ASTM D1267-02

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An American National Standard
Designation: D 1267 – 02
Standard Test Method for
Gage Vapor Pressure of Liquefied Petroleum (LP) Gases
1
(LP-Gas Method)
This standard is issued under the fixed designation D 1267; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope or both, (Warning—Extremely flammable. Harmful when
inhaled.) butanes and butylenes, or both, in which the content
1.1 This test method covers the determination of the gage
of hydrocarbon compounds of higher boiling point than 0°C
vapor pressures of liquefied petroleum gas products at tem-
(32°F) is less than 5 % by liquid volume, and whose gage
peratures of 37.8°C (100°F) up to and including a test
vapor pressure at 37.8°C (100°F) is not greater than approxi-
temperature of 70°C (158°F).
mately 1550 kPa (225 psi).
1.2 The values stated in acceptable metric units are to be
regarded as the standard. The values in parentheses are for
4. Summary of Test Method
information only.
4.1 The test apparatus, consisting of two interconnected
1.3 This standard does not purport to address all of the
chambersandequippedwithasuitablepressuregage,ispurged
safety concerns, if any, associated with its use. It is the
with a portion of the sample which is then discarded. The
responsibility of the user of this standard to establish appro-
apparatus is then filled completely with the portion of the
priate safety and health practices and determine the applica-
sample to be tested. Thirty-three and one-third to forty volume
bility of regulatory limitations prior to use. For specific hazard
percent of the sample content of the apparatus is immediately
statements, see 3.2.1 and Annex A2.
withdrawn to provide adequate free space for product expan-
2. Referenced Documents sion. The apparatus is then immersed in a water bath main-
tained at the standard test temperature of 37.8°C (100°F) or,
2.1 ASTM Standards:
optionally, at some higher test temperature up to and including
D 323 Test Method for Vapor Pressure of Petroleum Prod-
2
a test temperature of 70°C (158°F).
ucts (Reid Method)
4.2 The observed gage pressure at equilibrium, after cor-
D 1265 Practice for Sampling Liquefied Petroleum (LP)
2
recting for gage error and correcting to a standard barometric
Gases (Manual Method)
3 pressure, is reported as the LPG Vapor Pressure at the selected
E 1 Specification for ASTM Thermometers
test temperature.
2.2 Institute of Petroleum Standard:
4
IP 181 Sampling Petroleum Gases
5. Significance and Use
3. Terminology 5.1 Information on the vapor pressures of liquefied petro-
leum gas products under temperature conditions from 37.8 to
3.1 Definitions:
70°C (100 to 158°F) is pertinent to selection of properly
3.1.1 vapor pressure—the pressure exerted by the vapor of
designed storage vessels, shipping containers, and customer
a liquid when in equilibrium with the liquid.
utilizationequipmenttoensuresafehandlingoftheseproducts.
3.2 Definitions of Terms Specific to This Standard:
5.2 Determination of the vapor pressure of liquefied petro-
3.2.1 liquefied petroleum gases—narrow boiling range hy-
leum gas is important for safety reasons to ensure that the
drocarbon mixtures consisting chiefly of propane or propylene,
maximum operating design pressures of storage, handling, and
fuel systems will not be exceeded under normal operating
1
This test method is under the jurisdiction of ASTM Committee D02 on temperature conditions.
PetroleumProductsandLubricants andisthedirectresponsibilityofSubcommittee
5.3 For liquefied petroleum gases, vapor pressure is an
D02.H on Liquefied Petroleum Gas.
indirect measure of the most extreme low temperature condi-
Current edition approved April 10, 2002. Published June 2002. Originally
e1
tionsunderwhichinitialvaporizationcanbeexpectedtooccur.
published as D 1267 – 53 T. Last previous edition D 1267 – 95 (2001) .
2
Annual Book of ASTM Standards, Vol 05.01.
It can be considered a semi-quantitative measure of the amount
3
Annual Book of ASTM Standards, Vol 14.03.
of the most volatile material present in the product.
4
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D 1267
6. Apparatus as the pressure of the sample source, momentarily open the
bleeder valve. If liquid does not promptly emerge, repeat the
6.1 Vapor Pressure Apparatus, constructed as illustrated in
purging step (9.2). If liquid appears immediately, close the
Fig. A1.1, and the various items of auxi
...