Pipeline anti corrosion specifications, buried pipeline anti corrosion specifications

1. Scope: This process standard is applicable to the anti-corrosion engineering of indoor and outdoor pipelines, equipment and containers. 2. Construction preparation Material requirements: Anti-rust paint, topcoat, asphalt, etc. should have factory certificate.

Thinners: gasoline, kerosene, alkyd thinners, pine perfume, alcohol, etc. Other Materials:

Kaolin, grade 7 asbestos, limestone powder or talcum powder, glass silk cloth, mineral wool paper, linoleum, kraft paper, plastic sheeting, etc. Main Tools: Tools:

Spray guns, air compressors, gold steel grinding wheels, rust removers, etc. Tools: scrapers, files, wire brushes, abrasive cloths, sandpaper, brushes, cotton wires, asphalt pots, etc.

Working conditions: There are stacked pipes, equipment, containers and places for anti-corrosion operations. The temperature of the construction environment is above 5, and the ventilation is good, and there is no soot, dust and fire vapor.

Winter construction measures should be taken for construction when the temperature is below 5.

At 100 mm, the joints are bonded with hot asphalt mat-rein or cold base oil. Kraft paper can also be replaced with PVC plastic cloth or glass mesh tape without cold base oil. When making an extra-strong anti-corrosion layer, the winding direction of the two waterproofing membranes should be opposite.

When lifting the pipe that has been made of anti-corrosion layer, a soft sling or a rope that does not damage the anti-corrosion layer should be used to avoid damaging the anti-corrosion layer. Before the pipe goes down the ditch, the pipe ditch should be cleaned so that the bottom of the ditch is flat and free of stones, bricks or other sundries. If the upper layer is very hard, 100mm of soft fine soil should be laid at the bottom of the ditch first, and after the pipe is in the ditch, it is not allowed to move the pipe with a crowbar, and it is not allowed to directly push the pipe into the ditch.

All defects of anticorrosive layer soil, unqualified places and damaged parts during inspection and ditching, should be repaired before backfilling the pipe ditch, backfilling, it is advisable to manually backfill a layer of fine soil, bury the top of the pipe, and then use manual or mechanical backfilling. 4 Quality standards Basic items: The anti-corrosion layer of buried pipelines shall comply with the following provisions:

The materials and structure meet the design requirements and construction specifications. The coil is firmly pasted with the pipeline and each layer of the coil, the surface is smooth, and there are no defects such as wrinkles, hollowing, slippage and poor sealing. Test Method:

Observe or cut open the antiseptic layer for inspection. The painting of pipes, boxes and metal supports shall comply with the following regulations: The type of paint and the number of brushing passes meet the design requirements, the adhesion is good, there is no peeling, blistering and leakage, the thickness of the paint film is uniform, the color is consistent, and there is no falling and pollution.

Test Method: Observation and Inspection. 5 Finished product protection The pipes and equipment that have been prepared for the anti-corrosion layer should be separated from each other and should not be adhered to, so as not to damage the anti-corrosion layer.

Clean up the surrounding environment before brushing the oil to prevent dust from flying, keep it clean, and do not work in the open air in case of strong winds, rain, fog and snow. For painted pipes, equipment and containers, the paint layer should be protected from freezing, impact and shock during the drying process.

1. Installation of smoke exhaust pipes and accessories.

1. The smoke exhaust pipe should be made of steel pipe or cast iron pipe. When welding steel pipes are used, their wall thickness should be greater than 3mm; When the pipe connection is welded, when the flange connection is used, the flange surface should be flat and there should be a sealing groove; Heat-resistant rubber pads should be lined between the flanges.

2. The cast iron smoke exhaust pipe buried in the concrete should be connected by flange.

3. The smoke exhaust pipe should be equipped with a thermal expansion compensator along the axis, the one-way casing expansion joint should be the same as the front and rear smoke exhaust pipes, and the connecting section of the diesel engine smoke exhaust pipe and the smoke exhaust main pipe should have buffer facilities.

4. The installation of smoke exhaust pipes shall comply with the following provisions:

1) The slope should be greater than that, and the drain valve should be located in the most place;

2) The cleaning hole plugging plate should have a heat-resistant cushion and be fixed tightly;

3) When the smoke exhaust pipe passes through the partition wall, the surrounding void should be filled with asbestos rope;

4) At the connection between the smoke exhaust pipe and the exhaust flue, a closed wall short pipe with a flange and a closed wing ring should be pre-embedded.

5. The ground outlet end of the smoke exhaust pipe should be equipped with a rainproof cap; At a distance of 150-200mm above the ground, measures should be taken to prevent the smoke exhaust pipe from clogging.

2. Pipeline anti-corrosion painting.

1. The parts that are not easy to paint after the installation of the pipeline should be painted in advance.

2. Before painting, the surface should be removed from rust, welding slag, burrs, oil, water and other dirt.

3. There must be corresponding fire prevention measures for painting construction.

4. Non-ferrous metal pipes, stainless steel pipes, galvanized steel pipes, galvanized iron sheets and aluminum protective layers can not be painted, but joints and damaged parts should be painted.

5. The buried pipeline or the pipeline in the trench should be coated with two anti-rust paints first, and then two asphalt paints; The pipes that are laid in the project should be coated with anti-rust paint twice and then topcoat twice.

6. Buried cast iron pipes should be coated with two asphalt paints and then one topcoat; The cast iron pipe in the project should be coated with two coats of anti-rust paint and then one topcoat.

7. The coating quality shall comply with the following regulations:

1) The coating should be uniform and the color should be consistent;

2) The coating film should be firmly adhered to without defects such as peeling, wrinkles, bubbles, pinholes, etc.;

The coating should be intact, free of damage and flow.

Legal analysis: In order to ensure the quality of the anti-corrosion and insulation layer of buried steel pipelines, prolong the service life and improve the economic benefits, this standard is formulated. This standard is applicable to the design, prefabrication and construction acceptance of the anti-corrosion layer and insulation layer of the outer wall of the buried steel pipeline with a temperature of no more than 120.

In addition to this standard, the anti-corrosion insulation layer of buried steel pipeline should comply with the provisions of the current national standards in addition to this standard.

Legal basis: Article 1 of the Technical Standard for Anti-corrosion and Insulation of Buried Steel Pipelines This standard is formulated in order to ensure the quality of the anti-corrosion and insulation layer of buried steel pipelines, prolong the service life and improve economic benefits. This standard is applicable to the design, prefabrication and construction acceptance of the anti-corrosion layer and insulation layer of the outer wall of the buried steel pipeline with a temperature of no more than 120.

In addition to this standard, the anti-corrosion insulation layer of buried steel pipeline should comply with the provisions of the current national standards in addition to this standard.

Summary. Pipeline anti-corrosion part of the industry standard specification.

1) "Standard for Electrical Insulation of Cathodic Protection Pipes" SY T0086-2003;

2) "Technical Standard for Bonded Epoxy Powder Coating of Steel Pipes" SY T0315-97;

3) "Technical Standard for Polyethylene Anticorrosive Layer of Buried Steel Pipelines" SY T0413-2002;

4) Code for Design of Corrosion Control Engineering for Steel Pipelines and Storage Tanks SY0007-1999;

5) "Design Code for Forced Current Cathodic Protection of Buried Steel Pipelines" SY T0036-2000;

6) "Design Code for Cathodic Protection of Sacrificial Anode of Buried Steel Pipelines" SY T0019-97;

7) Test Method for Cathodic Protection Parameters of Buried Steel Pipelines (SY T0023-97);

8) "Technical Standard for DC Drainage Protection of Buried Steel Pipelines" SY T0017-96.

National standard for anti-corrosion of natural gas pipelines.

Industry standard specification for pipeline anti-corrosion: 1) "Standard for Electrical Insulation of Cathodic Protection Pipelines" SY T0086-2003; 2) "Technical Standard for Bonded Epoxy Powder Coating of Steel Pipes" SY T0315-97; 3) "Technical Standard for Polyethylene Anticorrosive Layer of Buried Steel Pipelines" SY T0413-2002; 4) Code for Design of Corrosion Control Engineering for Steel Pipelines and Storage Tanks SY0007-1999; 5) "Design Code for Forced Current Cathodic Protection of Buried Steel Pipelines" SY T0036-2000; 6) "Design Code for Cathodic Protection of Sacrificial Anode of Buried Steel Pipelines" SY T0019-97; 7) Test Method for Cathodic Protection Parameters of Buried Steel Pipelines (SY T0023-97); 8) "Technical Standard for DC Drainage Protection of Buried Steel Pipelines" SY T0017-96.

What is the anti-corrosion standard for gas medium pressure pipelines?

1. GB T23257-2009 "Technical Specification for Anti-corrosion of Gas Industry Pipeline System": This standard stipulates the anti-corrosion requirements of gas pipeline system, including the selection of anti-corrosion materials, the quality requirements of the coating layer, and the construction method.

2. GB T9711-2011 "Technical Conditions for Conveying Steel Pipes in the Oil and Gas Industry": This standard is applicable to steel pipes for transporting liquid gas, and stipulates the manufacturing requirements, chemical composition, mechanical properties, welding properties, and anti-corrosion measures of steel pipes.

3. SY T6276-2012 "Technical Regulations for Anti-corrosion in the Oil and Gas Industry": This standard mainly regulates the anti-corrosion technology of the oil and gas industry, including the selection of anti-corrosion materials, the construction and inspection requirements of anti-corrosion coatings, etc.

4. CJ T114-2000 "Code for Design of Gas Engineering": This standard is a specification for the design requirements of gas engineering, including the selection of gas pipelines, the placement of gas pipelines, and anti-corrosion measures.

The main technical measures of gas pipeline Biyou anti-corrosion:

1. Material selection: according to the characteristics of the medium and the use environment, choose pipes and anti-corrosion coatings with good corrosion resistance, such as FRP pipes, plastic pipes, etc. At the same time, the quality inspection of the pipe is also required to ensure that it meets the requirements of the standard.

2. Anti-corrosion coating: The surface of the gas pipeline needs to be coated with a layer of anti-corrosion coating to prevent corrosion and gas leakage. Commonly used anticorrosive coatings include epoxy resin, polyurethane, etc., which can provide good anti-corrosion protection.

3. Anti-corrosion treatment: In the parts that are susceptible to corrosion such as pipeline connections and elbows, anti-corrosion treatment is required, such as coating anti-corrosion paste and installing anti-corrosion casing, etc., to improve its corrosion resistance.

4. Detection and monitoring: Regularly inspect the gas pipeline, find problems and repair them in time to ensure the integrity and safe operation of the pipeline. Commonly used testing methods include ultrasonic testing, magnetic particle testing, etc.

5. Maintenance: Regularly maintain the gas pipeline, such as cleaning the debris inside the pipeline, checking the condition of the anti-corrosion coating, etc., to ensure the normal operation and anti-corrosion effect of the pipeline. <>

Steel pipes are very prone to corrosion during use, so internal and external anti-corrosion technology has become an important means to ensure the quality of pipelines and prolong their service life. First of all, internal anti-corrosion requires the use of non-toxic, odorless, acid-alkali resistant, non-igniting coating materials, such as epoxy resin quick-drying coating or polypropylene anti-corrosion coating, to protect the poor rubber pigging wall from the erosion of medium substances. Secondly, external anti-corrosion needs to be sprayed with coatings with good weather resistance, ultraviolet radiation resistance and chemical corrosion resistance to prevent being affected by various climatic factors in the environment and affecting the service life of the pipeline.

In addition, the internal and external anti-corrosion technology of steel pipelines is also closely related to the construction quality. During the construction process, it is necessary to ensure the cleanliness of the construction site in advance, and at the same time clean and polish the surface of the pipeline to make its surface smooth. When coating, appropriate paint coating methods should be adopted according to the requirements of different pipelines, and various construction parameters should be strictly controlled to achieve the best effect.

At the same time, after the coating is completed, the curing time and environment should be strictly controlled to ensure the integrity and durability of the coating.

To sum up, the implementation of internal and external anti-corrosion technology for steel pipelines requires scientific selection of coating materials and strict construction quality control. Only under the strict construction management and perfect coating technology can the quality and service life of the pipeline be effectively guaranteed, and a good foundation can be laid for the smooth operation of the project.