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Important points for winding anticorrosive tape in winter pipelines

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Important points for winding anticorrosive tape in winter pipelines

Release date:2017-08-08 Author: Click:

一分彩Important points for winding anticorrosive tape in winter pipelines

一分彩Cold-wrapped anticorrosive tape is mainly used for anti-corrosion winding during construction. It is also a kind of tape with good anti-corrosion effect. Now it is almost winter, so let ’s take a look at the winter construction of cold-wrapped anticorrosive tape Right.

     First, because the temperature in winter is relatively low, when the cold-wound tape is wrapped, the tape will inevitably harden and there will be a certain amount of shrinkage. Therefore, we recommend that you do not use too wide tape.

一分彩     2. During the construction, before winding the tape, we need to apply the primer first. Generally, it can be wrapped about ten minutes after the primer is applied, but in winter, we must strictly follow the construction standards.

     Third, there will be more wind and sand in winter. At this time, there will be dust and other dust on the pipe. If there is no reliable protection measures, do not wind the cold-wrapped anticorrosive adhesive tape.

Yan'an Yan'an Comprehensive Utilization Project of Coal, Oil and Gas Resources Pipeline Anticorrosive Tape

Preparation for construction Surface derusting Repairing damage and welds Handing over acceptance Polyethylene anticorrosive tape Construction

一分彩1 Prepared in accordance with the design and construction drawings "Technical Standards for the Anticorrosive Coating of Polyethylene Adhesive Tape for Steel Pipelines" SY / T 0414-2007 "Code for Construction and Acceptance of Petrochemical Water Supply and Drainage Pipe Works" SH3533-2003 "Anticorrosion of Petrochemical Equipment and Pipe Coating Technical Specification "SH3022-1999" Safety Technical Regulations for Petrochemical Construction "SH3505-1999

一分彩2 Project Overview This professional scheme is applicable to the anticorrosion of the water supply and drainage ground pipes of the whole plant of Yan'an Coal and Gas Resources Comprehensive Utilization Project. The buried carbon steel pipes are all anticorrosive with polyethylene adhesive tape after rust removal, creating favorable conditions for the smooth completion of the next process.

3 Construction method

3.1 Construction procedures

3.1.1 Anticorrosion procedures for buried carbon steel pipelines: The construction process inspects and accepts the surface of the carbon steel pipelines (pieces) that have arrived, and performs centralized anticorrosion prefabrication of the pipeline in the anticorrosion prefabrication yard. After the installation, flaw detection and pressure test are qualified, anti-corrosion treatment is performed on the welded part and the damaged part of the anti-corrosion layer. After passing the electric spark test, the next process can be entered.

3.2.1 Surface treatment

一分彩3.2.1.1 Construction site The ground pipe is anti-corrosive in the anti-corrosion field. After the installation and pressure test on site is qualified, repair work is performed on site.

一分彩3.2.1.2 Shot blasting

一分彩3.2.1.2 The steel is hoisted on the feeding roller table, which is directly sent to the shot blasting chamber for shot blasting. The projectiles thrown by the shot blasting machine are used to clean the surface of the workpiece.

一分彩3.2.1.3 Use the projectile cleaning device (rolling brush, shot-receiving screw and high-pressure blow pipe) to accumulate shots on the surface of the workpiece

 

Yan'an Yan'an Comprehensive Utilization Project of Coal, Oil and Gas Resources 3 Shaanxi Chemical Engineering Co., Ltd. Fifth Company

一分彩And purge dust. 3.2.1.4

The rust removal treatment of steel surface shall be implemented in accordance with GB / T8923-1988 "Surface Corrosion Level and Derusting Level of Steel Surface before Painting", reaching GB / T8923-1988

Sa2.5 specified in

Grade (no visible grease, dirt, scale, rust and paint coating on the pipe surface. Any remaining traces should only be

(Spotted or slightly streaked)

, Or according to the relevant documents of the owner. After the pipeline field team has completed the installation and passed the inspection and pressure test, the surface of the carbon steel pipe in all welded parts and damaged repair parts is polished and rusted by mechanical grinder to reach St3 level. 3.2.1.5 After the surface of the steel structure is derusted, self-inspection shall be conducted in a timely manner. After the self-inspection is qualified, it shall be reported to the supervisor for acceptance, and the identification shall be made. 3.2.1.6 Quality inspection and assessment of rust removal. 3.2.1.7 The evaluation of surface cleanliness and surface roughness shall be carried out under good scattered sunlight or under conditions of comparable brightness. 3.2.1.8 Evaluation of surface cleanliness level: visual inspection is used to check compliance with specifications. 3.2.1.9 Grade Evaluation of Surface Roughness: The average value of roughness is measured using a roughness tester and compared with the standard. 3.2.1.10 After removing rust, apply clean rags, brushes, or blow with clean dry compressed air to remove dirt, debris and other residues on the surface of the steel. Prevent the surface of steel pipe from being wet, rusted and secondary pollution. 3.2.1.11 Rust removal shall take into consideration the construction site environment and other factors such as strong wind, rain, fog, snow or outdoor conditions with relative humidity greater than 85 percent. No construction is allowed. 3.2.2 Anti-corrosion treatment 3.2.2.1 The construction of anti-corrosion layer shall be performed at a temperature higher than 3 ° C above the dew point (for specific values, please refer to the instructions of the anti-corrosion material manufacturer). 3.2.2.2 The anticorrosive material shall have a product certificate and test report, and shall be intactly packaged, indicating the product model, batch number, manufacturer, production date, etc.

一分彩Yan'an Yan'an Yan'an Comprehensive Utilization of Coal, Oil and Gas Resources Project 4 Shaanxi Chemical Engineering Co., Ltd. Fifth Company 3.2.2.3 Carbon Steel Pipeline Polyethylene Anticorrosive Tape Anticorrosive Coating Structure: DN≤700 pipelines are reinforced with special grade polyethylene With anti-corrosion layer, thickness ≥1.4mm, tape width 150mm, structure is: primer one-0.4mm thick polyethylene tape inside (with overlap 50-55 percent)-0.4mm thick polyethylene tape outside Tape (overlap 50-55 percent) DN > 700 pipe adopts anti-corrosion layer of reinforced polyethylene adhesive tape, thickness ≥1.0mm, tape width 200mm, structure: primer one-0.4mm thick polyethylene adhesive tape Inner band (lap joint 50-55 percent)-0.3mm thick polyethylene adhesive tape Outer band (lap joint 0-55 percent) 3.2.2.4 Primer application 1) After the surface of the steel pipe is pretreated and painted The time interval before the primer should be controlled within 4 hours, and the surface of the steel pipe must be dry and dust-free. 2) The primer should be evenly mixed in the container. When the primer is thick, the thinner matched with the primer should be added, and it can be applied only after it is diluted to a suitable viscosity. 3) The primer should be applied evenly without defects such as missing coating, clot and sagging, and the thickness of the paint film should be ≥30μm. 4) Do not wind the adhesive tape until the primer surface is dry. 5) Prevent surface contamination during the period. 3.2.2.5 Winding of Adhesive Tape 1) The temperature of unwinding of the adhesive tape should be above 5 ℃. It is recommended to use special winding machine or manual winding machine for winding construction. 2) When the adhesive tape is wound, 150 mm welding reserved sections are reserved at both ends of the pipe (piece). Wind the adhesive tape on the primed pipe (piece) according to 50 ~ 55 percent of the width of the overlapping tape. The beginning and end of the tape should be no less than 1/4 the circumference of the pipe and no less than 100mm, the overlapping seams of the anticorrosive tape and the protective tape should be staggered from each other, the side seams of the adhesive tape should be parallel, not twisted and wrinkled, and the untaped end should be pressed tightly and not warped. 3.2.2.6 Stacking and Handling of Anticorrosive Finished Pipes (Pieces) 1) The number of stacked layers of qualified anticorrosive pipes (pieces) is based on the principle of not damaging the anticorrosive layer. Different types of finished products should be stacked separately and placed between the anticorrosive pipe layers and at the bottom. Soft material to avoid damage to the anticorrosive layer. Suzhou Qianggu Pipe Anticorrosive Material Co., Ltd.


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Suzhou Qiangjiang Pipeline Anticorrosive Material Co., Ltd.

Contact: Cheng Huiqiang

Contact : Li Cong
Telephone:0512-63982510 Mobile phone:13962536717

Mobile phone:13806256210

Fax:0512-63982520
Address: No. 333, Jinxian Road, Jinjiaba, Wujiang District, Suzhou, Jiangsu
Website:www.diendanthanhly.net

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