Apply the stripping agent to the inner wall of the membrane. The coating should be uniform and the thickness should be consistent. At the same time, the plastic film should be adhered to the inner wall of the membrane to prevent the release agent from adhering to the foam layer and affect the quality of the FRP winding.
4.2 Quality control of foam insulation layer casting Firstly fix the membrane tool so that the membrane is concentric with the steel tube, and keep the steel tube hanging into the membrane with two ends at 200±50mn; reasonably adjust the materials of A and B components and foaming parameters, Ensure that the cells are even and fine, the foam should be free of stains, and there is no shrinkage and delamination. The foam density at any position should not be less than 60kg/m3; the film should be foamed with a whole film, which can be divided into one or more times according to the single dosage. When pouring, the foam should be evenly filled with the entire annular space of the steel pipe and the membrane. The dimension of any single hole should not exceed 1/3 of the thickness of the same layer of insulation; the membrane should be tested from time to time to prevent deformation of the membrane. The thickness deviation of the foam layer exceeded the standard.
3.4.3 Quality control of stripping and tube trimming (1) The steel pipe after filming shall be placed on a special platform and the foam layer shall be separated from the ground.
(2) Remove the plastic film from the surface of the steel pipe foam after filming, repair the foam of the flash, and clean and repair the foam within 200mm of the pipe end.
(3) Inspect the repaired insulation layer, repair the rounding, and fill in the defects.
4.4 Quality control of FRP protective layer production (1) Modulation of unsaturated polyester resin: The unsaturated polyester resin is reasonably adjusted according to the change of ambient temperature, and the amount of material is controlled by manual feeding method.
(2) FRP winding: This process uses a microcomputer controlled, semi-automatic mechanical wet method to wind the FRP. After the foam insulation layer is repaired, the FRP winding device is wound in the circumferential direction and the cross process to achieve uniform winding and no leakage. The thickness of the FRP should not be less than the requirements of the design; the yarn should be properly woven and woven during winding, in the control program. The parameters such as thickness and length of the insulation layer should be accurately input to ensure uniform thickness of the outer sheath and material saving. At the same time, the manual tracking type scraping material must be used to reduce the waste caused by resin dripping, and at the same time control the thickness of the outer sheath of the glass fiber reinforced plastic and the quality of the wound appearance. : The outer surface of FRP should be free of leakage glue, fiber exposure, air bubbles, interlayer detachment, significant wrinkles, uneven color tone, etc.; after the FRP is wound, the glass glazing film is used as the final outer wall wrapping work to ensure the outer wall is smooth and clean. The requirement to protect the FRP winding layer from flowing.
(3) Tip seal: In order to prevent the anti-corrosion insulation layer from pre-fabrication, water and moisture enter the insulation layer from both ends, and the end face of the insulation layer should be coated with unsaturated polyester resin or polyurethane waterproof coating.
3.5 Quality control of inspection and test 3.5.1 Purchase inspection and test materials The supply group shall inspect and test the incoming products in time according to the quality requirements in the incoming inspection procedures of materials, and release them into the warehouse after passing the qualifications. Control program processing; for the products provided by the owner, if the evidence of the qualification is complete, it still needs to be tested according to a certain proportion.
5.2 Process Inspection and Test Project The quality inspector shall, in accordance with the relevant provisions of the “Construction Acceptance Specification†and “Quality Inspection and Evaluation Standards†and the quality system documents of the project, re-examine the raw materials, and then pass the construction technology to the construction team. Organize construction work group self-inspection, mutual inspection and -332-, special inspection of quality inspectors, and do a good job of all quality records, all projects in the relevant personnel after inspection, should report to the project supervision in a timely manner, and have engineering supervision Proof of written evidence of the quality of the process.
3.5.3 Final inspection and test After the verification of all inspections and tests is completed, the final inspection and test of the engineering products shall be carried out. For the release of the final inspection and test, the corresponding inspection and test report shall be presented to the owner, and the signature shall be complete. The release process, inspection and test records of the final inspection and test are extremely important. First, the inspection and test personnel shall record the parameters of the inspection and test in a timely and accurate manner according to the quality record form specified by the owner; second, the quality inspector of the project shall pay attention to the inspection and repair of unqualified materials or products, and do a good job with the non-conforming product. The interface for control; the third is to indicate the responsible releaser and the tester.
4 Conclusion Through the quality assurance and quality control activities of pipeline anti-corrosion construction, the “unqualified†in the anti-corrosion construction process of FRP outer sheath insulation pipe is effectively prevented, the product defects are kept to a minimum, and the construction acceptance specified by the owner is satisfied. The requirements of specifications and quality standards ensure the quality of engineering products, improve the quality reputation of enterprises, open up the external market, and increase the huge economic benefits.
(Finish)
Aluminum Cold Drawn tube is a kind of Aluminum Tube which is produced by cold drawn technology.Aluminum tube is a kind of non-ferrous metal. It is widely used in many fields. You may not know that aluminum tube is also used in your car, especially in your home life. It is also indispensable in other fields such as aviation, ship and agriculture.Trumony is always doing innovation on the material,Targeting to bring to technology to the ground by our aluminum material.Trust in harmony,we care what our clients care
Aluminum Cold Drawn tube
Aluminum Pipe,Aluminum Tube Price,Hollow Aluminum Tube,Aluminum Radiator Tubing
Trumony Aluminum Limited , https://www.trumonyalu.com