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Chapter 53: Compressed Gases
Section FC 5301: General
Section FC 5302: Definitions
Section FC 5303: General Requirements
5303.1 Containers.
5303.1.1 Design and construction.
5303.1.2 Pressure relief devices.
5303.1.2.1 Where required.
5303.1.2.2 Size.
5303.1.2.3 Arrangement.
5303.1.2.4 Protection against freezing.
5303.2 Marking.
5303.2.1 Stationary compressed gas containers.
5303.2.2 Portable containers.
5303.2.3 Piping systems.
5303.2.4 Out-of-service containers.
5303.3 Container protection.
5303.3.1 Flood hazard.
5303.3.2 Physical protection.
5303.3.3 Securing compressed gas containers.
5303.4 Valve protection.
5303.4.1 Compressed gas container protective caps or collars.
5303.4.2 Caps and plugs.
5303.5 Separation from hazardous conditions.
5303.5.1 Incompatible materials.
5303.5.2 Combustible waste and vegetation.
5303.5.3 Ledges, platforms and elevators.
5303.5.4 Extreme temperature.
5303.5.5 Falling objects.
5303.5.6 Heating.
5303.5.7 Sources of ignition.
5303.5.8 Exposure to chemicals.
5303.5.9 Exhausted enclosures.
5303.5.10 Gas cabinets.
5303.5.11 Tube trailers.
5303.6 Wiring and equipment.
5303.7 Maintenance and alteration.
5303.8 Unauthorized use.
5303.9 Exposure to fire.
5303.10 Leaks, damage or corrosion.
5303.11 Protection against corrosion.
5303.12 Overhead cover.
5303.13 Lighting.
Section FC 5304: Storage of Compressed Gases
Section FC 5305: Handling and Use of Compressed Gases
Section FC 5306: Medical Gas Storage
Section FC 5307: Carbon Dioxide Beverage Dispensing Systems
Section FC 5308: Ethylene Oxide
Section FC 5309: Compressed Gases Not Otherwise Regulated
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5303.1.2.2 Size.
Pressure relief devices shall be sized in accordance with the specifications to which the container was fabricated and to material-specific requirements, as applicable.
5303.1.2.3 Arrangement.
Pressure relief devices shall be arranged to discharge upward and unobstructed to the open air in such a manner as to prevent any impingement of escaping gas upon the container, adjacent structures or personnel.
   Exception: DOTn specification containers having an internal volume of 30 SCF (0.855 m 3) or less.
5303.1.2.4 Protection against freezing.
Pressure relief devices shall be designed and installed to prevent moisture from collecting and freezing in a manner that would impair the operation of the device.
5303.2 Marking.
Stationary and portable compressed gas containers and systems shall be marked in compliance with the requirements of FC 5303.2.1 through 5303.2.4.
5303.2.1 Stationary compressed gas containers.
Stationary compressed gas containers shall be marked with the name of the gas in accordance with FC 5003.5 and 5003.6. Markings shall be visible from any direction of approach. All uninsulated stationary outdoor compressed gas containers shall be of light-reflective design or painted with a light-reflecting color.
5303.2.2 Portable containers.
Portable compressed gas containers shall be marked in accordance with CGA C-7 and DOTn regulations.
5303.2.3 Piping systems.
Piping systems shall be marked in accordance with ASME A13.1. Markings used for piping systems shall consist of the name of the contents and include an arrow indicating direction of flow. Markings shall be provided at each valve; at wall, floor or ceiling penetrations; at each change of direction; and at a minimum of every 20 feet (6096 mm) or fraction thereof throughout the piping run.
   Exceptions:
      1.   Piping that is designed or intended to carry more than one compressed gas at various times shall have appropriate signs or markings posted at the manifold, along the piping and at each point of use to provide clear identification and warning.
      2.   Piping within gas-manufacturing plants, gas-processing plants and similar occupancies shall be marked in an approved manner.

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