ASTM G18-07(2013)
Standard Test Method for Joints, Fittings, and Patches in Coated Pipelines

Standard No.

ASTM G18-07(2013)

Release Date

2007

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM G18-07(2020)

Latest

ASTM G18-07(2020)

Scope

4.1 The exposed metal surfaces at joints, fittings, and damaged areas in an otherwise coated pipeline will be subjected to corrosion if allowed to come in contact with the soil environment. The performance of joint and patching materials designed to function as protective coverings will depend upon such factors as the ability of the material to bond to both the pipe coating and exposed metal surfaces, the integrity of the moisture seal at lapped joints, and the water absorption characteristics of the joint material.

4.2 The existence of substantial leakage current through the coating joint, patch, or fitting is reliable evidence that the material has suffered a significant decrease in its performance as a protective barrier. In a similar manner, measured changes in joint capacitance and dissipation factor are useful because they are related to the water absorption rate of the joint material. Water permeating an insulating barrier increases its capacitance and its progress can be measured through the use of a suitable impedance bridge.

1.1 This test method describes determination of the comparative corrosion preventative characteristics of materials used for applications to joints, couplings, irregular fittings, and patched areas in coated pipelines. The test method is applicable to materials whose principal function is to act as barriers between the pipe surface and surrounding soil environment.

1.2 The test method described employs measurements of leakage current, capacitance, and dissipation factor to indicate changes in the insulating effectiveness of joint and patching materials.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 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.

1.5 The values stated in SI units to three significant decimals are to be regarded as the standard. The values given in parentheses are for information only.

ASTM G18-07(2013) Referenced Document

• ASTM G12 Standard Test Method for Nondestructive Measurement of Film Thickness of Pipeline Coatings on Steel

ASTM G18-07(2013) history

• 2020 ASTM G18-07(2020) Standard Test Method for Joints, Fittings, and Patches in Coated Pipelines
• 2007 ASTM G18-07(2013) Standard Test Method for Joints, Fittings, and Patches in Coated Pipelines
• 2007 ASTM G18-07 Standard Test Method for Joints, Fittings, and Patches in Coated Pipelines
• 1988 ASTM G18-88(1998) Standard Test Method for Joints, Fittings, and Patches in Coated Pipelines