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AMERICAN NATIONAL STANDARD K61.1-1981 tube, fixed tube, and slip tube devices, shall be with Department of D-ansportation Specifica. designed so that the maximum opening of the tions. All Basic Rules of Section 2 apply to this bleed valve is not larger than No: 54 drill size section unless otherwise noted unless provided with an excess now valve. (This requirement does not apply to farm vehicles used 3.1 Design Pressure and Construction for the application of ammonia as covered in Section 8.) of Containers 2.14.4 Gaging devices shall have a desi n 3.1.1 The minimum design pressure for non- pressure equal to or greater than the design refrigerated aboveground containers shall be pressure of the container on which they are 250 psig(1720 kPa). [See 2.2.1.1) installed. NOTE: U-68 and U-69 ASM E Code containers with a design pressure of 200 psig are acceptable if recertified to 250 psig 2.14.5 Fixed liquid level gages shall be so and equipped with pressure relief valves set at 250 psig as designed that the maximum volume of the permitted in 2.9.2. container filled by liquid shall not exceed 85 0 of its water capacity. The coupling into which the 3.2 Container Valves and Accessories,Filling fixed liquid level gage is threaded must be placed and Discharge Connections at the 85% level of the container. If located 3.2.1 Each filling connection shall be provided elsewhere, the dip tube of this gage must be with combination back-pressure check valve and installed in such a manner that it cannot be excess flow valve;one double or two single back- readily removed. pressure check valves;or a positive shut-off valve NOTE: This does not apply to refrigerated storage. in conjunction with either an internal back- 2.14.6 Gage glasses of thecolumnart pressure check valve or an internal excess flow type valve. be restricted to stationary storage installations. They shall be equipped with shut-off valves 3.2.2 All vapor and liquid connections,except having metallic handwheels, with excess-flow pressure relief valves and those specifically valves, and with extra heavy glass adequately exempt in Sections 2.6.4 and 2.6.5 shall be protected with a metal housing appplied by the equipped with approved excess flow valves;or in gage manufacturer. They shall be shielded lieu thereof,may be fitted with approved quick- against the direct rays of the sun. closing internal valves which, except during operating periods, shall remain closed. 2.15 Painting of Containers 3.2.3 Each storage container shall be provided 2.15.1 Aboveground uninsulated containers with a pressure gage graduated from 0 to 400 should have a reflective surface maintained in psig(0-275kPa). Gages shall be designated for good condition. White is recommended for use in ammonia service. painted surfaces,but other light reflecting colors 3.2.4 All containers shall be equipped with an are acceptable. approved vapor return valve. 2.16 Electrical Equipment and Wiring 3.2.5 All containers shall be equipped with a fixed maximum liquid level gage. 2.16.1 Electrical equipment and wiring for use in ammonia installations shall be general 3.3 Pressure Relief Devices purpose or weather resistant as appropriate. 3.3.1 Every container shall be provided with 2.16.2 Where concentrations of ammonia in one or more pressure relief valves of spring- air in excess of 16% by volume are likely to be loaded or equivalent type and shall comply with encountered, electrical equipment and wiring the following: shall be of a type specified by and be installed in (a) The discharge from pressure relief valves accordance with National Electrical Code,NFPA shall be directed away from the container upward 70(ANSI-CI), for Class I, Group D locations. and unobstructed to the open air..Vent pipes shall not be restrictive or smaller in size than the 3. SYSTEMS UTILIZING STATIONARY, pressure relief valve outlet connection. All pres- PIER-MOUNTED OR SKID-MOUNTED sure relief valve discharges shall have suitable ABOVEGROUND OR UNDERGROUND, rain caps that will allow free discharge of the NON-REFRIGERATED STORAGE vaporand prevent the entrance of water.Suitable This section applies to stationary,pier-mounted, provision shall be made for draining condensate skid-mounted, aboveground or underground,non- which may accumulate. refrigerated storage installations utilizing con- (b) If desired, vent pipes from two or more ' g 9 pressure relief devices located on the same unit, tainers other than those constructed in accordance or similar lines from two or more different units, 16