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58.12 v'DUSTRIAL RELATIONS TITLE 8 (Register 7 No.32-4.7.76) (2) The loading and/or unloading line in which it is located is secured to the tank or vehicle framework as required by Section 504 (i). (3) The quick-closing valve is located on the tank side of the structure used to secure the line or lines to the tank or vehicle frame. (i) All liquid and vapor lines shall be adequately secured to the vehicle frame or tank. The device used to secure the lines shall be so designed that it will withstand the load imposed by the strongest hose and hose fitting to be used in the transfer operations without breaking, or 2,000 pounds, whichever is greater. 0) All piping and fittings on transport and bulk delivery tanks shall be adequately guarded. The use of anhydrous ammonia hose between the tank and the transfer hose connection shall be limited to not more than 3 sections of metallic hose not over 24 inches in length in each liquid and vapor line. Such lengths of hose shall be used only where necessary to provide flexibility and shall not have 1 section of hose connected to another section of hose. Each section shall be so installed that it will be protected against mechanical damage and be readily visible for inspection. The manufacturer's identification required in Section 510 (b) shall be retained on each section. (k) All transportation tanks shall be equipped for spray loading (fill- ing in the vapor space), with an approved vapor return valve of ade- quate capacity. History. 1. Amendment of subsections (g), (h) and (j) filed 12-8-72 as procedural and organizational; effective upon filing (Register 72, No. 50). 2. Amendment of subsections (a) and (f) and new subsection (k) filed 3-28- 75; effective thirtieth day thereafter (Register 75, No. 13). 3. Repealer and new subsection (f) filed 8-6-76;effective thirtieth day there- after hereafter (Register 76, No.32). 505. Installation of Mobile Storage Tanks. (a) Mobile storage tanks shall meet the requirements of Section 504 except that: (1) The design of saddles, bolsters, and/or other fastenings maybe based on the empty weight of the tank for other than vertical-load- ings.(2) In addition to the requirements of Section 504 (f), there shall be available a container of not less than 50 gallons of fresh water unless there is immediately available another safe, reliable, and acces- sible source of water. (b) When containing NH3 liquid, mobile storage tanks shall be locat- ed in accordance with Section 501 (c). (c) Mobile storage tanks shall be maintained substantially level and be securely blocked against accidental movement and shall be ade- quately supported independently of the wheels when containing NH3 liquid. (d) Only flexible connections shall be made to mobile storage tanks. No permanent piping to other installations is permitted. The loading and unloading connections shall be securely fastened to the vehicle frame or to the tank supports. ` (e) All liquid shall be removed from mobile storage tanks before being moved to a new location.