Question 1

SECTION 1 – Integral Stiffener Design

Accepted Answer

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).

Question 2

SECTION 2 – Loose Stiffener Design

Accepted Answer

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.

Question 3

SECTION 3 – Material Definitions

Question 4

SECTION 4 – Torque Recommendations

Accepted Answer

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.

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Frequently asked questions

SECTION 1 – Integral Stiffener Design

SECTION 2 – Loose Stiffener Design

SECTION 3 – Material Definitions

SECTION 4 – Torque Recommendations