§ 13.38. Safety equipment.

 (a)  Safety relief valves of a type designed for use with liquefied petroleum gas shall be provided on all tanks. They shall be of a design and construction generally acceptable to good practice in the industry. They shall be set to relieve at the designed maximum working pressure of the vessel, except that for tanks built with a safety factor of five, they may be set to relieve at not more than 125% of such pressure. They shall be connected directly to the vapor space, and marked as required by §  3.144 (relating to marking).

 (b)  Excess or back flow check valves shall be required on all tank openings except for the following:

   (1)  Safety relief valve connections.

   (2)  Openings which are smaller than No. 54 drill size.

   (3)  Service line connections on tanks of 2,000 or less gallon capacity if they are equipped with reducing regulators.

 (c)  The valves described in subsections (a) and (b) shall close automatically at the rated flow of vapor or liquid as specified by the manufacturer. The connections or lines including valves, fittings, or other attachments being protected by the excess flow valve shall have a greater capacity than the rated flow of the excess flow valves. Means shall be provided to allow equalization of pressures.

 (d)  Check valves of suitable type shall be installed on the intake connection of every tank.

 (e)  Excess flow and check valves when required by the provisions of this Subchapter shall be located inside the tank, or at a point outside where the line enters the tank.

 (f)  All connections to tanks, when it is practicable, shall have shutoff valves of the quick-closing type. They shall be located at the tank except for the following:

   (1)  Safety relief valve connections.

   (2)  Liquid level gauging devices.

   (3)  Plugged openings.

   (4)  Pressure gauge openings.

 (g)  The requirements of subsection (f) of this section do not prohibit installation of a relief valve manifold assembly if the manifold and valves are so arranged that adequate relief valve capacity is always connected to the vapor space of the tank.

 (h)  Each tank with over 2,000 gallons water capacity shall have a suitable pressure gauge connected directly to the vessel. The dial of such gauge shall be graduated to at least 1 1/2 times the pressures at which the relieving device is set to function.

 (i)  Every tank, except those filled by weight, shall be equipped with a liquid level gauging device. Such gauging device shall be arranged so that the maximum liquid level is readily determinable. Gauging devices shall be designed to withstand a working pressure of at least 250 pounds per square inch.

 (j)  An effective relief valve shall be installed on the low pressure side of the regulator, and it may be an integral part of the regulator.

   This section cited in 34 Pa. Code §  3.12 (relating to frequency of inspection); and 34 Pa. Code §  13.4 (relating to scope).