Ammonia compression in an ammonia boil-off gas system

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Oregon Occupational Safety and Health Division AO 3-2019 Division 2 - 6.7.4 Knee bends with at least 10 complete standing and squatting motions in a 1-minute period. - 6.8 If at any time during the test the colorimetric indicating paper should change colors, the test should be stopped and section 6.10 and 6.12 initiated (See paragraph 4.2). - 6.9 After completion of the test exercise, the test area concentration should be measured again using the high range colorimetric detector tube. - 6.10 Exit the test area. - 6.11 The opening created by the suit zipper or other appropriate suit penetration should be used to determine the ammonia concentration in the suit with the low range length of stain detector tube or other ammonia monitor. The internal TECP suit air should be sampled far enough from the enclosed test area to prevent a false ammonia reading. - 6.12 After completion of the measurement of the suit interior ammonia concentration the test is concluded and the suit is doffed and the respirator removed. - 6.13 The ventilating fan for the test room should be turned on and allowed to run for enough time to remove the ammonia gas. The fan shall be vented to the outside of the building. - 6.14 Any detectable ammonia in the suit interior (5 ppm ammonia (NH3) or more for the length of stain detector tube) indicates that the suit has failed the test. When other ammonia detectors are used a lower level of detection is possible, and it should be specified as the pass/fail criteria. - 6.15 By following this test method, an intrusion coefficient of approximately 200 or more can be measured with the suit in a completely operational condition. If the intrusion coefficient is 200 or more, then the suit is suitable for emergency response and field use. - 7.0 - Retest procedures - 7.1 If the suit fails this test, check for leaks by following the pressure test in test A above. - 7.2 Retest the TECP suit as outlined in the test procedure 6.0. - 8.0 - Report - 8.1 Each gas-tight …

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Oregon Occupational Safety and Health Division Oregon Administrative Rules AO 3-2019 Division 2 - (ii) The employer shall insure that unloading operations are performed by reliable persons properly instructed and given the authority to monitor careful compliance with all applicable procedures. - (iii) Caution signs shall be so placed on the track or car as to give necessary warning to persons approaching the car from open end or ends of siding and shall be left up until after the car is unloaded and disconnected from discharge connections. Signs shall be of metal or other suitable material, at least 12 by 15 inches in size and bear the words 'STOP - Tank Car Connected' or 'STOP - Men at Work' the word, 'STOP,' being in letters at least 4 inches high and the other words in letters at least 2 inches high. - (iv) The track of a tank car siding shall be substantially level. - (v) Brakes shall be set and wheels blocked on all cars being unloaded. - (14) Liquid-level gaging device. - (i) Each container except those filled by weight shall be equipped with an approved liquid-level gaging device. A thermometer well shall be provided in all containers not utilizing a fixed liquid-level gaging device. - (ii) All gaging devices shall be arranged so that the maximum liquid level to which the container is filled is readily determined. - (iii) Gaging devices that require bleeding of the product to the atmosphere such as the rotary tube, fixed tube, and slip tube devices shall be designed so that the maximum opening of the bleed valve is not larger than No. 54 drill size unless provided with an excess flow valve. (This requirement does not apply to farm vehicles used for the application of ammonia as covered in paragraph (h) of this section.) - (iv) Gaging devices shall have a design pressure equal to or greater than the design pressure of the container on which they are installed. - (v) Fixed tube liquid-level gages shall be designed and installed to indicate that level at whi…

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\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ - (i) You must equip stationary liquefied hydrogen containers with safety relief devices sized in accordance with CGA Pamphlet S-1-1966, Part 3, Safety Relief Device Standards for Compressed Gas Storage Containers. - (A) Portable liquefied hydrogen containers complying with the U.S. Department of Transportation regulations must be equipped with safety relief devices as required in the U.S. Department of Transportation specifications and regulations. Safety relief devices must be sized in accordance with the requirements of CGA Pamphlet S-1-1966, Safety Relief Device Standards, Part 1, Compressed Gas Cylinders and Part 2, Cargo and Portable Tank Containers. - (ii) You must ensure that safety relief devices are arranged to discharge unobstructed to the outdoors and in such a manner as to prevent impingement of escaping liquid or gas upon the container, adjacent structures or personnel. See (2)(a)(vi) of this section for venting of safety relief devices in special locations. - (iii) You must design or locate safety relief devices or vent piping so that moisture cannot collect and freeze in a manner which would interfere with proper operation of the device. - (iv) You must provide safety relief devices in piping wherever liquefied hydrogen could be trapped between closures ## (e) Piping, tubing, and fittings . - (i) Piping, tubing, and fittings and gasket and thread sealants must be suitable for hydrogen service at the pressures and temperatures involved. You must give consideration to the thermal expansion and contraction of piping systems when exposed to temperature fluctuations of ambient to liquefied hydrogen temperatures. - (ii) Gaseous hydrogen piping and tubing (above--20 F) must conform to the  applicable sections of Pressure Piping Section 2--Indu…

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Oregon Occupational Safety and Health Division Oregon Administrative Rules AO 3-2019 Division 2 - (i) The content of tank motor vehicle containers shall be determined by weight, by a suitable liquid-level gaging device, or other approved methods. If the content of a container is to be determined by liquid-level measurement, the container shall have a thermometer well so that the internal liquid temperature can be easily determined. This volume when converted to weight shall not exceed the filling density specified by the DOT. - (ii) Any pump, except a constant speed centrifugal pump, shall be equipped with a suitable pressure actuated bypass valve permitting flow from discharge to suction when the discharge pressure rises above a predetermined point. Pump discharge shall also be equipped with a spring-loaded safety relief valve set at a pressure not more than 135 percent of the setting of the bypass valve or more than 400 p.s.i.g., whichever is larger. - (iii) Compressors shall be equipped with manually operated shutoff valves on both suction and discharge connections. Pressure gages of bourdon-tube type shall be installed on the suction and discharge of the compressor before the shutoff valves. The compressor shall not be operated if either pressure gage is removed or is inoperative. A spring-loaded, safety-relief valve capable of discharging to atmosphere the full flow of gas from the compressor at a pressure not exceeding 300 p.s.i.g. shall be connected between the compressor discharge and the discharge shutoff valve. - (iv) Valve functions shall be clearly and legibly identified by metal tags or nameplates permanently affixed to each valve. - (7) (Reserved) - (8) (Reserved) - (9) Chock blocks. At least two chock blocks shall be provided. These blocks shall be placed to prevent rolling of the vehicle whenever it is parked during loading and unloading operations. - (10) Portable tank containers (skid tanks). Where portable tank containers are used for farm sto…

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Division 2 AO 3-2019 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (16) Electrical equipment and wiring. - (i) Electrical equipment and wiring for use in ammonia installations shall be general purpose or weather resistant as appropriate. - (ii) Electrical systems shall be installed and maintained in accordance with Subpart S of this part. - (c) Systems utilizing stationary, nonrefrigerated storage containers. This paragraph applies to stationary, nonrefrigerated storage installations utilizing containers other than those covered in paragraph (e) of this section. Paragraph (b) of this section applies to this paragraph unless otherwise noted. - (1) Design pressure and construction of containers. The minimum design pressure for nonrefrigerated containers shall be 250 p.s.i.g. - (2) Container valves and accessories, filling and discharge connections. - (i) Each filling connection shall be provided with combination back-pressure check valve and excess-flow valve; one double or two single backpressure check valves; or a positive shutoff valve in conjunction with either an internal back-pressure check valve or an internal excess flow valve. - (ii) All liquid and vapor connections to containers except filling pipes, safety relief connections, and liquid-level gaging and pressure gage connections provided with orifices not larger than No. 54 drill size as required in paragraphs (b)(6)(iv) and (v) of this section shall be equipped with excessflow valves. - (iii) Each storage container shall be provided with a pressure gage graduated from 0 to 400 p.s.i. Gages shall be designated for use in ammonia service. - (iv) All containers shall be equipped with vapor return valves. - (3) Safety-relief devices. - (i) Every container shall be provided with one or more safety-relief valves of the spring-loaded or equivalent type in accordance with paragraph (b)(9) of this section.

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Division 2 AO 3-2019 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (ii) An emergency source of power of sufficient capacity to handle the loads listed in paragraphs (d)(8)(i)(A) and (B) of this section shall be provided unless facilities are available to safely dispose of vented vapors while the refrigeration system is not operating. - (11) Automatic control equipment. - (i) The refrigeration system shall be arranged with suitable controls to govern the compressor operation in accordance with the load as evidenced by the pressure in the container(s). - (ii) An emergency alarm system shall be installed to function in the event the pressure in the container(s) rises to the maximum allowable operating pressure. - (iii) An emergency alarm and shutoff shall be located in the condenser system to respond to excess discharge pressure caused by failure of the cooling medium. - (iv) All automatic controls shall be installed in a manner to preclude operation of alternate compressors unless the controls will function with the alternate compressors. - (12) Separators for compressors. - (i) An entrainment separator of suitable size and design pressure shall be installed in the compressor suction line of lubricated compression. The separator shall be equipped with a drain and gaging device. - (ii) (Reserved) - (13) Condensers. The condenser system may be cooled by air or water or both. The condenser shall be designed for at least 250 p.s.i.g. Provision shall be made for purging noncondensibles either manually or automatically. - (14) Receiver and liquid drain. A receiver shall be provided with a liquid-level control to discharge the liquid ammonia to storage. The receiver shall be designed for at least 250 p.s.i.g. and be equipped with the necessary connections, safety valves, and gaging device. - (15) Insulation. Refrigerated containers and pipelines which are insulated shall be covered with a material of suitable quality and thickness for the t…

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Division 2 AO 3-2019 Oregon Administrative Rules Oregon Occupational Safety and Health Division - (iv) Safety-relief valves shall be so arranged that the possibility of tampering will be minimized. If the pressure setting adjustment is external, the relief valves shall be provided with means for sealing the adjustment. - (v) Shutoff valves shall not be installed between the safety-relief valves and the container; except, that a shutoff valve may be used where the arrangement of this valve is such as always to afford full required capacity flow through the relief valves. - (vi) Safety-relief valves shall have direct communication with the vapor space of the container. - (vii) Each container safety-relief valve used with systems covered by paragraphs (c), (f), (g), and (h) of this section shall be plainly and permanently marked with the symbol 'NH3' or 'AA;' with the pressure in pounds-per-square-inch gage at which the valve is set to start-todischarge; with the actual rate of discharge of the valve at its full open position in cubic feet per minute of air at 60 degrees F. and atmospheric pressure; and with the manufacturer's name and catalog number. - Example: 'NH3 250 4050 Air' indicates that the valve is suitable for use on an anhydrous ammonia container, is set to start-to-discharge at a pressure of 250 p.s.i.g., and that its rate of discharge at full open position (Subdivisions (ii) and (iii) of this subparagraph) is 4,050 cubic feet per minute of air. - (viii) The flow capacity of the relief valve shall not be restricted by any connection to it on either the upstream or downstream side. - (ix) A hydrostatic relief valve shall be installed between each pair of valves in the liquid ammonia piping or hose where liquid may be trapped so as to relieve into the atmosphere at a safe location. ## (10) General. - (i) (Reserved) - (ii) Stationary storage installations must have at least two suitable gas masks in readily-accessible locations. Full-face masks with amm…