimen in the retest shall constitute failure in the test Stress corrosion resistance Sampling Three test specimens selected at random shall be conditioned to standard laboratory conditions prior to testing. Testing Test specimens shall be tested according to ASTM B858 Standard Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys or ISO 6957 Copper alloys Ammonia test for stress corrosion resistance in a test solution of ph 9.5. This document is the property of NSF International. Page 3 of 5

4 Requirements There shall be no evidence of cracking when viewed with a microscope with a minimum magnification of 10X. Failure of one of the three specimens tested is cause for retest of three additional specimens. Failure of one specimen in the retest shall constitute failure in the test. Note: The requirements for resistance to dezincification and resistance to stress corrosion cracking are intended to establish a minimum level of performance for products intended for use in potable water systems. These requirements are not a guarantee that erosion or corrosion will not occur. 6. Materials: 6.0 Material used in the production of Plastics Fittings and Metal Fittings certified against this requirement shall be per the manufacturer s specifications. 6.1 Acetal or POM materials shall meet a minimum cell class of B66450 when tested against the requirements specified in ASTM D Product Marking: 7.1 Marking on the Fitting Plastics Fittings and Metal Fittings Utilizing an Alternate Alloy certified against this document certified against this specification shall bear one of the following certification marks: The manufacturer s name or trademark shall be identified on the Plastics Fittings and Metal Fittings Utilizing an Alternate Alloy certified against this document. 7.2 Marking on packaging Marking on packaging shall include one of the following certification marks: Packaging shall also include the manufacturer s name and the size of the Plastics Fittings and Metal Fittings Utilizing an Alternate Alloy certified against this document Stainless Steel Pinch Clamp If present, Stainless Steel Pinch Clamps shall bear one of the following certification marks: Packaging shall also include the manufacturer s name and the size of the Plastics Fittings and Metal Fittings Utilizing an Alternate Alloy certified against this document. 8. In-plant Q.C. Requirements: The following tests are to be performed at start-up and designated frequencies thereafter and performed in accordance with Section 5 of this document. This document is the property of NSF International. Page 4 of 5

5 Test Frequency Burst pressure ** Dimensions Insert OD Body wall thickness Insert length Thread Gauge Thread length Wall thickness (insert) 24 Hours All other required insert dimensions Excessive temperature and pressure capability Annually Sustained pressure Annually Thermocycling Annually ** Metal fittings need only be tested annually for burst pressure. This document is the property of NSF International. Page 5 of 5