ASTM D3700-01
(Practice)Standard Practice for Obtaining LPG Samples Using a Floating Piston Cylinder
Standard Practice for Obtaining LPG Samples Using a Floating Piston Cylinder
SCOPE
1.1 This practice covers the equipment and procedures for obtaining a representative sample of specification liquefied petroleum gas (LPG), such as specified in Specification D 1835, GPA 2140, and comparable international standards. It may also be used for other natural gas liquid (NGL) products that are normally single phase (NGL mix, field butane, and so forth), defined in other industry specifications or contractual agreements.
1.2 This practice is not intended for non-specification products that contain significant quantities of undissolved gases (N 2, CO2), free water or other separated phases, such as raw or unprocessed gas/liquids mixtures and related materials. The same equipment can be used for these purposes, but additional precautions are generally needed to obtain representative samples of multi-phase products (see Appendix X1).
1.3 This practice includes recommendations for the location of a sample point in a line or vessel. It is the responsibility of the user to ensure that the sampling point is located so as to obtain a representative sample.
1.4 The values stated in SI units are to be regarded as the standard. The values provided in parentheses are for information only.
1.5 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.
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An American National Standard
Designation: D 3700 – 01
Standard Practice for
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Obtaining LPG Samples Using a Floating Piston Cylinder
This standard is issued under the fixed designation D 3700; 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 Analysis by Gas Chromatography
GPA2140 Liquefied Petroleum Gas Specifications and Test
1.1 This practice covers the equipment and procedures for
Methods
obtaining a representative sample of specification liquefied
petroleum gas (LPG), such as specified in Specification
3. Terminology
D 1835, GPA 2140, and comparable international standards. It
3.1 floating piston cylinder (FPC)—a high pressure sample
may also be used for other natural gas liquid (NGL) products
container, with a free floating internal piston that effectively
that are normally single phase (NGL mix, field butane, and so
divides the container into two separate compartments.
forth), defined in other industry specifications or contractual
3.2 maximum fill density (reduced fill density)—the volume
agreements.
of a container occupied by the sample, usually expressed as a
1.2 This practice is not intended for non-specification prod-
percentage of the total capacity.
ucts that contain significant quantities of undissolved gases
(N ,CO ), free water or other separated phases, such as raw or
2 2
4. Summary of Practice
unprocessed gas/liquids mixtures and related materials. The
4.1 Aliquid LPG sample is transferred under pressure from
same equipment can be used for these purposes, but additional
a sample point to a floating piston cylinder. The floating piston
precautions are generally needed to obtain representative
cylinder (FPC) is designed to collect liquid samples with no
samples of multi-phase products (see Appendix X1).
vaporization by displacing a piston against a pressurizing fluid
1.3 This practice includes recommendations for the location
(usually an inert gas). The piston serves as a physical barrier
of a sample point in a line or vessel. It is the responsibility of
between the sample and the pressurizing fluid, at the sampling
the user to ensure that the sampling point is located so as to
pressure. The position of the piston at the end of sampling
obtain a representative sample.
indicates the percent fill of the sample cylinder.
1.4 The values stated in SI units are to be regarded as the
4.2 It is the responsibility of the user of this practice to
standard. The values provided in parentheses are for informa-
locate the sample point at a suitable location where the product
tion only.
being sampled is a representative, single phase, homogeneous
1.5 This standard does not purport to address all of the
liquid.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety and health practices, and determine the applica-
5.1 This practice allows the collection of a representative
bility of regulatory limitations prior to use.
sample of LPG that may contain trace volatile components
such as methane, nitrogen, and ethane. Sampling by Practice
2. Referenced Documents
D 1265 may result in a small, but predictable loss of these
2.1 ASTM Standards:
lighter components. Practice D 1265 is suitable for collecting
D 1265 Practice for Sampling Liquefied Petroleum (LP)
2 samples for routine specification testing, as the small loss of
Gases (Manual Method)
2 light components is not significant under Specification D 1835
D 1835 Specification for Liquefied Petroleum (LP) Gases
3 specification requirements. Practice D 3700 is recommended
2.2 GPA Standards:
whenever highly accurate determination of light components is
GPA 2174 Obtaining Liquid Hydrocarbon Samples for
required. For example, composition determined on samples
collected according to Practice D 3700 may be used to estab-
1 lish product value of NGL mixtures (see Appendix X1).
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
Products and Lubricants and is the direct responsibility of Subcommittee D02.H on
6. Interferences
Liquefied Petroleum Gases.
Current edition approved Dec. 10, 2001. Published February 2002. Originally
6.1 An interference in a sampling procedure is anything
published as D 3700 – 78. Last previous edition D 3700 – 94.
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which compromises the integrity of the sample.
Annual Book of ASTM Standards, Vol 05.01.
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Available from Gas Processors Assoc., 6526 E. 60th Street, Tulsa, OK 74145.
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