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Section FC 5501: General
Section FC 5502: Definitions
Section FC 5503: General Requirements
5503.1 Cryogenic container.
5503.1.1 Cryogenic container standards.
5503.1.1.1 Pressure gauges.
5503.1.1.2 Liquid level-indicating devices.
5503.1.2 Flood hazard.
5503.1.3 Foundations and supports.
5503.1.3.1 Temperature effects.
5503.1.3.2 Corrosion protection.
5503.1.3.3 Fill connection supports.
5503.2 Pressure relief devices.
5503.2.1 Cryogenic containers.
5503.2.2 Equipment other than cryogenic containers.
5503.2.3 Sizing.
5503.2.4 Accessibility.
5503.2.5 Arrangement.
5503.3 Pressure-relief vent piping.
5503.3.1 Sizing.
5503.3.2 Arrangement.
5503.4 Marking.
5503.4.1 Identification signs.
5503.4.2 Identification of contents.
5503.4.3 Identification of cryogenic containers.
5503.4.4 Identification of cryogenic container connections.
5503.4.5 Identification of piping systems.
5503.4.6 Identification of emergency shutoff valves.
5503.5 Container protection.
5503.5.1 Reserved.
5503.5.2 Securing of cryogenic containers.
5503.5.3 Securing of vaporizers.
5503.5.4 Physical protection.
5503.6 Electrical wiring and equipment.
5503.6.1 Location.
5503.6.2 Electrical grounding and bonding.
5503.7 Service and repair.
5503.7.1 Cryogenic containers.
5503.7.2 System inspection.
5503.8 Unauthorized use.
5503.9 Leaks, damage and corrosion.
5503.10 Lighting.
Section FC 5504: Storage
Section FC 5505: Handling and Use
Section FC 5506: LNG Installations and Facilities
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5503.3 Pressure-relief vent piping.
Pressure-relief vent-piping systems shall be constructed and arranged so as to remain functional and direct the flow of gas to a safe location in accordance with FC 5503.3.1 and 5503.3.2.
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.

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