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- AMERICAN NATIONAL STANDARD K61.1-1981 5.1.4 Containers and cylinders shall be set with the requirements of the Department of 7' ans- upon firm foundations or otherwise firmly portation and those of any other regulatory body secured. The possible effect of settling on the which may apply. outlet piping shall be guarded against by a flexible connection or special fitting. 6.1 Design Pressure of Containers 5.1.5 Containers and cylinders shall be pro- 6.1.1 Containers used in intrastate commerce tected from heat sources such as radiant flame shall be constructed in accordance with Para- and steam pipes. Do not apply heat directly to graph 2.2 with a minimum design pressure of 250 containers or cylinders to raise the pressure. psig(1720 kPa)or as otherwise required by local 5.1.6 Containers and cylinders shall be stored regulations. Containers used in interstate com- in such manner as to protect them from moving merce shall meet DOT regulations. vehicles or external damage. 6.1.2 The shell or head thickness of any con- 5.1.7 Any container or cylinder which is tainer shall not be less than /i6 inch(4.8 mm). designed to have a valve protection cap or device 6.1.3 All container openings, except pressure shall have the cap or device securely in place relief valves, liquid level gaging devices and when the container or cylinder is not in service. pressure gages, shall be labeled to designate whether they communicate with liquid or vapor 5.2 Container and Cylinder Valves space. Labels may be on valves. and Regulating Equipment 6.1.4 Baffles are not required for cargo tanks. 5.2.1 Container and cylinder valves and pres- sure regulating equipment shall be protected 6.2 Mounting Containers on Truck against tampering when installed for use. 6.2.1 The means of attachment of any con- 5.2.2 Container and cylinder valves shall be tainer to the cradle,frame or chassis of a vehicle protected while in transit, in storage, and while shall be designed on a basis of two"g"loading in ♦ being moved into final utilizations, as follows: either direction, using a safety factor of not less (a) By setting them into a recess of the con- than 4, based on the ultimate strength of the tainer, or material used.For purposes of this requirement, (b) By ventilated cap or collar,fastened to the two "g" of load support is equivalent to three container, capable of withstanding a blow from times the static weight of the articles supported; any direction equivalent to that of a 30-1b. (13.6 two"g"of loading and bending,acceleration,and kg)weightdroppedfourfeet(1.2in).Construction torsion is equivalent to twice the static weight must be such that a blow will not be transmitted support applied horizontally at the road surface. to the valves or other connections. 6.2.2 "Hold-down" devices, when used, shall 5.2.3 When containers or cylinders are not anchor the container to the cradle, frame or connected for service, the outlet valves shall be chassis in asuitable and safe manner thatwill not kept tightly closed andprotected even though introduce undue concentration of stresses.These containers are considered empty. devices shall incorporate positive means for drawing the container down tight, and suitable 5.3 Pressure Relief Devices stops or anchors shall be provided to prevent relative movement between container and fram- 5.3.1 Containers shall be provided with pres- ing due to stopping, starting or changes in sure relief devices as required by DOT reg-u- direction. lations. 6.2.3 Vehicles designed and constructed so 6. SYSTEMS MOUNTED ON TRUCKS, that the cargo tanks constitute in whole or in part SEMI-TRAILERS,AND TRAILERS FOR the stress member used in lieu of the frame shall TRANSPORTATION OF AMMONIA be supported by external cradles suspending at least 1200 of the shell circumference.The design This section applies specifically to systems calculation shall include beam stress, shear mounted on trucks, semi-trailers and trailers stress, torsion stress, bending moment and (other than those covered under sections 7 and 8) acceleration stress, in addition to those covered usedforthe transportation ofammonia.AllBasic by the code under which the cargo tank was Rules of Section 2 apply to this section unless designed. otherwise noted. Systems for trucks and trailers 6.2.4 If a liquid withdrawal line is installed in for transportation of anhydrous ammonia, ' q addition to complying with the requirements of the bottom of a container,the connections thereto, these standards,shall also comply whererequired, including hose,shall not be lower than the lowest horizontal edge of the trailer axle. 21