Standard: NACE 10D199

COATINGS FOR THE REPAIR AND REHABILITATION OF THE EXTERNAL COATINGS OF BURIED STEEL PIPELINES

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Scope:

Introduction

Coating selection for repair and rehabilitation of existing coatings on buried steel pipelines is determined by specific criteria relating to the project to be executed. In some cases, the factors limiting coating selection are similar to those considered during new pipeline construction activities. However, when a pipeline is recoated, there are additional factors that are considered, such as field application criteria and achievable production rates during limited operating hours. Coating repair/rehabilitation can be performed in, over, or beside a ditch, whether the pipeline is in service, out of service, or segmented.

Pipeline recoating usually falls into one of two categories: repair coating or rehabilitation coating. Repair coatings are utilized during bell-hole operations for common pipeline maintenance, operation, or repair work. Examples of typical operations are coating of thermite welds, fittings, patching of coating holidays, overcoating of steel or composite pipeline repairs/reinforcements, and recoating of replacement piping or tie-in welds. Rehabilitation coatings are utilized for planned recoating operations as part of a minor or major rehabilitation project. Repair and rehabilitation coatings can be of the same coating material.

The requirements of all applicable government and environmental regulations are included in the planning stages of a recoating project. Such regulations relate to all components of a recoating project, including permitting requirements, soil erosion controls, groundwater protection, coating removal and disposal (especially if asbestos, dioxin, lead, or any other hazardous/regulated substance is present), surface preparation, dust control, abrasive disposal, volatile organic compounds (VOCs), hazardous air pollutants (HAP), and coating application. In addition, the steel substrate is evaluated prior to the coating operation to ensure that the pipeline can be safely coated.

The coating selection itself is usually based on both laboratory and field-performance testing. Laboratory testing using accelerated test conditions can give a good indication of the expected life of a coating material. However, field testing can provide the best indication of coating performance.

Organization: NACE International
Document Number: nace 10d199
Publish Date: 1999-01-01
Page Count: 8
Available Languages: EN
DOD Adopted: NO
ANSI Approved: NO
Most Recent Revision: YES
Current Version: NO
Status: Inactive

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