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*./ AMERICAN NATIONAL STANDARD K6m.1981 degrees Fahrenheit for which the container was same storage unit may be run into a common designed. discharge header.The discharge line and header 4.3.1.5 With the maximum allowable water shall be designed to accommodate the maximum level to which the container may be filled for the flow and a back pressure not exceeding 10%of the test purposes. design pressure of the storage container. This ,0 back pressure shall be included in the 120total 4.3.1.6 With the density of the product in maximum pressure given in 4.5.1. No other pounds per cubic foot for which the container was container or system shall exhaust into this designed. discharge line or header.The vent lines shall be installed to prevent accumulation of liquid in the 4.3.1.7 With the maximum level to which lines. the container maybe filled with liquid anhydrous ammonia. 4.5.5 Atmospheric storage shall be provided with vacuum breakers. Ammonia gas may be 4.4 Tank Valves, Fill Pipes used to provide a pad. and Discharge Pipes 4.4.1 Shut-off valves shall be: 4.6 Protection of Container Appurtenances (a) Provided for all connections except those 4-6.1 Refrigerated storage containers shall with a No. 54 drill size restriction, plugs, safety comply with the provisions of Paragraph 3.7. valves, thermometer wells, and (b) Located as close to the tank as practicable. 4.7 Reinstallation of Containers 4.4.2 When operating conditions make it 4.7.1 Containers of such size as to require field advisable, a check valve shall be installed on the fabrication shall,when moved and reinstalled,be fill connection and a remotely operated shut-off reconstructed and reinspected in complete ac- valve on other connections located below the cordance with the code under which they were maximum liquid level. constructed.The containers shall be subjected to a pressure retest, and if rerating is necessary, it 4.5 Pressure Relief Devices shall be done in accordance with the applicable 4.5.1 Pressure relief valves shall be set to code pressures. start-to-discharge at a pressure not in excess of 4.8 Damage from Vehicles the design pressure of the tank and shall have a total relieving capacity sufficient to prevent a 4.8.1 Precaution shall be taken to avoid any maximum pressure in a tank of more than 120% damage by trucks,tractors,or other vehicles. of the design pressure. 4.5.2 The total relieving capacity of pressure- 4.9 Refrigeration Load and Equipment relief devices shall be in accordance with appli- 4.9.1 The total refrigeration load shall be cable sections of CGA Pamphlet S-1.3, Pressure computed as the sum of the following: Relief Device Standards for Compressed Gas Storage Containers. 4.9.1.1 Load imposed by heat flow into the container caused the temperature differential 4.5.3 Shut-off valves of adequate flow capacity between the ambient temperature and the storage may be provided and used tofacilitateinspection temperature. and repair of pressure relief valves.When a shut- offvalveisprovideditshall be so arranged that it 4.9.1.2 Load imposed by heat flow into the can be locked or sealed open, and it shall not be tank caused by maximum sun radiation. closed except by an authorized person who shall 4.9.1.3 Maximum load imposed by filling remain stationed there while the valve remains the tank with ammonia warmer than the design closed,and who shall again lock or seal the valve storage temperature. open when leaving the station. 4.5.4 Pressure relief devices shall comply with 4.9.2 More than one storage tank may be the following: handled by the same refrigeration system. 4.5.4.1 If stacks are used they shall be suit- 4.9.3 Compressors (See also 2.12.7) ably designed to prevent obstruction by rain, 4.9.3.1 Aminimumoftwocompressorsshall snow, ice or condensate.The outlet size shall not be provided,eithe minimum m ofthich isof sufficient o size to re smaller than the nominal size of the pressure handle the loads listed in Paragraph 4.9.1.1 and relief valve outlet connection. 4.9.1.2. Where more than two compressors are 4.5.4.2 Discharge lines may be used if provided,minimum standby equipment equal to desired. Multiple pressure relief valves on the the largest normally operating equipment shall 19