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AMERICAN NATIONAL STANDARD K61.1.1981 for the Storage and Handling of Agricultural (a) With a marking identifying compliance .Ammonia,"M-1, in effect at the time of installa- with the rules of the Code under which the tion, are acceptable for continued use. container is constructed. 2.1.3 The appurtenances of each system shall (b) With a notation on the container and system be approved. underground installation.nameplate when the stem is designed for 2.2 Requirements for Construction and Test (c) With the name and address of the fabricator Including Skid Containers Other of the container or the trade name of the container of Containers ( and with the date of fabrication. than Refrigerated Storage Tanks)(See Exception (d) With the water capacity of the container in in Paragraph 4.1.3). pounds at 60 F or gallons, U.S. Standard. 2.2.1 Containers used with systems covered in (e) With the design pressure in pounds per Section 3, 6, 7 and 8 shall be constructed and square inch gage. tested in accordance with the Code except that (fl With the wall thickness of the shell and construction under Table UW 12 at a basic joint heads. efficiency of under 80% is not authorized. (g) With the outside surface area in square feet. 2.2.2 Containers built in accordance with the (h) With minimum temperature in Fahrenheit Code,do not have to comply with paragraphs UC for which the container is designed. 125 through UG 128 inclusive, and paragraphs (i) Marking specified on container shall be on UG 132 and 133. the container itself or on a nameplate perma- 2.2.3 Containers other than refrigerated nently affixed thereto. storage containers shall be constructed to comply 2.3.3 Each container or system covered in with one or more of the following additional Sections 3, 6.7 and 8 shall be fitted with a liquid requirements. level gage indicating the maximum level to Containers shall be stress relieved which the container may be filled with liquid 2.2.3.1 ( ' after fabrication a procedure stress accordance anhydrous ammonia at temperatures between 20 with the Code,or F(-6.7 C)and 100 F(37.8 C)except on containers provided with fixed maximum level indicators, 2.2.3.2 Cold formed heads,when used shall such as fixed length dip tubes,or containers that be stress relieved, or are filled by weight. Markings shall be in 2.2.3.3 Hot formed heads shall be used. increments of not more than 20 F (-6.7 C). 2.3.4 All container openings,except for safety 2.2.4 Welding for the repair or alteration of relief devices or level indicators,shall be marked, the shell shall be done In compliance with the stenciled, tagged or decaled to indicate whether National Board Inspection Code and with pro- the opening is in liquid or vapor service when the cedures detailed in ASME Code Section IX and container is filled to the maximum allowable the Code under which the container was fabri- filling density. cated.Other welding is permitted only on saddle Elates,lugs,or brackets attached to the container 2.4 Marking Refrigerated Containers y the container manufacturer. (See Section 4.3, Marking Refrigerated 2.2.5 All containers, except refrigerated Containers) storage tanks with a design pressure of 15 psig (103.42 kPa)and less,and containers constructed 2.5 Location of Containers in accordance with Specifications of the DOT, 2,5.1 Consideration shall be given to the shall be inspected by a person having a current effects of ammonia as well as to certificate of competency from the National ' physiological Board of Boiler and Pressure Vessel Inspectors. adjacent fire hazards in selecting the location for a storage container. Containers shall be located outside of buildings or in buildings or sections 2.3 Markings on Non-Refrigerated Con- tainers and Systems Other Than DOT thereof especially approved for this purpose. Containers 2.5.2 Containers shall be located at least 50 2.3.1 System nameplates,when required,shall feet(15.2 m) from a dug well or other sources of be permanently attached to the system so as to be Potable water supply; unless the container is a readily accessible for inspection and shall include part of a water treatment installation. C� markings as prescribed in 2.3.2. 2.5.3 The location of permanent storage con- 2.3.2 Each container or system covered in tainers shall be outside densely populated areas. Sections 3,6,7 and 8 shall be marked as specified 2.5.4 Container locations shall comply with in the following: the following tables: 10