ASTM D1267-95(2001)e1
(Test Method)Standard Test Method for Gage Vapor Pressure of Liquefied Petroleum (LP) Gases (LP-Gas Method)
Standard Test Method for Gage Vapor Pressure of Liquefied Petroleum (LP) Gases (LP-Gas Method)
SCOPE
1.1 This test method covers the determination of the gage vapor pressures of liquefied petroleum gas products at temperatures of 37.8°C (100°F) up to and including a test temperature of 70°C (158°F).
1.2 The values stated in acceptable metric 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, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 3.2.1 and Annex A2.
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e1
Designation: D 1267 – 95 (Reapproved 2001) An American National Standard
Standard Test Method for
Gage Vapor Pressure of Liquefied Petroleum (LP) Gases
(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.
e NOTE—Warning notes were placed in the text editorially in May 2001.
1. Scope of hydrocarbon compounds of higher boiling point than 0°C
(32°F) is less than 5 % by liquid volume, and whose gage
1.1 This test method covers the determination of the gage
vapor pressure at 37.8°C (100°F) is not greater than approxi-
vapor pressures of liquefied petroleum gas products at tem-
mately 1550 kPa (225 psi).
peratures of 37.8°C (100°F) up to and including a test
temperature of 70°C (158°F).
4. Summary of Test Method
1.2 This standard does not purport to address all of the
4.1 The test apparatus, consisting of two interconnected
safety concerns, if any, associated with its use. It is the
chambers and equipped with a suitable pressure gage, is purged
responsibility of the user of this standard to establish appro-
with a portion of the sample which is then discarded. The
priate safety and health practices and determine the applica-
apparatus is then filled completely with the portion of the
bility of regulatory limitations prior to use. For specific hazard
sample to be tested. Thirty-three and one-third to forty volume
statements, see3.2.1 and Annex A2.
percent of the sample content of the apparatus is immediately
1.3 The values stated in acceptable metric units are to be
withdrawn to provide adequate free space for product expan-
regarded as the standard. The values in parentheses are for
sion. The apparatus is then immersed in a water bath main-
information only.
tained at the standard test temperature of 37.8°C (100°F) or,
2. Referenced Documents optionally, at some higher test temperature up to and including
a test temperature of 70°C (158°F).
2.1 ASTM Standards:
4.2 The observed gage pressure at equilibrium, after cor-
D 323 Test Method for Vapor Pressure of Petroleum Prod-
2 recting for gage error and correcting to a standard barometric
ucts (Reid Method)
pressure, is reported as the LPG Vapor Pressure at the selected
D 1265 Practice for Sampling Liquefied Petroleum (LP)
2 test temperature.
Gases (Manual Method)
E 1 Specification for ASTM Thermometers
5. Significance and Use
2.2 Institute of Petroleum Standard:
4 5.1 Information on the vapor pressures of liquefied petro-
IP 181 Sampling Petroleum Gases
leum gas products under temperature conditions from 37.8 to
3. Terminology 70°C (100 to 158°F) is pertinent to selection of properly
designed storage vessels, shipping containers, and customer
3.1 Definitions:
utilization equipment to ensure safe handling of these products.
3.1.1 vapor pressure—the pressure exerted by the vapor of
5.2 Determination of the vapor pressure of liquefied petro-
a liquid when in equilibrium with the liquid.
leum gas is important for safety reasons to ensure that the
3.2 Definitions of Terms Specific to This Standard:
maximum operating design pressures of storage, handling, and
3.2.1 liquefied petroleum gases—narrow boiling range hy-
fuel systems will not be exceeded under normal operating
drocarbon mixtures consisting chiefly of propane or propylene,
temperature conditions.
or both, (Warning— Extremely flammable. Harmful when
5.3 For liquefied petroleum gases, vapor pressure is an
inhaled.) butanes and butylenes, or both, in which the content
indirect measure of the most extreme low temperature condi-
tions under which initial vaporization can be expected to occur.
This test method is under the jurisdiction of ASTM Committee D02 on
It can be considered a semi-quantitative measure of the amount
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
of the most volatile material present in the product.
D02.H on Liquefied Petroleum Gas.
Current edition approved April 15, 1995. Published June 1995. Originally
published as D 1267 – 53 T. Last previous edition D 1267 – 89. 6. Apparatus
Annual Book of ASTM Standards, Vol 05.01.
3 6.1 Vapor Pressure Apparatus, constructed as illustrated in
Annual Book of ASTM Standards, Vol 14.03.
Fig. A1.1, and the various items of auxiliary equipment, are
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England
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
D 1267
completely described in Annex A1. on the sample source, and disconnect the sampling line.
6.2 The air chamber of Test Method D 323, may be inter- Immediately close the straight-through valve between the two
changeable with the upper chamber of this method. Similarly, chambers and open the inlet valve, with the apparatus in an
the liquid chamber (two-opening type) of Test Method D 323 is upright position. Close the inlet valve as soon as no more liquid
interchangeable with the B, 20 % lower chamber A1.1.4 of this escapes, and immediately open the straight-through valve.
method. Because of this interchangeability, the apparatus
NOTE 1—Transfer of the sample is facilitated by chilling the apparatus
assembly of Test Method D 323 must pass, as a safety
with a portion of the material under test.
precaution, the hydrostatic test specified in A1.1.6 before using
9.3.1 When using the 33 ⁄3 % lower chamber (A1.1.3)
same in testing liquefied petroleum gas.
proceed to 9.4.
7. Sampling and Sample Handling
9.3.2 When using the 20 % lower chamber (Appendix
7.1 Samples shall be obtained and stored in accordance with A1.1.4), close the straight-through valve and again open the
Practice D 1265, or IP 181, Sampling Petroleum Gases, unless inlet to permit expulsion of the lower chamber contents. As
the test samples can be taken directly from the source of the soon as no more liquid escapes from the lower chamber, close
material to be tested. the inlet valve and immediately open the straight-through
7.2 Any method of coupling the vapor pressure apparatus to valve.
the sample source can be employed. Tubing, 6 to 7 mm ( ⁄4 in.)
9.3.3 The upper chamber, prior to this operation, is liquid
in diameter, of minimum length, of suitable-working pressure,
full at some temperature that is normally below the environ-
and made of material corrosion-resistant to the products being
mental temperature. Since any warming of the apparatus would
sampled, is satisfactory for this purpose. A flexible tubing
cause expansion of the liquid content of the upper chamber,
connection of a satisfactory type greatly facilitates the purging
leading to possible rupture of the chamber, it is necessary that
and sampling operations. The tubing should be a conducting
the procedural steps of providing free space in the apparatus be
material or constructed with a built-in ground connection to
completed promptly.
minimize the effect of static electricity.
9.4 Vapor Pressure Determination:
9.4.1 Invert the apparatus and shake it vigorously. Return
8. Preparation of Apparatus
the apparatus to its normal upright position and immerse it in
8.1 If the apparatus has been used for testing products other
the constant-temperature water bath maintained at the test
than the type of product to be tested, disassemble, clean
temperature (4.1). The apparatus including the bleeder valve
thoroughly, and purge the parts in a stream of dry air.
coupling, but not the pressure gage, must be immersed.
8.2 Assemble the apparatus with the inlet valve of the lower
Throughout the determination, the temperature of the water
chamber open, the straight-through valve between the two
bath shall be checked periodically by means of the bath
chambers open, the bleeder valve closed, and with the proper
thermometer.
range pressure gage attached.
9.4.1.1 At test temperatures of 50°C (122°F) or below,
maintain the bath at 60.1°C (0.2°F). At test temperatures
9. Procedure
above 50°C (122°F), up to and including 70°C (158°F),
9.1 Safe means for the disposal of vapors and liquids during
maintain the bath at 60.3°C (0.5°F).
this operation and in the subsequent sampling operation must
9.4.1.2 Observe the apparatus assembly throughout the test
be provided.
period to ensure freedom from leaks. Discontinue the test and
9.2 Purging—With the assembled apparatus in an upright
discard the results at any time a leak is detected.
position, connect the inlet valve of the lower chamber to the
9.4.2 After 5 min have elapsed, withdraw the apparatus
sample source with the sampling connection (7.2). Open the
from the water bath, invert it, shake it vigorously, and then
sample source valve to the apparatus. Cautiously open the
return it to the bath. Perform the shaking operation quickly to
bleeder valve on the upper chamber, permitting the air or
avoid excessive cooling of the apparatus and its contents.
vapors, or both, in the apparatus to escape until the apparatus
Thereafter, at intervals of not less than 2 min, withdraw the
is full of liquid. Close the lower chamber inlet valve and open
apparatus from the bath, invert, shake it vigorously, and then
the bleeder valve to its wide open position. Allow the contained
return it to the bath. Prior to each removal of the apparatus
liquid to evaporate until the apparatus is covered with white
from the water bath, tap the gage lightly and observe the
frost (may require more than one chilling), then invert the
pressure reading. These operations will normally require 20 to
assembly, and expel any residual material through the bleeder
30 min to ensure equilibrium. After this time, if consecutive
valve. Allow the residual vapors to escape until the pressure in
observed gage readings are constant, record the pressure
the apparatus is essentially atmospheric, then close the bleeder
reading as the Uncorrected LP-Gas Vapor Pressure of the
valve.
sample at the test temperature.
9.3 Sampling—Return the apparatus, now containing only
vapors, to its normal upright position and open the inlet valve. 9.4.3 Without removing the pressure gage from the appara-
As soon as the apparatus attains essentially the same pressure tus or the apparatus from the bath, attach a test gage, previously
as the pressure of the sample source, momentarily open the calibrated against a dead-weight tester, to the bleeder valve
bleeder valve. If liquid
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