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T= 8 DIVISION OF INDUSTRIAL SAF�iY 58.17 %�NFIRED PRESSURE VESSEL SAFl,,,A)RDERS (Roglstor 77, No. 15-4-7-77) (g) Every liquid pipeline or hose that can be isolated by 2 or more stop valves shall have a safety relief valve installed in the pipeline or hose to prevent excessive hydrostatic pressure. The safety relief valve required by this subsection shall start to discharge at not less than 300 psi, nor more than 400 psi, and it must relieve to the atmosphere at a safe point of discharge. (h) All valves, regulators, gaging, and other tank accessory equip- ment shall be protected against physical damage. (i) All tank connections requiring manually operated shutoff valves shall be labeled or tagged to indicate whether they communicate with the liquid or vapor space. 0) The liquid fill line used to transfer anhydrous ammonia from transportation tanks exceeding 3,500 gallons capacity to storage tanks exceeding 2,000 gallons capacity shall be equipped with a backflow check valve to prevent discharge of anhydrous ammonia from the re- ceiving tank in case of hose rupture. This is not intended to prevent transferring anhydrous ammonia from containers, other than transpor- tation tanks exceeding 3,500 gallons capacity,into storage tanks through the load-out line. (k) All tanks shall be equipped with vapor return valves. History: 1. Amendment filed 12-8-72 as procedural and organizational;effective upon filing (Register 72, No. 50). 2. Repealer of subsection (e) and new subsection (e) filed 8-30.74; effective thirtieth day thereafter (Register 74, No. 35). 3. Amendment of subsections (a), (c), (d), (e), (g) and new subsection (k) { filed 3-28-75; effective thirtieth day thereafter (Register 75, No. 13). 4. Repealer and new subsections (e) and (f) filed 8-676; effective thirtieth day thereafter (Register 76, No.32). 508. Gaging Devices. (a) Apermanent dip pipe shall be in- stalled in all tanks designed to be filled by volume, and shall be of such length that it will indicate when the tank is 86'/Z percent full. The fixed dip pipe required in this order shall be permanently installed in the tank. Each applicator container shall have a fixed liquid-level gage. (b) Each tank filled by volume shall be equipped with a liquid level gaging device, such as a rotary gage, a slip .tube, an automatic gage, a magnetic gage, or a series of fixed dip pipes, to show the liquid level in the tank at any time. This gaging device shall be in addition to the fixed dip pipe required in Section 508 (a). A thermometer well shall be provided in all storage tanks over 1,200 gaLons capacity not equipped with a fixed dip pipe, and in all transpor- tation tanks (c) Liquid level gaging devices that require bleeding of the product to the atmosphere, such as rotary gages, dip pipes, or slip tubes, shall be so designed that the maximum opening of the bleeder valve is not larger than No. 54 drill size. (d) Liquid level gaging devices shall be designed for a working pres- sure of not less than 300 psi ANS rating. (e) Tubular-type gage glasses shall not be used.