ASTM D2713-2007 Standard Test Method for Dryness of Propane (Valve Freeze Method)《丙烷干燥性的标准试验方法(阀冻结法)》.pdf
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1、Designation: D 2713 07Designation: 395/98An American National StandardStandard Test Method forDryness of Propane (Valve Freeze Method)1This standard is issued under the fixed designation D 2713; the number immediately following the designation indicates the year oforiginal adoption or, in the case o
2、f revision, the year of last revision. 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
3、 antifreeze agents suchas, but not limited to, commercial propane and special dutypropane (see Specification D 1835).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
4、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 Standards:2D 1265 Practice for Sampling Liquef
5、ied Petroleum (LP)Gases, Manual MethodD 1835 Specification for Liquefied Petroleum (LP) Gases3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 freeze-off time, nthe time, in s, for a propane watertest valve to freeze under the conditions of this test method.3.1.2 propane water t
6、est valve, na specific valve designedand manufactured 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 p
7、ropane water test valve to cool the valvebody. After cooling, 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 r
8、esult in shorter freeze-off times. The averageobserved time for 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
9、 pressure-reducing system of special design to arriveat a measure 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
10、 interfere with this test methodand can indicate that the product 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 Propan
11、e Water Test Valve3Aspecially constructed andcalibrated valve manufactured 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.NOTE 1The propane water test valve is a precision instrument and itshould be so tr
12、eated. It should not be dropped, strained in any way, ordisassembled, except 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, mea
13、suring in seconds.7.3 LP Gas Sample Cylinder, having a minimum capacity of11 L (3 U.S. gal).1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.H0 on Liquefied Petroleum Gas.Current edition approved
14、 Dec. 15, 2007. Published January 2008. Originallyapproved in 1968. Last previous edition approved in 2001 as D 2713 91 (2001).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information
15、, 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: D021423.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr
16、 Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 pr
17、imary hazards of handing propane are fire,explosion, and freezing “burns” due to the autorefrigeration ofLP gas as it expands9. Sampling9.1 Moisture test measurements on propane samples shouldbe performed by connecting the test valve directly to the bulksupply if possible, rather than on samples tak
18、en from the bulksupply, due to the risk of uncontrollable sampling errors thatcan affect the sensitivity of moisture test measurements.Referee tests should be conducted on the bulk supply.9.2 If the test cannot be run by connecting the apparatusdirectly to the bulk propane supply, a sample may be ta
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