ASTM_F_434_-_93_2009.pdf

Designation:F43493(Reapproved 2009)Standard Test Method forBlow-Out Testing of Preformed Gaskets1This standard is issued under the fixed designation F434;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the resis-tance against blow-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 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 use.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 between 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.Provisions 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 105m3/s(40 in.3/min)against 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.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 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,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 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 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 of ASTM Committee F03 on Gasketsand is the direct responsibility of Subcommittee F03.20 on Mechanical TestMethods.Current edition approved Oct.1,2009.Published March 2010.Originallyapproved in 1975.Last previous edition approved in 2003 as F434 93(2003)1.DOI:10.1520/F0434-93R09.2Available 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.,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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 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 inlet 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 pressure before doing any work,suc