ASTM D2158 Standard Test Method for Residues in Liquefied Petroleum (LP) Gases
1. Scope
1.1 This test method covers the determination of extraneous materials weathering above 38°C that are present in liquefied petroleum gases. The extraneous materials will generally be dissolved in the LPG, but may have phase-separated in some instances.
1.2 Liquefied petroleum gases that contain certain anti-icing additives can give erroneous results by this test method.
1.3 Although this test method has been used to verify cleanliness and lack of heavy contaminants in propane for many years, it might not be sensitive enough to protect some equipment from operational problems or increased maintenance. A more sensitive test, able to detect lower levels of dissolved contaminants, could be required for some applications.
1.4 WARNING - Mercury has been designated by many regulatory agencies as a hazardous material that can cause central nervous system, kidney and liver damage. Mercury, or its vapor, may be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Material Safety Data Sheet (MSDS) for details and EPA's additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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
2.1 ASTM Standards:
D96 Test Method For Water and Sediment in Crude Oil by Centrifuge Method Field Procedure
D1796 Test Method for Water and Sediment in Fuel Oils by the Centrifuge Method (Laboratory Procedure)
D1835 Specification for Liquefied Petroleum (LP) Gases
E1 Specification for ASTM Liquid-in-Glass Thermometers
2.2 Energy Institute Document:
IP Test Methods - Appendix A. Specifications - IP standard thermometers
3. Terminology
3.1 Definitions ofTerms Specific to This Standard:
3.1.1 oil stain observation, n - the volume of solvent-residue mixture required to yield an oil stain or ring that persists for 2 minutes under specified conditions on absorbent paper.
3.1.2 residue, n - the volume, measured to the nearest 0.05 mL, of the residual material boiling above 38°C resulting from the evaporation of 100 mL of sample under the specified conditions of this test method.
3.1.3 solvent-residue mixture, n - a mixture (solution) of 10 mL of solvent with any residue remaining in the centrifuge tube at the conclusion of the first step in this test method.
