1、Designation: D2713 13D2713 15Designation: 395/98395/98(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, t
2、he 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 antifreeze
3、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 Petroleum
5、(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,seconds, for a propane water test valve to freeze under the conditions of this test method.3.1.2 propane water test v
6、alve, 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 propan
7、e water 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
8、 in shorterfreeze-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 pressu
9、re-reducing 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 interfer
10、e with 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.1 This test method is under t
11、he jurisdiction ofASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of SubcommitteeD02.H0 on Liquefied Petroleum Gas.Current edition approved Oct. 1, 2013July 1, 2015. Published October 2013July 2015. Originally approved in 1968. Last previous ed
12、ition approved in 20122013 asD2713 12.D2713 13. DOI: 10.1520/D2713-13.10.1520/D2713-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary
13、 page on the ASTM website.This document is 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 th
14、at users consult prior editions as appropriate. 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 standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West
15、Conshohocken, PA 19428-2959. United States17. 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 prop
16、ane water test valve is a precision instrument 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 inspe
17、ction, reconditioning or recalibration.7.2 Stop Watch or Timer, measuring in seconds.7.3 LP Gas Sample Cylinder, of suitable volume. In order to perform multiple tests, a container having a minimum capacity of11 L (3 U.S. gal).11 L (3 U.S. gal) is typically required.7.4 Cloth, dry, clean.7.5 Connect
18、ion Tubing, clean pipe or metallic tubing for connecting the propane water test valve to the sample point or samplecylinder. 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 of L
19、P gas asit expands.9. Sampling9.1 Moisture test measurements on propane samples should be performed by connecting the test valve directly to the bulksupply if possible, rather than on samples taken from the bulk supply, due to the risk of uncontrollable sampling errors that canaffect the sensitivity
20、 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 directly 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 a
21、ccordance with directions given in PracticeD1265.10. Procedure10.1 Sample pressure, at the inlet to the test valve, shall not be more than 690 kPa (100 psi) 690 kPa (100 psi) above the vaporpressure of the product at the sample temperature. When sample source pressure is above this limit, use a liqu
22、id propane pressureregulator to hold the pressure, at the inlet to the test valve, within this limit.10.2 Connect (see 7.5) the propane water test valve to the liquid line of the bulk product source or to the liquid phase connectionof the sample cylinder (7.3), so that the body of the valve is horiz
23、ontal and the outlet opening is aimed vertically upward. The valveshall be positioned so that the internal surfaces of the outlet opening are clearly visible to the operator.10.2.1 Ensure that the lighting is sufficient to observe the end point of the test.10.3 Open the main valve on the sample sour
24、ce and set the valve on the test apparatus in the purge position. Purge the sampleline and the apparatus for 15 s.15 s.10.4 Close the test valve for 22 s or 3 s, 3 s, open it for 22 s or 3 s, 3 s, close it for 22 s or 3 s, 3 s, and continue this intermittentopening and closing until a uniform frost
25、cover has accumulated on the housing around the outlet of the test valve.10.5 Snap the valve to the test position and simultaneously start the stop watch.10.6 Stop the watch at the instant the liquid propane ceases to flow through the valve (Note 2). Any release of gas through thevalve, typically ac
26、companied by a “hissing” sound, shall not be interpreted as liquid flow.3 Supporting data have been filed at ASTM International Headquarters and may be obtained by requesting Research Report RR:D02-1423.D2713 152NOTE 2For information, liquid propane stops flowing through the test valve when frost fo
27、rms on the internal surface of the valve outlet, pluggingit. The higher the concentration of water in propane, the quicker the test valve will freeze off and plug. Under good lighting conditions, an experiencedoperator can sometimes be forewarned of this instant of liquid propane stoppage by watchin
28、g the frost line climb and roll over the lip of the valve outlet.Regardless of the observation of a climbing frost line, the end of the test is defined in 10.6 by the instant the liquid propane ceases to flow through thetest valve.10.7 Disregard the observed time for the initial freeze-off run. Quic
29、kly wipe the test valve outlet threads with a clean, dry cloth.10.8 Open the test valve to the purge position for about 15 s to ensure the removal of ice from the preset opening.NOTE 3Failure to purge the apparatus with the valve open to the purge position for about 15 s between tests will give erro
30、neous results. Purgingassures that ice formed in the preset opening in the preceding test will be removed.10.9 Repeat the operations as described in the trial run (beginning at 10.4) until three successive freeze-off times agree with eachother to within 65 s.65 s.NOTE 4For freeze-off times of less t
31、han 1 min, 1 min, this may require as many as seven or eight test runs.10.9.1 If the freeze-off time on two consecutive test runs is 90 s 90 s or greater, the test on the product may be discontinuedand the freeze-off time recorded as greater than 90 s.10.9.2 For freeze-off times shorter than 90 s, 9
32、0 s, record the average time for three consecutive determinations as the freeze-offtime, to the nearest whole second.11. Report11.1 If the valve does not freeze off within 60 s, 60 s, report the result as “pass” in accordance with this test method. If the valvedoes freeze off within 60 s, 60 s, repo
33、rt the result as a “fail” in accordance with this test method.12. Precision and Bias12.1 In the case of passfail data or results from other qualitative tests, no generally accepted method for determining precisionor bias is currently available.NOTE 5Data from a series of tests conducted in 1967 indi
34、cate the following: At moisture levels of 1414 ppm and 26 ppm, 26 ppm, all valves canbe expected to give freeze times over 3 min; 3 min; at a moisture level of 49 ppm 49 ppm it can be expected that none of the valves will give freezetimes over 18 s; 18 s; at a moisture level of 93 ppm 93 ppm it can
35、be expected that none of the valves will give freeze times over 5 s.5 s.NOTE 6The moisture concentrations in Note 5 are believed to be in parts per million (ppm) by mass, mg/kg, based on the solubility of water inpropane, which precludes the concentrations from being “ppm by volume.”12.2 BiasThe pro
36、cedure in this test method for measuring dryness of propane has no bias because the value of dryness isdefined only in terms of this test method.13. Keywords13.1 dryness; freeze valve; propane; waterSUMMARY OF CHANGESSubcommittee D02.H0 has identified the location of selected changes to this standar
37、d since the last issue(D2713D2713 1312) that may impact the use of this standard. (Approved Oct. 1, 2013.)July 1, 2015.)(1) ProcedureThe 10.2.1 was added, andIP jointed method was updated to 10.6 and 395/98(04).Note 2 were revised for clarity.(2) Subsection 7.3, LP Gas Sample Cylinder, was revised t
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