NAVISTAR CEMS DT-17-2013 Torque To Seal Test For Hydraulic Brake Lines.pdf

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1、This document is restricted and may not be snt outside Navistar, Inc. or eproduced without permision from Corprate Technical Standars. Supliers are rquired to asue al patet liailty. 2013 by Navistar, Inc. JUNE 2013 Page 1 of 2 NAVISTAR, INC. CEMS (CORPRATE NGIERING ATRIAL SPECIFCATION) NUMBER: CEMS

2、DT-17 TILE: Torque To Seal Test For Hydraulic Brake Lines CURENTISUE DATE:JN 2013 WRITEN/REVIWED BY: Materials Engiering APROVED BY: Materials Engiering SUPERSEDS ISUE OF: N/A PRINTED COPIES OF THIS DOCUENT UST BE VRIFED FOR CURENT REVISON This pecifcation may invole hazrdous materials, equipment, a

3、nd procedures. This pecifcation does not purport o adres al of te safty isues socited wit its se. Th usr is rsosible to cnslt apropriat safty halth racties an to trmine th plicabilty of regulatory limits prior to se. Cange Ntic: NEW 1.0 SCOPE Test method to detrmine the torque value to seal hydrauli

4、c brake line conection uder 250 psi. This tst is vali at 23C 5C. 2.0 RESTRICTED CHEMICAL SUBSTANCES Efective January 1, 207, al product suplied to the rquiremnts of this pecifcation must comply with t rqiremnts of the CES B-50 scifcatin. 3.0 REFRENCE DOCUMENTS Unles otherwise pecifed the latest isue

5、 of al refrence standars hal aply. The folwing spcifcatins and stanars ar rfrencd in this piftio. Nvistr CEMS B-50 4.0 APRATUS AND ATERIALS .1 test fixture shal be st up that wil have the capbilty to atch to ablunt end of a brake tube and impart prsrs of 250 psi (Hig tolernc of working presure of yd

6、rlic brak sytem). 4.2 The oposite nd of the brake tub wher presure is imartd shal inlude r tub asembly complt with t subject u nts and standar flar whic wil be te dsign bing evaltd. 4.3 A thread Saver nt or ther suitble iterfcing part il provi for the itrfce with te design bing eluatd (tube nut and

7、sction f lared tube). 4. A seali mchnism shal be provide with t trad saver as part of the tst fixture. .5 Wtr or Brake Oil sl usd in th test. 4.6 A minium of 6 samples hal be tstd. *Note: Parts undergo yielding when torqued together therfore new mating parts are nede after cmpltion f torqu tst. I ad

8、it, tr suld always b icrsi o giv tst. Th tub nut shuld t be losend from a given torque lvel nd re-torqued because f the yielding of the flared ns. NUMBER: CS DT-17 TILE orque To Seal Test For Hydraulic Brake Lines CURENT ISUE DATE: JN 2013 This document is restricted and may not be snt outside Navis

9、tar, Inc. or eproduced without permision from Corprate Technical Standars. Supliers are rquired to asue al patent liabilty. 2013 by Navistar, Inc. JUNE 2013 Page 2 of 2 5.0 PROCEDURE .1 Hand tighten the flared nd (sealing point), then record hand tight orque value. 5.2 Icrease prsur slowly util k bs

10、erved, if laking ocurs befre 250psi, rcord leaking presur.* 5.3 Relase presure in the tube and re-torque the flared nd by an icremnt of 1Nm (incremnt can be reducd or incrasd aftr agr o by ngiring). 5.4 Inrease presure slowly nd recrd at what presure it leaks if it does before 250psi. . Rpt sts 5.3

11、and 5.4 util torque vlue rachd rsults in o lak t 250psi. 5.6 Hold resure t 20psi for 10 mints and observe for ay leas. .7 If n laks observed after iutes t 250psi, sample is considerd as PAS and the torque value is the Sealing Torqu for the sample. 5.8 Tak a cros-sectin for ne saple of ach size tsted

12、 after test is complet and flared end is til tight o bserve any dfects i th thrads r flred nd. Note: The 2 mating parts (Flare and port cone) that engae to creat the sal ned to be rplaced if, in th course of testing, the nut is lsed. Torqu must b alwys incrsig t alw contiu dat t tak plac. Oce t tbe

13、nut is losend, the tst with te matig parts i completd ad ew mting hlves must b tsted for ay adital usful dat to b include in the statistical nlysi. *Note: Wrap joint with filter paer to bserve for any leaks, change filter paer after each leak curs. 6.0 REPORT .1 Torque values tarting with and tight

14、and then ading the 1Nm incremnts. 6.2 Presr whn smple laks t ec torque valu. .3 Saling torque valu. 7.0 TECHNICAL INFORMATION For further information related to the technical contt f this pecifction, cntact: Supliers may purchase controled cois of this spifati by ntacting: Materials Engiering and Technolgy Dept. 1040 W. North Aveue elrose Park, IL 60160 E-mail: MterialsEngieringN IHS Global Inc. 15 Invernes Way East Eglwod CO 8012-576 Phone: 1-80-54-79 E-mail: AutomtiveIHS.com Website: htp:/global.ihs.