ASTM D2713-2012 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:D271311 Designation: D2713 12Designation: 395/98Standard 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,
2、 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 dryness of propane products that do not contain antifreez
3、e agents such as,but not limited to, commercial propane and special duty propane (see Specification D1835).1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns
4、, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1265 Practice for Sampling Liquefied Petroleu
5、m (LP) Gases, Manual MethodD1835 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 water test valve to freeze under the conditions of this test method.3.1.2 propane water test valve,
6、na specific valve designed and manufactured for performing in this test method.3.1.3 valve freeze, adjrelating to the procedure for determining the dryness of propane for this test method.4. Summary of Test Method4.1 Aliquid-phase sample of the product to be tested is flowed through the propane wate
7、r test valve to cool the valve body.Aftercooling, the test valve is partially closed to a small preset flow rate and the time required for the valve to freeze, due to waterdissolved in the sample and thus interrupt the normal flow, is recorded. Higher dissolved water concentrations will result in sh
8、orterfreeze-off times. The average observed time for several successive observations is recorded as the observed valve freeze time.5. Significance and Use5.1 This test is a functional test in which the water concentration in the product is related to product behavior characteristicsin a pressure-red
9、ucing system of special design to arrive at a measure of product acceptability in common use applications.Experience has demonstrated that excessive water content (dissolved water) will cause freeze-up difficulties in pressure reducingsystems.6. Interferences6.1 Antifreeze agents will interfere with
10、 this test method and can indicate that the product is drier than it really is. However,the relative freeze-off times of such materials tested by this procedure can be an indication of the tendency of these products tocause freezing in pressure-reducing regulators.1This test method is under the juri
11、sdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.H0 onLiquefied Petroleum Gas.Current edition approved May 1, 2011.April 15, 2012. Published May 2011.2012. Originally approved in 1968. Last previous edition approved in 20072011
12、asD271307.D271311. DOI: 10.1520/D2713-112.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is
13、 not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropr
14、iate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United State
15、s.7. Apparatus7.1 Propane Water Test Valve3A specially constructed and calibrated 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 instr
16、ument and it should be so treated. It should not be dropped, strained in any way, ordisassembled, except to clean the filter in accordance with the manufacturers instructions. Valves suspected of being defective should be returned to themanufacturer for inspection, reconditioning or recalibration.7.
17、2 Stop Watch or Timer, measuring in seconds.7.3 LP Gas Sample Cylinder, having a minimum capacity of 11 L (3 U.S. gal).7.4 Cloth, dry, clean.7.5 Connection Tubing, clean pipe or metallic tubing for connecting the propane water test valve to the sample point or samplecylinder. Do not use a rubber hos
18、e or plastic-lined hose.8. Hazards8.1 The primary hazards of handing propane are fire, explosion, and freezing “burns” due to the autorefrigeration of LP gas asit expands.9. Sampling9.1 Moisture test measurements on propane samples should be performed by connecting the test valve directly to the bul
19、ksupply if possible, rather than on samples taken from the bulk supply, due to the risk of uncontrollable sampling errors that canaffect 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 apparatus direc
20、tly to the bulk propane supply, a sample may be taken into a clean,dry sample cylinder (7.3). In such cases, the sample shall be collected strictly in accordance with directions given in PracticeD1265.10. Procedure10.1 Sample pressure, at the inlet to the test valve, shall not be more than 100 psi (
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