The following subdivisions, (1) to (26) of this section, inclusive, apply to the construction and assembly of tank trucks used for transportation and delivery of liquefied petroleum gases:

1. (1) Blueprints of the design of all containers to be used on delivery and transport trucks, showing location of pump, meter, fittings, baffles, piping arrangement, mounting details, etc., shall be submitted to the Liquefied Petroleum Gas Board for approval before the container is constructed;

2. (2)

   1. (A) Each container to be mounted on a delivery truck, transport, or trailer shall be:

      1. (i) Equipped with suitable baffle plates; and
      2. (ii) Attached in such manner as to allow for any expansion or contraction of shell plates under internal pressure due to any out-of-roundness.
   2. (B) All containers used for transportation and delivery of liquefied petroleum gases shall have the safety valves installed in the top center line of the container shell, and when of the external type, they shall be recessed to a sufficient depth that no part of the valves will extend above the shell of the container.

   3. (C)

      1. (i) The safety valves shall have direct communication with the vapor space of the container.
      2. (ii) The safety valve recesses shall be protected from rain and snow with a loose-fitting cover.
      3. (iii) Provisions shall be made to prevent the covers from being held down against the recesses, thus obstructing or decreasing the flow rate of the valve in the event a truck overturns and comes to rest on the top portion of the tanks.

   4. (D) If internal type valve is used, the sump or recess may be eliminated provided that the:

      1. (i) Distance between the top of the tank shell and the highest point of the valve does not exceed two and one-half inches (2 1/2"); and
      2. (ii) Valve is fully protected by a metal ring of not less than three-eighths inch (3/8”) plate material.
   5. (E) All safety valves must have sufficient relieving capacity as required by the National Fire Protection Association for the size tank on which they are to be installed;

3. (3)

   1. (A) Adequate protection consisting of a permanent fixture without hinges shall be provided for all fittings extending above the shell of the container.
   2. (B) Fittings shall not be installed in the ends of the tank between the tractor and the tank on trailers and semitrailers but shall be located at the rear or the bottom portion of the container at a distance from the front of the container of not less than one-third (1/3) the length of the container.
   3. (C) Fittings such as liquid level gauges (rotary or float), fixed outage gauge, pressure gauge, and thermometer may be located in the side of the container at a distance from the front of the container of not less than one-third (1/3) the container length, providing the fittings are recessed to the extent that no portion of the fittings extends beyond the outer surface of the shell or recess;

4. (4)

   1. (A) All piping shall:

      1. (i) Be installed in a straight line as nearly as possible with a minimum amount of pipe; and
      2. (ii) Not be restricted by an excessive amount of elbows and bends.
   2. (B) The piping between the excess flow valve and the pump shall not be reduced in size.
   3. (C) The pipe must be of the same size as the outlet of the excess flow valve.

   4. (D) All piping, tubing, and fittings shall be:

      1. (i) Securely mounted and protected against damage and breakage; and
      2. (ii) At least extra heavy to the first hand shutoff valve.

   5. (E) All piping shall be at least extra heavy (Schedule 80) if joints are:

      1. (i) Threaded; or
      2. (ii) Threaded and back welded.

   6. (F) At least single strength (Schedule 40) shall be used if joints are:

      1. (i) Welded; or
      2. (ii) Welded and flanged;
5. (5) Fittings located on the bottom of tank trucks, trailers, and semitrailers shall be adequately guarded and protected from mud and other foreign objects that might be thrown from the roadbed;

6. (6)

   1. (A) Twin or multiple installation of tanks on trucks, trailers, and semitrailers shall have flexible connections installed in the liquid and vapor manifolds between the tanks.
   2. (B) All trucks equipped with a pump shall have a flexible connection between the tank and pump, unless the pump is attached directly to the tank outlet by the use of a flanged connection welded to the container.
   3. (C) The flexible connection shall be of an approved type, and where hose is used for this purpose it shall consist of a hose with a minimum bursting pressure of not less than one thousand two hundred fifty pounds per square inch (1,250 psi).

   4. (D) There shall be etched, cast, or impressed on the hose at five-foot intervals, or on a name plate permanently attached thereto, the following information (see also 15 CAR § 270-111(i), the “Fit for Service” subsection regarding replacement name plates):

      1. (i) L.P.G.;
      2. (ii) Bursting pressure; and
      3. (iii) Manufacturer's name or trademark year of manufacture;
7. (7) All containers attached to delivery or transport trucks by the use of saddles with metal bands for holding the containers in place shall have belting or other fibrous, resilient material of not less than one-fourth inch (1/4”) in thickness installed between the tank and the cradle, or saddle, supports;

8. (8)

   1. (A) A safety relief valve shall be installed between each pair of shutoff valves on all liquid lines to relieve into a safe atmosphere any excess pressure that may exist.

   2. (B) The start-to-discharge pressure shall not be:

      1. (i) Less than four hundred pounds per square inch gauge (400 psig); or
      2. (ii) In excess of five hundred pounds per square inch gauge (500 psig);
9. (9) A hand shutoff valve shall be installed as close as possible to the tank on all liquid and vapor lines, and shall be easily accessible to the operator at all times;
10. (10) All manually operated valves on delivery and transport trucks shall be so located that the operator can close them conveniently;

11. (11) Metallic connections shall be made between:

    1. (A) Tank;
    2. (B) Chassis;
    3. (C) Axles; and
    4. (D) Springs;

12. (12)

    1. (A) Pumps of suitable design and properly protected:

       1. (i) Shall be provided for all liquefied petroleum gas containers used for delivery purposes; and
       2. (ii) May be driven by the truck motor power take-off or explosion-proof internal combustion engine, hand, hydraulic, or explosion-proof type electric motor.
    2. (B) The pump shall be equipped with suitable pressure actuated bypass valve permitting flow from pump discharge to pump suction before the pump discharge pressure rises above the safety relief valve setting of the tank being filled.
    3. (C) Pump discharge shall also be equipped with a spring-loaded safety relief valve, which shall be set to discharge at a pressure in excess of the setting of the pressure actuated bypass valve at the pump.
    4. (D) When pumps are mounted on containers for transport service, they shall be mounted in the same manner as those used for delivery purposes;
13. (13) The pump shall be mounted on the chassis of the truck or trailer at a location where it can be under the observation of the operator while being used;
14. (14) In all cases where the pump extends below the chassis of the truck, it must be adequately protected;

15. (15)

    1. (A) All trucks delivering liquefied petroleum gases for domestic use shall be equipped with a suitable measuring device which shall be used to gauge accurately the amount of gas placed in each system, either by meter or by weight.
    2. (B) When meters are used, they must be equipped with a constant differential back pressure valve, regardless of make of meter.
    3. (C) The spring setting on the valve shall be not more than fifteen pounds (15 lbs.);
16. (16) The bottom of all containers mounted on delivery and transport trucks in contact with the saddle supports shall be painted with at least two (2) coats of red lead, or its equivalent, before the containers are installed in the saddle supports;

17. (17)

    1. (A) All containers used for delivery and transport purposes shall be painted with white or aluminum paint, or any other light-colored paint with equivalent heat-reflective characteristics.
    2. (B) The word "FLAMMABLE" shall be painted in red letters at least six inches (6”) in height on both sides and rear of tanks.
    3. (C) This rule shall apply to all new installations and to containers now in service when tanks are repainted and relettered;
18. (18) Dealers shall be required to paint the name of their company, and a company number in letters not less than four inches (4”) in height on both sides of trucks and semitrailers;

19. (19)

    1. (A) A suitable stop or stops shall be mounted on the truck, semitrailer, or trailer, or on the container, in such a way that the container shall not be dislodged from its mounting due to the vehicle coming to a sudden stop.
    2. (B) Back slippage shall also be prevented by proper methods.
    3. (C) A suitable hold-down device shall be provided which will anchor the container at one (1) or more places on each side of the container to the truck, semitrailer, or trailer frame so as to minimize loosening caused by vibration;

20. (20)

    1. (A) Tank trucks, tank trailers, and tank semitrailers shall not be equipped with any artificial light other than electricity.
    2. (B) Lighting circuits shall have suitable over-current protection (fuses or automatic circuit breakers).
    3. (C) The wiring shall have sufficient carrying capacity and mechanical strength and shall be suitably secured, insulated, and protected against physical damage;

21. (21) Each delivery or transport truck shall be equipped with suitable:

    1. (A) Side lights;
    2. (B) Taillights; and
    3. (C) Stop light;

22. (22)

    1. (A) All trailers shall be firmly and securely attached to the vehicle drawing them by means of suitable drawbars.
    2. (B) Every trailer or semitrailer shall be equipped with a reliable system of brakes, and adequate provision shall be made for efficient operation from the driver's seat of the vehicle drawing the trailer.

    3. (C) Every trailer or semitrailer shall be provided with:

       1. (i) Side lights;
       2. (ii) Taillight; and
       3. (iii) Stop light.
    4. (D) Four-wheeled trailers shall be of a type of construction which will prevent the towed vehicle from whipping or swerving from side to side dangerously or unreasonably, but will enable it to follow substantially in the path of the towing vehicle;
23. (23) Where a fifth wheel is employed, it shall be ruggedly designed, securely fastened to both units, and equipped with a positive locking mechanism which will prevent separation of the two (2) units, except by manual release;

24. (24)

    1. (A) The exhaust system, including muffler and exhaust line, shall have ample clearance from the fuel system and combustible materials.

    2. (B) Truck muffler and exhaust pipe shall be placed as far as practicable from any:

       1. (i) Tank valves;
       2. (ii) Pumps; or
       3. (iii) Piping.
    3. (C) Muffler cutout shall not be used;
25. (25) Each tank truck and trailer shall be provided with properly attached metal bumpers or the chassis extension shall be so arranged as to protect the tank, piping, valves, and fittings in case of collision; and
26. (26) Tank trucks and trailers owned and operated by dealers holding permits and having previously been approved by the board may be allowed to remain in service, but in the event such truck tank or trailer is shopped for major repairs, it shall be equipped to meet all of the requirements of this State Liquefied Petroleum Gas Board Code.

Codification Notes: “L.P.G.” means liquefied petroleum gas.