1、Designation: F 434 93 (Reapproved 2003)e1Standard Test Method forBlow-Out Testing of Preformed Gaskets1This standard is issued under the fixed designation F 434; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTESection 2 was included editorially in April 2006.1. Scope1.1 This test method covers the determination of the resis-tance against bl
3、ow-out of preformed gaskets. The test isconducted under ambient conditions and should be used forcomparison purposes only to select suitable designs andconstructions for specific applications.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for
4、 informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to us
5、e.2. Referenced Documents2.1 ASTM Adjuncts:Detailed Drawings of Test Unit23. Significance and Use3.1 This test method is designed to compare all types ofpreformed gaskets under controlled conditions with respect toblow-out resistance. This test method may be used as a routinetest when agreed upon be
6、tween the purchaser and the seller.4. Apparatus4.1 Pressure Supply, capable of 7 MPa (1000 psi), prefer-ably hydraulic, and with proper safety precautions, in the eventof a rapid-gasket failure.4.2 Test Unit,3capable of withstanding 7 MPa (1000 psi)internal pressure under ambient conditions. Provisi
7、ons shouldbe made for valve and pressure gage mountings, as shown inFig. 1. The gage shall read from 0 to 7 MPa (0 to 1000 psi) andbe mounted so as to be visible at some distance.4.3 Booster PumpAn air-operated hydraulic (water) pres-sure pump, capable of delivering 1.1 3 105m3/s (40 in.3/min)agains
8、t a back pressure of 35 MPa (5000 psi).4.4 Temperature Indicating DeviceA thermometer ca-pable of reading 1C (2F) in the ambient temperature range.5. Test Specimen5.1 The specimen shall be a 102 mm (4-in.) nominal-sizegasket 114 mm (4.5 in.) in inside diameter by 165 mm (6.5 in.)in outside diameter.
9、 The thickness of the test gasket willdepend upon its expected usage and must be specified in thereport, as results will vary accordingly.6. Procedure6.1 Assemble the specimen in the test unit.6.2 The bolt threads should be well lubricated using moly-disulfide dry film or grease. Sanding the bottom
10、of the boltheads and the washers will reduce torque variable and ensureduplication of results.6.3 Tighten the bolts, using the sequence shown in Fig. 2,increasing the torque loading in 25 % increments to thetargeted torque, but do not exceed the rating on the bolts.6.4 Fill the test unit with water,
11、 and bleed out all excess airby tilting until no further air bubbles are forthcoming.6.5 Fill the oil reservoir (thermowell) three-quarters full oflight oil. Allow 15 min for the temperature to stabilize, andinsert the temperature sensor.6.6 Before applying hydrostatic pressure, cover the entiretest
12、 receptacle with a metal shield, leaving the gage exposedfor the recording of data.6.7 Attach a water hose from the booster pump, andgradually apply water pressure. This should be done under safeconditions, as follows:6.7.1 The operator should be wearing suitable safety equip-ment,6.7.2 The control
13、valve should be located at a safe distancefrom the test area, and6.7.3 Quick and violent pressure surges should be avoided.1This test method is under the jurisdiction ofASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.20 on Mechanical TestMethods.Current edition appr
14、oved Oct. 1, 2003. Published October 2003. Originallyapproved in 1975. Last previous edition approved in 1997 as F 434 93(1997).2Available from ASTM International Headquarters. Order Adjunct No.ADJF0434.3The sole source of supply of the apparatus known to the committee at this timeis the Pfaudler Co
15、., PO Box 1600, Rochester, NY 14603. If you are aware ofalternative suppliers, please provide this information to ASTM InternationalHeadquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee,1which you may attend.1Copyright ASTM International, 1
16、00 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.8 Discontinue the application of pressure when 7 MPa(1000 psi) has been reached.6.9 Should blow-out occur before the maximum test pres-sure is obtained, record the maximum gage pressure reached.6.10 Close off the in
17、let valve, and allow the unit to stand atroom temperature for 20 h. Record pressure gage readings at 1,2, 3, 4, and 24 h intervals. Record temperatures along withpressure readings. Since a closed system results, the absolutepressure will be proportional to the absolute temperature.6.11 Release the p
18、ressure before doing any work, such asdismantling, adjusting, etc. on the test unit.7. Report7.1 Report the following information.7.1.1 Identification of gasket,7.1.2 Specimen thickness,7.1.3 Pressure at which blow-out occurred, if it occurred,7.1.4 Indication that the test gasket withstood the maxi
19、mumapplied pressure, if this was the case,7.1.5 Pressure readings versus time, if the entire test proce-dure was concluded, and7.1.6 Temperature readings at the time the pressure figureswere recorded.8. Precision and Bias8.1 Since the results of this test are reported as visualobservations, no preci
20、sion or bias statements are possible.9. Keywords9.1 gasket blow-out; hydrostatic pressure; preformedgasketsFIG. 1 Test UnitNOTETighten bolts evenly: follow numerical sequence.FIG. 2 Bolt Tightening ProgressionF 434 93 (2003)e12ASTM International takes no position respecting the validity of any paten
21、t rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision a
22、t any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your commen
23、ts will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted
24、by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).F 434 93 (2003)e13
