When attaching dissimilar metals you need to use DIELECTRIC ISOLATORS
1. Provide non-conducting dielectric connections wherever jointing dissimilar metals install approved factory fabricated isolator on piping systems. Epco Type GX or FX, Maloney Type E, or Capital Type CS or F.
2. Dielectric pipe fittings shall meet all requirements for tensile strength of the pipe fittings as listed in the Federal Specifications, Specification and Codes for the Plumbing Industry and ASME Engineering Specifications.
3. Unions shall be rated at not less than 250 psi. Fittings shall meet the Standards of ASA No. B16.8 ASME.
4. All plating shall comply with the Federal Specification.
5. The design of the union shall eliminate any flow restriction. The gasket shall be specifically designed for the project application.
6. The installation of the union shall allow for expansion and contraction.
7. Provide a Certificate that certifies that the dielectric union has been tested by an independent testing laboratory and meets WW-U-516B, ANSI-B-16.39, ANSI B2-1, and Class 1 ANSI-B1-20-1. 8. Submit unions for approval.
9. Provided isolating fitting in gas piping at each building entry, except where exterior gas main or branch is plastic.
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