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Subchapter 7. General Industry Safety Orders
Group 9. Compressed Gas and Air Equipment
Article 78. Safety Relief Devices for Compressed Gas Containers

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§4657. General.

(a) Compressed gas cylinders, portable tanks, and cargo tanks shall have pressure relief devices installed and maintained in accordance with Compressed Gas Association Pamphlets S-1.1-1963 and 1965 addenda and S-1.2-1963. Types of safety relief devices as covered by this section are designated as follows:

(1) Type CG-1: Frangible disc.

(2) Type CG-2; Fusible plug or reinforced fusible plug utilizing a fusible alloy with yield temperature not over 170o F, nor less than 157o F (165o F nominal).

(3) Type CG-3; Fusible plug or reinforced fusible plug utilizing a fusible alloy with yield temperature not over 220o F, nor less than 208o F (212o F nominal).

(4) Type CG-4: Combination frangible disc-fusible plug, utilizing a fusible alloy with yield temperature not over 170oF, nor less than 157o F (165o F nominal)

(5) Type CG-5: Combination frangible disc-fusible plug, utilizing a fusible alloy with yield temperature not over 220o F nor less than 208o F (212o F nominal).

(6) Type CG-7: Safety relief valve.

(7) Type CG-8: Combination safety relief valve and fusible plug.

(b) All safety relief devices covered by this section shall meet the design, construction, marking and test specification of the "Compressed Gas Association Safety Relief Device Standards Part I--Cylinders for Compressed Gases: S1.1-1963."

HISTORY

1. Amendment of subsection (a) filed 11-18-76; effective thirtieth day thereafter (Register 76, No. 47).

2. Editorial correction of subsection (a)(4) (Register 97, No. 23).

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