(a)

1. (1) The following applies to the construction, assembly, and painting of tanks mounted on four-wheeled trailers of the farm type used in transporting ammonia from bulk storage plants to the farm, commonly called farm trailers.
2. (2) Such tanks shall not exceed one thousand two hundred (1,200) water-gallon capacity.

(c)

1. (1) Farm trailer tanks shall be equipped with the necessary fittings as outlined herein.
2. (2) Fittings installed in the top portion of the shell shall be located in the center of the container and shall be adequately protected from physical damage by means of a rigid guard securely fastened to the container.
3. (3) The guard shall be so designed as to give a rolling effect to the container in the event the trailer overturns.
4. (4) The guard shall also be designed to give a skid effect in the event the trailer overturns and continues to move forward.
5. (5) Fittings installed in the rear head of the container shall be protected with a permanent fixture without hinges of a material the same tensile strength as the container itself, and a thickness of not less than three-eighths inch (3/8”).
6. (6) The safety relief valves shall have direct communication with the vapor space of the container and shall be protected from rain and snow with a loose-fitting covering.

(d)

1. (1) Dip tubes shall be provided for the safety valve, vapor valve, filler valve, vapor gauge, and fifteen percent (15%) outage gauge.
2. (2) They shall consist of heavy duty piping curved or bent without cutting and welding.
3. (3) Dip tubes for safety valves, vapor valves, and vapor gauge shall extend up into the vapor space of the container not less than three-fourths inch (3/4”) from top of the container.
4. (4) The dip tube for the outage gauge shall extend up to a point in the container which will indicate the presence of liquid when the container is not more than eighty-five percent (85%) full.
5. (5) Dip tubes for filler valves shall extend to within not less than three-fourths inch (3/4”) from the bottom of the container.
6. (6) All dip tubes shall be screwed directly into the coupling not less than five (5) full threads and seal welded.
7. (7) They shall also be firmly anchored at point of termination with a bracket and clamp.
8. (8) Provision shall be made for the expansion or contraction of the bracket or clamp in the event of any out-of-roundness of shell plate.

(e)

1. (1) All containers shall be equipped with suitable baffle plates which will eliminate the surging of the liquid in the container when the trailer is in motion and when making sudden stops.
2. (2) Baffle plates shall be attached in such a manner as to allow for any expansion or contraction of shell plates under internal pressure due to any out-of-roundness.

(l)

1. (1) Containers used for the storage or transportation of anhydrous ammonia shall not be used for any other purpose.
2. (2) The filling of containers of this type with liquefied petroleum gases is strictly forbidden.