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r AMERICAN NATIONAL STANDARD K61.1-1981 f be installed. Compressors required for 4.9.1.3 by air or water or bath. The condenser shall be may be used as standby equipment for com- designed for at least 250 psig (1720 kPa). Pro- pressors required in 4.9.1.1 and 4.9.1.2: vision shall be made for purging non-condensibles 4.9.3.2 Compressors shall be sized to operate either manually or automatically. with.a suction pressure at least 10% below the 4.9.8 Receiver and Liquid Drain minimum setting of the pressure relief valve(s) 4.9.8.1 A receiver shall be provided which is on the storage tank and shall withstand a suction equipped with cc automatic float valve to dis- pressure least equal 120,0Nof the design charge the liquid ammonia to storage or with a pressure off the tank. Discharge pressure will be governed by condensing conditions. high pressure liquid drain trap of suitable capacity. The receiver shall be designed for at 4.9.4 Compressor Drives least 250 psig(1720 kPa)operating pressure and be equipped with the necessary connections, 4.9.4.1 Each compressor shall have its pressure relief valves and gaging device. individual driving unit. 4.9.9 Insulation 4.9.4.2 Any standard drive consistent with 4.9.9.1 Refrigerated containers and pipe good design maybe used. lines which are insulated shall be covered with a 4.9.4.3 An emergency source of power of material of suitable quality and thickness for the sufficient capacity to handle the loads listed in temperatures encountered. Insulation shall be paragraphs 4.9.1.1 and 4.9.1.2 shall be provided, suitably supported and protected against the unless facilities are provided to safely dispose of weather. Weatherproofing shall be of a type vented vapors while the refrigeration system is which will not support flame propagation. not operating. 4.9.5 Automatic Control Equipment 4.10 Safety Equipment 4.9.5.1 The refrigeration system shall be 4.10.1 All refrigerated storage plants shall arranged with suitable controls to govern the have on hand the minimum safety equipment C ♦ compressor operation in accordance with the required under paragraph 2.10.3. load as evidenced by the pressure in the container(s). 5. SYSTEMS UTILIZING PORTABLE DOT CONTAINERS AND CYLINDERS 4.9.5.2 An emergency alarm system shall be installed to function in the event the pressure in This section applies specifically to systems the container(s) rises to the maximum or falls to Utilizing cylinders, portable tanks (DOT-51), or the minimum allowable operating pressure. "ton containers" (DOT-106A, DOT-110A), con- structed in accordance with Department of Trans- 4.9.5.3 An emergency- alarm and shut-off portation Specifications. ALl Basic Rules of shall be located in the condenser system to Section 2 apply to this section, unless otherwise respond to excess discharge pressure caused by noted. failure of the cooling medium. 4.9.5.4 All automatic controls shall be 5.1 Containers & Cylinders installed in a manner to preclude operation of 5.1.1 Containers and cylinders shall comply alternate compressors unless the controls will with current DOT specifications and shall be function with the alternate compressors. maintained, filled, packaged, marked, labeled, 4.9.6 Separators and shipped to comply with current DOT regu- lations and the American National Standard, 4.9.6.1 Anentrainmentse p Method of Marking Portable Compressed Gas size and design pressure shall be installed in the Containers to Identify the Material Contained, compressor suction line. The separator shall be Z48.1* equipped with a drain and gaging device. ed 4.9.6.2 An oil separator 5.1.2 Containers ignind table ders shall be such P in an area free from ignitable debris and in such be installed in the compressor discharge line. It manner as to prevent external corrosion.Storage shall be designed for at least 250 psig(1720 kPa) may be indoors or outdoors. and shall be equipped with a gaging device and ( drain valve. 5.1.3 Containers and cylinders shall not be 4.9.7 Condensers buried below ground. 4.9.7.1 The condenser system maybe cooled 'See Appendix C for availability. 20