Certifications | Gas Risers
Gas Riser Certifications & FAQs
Frequently asked questions
Chicago Fittings Corporation certifies that all Sealastic™ Gas Fittings manufactured with integral stiffeners, when installed per Chicago Fittings installation instructions, will meet all applicable requirements defined under D.O.T. 192.238(b), ASTM D2513-99 Category 1, ASTM F1973, ASTM F1948-99a Category 1 and NFPA 54 (ANSI Z223.1).
Chicago Fittings Corporation certifies that all Sealastic™ Gas Fittings manufactured with loose stiffeners, when installed per Chicago Fittings installation instructions, will meet all applicable requirements defined under D.O.T. 192.238(b), ASTM D2513 Category 1, ASTM F1973, ASTM F1948-99a Category 1 and NFPA 54 (ANSI Z223.1). The loose stiffeners must be manufactured or approved by Chicago Fittings to adhere to these requirements. Should a stiffener not be manufactured or approved by Chicago Fittings, it will be the responsibility of the operating utility or end user to assure they adhere to the above defined standards.
3.1 Bodies |
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3.2 Nuts |
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3.3 Seals | 3.3.1 Seals shall be manufactured from a Buna-N compound material that will resist deterioration from age or air under normal storage conditions. The seal will resist deterioration from impurities normally found in natural gas including odorants, liquid hydrocarbons, carbon dioxide and water. The compound shall meet the following specifications:
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3.4 Ferrules | 3.4.1 Cold Rolled Strip C1050 |
3.5 Insulators | 3.5.1 Zytel 105 |
3.6 Conduit |
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3.7 Moisture Seals | 3.7.1 Hot Dipped Vinyl |
Sealastic™ Fittings for natural gas as a standard are provided with a bottoming nut design denoted with an “M” designation at the beginning of the part number. This means that no measurement of torque or turns is required. Tighten the nut to a positive stop (metal-to-metal) with the shoulder of the fitting. In cases where bottoming nuts are not provided use the following torque recommendations:
IPS Size Wrench Size ½” 14" ¾” 14" 1" 16" 1 ¼” 18" 1 ½” 24" 2" 24"
In each case a pull of approximately 75 lbs. should be applied to the end of the wrench. When pipe movement out of the coupling or fitting may occur, proper anchorage of the pipe must be provided.