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Significance and Use
5.1 This practice allows the collection of a representative sample of LPG that may contain trace volatile dissolved components such as methane, ethane, and nitrogen. Sampling by Practice can result in a small, but predictable, loss of these lighter components. Practice is suitable for collecting samples for routine specification testing, as the small loss of light components is not significant under Specification specification requirements. Practice is recommended whenever highly accurate determination of light components is required. For example, compositions determined on samples collected according to Practice may be used to establish the product value of NGL mixtures (see ).
1.1 This practice covers the equipment and procedures for obtaining a representative sample of liquefied petroleum gas (LPG), such as specified in ASTM Specification , GPA 2140, and comparable international standards. It may also be used for other natural gas liquid (NGL) products that are normally single phase (for example, NGL mix, field butane, and so forth), defined in other industry specifications or contractual agreements, and for volatile (higher vapor pressure) crude oils.
Note 1: Some floating piston cylinders have such tight piston seals that the vapor pressure of some high vapor pressure crude oils may not be sufficient to allow sampling without a handle to move the piston. An alternative sampling practice for UN Class 3 liquids (under 300 kPa at 52 °C) is Practice , which utilizes a Manual Piston Cylinder (MPC) sampler.
1.2 This practice is not intended for non-specification products that contain significant quantities of undissolved gases (N2, 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 ).
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 standard.
1.4.1 Exception—The values given 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1265 Practice for Sampling Liquefied Petroleum (LP) Gases, Manual Method
D1835 Specification for Liquefied Petroleum (LP) Gases
GPA Midstream Association StandardsGPA 2140 Liquefied Petroleum Gas Specifications and Test Methods GPA 2174 Obtaining Liquid Hydrocarbon Samples for Analysis by Gas Chromatography
ICS Number Code 75.120 (Hydraulic fluids)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D3700-16, Standard Practice for Obtaining LPG Samples Using a Floating Piston Cylinder, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top