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58.18 :N,,,,U9MlAL RELATIONS ✓TITLE 8 (Register 77, No. IS—&7-T7) (f) Each transportation tank exceeding 1,200 gallon capacity shall have a pressure gage installed with the dial graduated to approximately double the operating pressure but in no case less than 1.2 times the pressure at which the pressure relieving device is set to function. Each farm vehicle tank over 250 gallons and each storage container shall be provided with a pressure gage graduated from 0 to 400 p.s.i. Gages shall be designated for use in ammonia service. History- 1. Amendment filed 12-8-72 as procedural and organizational;effective upon filing (Register 72, No. 50). 2. Amendment of subsections (a), (b) and (f) filed 3-28.75;effective thirtieth day thereafter (Register 75, No. 13). 509. Transfer of Liquids. (a) No anhydrous ammonia shall be vented to the atmosphere during the transfer operation unless the vent is led to a safe point of discharge. Anhydrous ammonia shall not be stored in or transferred into a con- tainer at a temperature lower than that shown on the nameplate. Containers shall be charged or used only upon authorization of the owner. (b) No gas other than anhydrous ammonia vapor shall be used to displace anhydrous ammonia during the transfer operation. (c) All filling connections and/or permanently installed transfer hoses shall be equipped with a shutoff valve at the discharge end and shall be kept effectively capped when not in use. These caps or plugs may be plastic or metallic, but must be so designed that they will be vented to the atmosphere while at least 3 full threads are engaged. (d) During the transfer of anhydrous ammonia, at least 1 attendant familiar with the installation shall remain in attendance at the controls necessary to stop the transfer operation. This attendant shall be consid- ered familiar with the installation only after he has been provided with a set of operating instructions for the unloading operation and has been instructed through a minimum of 3 full cycles of operation. During the transfer of anhydrous ammonia into or from a transportation tank, the brakes of the transporting vehicle shall be set and the wheels blocked. Provisions for unloading tank cars shall conform to the applicable recommendations contained in the DOT regulations. See 560(e) for Railroad Tank Car Loading and Unloading. (1) Caution signs shall be so placed on the track or car as to give necessary warning to persons approaching the car from open end or ends of siding and shall be left up until after the car is unloaded and disconnected from discharge connections. Signs shall be of metal or other suitable material, at least 12 by 15 inches in size and bear the words "STOP—Tank Car Connected" or "STOP—Men at Work" the word, "STOP", being in letters at least 4 inches high and the other words in letters at least 2 inches high. The letters shall be white on a blue background. (2) The track of a tank car siding shall be substantially level. (e) No anh drous ammonia shall be transferred with the point of delivery less than 10 feet from any residential building, street, public highway, or sidewalk unless the failure to transfer would create a haz- ard.