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 theref
2、rom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2012 SAE International All rights reserved. No part of this pub
3、lication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970
4、(outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2384_201211SURFACEVEHICLERECOMMENDEDPRACTICEJ2384 NOV2012 Issued 1999-08Revised 201
5、2-11 Superseding J2384 JAN2006 Air Dryer Test Procedure RATIONALEMinor changes have been made in this five year review to cover new air dryer products that are now available in the market. 1. SCOPE This SAE Recommended Practice establishes uniform Test Procedures for desiccant Air Dryers used in veh
6、icles with compressed air systems per SAE J2383. Continuous flow desiccant Air Dryers are excluded from the scope of this document.2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the lates
7、t issue of SAE publications shall apply. 2.1.1 SAE Publication Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org.SAE J2383 Air Dryer Installation Procedure SAE J2721 Recommended Co
8、rrosion Test Methods For Commercial Vehicle Components 2.1.2 ASTM Publication Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.orgASTM B 117 Standard Test Method of Salt Spray (Fog) Testing SAE J2384 Revised NOV201
9、2 Page 2 of 7 3. DEFINITIONS Refer to SAE J2383 4. INSTRUMENTATION AND EQUIPMENT 4.1 Devices to measure temperature, 1.8 C (3 F). 4.2 Devices to measure pressure, 2% of indicated value. 4.3 A device to measure flow rate, 2% of indicated value. 4.4 A device to measure time, 0.5 s. 4.5 A device to mea
10、sure voltage, 2% of indicated value.4.6 A device to measure amperage, 2% of indicated value. 4.7 A device to control ambient temperature, 1.8 C (3 F). 4.8 A device(s) to heat and saturate air. 4.9 A device to measure dew point temperatures, 0.6 C (1 F). 4.10 A device to measure air leakage, 2% of in
11、dicated value. 4.11 A device to record or count cycles. 4.12 A 1/2 inch NPT pipe plug with a 1.5 mm 0.1 mm (0.06 in 0.004 in) orifice or equivalent. 4.13 Pressure reservoirs of 32.8, 49.2, and 65.6 L 2 L (2000, 3000, and 4000 in3 120 in3).4.14 A salt spray test unit capable of ASTM B 117. 4.15 A vib
12、ration test unit capable of controlling frequency sweeps and g loading. 5. AIR DRYER TEST PROCEDURES 5.1 Air Dryer Operation 5.1.1 Test Conditions Unless otherwise stated, test parameters will be as follows: a. Ambient Temp; 19 to 25 C (67 to 77 F) b. Mounting; As in Service c. Ambient Air Flow; non
13、ed. System Pressure; 9.0 to 9.7 bar (130 to 140 psig) e. Flow Rate; 455 to 510 slpm (16 to 18 scfm) SAE J2384 Revised NOV2012 Page 3 of 7 5.1.2 Pressure Relief Operation With the Outlet Port plugged and no pressure at the Control Port, apply increasing pressure to the Inlet Port at 0.7 to 1 bar/s (1
14、0 to 15 psi/s). Record the pressure at which the Inlet Port Pressure is relieved. Decrease the pressure at the Inlet Port at the rate of 0.7 to 1 bar/s (10 to 15 psi/s). Record the Inlet Port pressure at which the relief function closes (ifprovided).5.1.3 Turbo Cut-off Valve Operation With the Outle
15、t Port plugged and System Pressure at the Control Port, increase the pressure at the Inlet Port from 0 to System Pressure in 1 bar (15 psi) increments. Record the pressure at which the Inlet Port air leakage exceeds 100 sccm. 5.1.4 Regeneration Valve Operation (for System Purge Dryers Only) With the
16、 dryer Outlet Port piped to a 65 L 1 L (4000 in3 60 in3) reservoir, increase the pressure at the dryer Inlet Port to System Pressure. Apply System Pressure to the Control Port and record the pressure drop in the reservoir. Repeat with a 50 L 1 L (3000 in3 60 in3) reservoir in place of the 65 L reser
17、voir. 5.1.5 Heater and Thermostat Operation With the manufacturers specified voltage 1 V applied to the heater connection, record the heater wattage draw versus ambient temperature in 10 C (18 F) decreasing increments over the full range of the heater performance. Repeat for increasing temperature i
18、ncrements. 5.2 Dryer Performance 5.2.1 Pressure Drop During Charge With air flowing at 140, 280, and 420 slpm 10 slpm (5, 10, and 15 scfm 0.3 scfm) through the dryer and 8.3 bar 0.1 bar (120 psig 2 psig) maintained at the Outlet Port, record the difference in pressure between the Inlet and Outlet Po
19、rts. 5.2.2 Flow Capacity With 1.4 bar 0.1 bar (20 psig 1 psig) applied at the Inlet Port and the Outlet Port open, record the flow rate of air through the dryer. 5.2.3 Dryer Capacity Supply the dryer with air at 71 C 2 C (160 F 3 F), 340 slpm 10 slpm (12 scfm 0.3 scfm), and 97 to 100% RH. Connect th
20、e dryer Outlet Port to a test system as described in Figure 1 or equivalent. Cycle the air pressure in the test system through a 1.4 bar 0.1 bar (20 psig 1 psig) range at pressures between 6.8 to 8.4 bar (98 to 122 psig). The unload cycle time is to be 2 times greater than the load cycle time 1 s, f
21、or a 33% duty cycle. Cycle until the Dew Point Temperature of the air in the reservoirs has stabilized. Record the test system reservoir volume and the reservoir air DPD22, where DPD22 is the Dew Point Depression assuming the ambient temperature is 22 C (72 F). This assumption ignores the minor erro
22、r that will occur due to the actual ambient which is to be controlled between 19 to 25 C (67 to 77 F). Then increase the reservoir volume and repeat. Continue to increase the reservoir volume and repeat until the reservoir DPD22 is less than 17 C (30 F). Calculate the volume of air treated per cycle
23、 at which the reservoir air is at 17 C (30 F) DPD22. Then, for System Purge Air Dryers, subtract the purge volume. The resulting volume is the Dryer Capacity, expressed as Standard liters (scf). SAE J2384 Revised NOV2012 Page 4 of 7 FIGURE 1 - TEST SYSTEM Note that in the test system of Figure 1, th
24、e purpose of the bypass solenoid is to permit the continual flow of supply air tohelp maintain near constant dryer inlet temperatures. During the load cycle, the bypass solenoid is closed and supply air flows through the dryer. During the unload cycle, the bypass solenoid is open and the supply air
25、flows out to atmosphere. The purpose of the volume increase solenoid is to permit a controlled leak from the reservoir during the load cycle to simulate a larger reservoir.Note that the 32.8 L (2000 in3) reservoir volume in the test system of Figure 1 is important in determining the purge volume of
26、System Purge Air Dryers. For System Purge Air Dryers, the Dryer Capacity test may also be run with a larger reservoir in place of the 32.8 L reservoir, as long as the reservoir size used for the test is reported with the Dryer Capacityresult. Note that fresh desiccant may perform abnormally during i
27、nitial testing. To avoid this temporary condition, Capacity testing should be repeated until the results are stable. SAE J2384 Revised NOV2012 Page 5 of 7 5.2.4 Reserve Capacity Continue the testing in 5.2.3, further increasing the reservoir volume until the stabilized DPD22 is less than 5 C (9 F).
28、Calculate the volume of air treated per cycle at which the reservoir air is at 5 C (9 F) DPD22. Then, for System Purge Air Dryers, subtract the purge volume. Then subtract the Dryer Capacity. The resulting volume is the Reserve Capacity, expressed in Standard liters (scf). Note that fresh desiccant
29、may perform abnormally during initial testing. To avoid this temporary condition, Reserve Capacity testing should be repeated until the results are stable. 5.2.5 Recovery Continue the testing in 5.2.4 but with the test system reservoir volume set to the volume calculated as the Dryer Capacity. Cycle
30、 the test system until the reservoir DPD22 has reached 14 C (25 F). Recovery is the number of cycles necessary to change the reservoir DPD22 from 5 C (9 F) to 14 C (25 F). Note that fresh desiccant may perform abnormally during initial testing. To avoid this temporary condition, Recovery Capacity te
31、sting should be repeated until the results are stable. 5.2.6 Dryer Efficiency Dryer Efficiency (%) = 100 x Drying Capacity (5.2.3)/(Drying Capacity + Purge Volume). Note, both Drying Capacity and Purge Volumes are to be expressed in Standard liters (scf). Dryer capacity may be reported along with dr
32、yer efficiency. 5.3 Air Dryer Leakage 5.3.1 Assembly Leakage With the Outlet and Purge Tank Port plugged and the Control Port open, apply System Pressure to the Inlet Port. Measure and record the leakage. 5.3.2 Control Leakage With the Outlet and Inlet Ports open and the Purge Tank port plugged, app
33、ly System Pressure to the Control Port. Measure and record the leakage. 5.3.3 Outlet Leakage With the Inlet and Purge Tank Ports plugged, apply System Pressure to the Control and Outlet Ports. Measure and record the leakage of the pressure at the Outlet Port. 5.4 Environmental Test 5.4.1 Low Tempera
34、ture Leakage Condition the assembly for a minimum of 20 h at 40 C 1 C (40 F 2 F) with zero pressure applied. While maintaining the ambient and test air temperatures at 40 C 1 C (40 F 2 F), perform the leakage tests per 5.3. 5.4.2 Low Temperature Function With a 65 L 1 L (3965 in3 60 in3) reservoir a
35、t the Outlet, cycle the dryer, 1-min charge and 1-min purge, for a minimum of 8 h. Inlet air is to be at 50% 10% RH, 52 C 3 C (125 F 5 F), and 200 slpm 15 slpm (7 scfm 0.5 scfm). Stop the cycling with the Purge Valve closed and drop the ambient temperature to 18 C 1 C (0 F 2 F). After 12 h minimum,
36、activate the heater at rated 0.5 V, and re-start the dryer cycling. Record the cycles until the purge valve opens.SAE J2384 Revised NOV2012 Page 6 of 7 5.4.3 High Temperature Durability Cycle the dryer at the conditions of 5.1.1 and with dryer air inlet temperature at 80 C 5 C (176 F 9 F). Cycle the
37、 dryer at a rate between 5 and 40 cycles per minute for 100 000 cycles. During the test, the dryer outlet port is to have a 1.5 mm 0.1 mm (0.060 in 0.004 in) orifice to atmosphere or an equivalent method to insure that the Outlet Check Valve cycles. At the completion of the cycles, perform the leaka
38、ge tests of 5.3. Then disassemble the dryer and record any failed parts, signs of wear, fatigue, seal damage or desiccant breakdown. 5.5 Durability Test Cycle a dryer at the conditions of 5.1.1 except at rated System Pressure and without flow rate restriction. Cycle through full pressure sweeps up t
39、o within 0.3 bar (5 psi) of rated System Pressure and down to at most 0.3 bar (5 psi), for 1 000 000 cycles. Integral Purge Dryers may add a quick exhaust feature to help vent the purge volume and accelerate the test. During the test, the dryer outlet port must have a 1.5 mm 0.1 mm (0.060 in 0.004 i
40、n) orifice to atmosphere or an equivalent method to insure that the Outlet Check Valve cycles. At the completion of the cycles, test the dryer per of 5.1 and 5.3. Then disassemble the dryer and record any failed parts, signs of wear, fatigue, seal damage or desiccant breakdown.5.6 Corrosion Resistan
41、ce Test Commence test with the Dryer Ports plugged. Place the dryer in a salt spray chamber in an attitude equivalent to a vehicle application. Test dryer per ASTM B 117. After 205 h 5 h, test the dryer per 5.1, 5.3, and 5.8. Testing per SAE J2721 is optional between buyer and seller. 5.7 Overpressu
42、rization Test NOTE: This test is potentially dangerous and precautions should be taken to avoid operator injury in case of unit failure due to the high internal pressure. A structurally sound enclosure is recommended for this testing. This test may be done either pneumatically or hydrostatically.Com
43、mence test with the Outlet Port plugged and Control Port open. Eliminate the Relief Valve function from the dryer. Apply increasing pressure to the Inlet Port at a rate of 0.7 to 1 bar/s (10 to 15 psig/s) until failure. Then record the pressure at failure and the failure mode. Dryer unit should be “
44、as assembled” with desiccant containers, etc. included and pressure should flow to all potentially pressurized components. 5.8 Vibration Test Mount the Air Dryer in the same orientation and on the same bracket as on the intended vehicle. Install typical fittings and lines, clamped in typical fashion
45、. Vibrate the test unit in all three axis (x, y, z) through a frequency sweep from 5 to 25 Hzat 2.7 octave/min and at a constant 4 g loading, for 40 h. Record any damage at the end of the 40 h. Additionally, vibrate the test unit through a frequency sweep of 2 to 55 Hz and record any resonant freque
46、ncies. After completing the vibration test, test the dryer per 5.1 and 5.3. Then disassemble the dryer and record any failed parts, signs of wear, fatigue, seal damage or desiccant breakdown.SAE J2384 Revised NOV2012 Page 7 of 7 6. NOTES 6.1 Marginal Indicia A change bar (l) located in the left marg
47、in is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE TRUCK AND BUS BRAKE SUPPLY AND CONTROL COMPONENTS COMMITTEE OF THE SAE TRUCK AND BUS BRAKE AND STABILITY CONTROL COMMITTEE
