1、 AEROSPACE STANDARD HOSE ASSEMBLY, PTFE, ARAMID REINFORCED STANDARD DUTY,21 000/28 000 KPA, 135 C, TITANIUM FITTINGS, FLARELESS, INCLUDING JUMP SIZES, STRAIGHT TO STRAIGHT, METRIC MA4568Copyright 2015 SAE International All rights reserved. No part of this publication may be reproduced, stored in a r
2、etrieval 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 (outside USA) Fax: 724-776-0790 Email: Cu
3、stomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org ISSUED 1994-05REAFFIRMED2015-04THIRD ANGLE PROJECTION CUSTODIAN: G-3/G-3D FEDERAL SUPPLY CLASS 4720MA4568 SHEET 1 OF 6 PROCUREMENT SPECIFICATION: /2/ MA1975SAE Technical Standards Board Rules provide that: “This report ispublished by SAE toadva
4、nce thestate of technicalandengineering sciences. Theuse ofthisreport is entirelyvoluntary, andits applicability and suitability forany particularuse,including any patent infringement arising therefrom, isthe soleresponsibilityofthe user.”SAE reviews eachtechnicalreport at least every five years at
5、which time itmay berevised,reaffirmed, stabilized, orcancelled. SAE invites yourwrittencomments andsuggestions. SAE values your input. To provide feedbackon this Technical Report, please visit http:/www.sae.org/technical/standards/MA4568 RATIONALE MA4568 HAS BEEN REAFFIRMED TO COMPLY WITH THE SAE FI
6、VE-YEAR REVIEW POLICY. FIGURE 1 - FLARELESS HOSE ASSEMBLY, STRAIGHT TO STRAIGHTAEROSPACE STANDARD MA4568 SHEET 2 OF 6 HOSE ASSEMBLY, PTFE, ARAMID REINFORCED STANDARD DUTY, 21 000/28 000 KPA, 135 C, TITANIUM FITTINGS, FLARELESS, INCLUDING JUMP SIZES, STRAIGHT TO STRAIGHT, METRIC TABLE 1 - ASSEMBLY DI
7、MENSIONS IN MMAEROSPACE STANDARD MA4568 SHEET 3 OF 6 HOSE ASSEMBLY, PTFE, ARAMID REINFORCED STANDARD DUTY, 21 000/28 000 KPA, 135 C, TITANIUM FITTINGS, FLARELESS, INCLUDING JUMP SIZES, STRAIGHT TO STRAIGHT, METRIC TABLE 2 - HOSE OR SLEEVE OUTSIDE DIAMETER /10/TABLE 3 - ASSEMBLY PROCUREMENT LENGTH AN
8、D TOLERANCESAEROSPACE STANDARD MA4568 SHEET 4 OF 6 HOSE ASSEMBLY, PTFE, ARAMID REINFORCED STANDARD DUTY, 21 000/28 000 KPA, 135 C, TITANIUM FITTINGS, FLARELESS, INCLUDING JUMP SIZES, STRAIGHT TO STRAIGHT, METRIC TABLE 4 - MAXIMUM HOSE AND FITTING WEIGHTSAEROSPACE STANDARD MA4568 SHEET 5 OF 6 HOSE AS
9、SEMBLY, PTFE, ARAMID REINFORCED STANDARD DUTY, 21 000/28 000 KPA, 135 C, TITANIUM FITTINGS, FLARELESS, INCLUDING JUMP SIZES, STRAIGHT TO STRAIGHT, METRIC NOTES:1. MATERIALS:a. HOSE AND FITTINGS: PER MA1975b. SLEEVES: SEE APPLICABLE STANDARDS, TABLE 2/2/ THIS HOSE ASSEMBLY SHALL BE QUALIFIED IN ACCOR
10、DANCE WITH PROCUREMENT SPECIFICATION MA1975. USERS OF THIS STANDARD ARE ADVISED TO CONTROL SOURCE APPROVAL(S) BY STANDARD PAGE SUPPLEMENT SHEET OR SIMILAR MEANS.3. CONSTRUCTION AND PERFORMANCE: PER MA1975. FITTINGS SHALL BE PERMANENTLY ATTACHED TO THE HOSE.4. OPERATING CHARACTERISTICS: PER MA1975.5.
11、 MARKING: MARKING SHALL BE PER MA1975 ON A STAINLESS STEEL BAND NOT OVER 25.4 mm WIDE OR ON THE COLLAR. THE CHARACTERS SHALL BE A MINIMUM OF 1.6 mm HIGH. THE BAND SHALL BE SO DESIGNED AS TO REMAIN TIGHT ON THE HOSE TO PREVENT RELATIVE MOVEMENT AND RESULTANT CHAFING. IT SHALL BE OF SUFFICIENT STRENGT
12、H TO PREVENT REMOVAL BY HAND. HOSE ASSEMBLY DATE AND “PT” SYMBOL SHALL BE ELECTROETCHED ON THE BAND OR ON AN END FITTING OR A FIRESLEEVE CLAMP. MARKING BAND SHALL BE COVERED WITH TRANSPARENT POLYOLEFIN SHRINK SLEEVE PER AS1073 CODE A./6/ HOSE LENGTH: LENGTH “L” IS A FOUR DIGIT NUMBER DESCRIBING THE
13、HOSE ASSEMBLY LENGTH IN MILLIMETERS. LENGTH “L” IS MEASURED FROM “GAGE DIAMETER” TO “GAGE DIAMETER”. FOR LENGTH INCREMENTS AND TOLERANCES SEE TABLE 3. TO CONVERT “GAGE DIAMETER” TO “GAGE DIAMETER” TO “END TO END” MEASUREMENT, ADD TWO TIMES “D” TO LENGTH “L”. /7/ A TRUE CIRCULAR CROSS SECTION IS NOT
14、REQUIRED THROUGH THE FITTING ID. HOWEVER, THE APPLICABLE BALL DIAMETER LISTED IN TABLE 1 MUST BE CAPABLE OF PASSING THROUGH THE HOSE ASSEMBLY./8/ DISTANCE ACROSS CORNERS OF THE HEX MAY EXCEED THIS DIMENSION./9/ FITTING ENDS SIZE: DN6 THROUGH DN40 MUST COMPLY TO MA1975. FITTINGS SHALL MATE WITH MA209
15、5 (ISO 7321/2) AND MA2096 (ISO 7321/2). STANDARD COUPLING NUTS SHALL BE IN ACCORDANCE WITH OR EQUIVALENT TO MA2047 (ISO 7321). NUTS SHALL MEET TORQUE REQUIREMENTS PER MA2140./10/ CLAMP DIAMETERS: DIAMETERS ARE LISTED FOR CLAMP SELECTION. TUBULAR SLEEVES MAY NOT BE A PERFECT ROUND AND SHALL BE MEASUR
16、ED WITH A METRIC DIAMETER TAPE RULE (OFTEN REFERRED TO AS A PI-TAPE)./11/ SLEEVE DIAMETERS: THE TABLE 2 SLEEVE DIAMETERS FOR AS1072 SLEEVES APPLY WHEN THE SLEEVE IS COMPRESSED, OR CLAMPED, TO CONTACT THE HOSE. IN THIS CASE, A WRINKLE MAY OCCUR OVER APPROXIMATELY 10% OF THE SLEEVE CIRCUMFERENCE./12/
17、FIRESLEEVE: THE CUT ENDS OF THE FIRESLEEVE SHALL BE COATED WITH RTV SILICONE RUBBER PRIOR TO INSTALLATION TO PREVENT WICKING OF FLUIDS. THE FIRESLEEVE ENDS SHALL BE SECURED TO THE HOSE ASSEMBLY END FITTINGS WITH CORROSION RESISTANT STEEL BANDS. AFTER INSTALLATION, CRACKS OR VOIDS IN THE FIRESLEEVE,
18、WHICH EXPOSE THE FIBERGLASS, SHALL BE COATED WITH RTV SILICONE RUBBER./13/ FIRESLEEVE ENDS: THE ENDS OF THE INTEGRAL FIRESLEEVE SHALL BE COVERED WITH SILICONE EXTENDING OVER THE END FITTING COLLAR.14. IDENTIFICATION MARKING: ADD “AS1055 TYPE IIb CLASS II” TO IDENTIFICATION MARKING TO SHOW LEVEL OF C
19、OMPLIANCE, “FIRE RESISTANT 135 C (5 min), WITH AS1055”./15/ JUMP SIZE CODE EXPLANATION:a. R - STEP DOWN 1 STANDARD LETTER SIZE PER TABLE 1 (REDUCER)b. S - HOSE SIZE (NO REDUCTION OR EXPANSION)c. E - STEP UP 1 STANDARD LETTER SIZE PER TABLE 1 (EXPANDER)NOTE: WHEN FITTING SIZE CHANGES EXIST, SPECIFY S
20、MALLER FITTING PRIOR TO THE LARGER FITTING IN THE PART NUMBER./16/ WHEN FIRESLEEVES ARE REQUIRED, WEIGHT LIMITS SHALL BE DEFINED BY THE PROCURING ACTIVITY./17/ TITANIUM PARTS MAY BE REPLACED WITH STAINLESS STEEL IF MAXIMUM WEIGHT FOR FITTING IS NOT EXCEEDED.AEROSPACE STANDARD MA4568 SHEET 6 OF 6 HOS
21、E ASSEMBLY, PTFE, ARAMID REINFORCED STANDARD DUTY, 21 000/28 000 KPA, 135 C, TITANIUM FITTINGS, FLARELESS, INCLUDING JUMP SIZES, STRAIGHT TO STRAIGHT, METRIC NOTES (Continued):18. DIMENSIONING AND TOLERANCING: ANSI Y14.5M19. LOCKWIRE HOLES LOCATION AND DIAMETER PER MA2126 CODED AS FOLLOWS:a. U = TWO HOLES 180 APARTb. W = THREE HOLES 120 APART20. THIS PART STANDARD TAKES PRECEDENCE IN CASES OF CONFLICT.21. EXAMPLE OF PART NUMBER:
