1、 ANSI/ASABE S620 MAR2017 Safety for Anhydrous Ammonia Application Equipment American Society of Agricultural and Biological Engineers ASABE is a professional and technical organization, of members worldwide, who are dedicated to advancement of engineering applicable to agricultural, food, and biolog
2、ical systems. ASABE Standards are consensus documents developed and adopted by the American Society of Agricultural and Biological Engineers to meet standardization needs within the scope of the Society; principally agricultural field equipment, farmstead equipment, structures, soil and water resour
3、ce management, turf and landscape equipment, forest engineering, food and process engineering, electric power applications, plant and animal environment, and waste management. NOTE: ASABE Standards, Engineering Practices, and Data are informational and advisory only. Their use by anyone engaged in i
4、ndustry or trade is entirely voluntary. The ASABE assumes no responsibility for results attributable to the application of ASABE Standards, Engineering Practices, and Data. Conformity does not ensure compliance with applicable ordinances, laws and regulations. Prospective users are responsible for p
5、rotecting themselves against liability for infringement of patents. ASABE Standards, Engineering Practices, and Data initially approved prior to the society name change in July of 2005 are designated as “ASAE”, regardless of the revision approval date. Newly developed Standards, Engineering Practice
6、s and Data approved after July of 2005 are designated as “ASABE”. Standards designated as “ANSI” are American National Standards as are all ISO adoptions published by ASABE. Adoption as an American National Standard requires verification by ANSI that the requirements for due process, consensus, and
7、other criteria for approval have been met by ASABE. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necess
8、arily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. CAUTION NOTICE: ASABE and ANSI standards may be revised or withdrawn at any time. Additionally, procedures of ASABE require that action be taken periodically
9、to reaffirm, revise, or withdraw each standard. Copyright American Society of Agricultural and Biological Engineers. All rights reserved. ASABE, 2950 Niles Road, St. Joseph, Ml 49085-9659, USA, phone 269-429-0300, fax 269-429-3852, hqasabe.org S T A N D A R D ANSI/ASABE S620 MAR2017 Copyright Americ
10、an Society of Agricultural and Biological Engineers 1 ANSI/ASABE S620 MAR2017 Approved March 2017 as an American National Standard Safety for Anhydrous Ammonia Application Equipment Developed by the X620 Standards development committee, approved by the ASABE Machinery Systems Technical Community; ap
11、proved by ASABE March 2017; approved by ANSI as an American National Standard March 2017. Keywords: anhydrous ammonia, safety, NH3, nitrogen, hitching, nurse tanks, toolbars, nurse tank wagons, break-away couplers, toolbars, applicators, distribution system, controls, fertilizer 1 Purpose and scope
12、1.1 The purpose of this standard is to establish the safety requirements for implements of husbandry used in the local transport and application of anhydrous ammonia for agricultural fertilizer. 1.2 This standard does not cover bulk storage and handling equipment, manufacture of, or over-the-road bu
13、lk transport equipment (other than implements of husbandry) for anhydrous ammonia. 1.3 This standard is applicable to new equipment manufactured and assembled after the publication of this standard. 2 Definitions Where possible, the terms and definitions used in this standard are aligned with ANSI/C
14、GA G-2.1. 2.1 anhydrous ammonia (NH3). The compound formed by the chemical combination of the elements nitrogen and hydrogen in molar proportion of one part nitrogen and three parts hydrogen. This relationship is shown by the chemical formula NH3. On a weight basis, the ratio is 14 parts nitrogen to
15、 three parts hydrogen, or approximately 82% nitrogen to 18% hydrogen. Ammonia may exist in either gaseous, liquid or solid state. It is not to be confused with aqua ammonia (ammonium hydroxide) which is a solution of ammonia in water (ANSI/CGA G-2.1). 2.2 anhydrous ammonia application unit (NH3 appl
16、icator). An implement of husbandry used to apply NH3 below soil surface. The nurse tank is typically attached to a separate implement (see 2.10). The shortened term “NH3 applicator” is used throughout this standard. 2.3 back pressure check valve. A device that allows liquid or gas to flow in only on
17、e direction. 2.4 break-away coupler. An automatic, self-closing device designed to disconnect NH3 hoses in case the nurse tank wagon(s) becomes detached. 2.5 excess flow valve. A device designed to automatically shut off the flow of NH3 at a designated flow rate. 2.6 liquid withdrawal valve. A valve
18、 designed for a nurse tanks liquid withdrawal port. 2.7 mechanically secure point. Connection point affixed to the nurse tank or nurse tank wagon and affixed to the towing implement for the attachment of the nurse tank hose(s). The mechanically secure point provides ANSI/ASABE S620 MAR2017 Copyright
19、 American Society of Agricultural and Biological Engineers 2 resistance allowing the break-away coupler to operate in the event of detachment of the nurse tank wagon from the towing implement. 2.8 nurse tank. A pressure vessel on nurse tank wagons used exclusively for local transport and field appli
20、cation of anhydrous ammonia. 2.9 nurse tank hose. The anhydrous ammonia hose(s) between the mechanically secure point on the nurse tank or nurse tank wagon and the break-away coupler on the towing implement. 2.10 nurse tank wagon. A carrier of nurse tanks defined per 2.8. Nurse tank wagons are norma
21、lly classified as bulk carrier equipment (ABC) per ANSI/ASAE S390. 2.11 rear hitch. A hitch point located at the rear of an implement of husbandry for attachment of a nurse tank wagon or other implement of husbandry. 2.12 swivel, pivot, or articulation point (of a break-away coupler). The location w
22、here the break-away coupler bends or swivels. Anything that allows the device to swivel so that it disconnects the nurse tank hose, even when at an angle, is considered a swivel/pivot/articulation point. It may be a bracket, but is not limited to brackets. 3 Normative references The following refere
23、nced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ANSI/ASABE AD11684, Tractors, machinery for agriculture and forestry,
24、 powered lawn and garden equipment Safety signs and hazard pictorials General principles ANSI/ASAE AD6489-3 Agricultural vehicles Mechanical connections between towed and towing vehicles Part 3: Tractor drawbar ANSI/ASAE EP363, Tractors, machinery for agriculture and forestry, powered lawn and garde
25、n equipment Operators manual Content and format ANSI/ASAE S279, Lighting and Marking of Agricultural Equipment on Highways ANSI/ASAE S318, Safety for Agricultural Field Equipment ANSI/ASAE S338, Field Equipment for Agriculture Safety Chain for Towed Equipment ANSI/ASAE S390.5, Definitions and Classi
26、fications of Agricultural Field Equipment ANSI/ASABE ISO 21244, Agricultural equipment Mechanical connections between towed and towing vehicles Implement hitch rings and attachment to tractor drawbars ASAE S360, Test Procedure and Performance Criteria for the Under-carriage Load Carrying Ability of
27、Farm Materials Transport Equipment ANSI/ASAE S365, Braking System Test Procedures and Braking Performance Criteria for Agricultural Field Equipment ANSI/ASABE 625 Drawbar Pin Dimensions and Requirements for Towed Equipment ANSI/ASABE S620 MAR2017 Copyright American Society of Agricultural and Biolog
28、ical Engineers 3 ANSI/CGA G-2.1, Safety Requirements for the Storage and Handling of Anhydrous Ammonia Note that ANSI/CGA G-2.1 is a revised version of the standard formerly and more commonly referred to as ANSI K61.1. ISO 4254-1, Agricultural machinery Safety Part 1: General requirements SAE J684,
29、Trailer Couplings, Hitches, and Safety Chains Automotive Type SAE J697, Safety Chain of Full Trailers Or Converter Dollies 4 Requirements Unless otherwise specified, ASAE S318, Safety for Agricultural Field Equipment shall be followed. ANSI/CGA G-2.1, Safety Requirements for the Storage and Handling
30、 of Anhydrous Ammonia provides the basis for regulatory and statutory law and shall be followed. 5 Nurse tank wagon safety and anhydrous ammonia flow control 5.1 Nurse tank valves and fittings: selection, installation and excess flow valve rating 5.1.1 Every tank withdrawal valve shall be protected
31、by an excess flow valve matched to the designed flow rate. Flow capacity of the excess flow valve shall not exceed 170 liters per minute (45 GPM) for 32 mm DN (1 inch NPS) nurse tank connections and 227 liters per minute (60 GPM) for 40 mm DN (1 inch NPS) nurse tank connections. 5.1.2 Piping, hoses,
32、 fittings and valves installed downstream of the excess flow valve and up to the tool-bar connection shall have a greater flow capacity than the excess flow valve. 5.1.3 When using an open yoke type excess flow withdrawal valve in a tank opening, the opening shall not be reduced with bushings to acc
33、ommodate the withdrawal valve. 5.1.3.1 A liquid withdrawal tank penetration utilizing a dip tube shall have the dip tube size and dimensions approved by the liquid withdrawal valve manufacturer for use with the withdrawal valves to be installed in the penetration. 5.2 Multiple nurse tank plumbing 5.
34、2.1 Multiple nurse tanks on a single nurse tank wagon This section applies to multiple nurse tanks on a single nurse tank wagon, with shared plumbing circuits. If the tanks are not plumbed together, they shall be treated as single tanks. 5.2.1.1 Hose, fittings and valve selection shall meet requirem
35、ents in Section 5.1, and ANSI/CGA G-2.1. 5.2.1.2 When plumbing multiple nurse tanks together on the same nurse tank wagon, all components for plumbing the tanks together shall be installed between a mechanically secure point on the wagon and the nurse tanks. 5.2.1.3 Multi-tank systems with more than
36、 one nurse tank hose connecting to the applicator shall have an excess flow valve installed at each outlet of the connection fitting and upstream of the mechanically secure point. The flow rating of each valve shall be equal to or less than the lowest rating of the excess flow valves at the individu
37、al tank withdrawal valves in the multi-tank system. (See the top layout in Figure 1). For systems with single hoses connecting to the applicator (see the bottom layout in Figure 1): ANSI/ASABE S620 MAR2017 Copyright American Society of Agricultural and Biological Engineers 4 Where the joining tee, f
38、ittings and down-stream hose are equal in size to the upstream components the excess flow valve shall be the sized as stated in paragraph one. Where the joining tee, fittings and down stream hose are sized for increased flow rates (by example 5.08 cm (2 inch) diameter components) the excess flow val
39、ve shall be sized accordingly and installed on the outlet of the connection fitting in a position upstream of the mechanically secure point and downstream of the fitting connecting the multiple tanks together (See the bottom layout in Figure 1). A shutoff valve with an upstream hydrostatic relief va
40、lve may be placed after the excess flow valve and the fitting. Figure 1 Examples of excess flow valve locations 5.2.1.4 To prevent the backfeeding of NH3, a back pressure check valve shall be installed on each inlet of each fitting (including, but not limited to, tees and crosses) for plumbing two N
41、H3 supply lines together (See Figure 1). 5.2.1.5 The nominal pipe size of any fitting used to connect plumbing from multiple nurse tanks shall be at least equal to that of the withdrawal valve outlet. 5.2.2 Withdrawal valves mounted in the front end of a tank shall be globe or “Y” pattern valves unl
42、ess they are protected by a separate mechanically secure point on the nurse tank wagon in which case they may be angle valves. Withdrawal valves mounted in the top or bottom of a tank shall be angle valves. 5.2.3 When multiple liquid withdrawal valves per tank are used, total excess flow valve capac
43、ity shall not exceed 170 liters per minute (45 GPM) on 32 mm DN (1 inch NPS) tank connections and 227 liters per minute (60 GPM) on 40 mm DN (1 inch NPS) connections. NOTE: For additional information reference Informative Annex 1, “Voluntary Guidelines for Plumbing Two Anhydrous Ammonia Tanks on One
44、 Running Gear” ANSI/ASABE S620 MAR2017 Copyright American Society of Agricultural and Biological Engineers 5 5.2.4 Nurse tanks not directly towed by the NH3 applicator. 5.2.4.1 A hose or pipe from the break-away coupler mounted on an intermediate towing implement shall be supported by that implement
45、. The hose or pipe shall be connected to a mechanically secure point at the front of the intermediate towing implement. A shutoff valve with an upstream hydrostatic relief valve may be installed upstream of the mechanically secure point. See Figure 1. 5.2.4.2 The rear hitch of an intermediate towing
46、 implement shall conform to the hitching and safety chain requirements in this standard. 5.3 Bottom mounted nurse tank valves Nurse tanks with bottom withdrawal valves shall conform to ANSI/CGA G-2.1. 5.4 Break-away and mechanically secure point requirements. 5.4.1 A break-away coupler shall be inst
47、alled and maintained in accordance with the coupler manufacturers instructions, at each rear mechanically secure point where the nurse tank or connecting hose crosses a hitching point. Mounting of the break-away coupler shall allow articulation as required by the coupler manufacturer. Instruction on
48、 break-away coupler inspection and maintenance shall be provided in applicable operators manuals in accordance with the coupler manufacturers instructions. 5.4.2 The swivel, pivot, or articulation point of the break-away coupler mounted on an implement towing a nurse tank wagon shall be at least 61
49、cm (24 inches) above the nurse tank wagon hitching point while in operation, but not more than 102 cm (40 inches). The mechanically secure point shall be no further than 23 cm (9 inches) forward of the hitching point, but not behind the hitching point. Single couplers shall be mounted no more than 15 cm (6 inches) left or right of the hitching point centerline. Dual couplers shall be mounted no more than 30 cm (12 inches) left or right of the hitching point centerline. Figure 2 shows the volumetric space
