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AMERICAN NATIONAL STANDARD K61.1-1981 its weightexceptthe towingdevice restsupon the facepiece•in relation to the immediate environ- towing vehicle. ment is positive during inhalation and exhalation. 1.3.17 "Tank Motor Vehicle"means any motor 1.3.26 "Immediately Dangerous to Life or vehicle designed or used for the transportation of Health, (IDLH)" refers to any atmosphere that anhydrous ammonia in any tank designed to be poses an immediate hazard to life or produces permanently attached to any motor vehicle or irreversible debilitating effects on health. any container not permanently attached to any motor vehicle which by reason of its size, con- 1.4 Use of Water in Emergencies struction or attachment to any motor vehicle must be loaded and/or unloaded without being 1.4.1 The concentration of ammonia vapor in removed from the motor vehicle. air can effectively be reduced by the use of adequate volumes of water applied through spray 1.3.18 "Semi-trailer" refers to every vehicle or fog nozzles. designed for carrying persons or property and for being drawn by a motor vehicle and so 1.4.2 Water should be used on liquid ammonia constructed that some part of its weight and that spills only if sufficient water is available.For the of its load rests upon or is carried by anotherpurpose of this section, sufficient water may be vehicle. :- taken to be 100 parts of water to one part of 1.3.19 "Pressure Relief Valve" means a pres- ammonia. sure relief device characteHzed byrapidopening 1.4.3 If an ammonia container is exposed to or pop action,or by opening in proportion to the fire and cannot be removed,water should be used increase in pressure over the-opening pressure, to cool it. depending on application. 1.4.4 Under some circumstances ammonia in 1.3 20 "Hydrostatic Relief Valve"refers to an a container is colder than the available water automatic pressure activated valve for liquid supply.Under these circumstances water should service designed to prevent excessive pressure not be sprayed on the container walls since it 'lie to thermal expansion when a pipe or con- would heat the ammonia and aggravate any gas ♦ .iner becomes liquid filled, leak. 1.3.21 "Permanent Storage Installation" 1.4.5 If it is found necessary to dispose of refers to a system exceeding 1000 gallons (3.79 ammonia, as from a leaking container, liquid m3) water capacity which is used for storage or ammonia should be discharged into a vessel supply of ammonia and which is mounted on a containing water sufficient to absorb it. Suffi- slab, pier or skid. cient water may be taken to be ten parts of water 1.3.22 "Emergency refers to any occurrence per part ammonia. The ammonia should be sequipment failure injected to the water as near the bottom of the such as, but not limited to, a q P vessel as practical. which has the potential to, or does, result in the release of more than 300 pounds (136.1 kg) of 2. BASIC RULES anhydrous ammonia. 1.3.23 "Repair"refers to the work necessary to standard unle sotis Section heru-isen ted.lies to all sections of this restore a container or system to a safe and satisfactory operating condition provided that in 2.1 Equipment and Systems all cases the container or system design shall continue to comply with the requirements of this 2.1.1 The provisions of 2.2.1 shall not be con- standard,or the standard in effect at the time of strued as prohibiting the continued use or installation,that special service requirements do reinstallation of containers constructed and not restrict such work and the basic design maintained in accordance with the 1949, 1950, concept of the system is not altered. 1952,1956,1959,1965,1968,1971,1974,1977 and 1980 Editions of the Code or any revisions thereof 1.3.24 "Alteration" means a change in any in effect at the time of fabrication. item described in the original Manufacturer's Data Report which affects the pressure contain- 2,1.2 Systems and components which were ing capability of the container. Rerating a fabricated, installed and maintained in accord- container by increasing maximum allowable ante with the American National Standard, working pressure or temperature shall be con- Safety Requirements for the Storage and cidered an alteration. HandlingofAnhydrous Ammonia,"K61.1,orthe Compressed Gas Association"Standards for the `• 1.3.25 "Positive Pressure Self-Contained Storage and Handling of Anhydrous Ammonia Breathing Apparatus"is asupplied air respirator and Ammonia Solutions—Part 1 Anhydrous in which the pressure inside the tight-fitting Ammonia"or The Fertilizer Institute"Standard 9