1、 De ion of pipe wall structure:

The pipe wall structure is divided into inner liner, secondary liner, winding and outer protective from inside to outside.

The inner liner and secondary inner liner play the role of corrosion prevention and seepage prevention, the winding plays the role of strength and rigidity of the pipeline, and the external protective plays the role of aging resistance, corrosion prevention and sun resistance.

2、 Manufacturing process flow of FRP pipe

→ Mold preparation

→ Equipment commissioning and raw material preparation

→ Fabrication of pipe lining

→ Far infrared curing station lining curing

→ Lining quality inspection

→ Winding of pipe reinforcement

→ Overall curing of far-infrared pipeline

→ Inspection of pipe appearance and main dimensions

→ Pipe demoulding

→ 1.5 times the working pressure hydraulic test and other inspection items required by the standard

→ Pipe packaging and warehousing

3、 Process details:

(1) Preparation process

A. Equipment commissioning

First of all, carefully check whether the equipment operation and working parts are normal, especially whether the resin-curing agent two-component pump is blocked, and whether the ratio between them meets the design requirements; To ensure the operation stability and working accuracy of equipment such as lining, winding, trimming and demoulding;

B. Clean the mold

The mold surface shall be free of pits, dust, sundries and other attachments. The mold surface shall be smooth, and the problem shall be repaired and maintained in time;

C. Wrap polyester film

In order to facilitate pipe demoulding, a of polyester film shall be coated on the surface of the mold, with a film overlap width of 1~2cm and a thickness of 40um. The film is required to be free of damage, wrinkles and smooth and clean on both sides. The quality of film products shall meet the requirements of GB 13950-1992.

(2) Lining process

A. Preparation of lining resin

The lining resin shall be mixed according to the resin formula system made by the quality inspection department according to the working environment and temperature conditions at that time, and the mixing amount shall be reasonably controlled according to the manufacturing progress. When the site conditions change, the quality inspection department and the manufacturing department shall adjust the formula in time and prepare the required resin according to the new formula;

B. Preparation of reinforcement materials

According to the design requirements, the reinforcement materials needed for lining production shall be transported to the designated location, and some reinforcement materials with wide width shall be cut and processed to the design width;

C. Manufacturing of inner liner

The inner liner shall be made according to the laying steps required by the design. During the laying of each single , a reasonable tension shall be applied, an appropriate amount of overlap shall be made between each other, and the combined roller shall be used to repeatedly roll out bubbles to ensure that the fiber is completely soaked. It is required that each reinforcing material meet the designed resin content requirements;

D. Preliminary self-inspection

After each is paved according to the design requirements, the operator is required to carry out preliminary quality inspection: whether the lining reaches the design thickness, whether there is lean glue, glue hanging phenomenon in some parts, whether there are white spots, bubbles, and whether there are, etc. If any of the above conditions occur, the operator shall timely report and take treatment measures;

E. Enter the far infrared deep curing process of lining

(3) Far infrared deep curing

The glass fiber reinforced plastic pipes produced must be subject to far-infrared deep curing treatment in order to improve the curing degree of the inner liner and the corrosion and temperature resistance of the pipes;

(4) Process quality inspection

Before winding, reconfirm that the lining is free of bubbles, pores, impurities, flat surface, reasonable resin content, white spots and local curing defects. It is necessary to carefully check whether the lining is qualified, and it is forbidden to wind the unqualified lining on the machine.

(5) Winding process

Input the designed parameters into the computer, and after the lining is solidified, the computer controls the reciprocating winding of alkali-free and untwisted glass fiber until the thickness of the winding . External protective with 100% resin content shall be applied according to the specified thickness. The resin content of the winding is generally about 35%, and its thickness depends on the combination of strength and rigidity of the pipeline design.

(6) Infrared curing

The pipeline enters the curing and curing stage. During the curing process, the mold should be kept rolling at a suitable speed to make it uniformly solidified. During the curing process, pay attention to monitoring the temperature of the pipe body and adjust the curing plan reasonably.

(7) Finishing and demoulding

When the hardness of the pipe is greater than 30, the pipe end shall be trimmed. Then use the hydraulic release machine to separate the pipe from the mold, and mark the middle part of the pipe as required.

(8) Pipeline hydrostatic test and placement

Each batch of pipes shall be subject to water pressure test according to regulations, filled with water, evenly boosted to 1.5 times the design pressure of the pipe, and kept for at least 2 minutes, and the surface and pressure gauge of the pipe shall be carefully checked. After passing the pressure test, the pipeline shall be placed at three points.