GB/T 50726-2023Technical standard for anti-corrosion engineering of industrial equipment and pipeline (English PDF)

1.0.1

This standard is formulated to improve the technical level of anti-corrosion engineering design and construction of industrial equipment and pipeline, strengthen the quality control of anti-corrosion engineering, strengthen acceptance, ensure the engineering quality, and achieve advanced technology, safety, applicability, and economic rationality.

1.0.2

This standard is applicable to the engineering design, construction, inspection, acceptance, operation and maintenance of anti-corrosion lining and exterior surface coating for new, renovated, and extended steel and cast iron based industrial equipment and pipeline.

1.0.3

This standard is not applicable to the following industrial equipment and pipeline:

1 equipment and pipeline directly heated by flame;

2 equipment and pipeline affected by nuclear radiation;

3 equipment and pipeline that frequently move, rotate or vibrate violently;

4 glass-lined equipment and pipeline;

5 equipment with metal lining and hot jacket lining other than lead lining and metal thermal-sprayed coatings of metal.

1.0.4

In addition to this standard, the engineering design, construction, inspection, acceptance, operation, and maintenance of anti-corrosion linings and exterior surface coatings for industrial equipment and pipeline shall also comply with the current relevant national standards.

2.0.1 fiber reinforced plastics lining

protective layer laid or sprayed on the inner surface of equipment and pipeline using thermosetting resin as a binder and fiber and its fabric as reinforcing material

2.0.2 coating lining

coating used for protecting the inner surface of industrial equipment and pipeline from corrosion by chemical media such as acid, alkali, salt, and solvent

2.0.3 liquid coating lining

liquid coating composed of corrosion-resistant resins, pigments, fillers, and additives, formed on the inner surface of industrial equipment and pipeline by spraying, roller coating or brush coating processes

2.0.4 powder coating lining

thermosetting or thermoplastic powder coating composed of solid resins, pigments, fillers, and additives, formed on the inner surface of industrial equipment and pipeline by powder electrostatic spraying process

2.0.5 spray polyurea lining

protective layer formed by rapid mixing and reaction of isocyanate prepolymers with amine-terminated polyethers, amine chain extenders, and other compounds through specialized two-component spraying equipment, sprayed on the inner surface of equipment and pipeline

2.0.6 chloroprene latex lining

protective layer composed of chloroprene latex, Portland cement, fiberglass mesh, and fine aggregate, applied to the inner surface of equipment and pipeline

2.0.7 chloroprene latex cement paste

viscous slurry formed by mixing chloroprene latex with Portland cement in a certain proportion

2.0.8 wire flame spraying

continuously transport linear metal materials to the spray gun, heat them to a molten state by the oxygen-gas flame, and then spray them onto the surface of the pre-treated equipment and pipeline with the help of compressed air or other atomizing gases

2.0.9 arc spraying

use the arc generated between two metal wires to melt the top of the wire, atomize by one or more gas jets and spray the melted metal droplets onto the surface of the pre-treated equipment and pipeline

3.1 General requirements

3.1.1

Anti-corrosion engineering operators of industrial equipment and pipeline shall have relevant professional work certificates or have accepted professional training and passed the examination.

3.1.2

All relevant units participating in anti-corrosion engineering of industrial equipment and pipeline shall establish corresponding management systems in accordance with relevant regulations and requirements, and formulate corresponding management system.

3.1.3

The lining and exterior surface coating for anti-corrosion engineering of industrial equipment and pipeline may be classified in the following forms:

1 fiber reinforced plastics lining;

2 rubber lining;

3 lead lining;

4 coating lining;

5 thermoplastic lining;

6 glass flake compound lining;

7 spray polyurea lining;

8 chloroprene latex lining;

9 brick lining;

10 thermal-sprayed coatings of metal;

11 coating protection of equipment and pipeline exterior surface.

3.1.4

The anti-corrosion lining and exterior surface coating of industrial equipment and pipeline shall be designed based on the type of medium, service conditions, service life, etc.

3.1.5

The materials used for the construction of anti-corrosion lining and exterior surface coating of industrial equipment and pipeline shall be provided with documentation of product quality, and their quality shall not be inferior to those specified in the current national standards.

3.1.6

The documentation of product quality shall include product quality certificate and material test report.

3.1.7

The materials used for the construction of anti-corrosion lining and exterior surface coating of industrial equipment and pipeline shall be accompanied with construction guidelines. When the materials used need to be prepared on site, the construction mix ratio shall be determined through testing based on the construction environment temperature, relative humidity, raw material performance, and construction process characteristics. The mix ratio determined by tests shall not be arbitrarily changed.

3.1.8

Measuring instruments, testing instruments and equipment shall undergo metrological verification and calibration, and shall be within their validity period.

3.1.9

The processing, gas cutting, welding, heat treatment, weld inspection, leakage test, and pressure test of industrial equipment and pipeline to be subjected to anti-corrosion construction shall be completed before lining construction.

3.1.10

The construction of anti-corrosion lining and exterior surface coating can only be carried out after the industrial equipment and pipeline that have been manufactured have passed the acceptance and completed the process handover procedures.

3.1.11

The engineering quality acceptance of anti-corrosion lining and exterior surface coating of industrial equipment and pipeline may be divided into inspection lots, subitem works, sub-section works or sub-subsection works, and the division shall comply with the relevant provisions of the current national standard GB/T 50252 Unified standard for constructional quality acceptance of industrial installation engineering.

3.1.12

The organization procedures and qualification standards for the construction acceptance of anti-corrosion lining and exterior surface coating of industrial equipment and pipeline shall comply with the relevant provisions of the current national standard GB/T 50252 Unified standard for constructional quality acceptance of industrial installation engineering.

3.1.13

The inspection items shall be inspected according to the dominant items and general items, and destructive inspection may be carried out.