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5503.3.1 Sizing.
Pressure-relief-device vent piping shall have a cross-sectional area not less than that of the pressure-relief-device vent opening and shall be arranged so as not to restrict the flow of escaping gas.
5503.3.2 Arrangement.
Pressure-relief-device vent piping and drains in vent lines shall be arranged so that escaping gas will discharge unobstructed to the outdoors and not impinge on personnel, containers, equipment, foundations and adjacent structures or enter enclosed spaces. Pressure-relief-device vent lines shall be installed in such a manner to exclude or remove moisture and condensation and prevent malfunction of the pressure relief device because of freezing or ice accumulation or other types of obstruction.
5503.4 Marking.
Cryogenic containers and systems shall be marked in accordance with FC 5503.4.1 through 5503.4.6.
5503.4.1 Identification signs.
Visible hazard identification signs in accordance with NFPA 704 shall be provided at entrances to areas in which cryogenic fluids are stored, handled or used.
5503.4.2 Identification of contents.
Stationary and portable cryogenic containers shall be clearly marked with the name of the cryogenic fluid contained therein. Stationary aboveground cryogenic containers shall be placarded in accordance with FC 5003.5 and 5003.6. Portable cryogenic containers shall be identified in accordance with CGA C-7.
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