Significance and Use

A knowledge of water extractable inorganic halides in oil is important when deciding whether or not the oils need desalting. Excessive halide, especially in crude oil, frequently results in higher corrosion rates in refining units.

1. Scope

1.1 This test method covers the determination of salt in crude oils. For the purpose of this test method, salt is expressed as % (m/m) NaCl (sodium chloride) and covers the range from 0.0005 to 0.15 % (m/m).

1.2 The limit of detection is 0.0002 % (m/m) for salt (as NaCl).

1.3 The test method is applicable to nearly all of the heavier petroleum products, such as crude oils, residues, and fuel oils. It may also be applied to used turbine oil and marine diesel fuel to estimate seawater contamination. Water extractable salts, originating from additives present in oils, are codetermined.

1.4 The values stated in SI units are to be regarded as the standard.

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.

ASTM Standards

D329 Specification for Acetone

D770 Specification for Isopropyl Alcohol

D843 Specification for Nitration Grade Xylene

D1193 Specification for Reagent Water

D4006 Test Method for Water in Crude Oil by Distillation

D4057 Practice for Manual Sampling of Petroleum and Petroleum Products

D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products

D4377 Test Method for Water in Crude Oils by Potentiometric Karl Fischer Titration

D4928 Test Method for Water in Crude Oils by Coulometric Karl Fischer Titration

E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis

Keywords

crude oil; extraction; potentiometric; salt; Crude petroleum products; Fuel oils; Gas turbine fuel oils; Homogenization efficiency of unknown mixers; Marine fuels; Petroleum oils; Potentiometric method; Salts; Seawater contamination;

ICS Code

ICS Number Code 75.180.30 (Volumetric equipment and measurements)

DOI: 10.1520/D6470-99R10

ASTM International is a member of CrossRef.

ASTM D6470