Storage and Handling of Liquified Petroleum Gases §1910.110(b)(5), (11), (15); (c)(2); (g)(2), (12); (h)(3), (12)

Markings on Containers

Every container specified in Subpart H §1910.110(b)(3)(i)–(v) and containers used in LP-Gas system installations on commercial vehicles (§1910.110(g)) must be marked as follows:
  • With a marking identifying compliance with and other markings required by, the rules of the reference under which the container is constructed; or with the stamp and other markings required by the National Board of Boiler and Pressure Vessel Inspectors.
  • With notation as to whether the container is designed for underground or aboveground installation or both. If intended for both and different style hoods are provided, the marking shall indicate the proper hood for each type of installation.
  • With the name and address of the supplier of the container, or with the trade name of the container.
  • With the water capacity of the container in pounds or gallons, U.S. Standard.
  • With the pressure in p.s.i.g., for which the container is designed.
  • With the wording "This container shall not contain a product having a vapor pressure in excess of p.s.i.g. at 100°F." (see §1910.110(14)(viii)).
  • With the tare weight in pounds or other identified unit of weight for containers with a water capacity of 300 pounds or less.
  • With marking indicating the maximum level to which the container may be filled with liquid at temperatures between 20°F and 130°F, except on containers provided with fixed maximum level indicators or which are filled by weighing. Markings shall be in increments of not more than 20 °F. This marking may be located on the liquid level gaging device.
  • With the outside surface area in square feet.
  • Markings specified shall be on a metal nameplate attached to the container and located in such a manner as to remain visible after the container is installed.
  • When LP-Gas and one or more other gases are stored or used in the same area, the containers shall be marked to identify their content. Marking shall be in compliance with American National Standard Z48.1-1954, "Method of Marking Portable Compressed Gas Containers To Identify the Material Contained."

Vaporizer and Housing

Indirect fired vaporizers that use steam, water, or other means of heating have to be permanently marked as follows:
  • With the code marking that gives the specifications to which the vaporizer is constructed.
  • With the allowable working pressure and temperature for which the vaporizer is designed.
  • With the sum of the outside surface area and the inside heat exchange surface area expressed in square feet.
  • With the name or symbol of the manufacturer.

Loading or Unloading Points and Operations

When a tank car or transport truck is loading or unloading, a "TANK CAR CONNECTED" sign has to be installed at the active end or ends of the siding while the tank car is connected.

Cylinder Systems

Containers have to be marked according to DOT regulations. Additional markings that don't conflict with DOT regulations may be used.
  • Except as provided below, each container shall be marked with its water capacity in pounds or other identified unit of weight.
  • If a container is filled and maintained only by the owner or his representative and if the water capacity of each container is identified by a code, compliance with the above paragraph is not required.


DOT containers have to be marked, maintained, and requalified for use according to DOT regulations.
A permanent caution plate has to be provided on the appliance or next to the container outside of any enclosure. It has to include the word "CAUTION" and the following instructions, or instructions using basically the same language:
  • Be sure all appliance valves are closed before opening container valve.
  • Connections at appliances, regulators, and containers must be checked periodically for leaks with soapy water or its equivalent.
  • Never use a match or flame to check for leaks.
  • Container valves must be closed when the equipment is not in use.

Liquified Petroleum Gas Service Stations

All container inlets and outlets except those listed below have to be labeled to show whether they connect with vapor or liquid (labels may be on valves):
  • Safety relief valves.
  • Liquid-level gaging devices.
  • Pressure gages.
"NO SMOKING" signs have to be posted where the customer being served can see them. The letters on these signs have to be at least 4 inches high.

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