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 2015 SAE InternationalAll rights reserved. No part of this publi
3、cation 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 (out
4、side USA)Fax: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/ARP6223AEROSPACERECOMMENDED PRACTICEARP6223Issued 2015-08Oil Carbon Particulate TestRATIONALE
5、This SAE Aerospace Recommended Practice (ARP) is intended to provide acceptable procedure for qualification purposes to determine the tendency of aircraft lubricating oils to oxidatively degrade at elevated temperatures and pressures into products that form suspended fine carbon particles under engi
6、ne conditions. Properties of such particles may cause filters and other fine passages in the lubricant system to clog.1. SCOPEAn oil sample is placed into an open top glass vial which is then inserted into a stainless steel pressure vessel. The vessel is then sealed, pressurized, and placed into a h
7、eated aluminum block bath for 18 hours. At the end of the 18 hour time period, the vessel is removed from the heat source and allowed to cool to room temperature at which time the contents of the vial are filtered and the total sediment is reported as milligrams of sediment per 20 mL of oil.2. REFER
8、ENCESThere are no referenced publications specified herein.3. WARNINGThis document may involve hazardous materials, operations, and equipment. This document does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this document to establ
9、ish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.4. APPARATUS AND INSTRUMENTATION4.1 Pressure Cylinder and Cover (Test Vessel)The cylinder is solid stainless steel, approximately 10.75 inches (27 cm) tall, approximately 2 inches (5
10、 cm) outside diameter. It has an inside chamber that is 9.5 inches (24 cm) deep and a diameter of about 1 inch (2.5 cm). The cover holds the pressure gage, a pressure relief device, and the pressurizing connections. The vessel and cap assemblies are numbered and must remain together. Danko Precision
11、 Tool Co. in Aurora, Illinois, manufactures these vessels. A drawing of the vessel assembly is in Appendix A of this procedure should an equivalent vessel need to be manufactured. The insertion depth of the assembled vessel in the aluminum block bath must be 10 inches 1/8 inch (25.4 cm 0.3 cm).Space
12、rs should be made from a heat resistant material to accommodate apparatus that have hole depths greater than this.SAE INTERNATIONAL ARP6223 Page 2 of 54.2 Aluminum Block BathKoehler K35000 corrosiveness and oxidation stability bath (or equivalent), multiple positions, capable of maintaining 625 qF (
13、330 qC) to within 2 degrees. The bath is fitted with an independent over-temperature control unit and is placed into a Class 1 hood.4.3 OvenA gravity convection oven that is capable of maintaining 212 qF (100 qC) to within 1 degree for the purpose of drying the filter membranes.4.4 Analytical Balanc
14、eAn analytical balance that is capable of measuring objects to a precision of 0.01 mg.4.5 Dry Air SupplyCapable of providing 125 psi (0.862 MPa) with regulator, gage and quick connect fittings to match those on the pressure vessel.4.6 Graduated Cylinder50 mL graduated cylinder marked in 1 mL increme
15、nts.5. REAGENTS AND/OR MATERIALS5.1 Pyrex culture test tubes, 150 mm x 25 mm with screw cap, p/n Pyrex 9825-25.5.2 Acetone - technical and reagent grades.5.3 Filter papers, millipore 47 mm diameter, 0.50 micron, part number FHLP 047 00.5.4 Brushes of sufficient size to clean the vessels and tubing.5
16、.5 Detergent (Alconox or similar) for cleaning the graduated cylinders and filtration apparatus as needed.5.6 Anti-seize lubricant to ease vessel disassembly.5.7 Snoop leak detector to check the assembly for air leaks.6. PROCEDURE6.1 Preheat the aluminum block bath to 625 qF 2 qF (330 qC1qC). 6.2 Pr
17、e-clean the vessel body, cap, and attached plumbing with technical grade acetone and a brush until the surfaces are clean and all rinse solvent is clean. Rinse the test tube with technical grade acetone. Dry the test tube, vessel, cap, and attached plumbing with compressed air.6.3 Fill the cleaned t
18、est tube with 20 mL 2 mL of oil sample to be tested, use a 50 mL graduated cylinder or graduated syringe to measure the oil. The screw cap is not used inside the vessel, retain for use at the end of the test. Record the sample ID and vessel position.6.4 Lightly apply a very thin coat of anti-seize l
19、ubricant to the threads on the vessel body using the brush provided in the can or a similar small brush. 6.5 Carefully lower test tube with the sample into vessel body.SAE INTERNATIONAL ARP6223 Page 3 of 56.6 Place the properly matched cap on top of the vessel and tighten as much as possible by hand
20、. This will ensure that the sealing surfaces are properly mated and will seal. 6.7 Place the vessel in a vise or other appropriate holder (always maintain the vessel in the vertical position) and tighten the cap with a torque wrench to a minimum of 100 ft/lb (135 Nm) (this is the original torque use
21、d when pressure testing the vessel).6.8 Attach the assembled vessel to the pressurized air source via the quick disconnects with the valve closed. Pressurize the vessel to 125 psi 10 psi (0.862 MPa 0.07 MPa) by slowly opening the valve to minimize turbulence of the oil. 6.9 Close the valve on the ve
22、ssel and disconnect the air pressure source. 6.10 After a minimum of 1 hour, check the assembly for air leaks - there is a gage attached to the apparatus and minor leaks can be detected using the Snoop Leak detector. If any leaks are found, re-tighten the fittings affected using a higher torque than
23、 above. Repeat steps 6.7 through 6.10 as appropriate. Record the vessel pressures.6.11 Transfer the pressurized vessel to the pre-heated aluminum block bath and start the test clock for an 18-hour exposure. After 1 hour, check and record the vessel pressures. 6.12 After 18 hours, record the pressure
24、 of each vessel, then while wearing heat resistant gloves, remove the vessel from the aluminum block bath by placing it in a rack or other suitable heat resistant area and let cool in the hood for a minimum of 4 hours before depressurizing.6.13 After cooling and while in the hood, open the vessel va
25、lve slightly (until you just hear the leak) for a gentle release of pressure, letting the vessel fully depressurize before disassembly.6.14 Place the de-pressurized, cool vessel in a vise or appropriate holder and loosen the cap assembly with a wrench.6.15 In a hood, remove the loosened cap assembly
26、 from the vessel then remove the test tube carefully with steel tongs or forceps, gently wash the outside of the tube with Acetone into a clean pre-numbered beaker, then place a screw cap on the test tube and set the tube aside until ready for filtration.6.16 Rinse any oil that condensed inside the
27、vessel and cap assembly (outside the test tube) into the previously used pre-numbered beaker and set aside for filtration with the oil in the test tube. NOTE: Extra care should be taken to avoid washing any of the remaining anti-seize lubricant from the vessels into the beakers, as this will adverse
28、ly impact the total sediment amount.6.17 Filter the contents of both the test tube (first) and corresponding beaker with the condensed oil (second) from the vessel through a dry (stored in dessicator) pre-weighed (W1) to 0.01 mg, 0.50 micron millipore patch filter (47 mm diameter, FHLP 047 00) using
29、 a millipore vacuum filtration apparatus. Record all of the tared filter weights.6.18 Rinse the inside of the test tube and beaker with the reagent grade acetone to remove all oil and particles from the sides of the glassware through the filter.6.19 Wash sides of filtration funnel with additional re
30、agent grade acetone until all residual oil is removed from the funnel and patch filter.6.20 Remove the filter and put it into a glass Petri dish and place in the drying oven set at 212 qF (100 qC) for 1/2 hour. After drying is complete place the filter and Petri dish into a desiccator (1/2 hour mini
31、mum) until ready for weighing.6.21 Place the Petri dish containing the filter next to the balance for approximately 15 minutes to adjust to the humidity level of the laboratory. Weigh the filter to 0.01 mg (W2), subtract the pre-weight (W1) and report the particulate weight per 20 ml oil sample. Rec
32、ord all of the weights.SAE INTERNATIONAL ARP6223 Page 4 of 56.22 Record any comments or abnormalities found during the test along with conditions and persons completing the test.7. MEASUREMENTS7.1 Initial and final filter weights.8. CALCULATIONS AND REPORT ITEMS8.1 Determine the difference between t
33、he initial and final filter weights. Record this as the milligrams of sediment per 20 mL of oil.9. PRECISION9.1 A formal precision statement will be determined and added once sufficient statistical test data is compiled.10. NOTES10.1 A change bar (l) located in the left margin is for the convenience
34、 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 SAE COMMITTEE E-34, PROPULSION LUBRICANTS SAE INTERNATIONAL ARP6223 Page 5 of 5APPENDIX A - PART SCHEMATICSA.1 DRAWING FOR TEST VESSEL APPARATUSFigure A1 - Drawing for test vessel apparatus
