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58.10 ,. DUSMAL RELATIONS TT1"1.F E (negiztnr T7, Flo. 144-2--,,) ,) (c) Fittings on all portable tanks shall be installed in recessed wells or otherwise protected to prevent damage to the fittings during trans- portation and use. (d) When portable tanks are transported from 1 location to another, they shall be securely fastened to the transporting vehicle. (e) When containers are mounted on four-wheel trailers, care shall betaken to insure that the weight is distributed evenly over both axles. (f) When the cradle and the tank are not welded together suitable material shall be used between them to eliminate metal-to-metal Fric- tion. History 1. Amendment filed 125-72 as procedural and organizational;effective upon filing (Register 70, No. 50). 8 New subsections (e) and (f) filed 3-2&75;effective thirtieth day thereafter (Register 75, No. 13). 504. Installation of Tanks on Transportation and Bull: Delivery Vehicles. (a) Transportation tanks mounted on truck: or trailer frames shall be placed on saddles or bolsters with the center of gravit� as low as possible. Such saddles, bolsters, and/or other fastenings shawl be designed to withstand a loading in any direction equal to the loaded weight of the tank when filled to the maximum permissible level with a factor of safety of at least 8. Transportation tanks of the so-called "frameless-ty shall not be used in anhydrous ammonia service until the design of the tank and tank supports has been submitted to the Division and found acceptable. The installation must also comply vrith DOT requirements. All transportation trailers shall be firmly and securely attached to the vehicle drawing them by means of suitable drawbars supplemented by a safety chain (or chains) or safety cables. Every transportation trailer or semitrailer shall have a reliable system of brakes, and adequate provision shall be made to operate the brakes from the driver's seat. Every transoortaticn trailer shall be equipped with self-energizing brakes. Transportation trailers shall be so designed that the towed vehicle will follow substantially in the path of the towing vehicle and will not whip or swerve dangerously from side to side. Where a fifth wheel is employed, it shall be ruggedly designed, se- curely fastened to both units, and equipped with a positive locldng mechanism which will prevent separation of the two units except by manual release. (b) Every transportation tank shall be protected by a suitable steel bumper attached to the vehicle chassis or ea_uivalent. (c) All fittings on transportation tanks not protected by the vehicle frame shall be located in recessed wells or otherwise suitably guarded. Any such guards shall be designed to minimize the possibilityof ruptur- ing the tank head or shall in case of vehicular accident. The recessed well, if used, shall be of sufficient size and depth that the top of all fittings will be located below the tank: shell or head line. The recessed well for safety relief valves shall be located at the top center of the tans: and shall be equipped with an unlocked hinged cove: or eouivalent.