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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1998 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 STANDARD Submitted for recognition as an American National Sta
4、ndard J2296 REV. NOV1998 Issued1996-09 Revised1998-11 Superseding J2296 SEP96 Retest of Refrigerant Container 1.Scope To provide a procedure to inspect a refrigerant cylinder used in equipment servicing mobile air- conditioning (A/C) systems. This includes the pressure cylinder used for refrigerant
5、recovery/recycling and charging equipment. 2.References 2.1Applicable Publications The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1CGA SPECIFICATIONS Available from Compres
6、sed Gas Association, Crystal Square #2, Jefferson Davis Highway, Arlington, VA 22202-4102. CGA S-1.1 Pressure Relief Device Standards Cylinders for Compressed Gases CGA C-6 Standards for Visual Inspection of Steel Compressed Gas Cylinders CGA C-6.1 Standards for Visual Inspection of High Pressure Al
7、uminum Compressed Gas Cylinders 2.1.2DOT SPECIFICATIONS Available from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402. DOT 39 DOT approved cylinder specifications (except those operating under exemptions) are found in 49 Code of Federal Regulations (CFR) secti
8、ons 178.1 through 178.68. 2.1.3UNDERWRITERS LABORATORIES Available from Underwriters Laboratories, 333 Pfingsten Road, Northbrook, IL 60062-2096. UL 1769 Cylinder Valves UL 1963 Standard for Refrigerant Recovery/Recycling Equipment, First Edition 1993, Copyright 1989 SAE J2296 Revised NOV1998 -2- 2.
9、2Related Publications The following publications are provided for information purposes only and are not a required part of this document. 2.2.1SAE PUBLICATIONS Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J513, 1976 Refrigeration Tube Fittings SAE J1990, 1989 Extraction
10、 and Recycle Equipment for Mobile Automotive Air-Conditioning Systems SAE J2197, 1991 HFC-134a (R-134a )Service Hose Fittings SAE J2209, 1991 Standard for Purity for Recycled HFC-134a (R-134a) for use in Mobile Air-Conditioning Systems SAE J2210 HFC-134a (R-134a) Recycling Equipment for Mobile Air-C
11、onditioning Systems 2.2.2ARI PUBLICATION Available from ARI, 4301 North Fairfax Drive, Suite 425, Arlington, VA. ARI Guideline K 1990 Cylinders for Recovered Fluorocarbon Refrigerants 2.2.3DOT PUBLICATION Available from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC
12、 20402. Part III Environmental Protection Agency, 40CFR Part 82 Protection of Stratospheric Ozone: Labeling Supplemental Proposal Final Rule 3.Storage Containers (Cylinder/Tank) 3.1Federal Requirements The container stores the refrigerant and protects it from outside contamination. Most refrigerants
13、 are under pressure at ambient temperatures. Refrigerants should never be charged and stored in unapproved containers such as DOT Specification 39 disposable cylinders. 3.1.1DOT STANDS FOR THE U.S. DEPARTMENT OF TRANSPORTATION Federal law forbids transporting DOT 39 cylinders if refilled and penalti
14、es up to a $25 000 fine and 5 years imprisonment may be expected (Title 49 U.S.C. (United States Code) Sec. 1809). 3.1.2Proper storage containers are DOT approved refillable containers which are stamped with the information in Figure 1: FIGURE 1 INFORMATION FOR CONTAINERS 3.1.2.1The sample informati
15、on is for a tank commonly called a “50-lb tank.” Other size tanks shall have the appropriate W.C. and T.W. markings. SAE J2296 Revised NOV1998 -3- 3.1.3The first line is the DOT code for a container rated at 400 psig (2760 kPa) or 302 psig (2084 kPa) or 350 psig (2415 kPa) working pressure. 3.1.3.1T
16、he second line is the container manufacturer serial number. 3.1.3.2The third line is the container manufacturer identification number. 3.1.3.3The fourth line W.C. is the water capacity in pounds when completely filled and T.W. is the cylinder tare weight in pounds. Since common refrigerants are heav
17、ier than water, this tank can safely be filled with 23 kg for CFC-12 (R-12) or 21 kg of HFC-134a (R-134a). 3.1.3.4The fifth line is the manufacturer s date code, which is important for the retested date. 3.2The containers and valves should meet UL 1963 which requires that: 3.2.1The storage container
18、 shall comply with DOT Specifications, 49 CFR, and have a service pressure rating not less than the recovery equipments pressure limiting device. 3.2.2The cylinder valve shall comply with the Standard for Cylinder valves, UL 1769. The pressure relief device shall comply with the Pressure Relief Devi
19、ce Standard Part 1 Pressure Relief Device Standards Cylinders for Compressed Gases” , Compressed Gas Association Pamphlet S-1.1. 3.2.3The tank assembly shall be marked to indicate the first retest date, which shall be 5 years from date of manufacture. Also the marking shall indicate that retest must
20、 be performed every subsequent 5 years. The marking shall be in letters at least 6 mm high. 3.3ARI Guideline K describes a color coding scheme for refrigerant cylinders. The color for recovered and recycled refrigerants, and refrigerant on its way back to a reclaim facility, is gray with a yellow to
21、p. Some recycling equipment manufacturers have provided light blue cylinders with yellow tops for automotive HFC-134a (R-134a) applications. 3.4Most storage containers are equipped with SAE 6.4 mm refrigeration flare fittings. For automotive HFC-134a (R-134a) applications, both new refrigerant cylin
22、ders (DOT 39) and refillable storage containers are fitted with special SAE 12.7 mm threads. 4.Container Labeling EPA regulations require labeling refrigerant tanks containing Class I (CFC) and Class II (HCFC) refrigerants. Each container shall bear the following warning statement: WARNING Contains
23、(Insert refrigerant), a substance which harms public health and environment by destroying ozone in the upper atmosphere. 5.Filling Containers Care must be exercised when filling storage containers because liquid refrigerants expand when heated. Referring to Figure 2, the tank on the left is filled t
24、o an 80% level at 21 C. The tank on the right shows that same amount of refrigerant warmed to 70 C. 5.1When a container is overfilled and subsequently exposed to higher temperatures, hydraulic expansion can cause the relief valve to open and vent refrigerant, and even can lead to a ruptured containe
25、r. SAE and UL standards require a container overfill protection based upon 80% liquid fill at 24 C. 5.2A full container condition can be determined by monitoring weight while filling. A predetermined load deflects the load cell to trip a limit switch. An electronic scale used for charging will also
26、detect a tank overfill condition. (See Figure 3.) SAE J2296 Revised NOV1998 -4- FIGURE 2 EXPANSION OF LIQUID REFRIGERANT WHEN HEATED FIGURE 3 MECHANICAL/ELECTRICAL LOAD CELL TANK OVERFILL PROTECTION 5.2.1For recovery units handling more than one refrigerant, allowable weight limits must be based on
27、the refrigerant with the lowest density to prevent overfilling the container. 5.3Float switches, or other liquid level sensors, can be used to detect full containers. They correctly gauged the fill level no matter the refrigerant type or oil content in the container. SAE J2296 Revised NOV1998 -5- 6.
28、Retesting Cylinders DOT regulations require that cylinders be retested every 5 years. 6.1The appropriate categories are DOT-3A, DOT-3AA, DOT-3A480X, DOT-4B, DOT-4BA, DOT-4BW, and DOT- 4E containing fluorinated hydrocarbons and mixtures thereof which are commercially free from corroding components. 6
29、.2External Visual Examination with Hydrostatic Test 6.2.1Retest at 5-year intervals. 6.2.2An authorized retester must perform a visual examination using CGA pamphlets C-6 and C-6.1. 6.2.2.1If the cylinder has a float switch, remove it and insert a plug prior to the hydrostatic test. Examine the floa
30、t assembly for corrosion and visual damage. 6.2.3Conduct a hydrostatic test by filling the cylinder with distilled water and pressurizing it at 2 times the normal service pressure. 6.2.4Measure expansion during the hydrostatic test. 6.2.5Condemn the cylinder when the tank leaks, has external corrosi
31、on, denting, bulging, or evidence of rough usage, or when the permanent expansion exceeds 10% of the total expansion after the hydrostatic test. 6.2.5.1If the cylinder is returned to service, replace the corroded or damaged float assembly or reinstall the original assembly. 6.2.5.2Assure that the fl
32、oat assembly is checked for calibration as identified in 6.2.8. 6.2.6Owners must keep records showing the result of reinspection and retesting until the cylinder is again reinspected or retested. 6.2.7Mark each cylinder passing retest with the cylinder testers identification number set in a square p
33、attern, between the month and year of the retested date in characters not less than 3 mm high with the first character occupying the upper left corner of the square pattern. For example, a cylinder retested in May 1984 by approved retester, A123 would be stamped as shown in Figure 4: FIGURE 4 EXAMPL
34、E OF A CYLINDER TESTED IN MAY 1984 6.2.8RETEST OF FLOAT SWITCH ASSEMBLY 6.2.8.1The cylinder is to be placed on a calibrated scale and the weight recorded. Connect an ohmmeter to the wire leads (or terminals) attached to the top float switch. Mount the cylinder upright. Gradually fill the cylinder wi
35、th distilled water until the ohmmeter indicates that the float switch is activated. Immediately stop filling the cylinder. Record the final weight of the cylinder filled with water. Subtract the initial cylinder weight from the final recorded weight of the cylinder to obtain the amount of water kg (
36、lb) required to activate the float switch. The weight of the water required to activate the float switch shall not exceed the W.C. marking on the cylinder multiplied by 0.8 (example 47.6 x 0.8 = 38.08). SAE J2296 Revised NOV1998 -6- 6.3Removal of Moisture 6.3.1After completing the pressure test in 6
37、.2.3, the container must be gravity drained for 30 min. 6.3.2Pressurize the container with dry air or nitrogen. 6.3.3After 30 min vent the cylinder. 6.3.4Using an operating vacuum source and the cylinder stabilized in a ambient temperature of 65 C 5 C, evacuate and maintain the cylinder to at least
38、10 mm of mercury absolute pressure for 1 h. 7.Notes 7.1Marginal Indicia The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title ind
39、icates a complete revision of the report. PREPARED BY THE SAE INTERIOR CLIMATE CONTROL STANDARDS COMMITTEE SAE J2296 Revised NOV1998 Rationale Not applicable. Relationship of SAE Standard to ISO Standard Not applicable. Application To provide a procedure to inspect a refrigerant cylinder used in equ
40、ipment servicing mobile air- conditioning systems. This includes the pressure cylinder used for refrigerant recovery/recycling and charging equipment. Reference Section SAE J513 1976 Refrigeration Tube Fittings SAE J1990 1989 Extraction and Recycle Equipment for Mobile Automotive Air-Conditioning Sy
41、stems SAE J2197 1991 HFC-134a (R-134a) Service Hose Fittings SAE J2209 1991 “Standard for Purity for Recycled HFC-134a for use in Mobile Air-Conditioning Systems SAE J2210 HFC-134a Recycling Equipment for Mobile Air-Conditioning Systems ARI Guideline K 1990 Cylinders for Recovered Fluorocarbon Refri
42、gerants CGA S-1.1 Pressure Relief Device Standards Cylinders for Compressed Gases CGA C-6 Standards for Visual inspection of Steel Compressed Gas Cylinders CGA C-6.1 Standards for Visual Inspection of High Pressure Aluminum Compressed Gas Cylinders DOT 39 DOT approved cylinder specifications (except
43、 those operating under exemptions) are found in 49 Code of Federal Regulations (CFR) sections 178.1 through 178.68. Part III Environmental Protection Agency, 40CFR Part 82 Protection of Stratospheric Ozone: Labeling Supplemental Proposal Final Rule UL1769 Cylinder Valves UL 1963 Standard for Refrigerant Recovery/Recycling Equipment, First Edition 1993, Copyright 1989 Developed by the SAE Interior Climate Control Standards Committee