ASTM D3700-07
(Practice)Standard Practice for Obtaining LPG Samples Using a Floating Piston Cylinder
Standard Practice for Obtaining LPG Samples Using a Floating Piston Cylinder
SIGNIFICANCE AND USE
This practice allows the collection of a representative sample of LPG that may contain trace volatile components such as methane, nitrogen, and ethane. Sampling by Practice D 1265 may result in a small, but predictable loss of these lighter components. Practice D 1265 is suitable for collecting samples for routine specification testing, as the small loss of light components is not significant under Specification D 1835 specification requirements. Practice D 3700 is recommended whenever highly accurate determination of light components is required. For example, composition determined on samples collected according to Practice D 3700 may be used to establish product value of NGL mixtures (see Appendix X1).
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 given in parentheses are for information only.
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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D3700 − 07
StandardPractice for
1
Obtaining LPG Samples Using a Floating Piston Cylinder
This standard is issued under the fixed designation D3700; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* D1835 Specification for Liquefied Petroleum (LP) Gases
3
2.2 GPA Standards:
1.1 This practice covers the equipment and procedures for
GPA 2174 Obtaining Liquid Hydrocarbon Samples for
obtaining a representative sample of specification liquefied
Analysis by Gas Chromatography
petroleumgas(LPG),suchasspecifiedinSpecificationD1835,
GPA 2140 Liquefied Petroleum Gas Specifications and Test
GPA2140, and comparable international standards. It may also
Methods
be used for other natural gas liquid (NGL) products that are
normally single phase (NGL mix, field butane, and so forth),
3. Terminology
defined in other industry specifications or contractual agree-
3.1 Definitions:
ments.
3.1.1 floating piston cylinder (FPC)—a high pressure
1.2 This practice is not intended for non-specification prod-
sample container, with a free floating internal piston that
ucts that contain significant quantities of undissolved gases
effectively divides the container into two separate compart-
(N ,CO ), free water or other separated phases, such as raw or
2 2
ments.
unprocessed gas/liquids mixtures and related materials. The
3.1.2 maximum fill density (reduced fill density)—the vol-
same equipment can be used for these purposes, but additional
ume of a container occupied by the sample, usually expressed
precautions are generally needed to obtain representative
as a percentage of the total capacity.
samples of multi-phase products (see Appendix X1).
1.3 This practice includes recommendations for the location
4. Summary of Practice
of a sample point in a line or vessel. It is the responsibility of
4.1 Aliquid LPG sample is transferred under pressure from
the user to ensure that the sampling point is located so as to
a sample point to a floating piston cylinder. The floating piston
obtain a representative sample.
cylinder (FPC) is designed to collect liquid samples with no
1.4 The values stated in SI units are to be regarded as
vaporization by displacing a piston against a pressurizing fluid
standard. The values given in parentheses are for information
(usually an inert gas). The piston serves as a physical barrier
only.
between the sample and the pressurizing fluid, at the sampling
pressure. The position of the piston at the end of sampling
1.5 This standard does not purport to address all of the
indicates the percent fill of the sample cylinder.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.2 It is the responsibility of the user of this practice to
priate safety and health practices, and determine the applica-
locate the sample point at a suitable location where the product
bility of regulatory limitations prior to use.
being sampled is a representative, single phase, homogeneous
liquid.
2. Referenced Documents
2
5. Significance and Use
2.1 ASTM Standards:
D1265 Practice for Sampling Liquefied Petroleum (LP)
5.1 This practice allows the collection of a representative
Gases, Manual Method
sample of LPG that may contain trace volatile components
such as methane, nitrogen, and ethane. Sampling by Practice
D1265 may result in a small, but predictable loss of these
1
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum
lighter components. Practice D1265 is suitable for collecting
Products and Lubricantsand is the direct responsibility of Subcommittee D02.H0 on
Liquefied Petroleum Gas.
samples for routine specification testing, as the small loss of
Current edition approved Feb. 15, 2007. Published March 2007. Originally
light components is not significant under Specification D1835
approved in 1978. Last previous edition approved in 2001 as D3700–01. DOI:
specification requirements. Practice D3700 is recommended
10.1520/D3700-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from Gas ProcessorsAssociation (GPA), 6526 E. 60th St., Tulsa, OK
the ASTM website. 74145.
*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 States
1
---------------------- Page: 1 ----------------------
D3700 − 07
data, or both, to determine the maximum fill for
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.