1、Designation:D271315Designation:395/98(04)Standard Test Method forDryness of Propane(Valve Freeze Method)1This standard is issued under the fixed designation D2713;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revis
2、ion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers the measurement of the drynessof propane products that do not contain antifreeze agents suchas,but not limit
3、ed to,commercial propane and special dutypropane(see Specification D1835).1.2 The values stated in SI units are to be regarded as thestandard.The values in parentheses are for information only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It i
4、s 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 Standards:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1835 Specifi
5、cation for Liquefied Petroleum(LP)Gases3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 freeze-off time,nthe time,in seconds,for a propanewater test valve to freeze under the conditions of this testmethod.3.1.2 propane water test valve,na specific valve designedand manufactured
6、for performing in this test method.3.1.3 valve freeze,adjrelating to the procedure for deter-mining the dryness of propane for this test method.4.Summary of Test Method4.1 A liquid-phase sample of the product to be tested isflowed through the propane water test valve to cool the valvebody.After cool
7、ing,the test valve is partially closed to a smallpreset flow rate and the time required for the valve to freeze,due to water dissolved in the sample and thus interrupt thenormal flow,is recorded.Higher dissolved water concentra-tions will result in shorter freeze-off times.The averageobserved time f
8、or several successive observations is recordedas the observed valve freeze time.5.Significance and Use5.1 This test is a functional test in which the water concen-tration in the product is related to product behavior character-istics in a pressure-reducing system of special design to arriveat a meas
9、ure of product acceptability in common use applica-tions.Experience has demonstrated that excessive water con-tent(dissolved water)will cause freeze-up difficulties inpressure reducing systems.6.Interferences6.1 Antifreeze agents will interfere with this test methodand can indicate that the product
10、is drier than it really is.However,the relative freeze-off times of such materials testedby this procedure can be an indication of the tendency of theseproducts to cause freezing in pressure-reducing regulators.7.Apparatus7.1 Propane Water Test Valve3Aspecially constructed andcalibrated valve manufa
11、ctured solely for this test(Note 1).Thevalve has two open positions,a wide open position for flushing,and a small preset flow position for testing.NOTE1The propane water test valve is a precision instrument and itshould be so treated.It should not be dropped,strained in any way,ordisassembled,except
12、 to clean the filter in accordance with the manufac-turers instructions.Valves suspected of being defective should bereturned to the manufacturer for inspection,reconditioning or recalibra-tion.7.2 Stop Watch or Timer,measuring in seconds.7.3 LP Gas Sample Cylinder,of suitable volume.In order toperf
13、orm multiple tests,a container having a minimum capacityof 11 L(3 U.S.gal)is typically required.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.H0 on Liquefied Petroleum Gas.Current
14、 edition approved July 1,2015.Published July 2015.Originally approvedin 1968.Last previous edition approved in 2013 as D2713 13.DOI:10.1520/D2713-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards
15、volume information,refer to the standards Document Summary page onthe ASTM website.3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1423.*A Summary of Changes section appears at the end of this standardCopyright ASTM Internat
16、ional,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.4 Cloth,dry,clean.7.5 Connection Tubing,clean pipe or metallic tubing forconnecting the propane water test valve to the sample point orsample cylinder.Do not use a rubber hose or plastic-lined hose.8.Hazards8.1 The primary hazards of handing propane are fire,explosion,and freezing“burns”due to the autorefrigeration ofLP gas as it expands.9.Sampling9.1 Moisture test measurements on propane samples shouldbe pe
