1. Anticorrosion
(1) There are many kinds of anti-corrosion materials on the market now, and the good and the bad are mixed. In order to ensure the quality of the materials, it is emphasized that there must be product quality certification documents: the factory certificate, the test report of a qualified testing agency, etc.
(2) Prepared with reference to the current national "Code for Acceptance and Acceptance of Construction Quality of Building Water Supply, Drainage and Heating Engineering" GB 50242, the purpose is to unify the standards and practices of anti-corrosion engineering.
(3) It specifies what should be done when a variety of coatings are used together, in order to ensure that the chemical properties of the coatings meet the design and use requirements.
(4) The rust removal quality before the anticorrosion of the steel surface is specified, the purpose is to prevent the rust on the base surface from affecting the adhesion of the paint film, causing the paint film to fall off and causing pipeline corrosion.
(5) When the temperature is lower than 5 ℃, the viscosity of the paint will increase, and defects such as uneven thickness and difficult drying will occur during spraying, which will affect the anti-corrosion quality. This article stipulates the suitable conditions for coatings, and proposes technical measures for construction under unfavorable environmental conditions to ensure the quality of coatings and brushing. For special coatings, it should be carried out according to the instructions of the product.
(6) If the next process construction is carried out before the paint film is cured, it will often cause damage to the paint film and affect the integrity of the paint film. It is required that the damaged paint film should be repaired and accepted.
(7) The rooting part of the bracket is not coated with anti-corrosion.
(8) The steel pipe at the interface of the directly buried prefabricated thermal insulation pipeline is generally not coated with anti-corrosion.
(9) After repairing, the requirements to meet the quality standards should be checked and accepted.
(10) Requirements for coating and glass fiber to strengthen the anti-corrosion layer. Leave a blank section of 200mm~250mm at both ends to prevent the anti-corrosion layer from burning out during welding.
(11) Ensure that managers can easily identify their specifications and categories during operation and management.
(12) Specify the technical requirements and inspection standards for sacrificial anode anticorrosion, and sacrificial anode anticorrosion should be completed under the guidance of professional construction personnel.
(13) For the anti-corrosion inspection of the steel externally protected directly buried thermal insulation pipeline, the corresponding inspection method should be selected according to the anti-corrosion material.
2. Insulation
(1) There are many kinds of thermal insulation materials on the market now, and the good and bad are mixed. In order to ensure the quality of thermal insulation, it is emphasized that there must be quality certification documents: factory certificate, test report from a qualified testing agency, etc.
(2) If the construction unit requires on-site sampling inspection of prefabricated direct-buried thermal insulation pipes, samples should be taken when the pipe is broken on site. If the pipe is not broken during the construction process, the materials required for the inspection can be directly cut out, and the sampling place can be treated according to the on-site joint. Sampling inspection can refer to the provisions of the following table.