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Subchapter 7. General Industry Safety Orders
Group 20. Flammable Liquids, Gases and Vapors
Article 138. Hydrogen
(a) After installation, all field erected piping shall be tested and proved hydrogen gastight at operating pressure and temperature.
(b) Containers if out of service in excess of one year shall be inspected and tested as outlined in (a). The safety relief devices shall be checked to determine if they are operable and properly set.
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