Pickling 

With the further development of pipeline anticorrosion technology, pickling before anticorrosion has attracted more and more attention from domestic and foreign users in recent years. Especially in foreign anticorrosion projects, steel pipe anti-corrosion production lines without pickling process everything is exempted. In order to meet the continuous requirements of domestic and foreign users for the improvement of pipeline anticorrosive quality, Qingdao Dacang Anticorrosive Co., Ltd. has spent more than three years to organize the research and development of online pickling equipment for the outer surface of steel pipes.

A complete system has been formed from the production of pure water - dispensing - pickling - washing - air drying - acid mist purification - wastewater purification and recycling - standard discharge. It provides technology and equipment support for realizing on-line pickling of outer surface of steel pipe. It has the following characteristics.

1. Wide pipe diameter and high production efficiency.

2. Choose phosphoric acid cleaning solution to reduce the harm to human body and pollution to the environment.

3. Waste liquid can be recovered and reused. At the same time, it can also achieve emission standards.

Internal and external gas heating

Steel tube inner wall preheating system

Function: heating the surface of the steel pipe to the required temperature except for the moisture and oil stains on the surface of the steel pipe.

Composition: flame distributor, gas pipeline system, combustion supporting fan, mobile system, electric control cabinet.

Working principle: preheating the steel pipe before rust removal by natural gas burner. The burning head of the front end of the support rod is inserted into the tube, the flame is heated directly to the tube wall, and the steel pipe is rotated during the heating process to ensure that the heating is uniform and the sealing room of the two ends of the steel pipe is set respectively, so as to ensure the flame is not escaping during the heating process. The flame is not easy. The vent and fan are installed at the top of the The air vent and fan are installed at the top of the sealing room, and the flue gas generated by the combustion process is discharged through the ventilation pipe.

Steel tube outer wall preheating system

Function: preheat the surface of the steel tube.

The system is mainly composed of burner, preheating furnace, chimney, electric cabinet and so on. The working principle is the flame collection of the burner during the preheating process of the steel pipe. The heat is fully utilized by heating from the bottom of the pipe and rotating along the tube.

Bend Pipe 3PE

The equipment is specially designed and developed by our company for the anti-corrosion of bend pipes. The design concept is novel and the equipment is unique. It completely avoids the problem of uneven coating due to the stop of spray swing. The equipment is easy to operate and has four adjustable bits.

Equipment anti-corrosion range: φ219-φ1420mm steel pipe, 3D6D.

For steel bending pipe surface rust removal pretreatment, epoxy powder anti-corrosion, 3PE anticorrosive processing, and a series of operations. Including advanced sensor system, control system, instrument display system and fault alarm system, environmental protection system.

New step 3PE Winding Insulation

By this brand new technology, integral functions including shot blast cleaning, anticorrosion, thermal insulation can be realized at one production line, and the four-layer structure (anticorrosion layer, thermal insulation layer, adhesive layer and protecting layer) is strengthened.

一、Main technical process:

Steel pipe shot blasting cleanings Liquid or FBE powder coating —PU foaming of thermal insulation layer—Copolymer adhesive twining^ PE hot twining.

二、Features

1.Poan adhesive twining, PE protecting layer twining is realized at one time, the working process is smooth for automatic production,which save manpower, time, and is easy to operate.

2.In case of partial water seepage in the insulation layer, the acidic medium produced by water and polyurethane cannot corrode the surface of the steel tube.

3.Copolymer is used for combining the foam layer and PE protecting layer, which makes the bonding performance reinforced. So as to ensure the integrity of the multilayer process and synchronous reliability. The problem of shelling is solved and the problem of water inflow due to the expansion and contraction of the jacket layer is solved. Even if the outer covering of polyethylene is damaged, it will not be threaded.

4.The new process adopts spray foaming, and the foaming holes are uniform and fully solidified and hardened. The foaming quality is visible throughout the whole process, and the resulting gas can be released freely without forming flocs or bubbles in the pipe.

5.The copolymer adhesive layer and the polyethylene layer were finished by the thermal winding process. The original axial stretching molding was replaced by the present radial stretching molding. It changed the direction of molecular structure of outer sheath PE and effectively eliminated the problem of PE layer and thermal insulation layer shelling.

6.The new process automatic operation line is simple and convenient to adjust, and the thickness of the foamed layer and the thickness of the PE layer can be adjusted easily. The production process does not need to change the mold, a variety of pipe diameter (from Φ426 to Φ1620), a variety of thickness of the insulation pipe can be completed on a single line, and more suitable for large diameter pipe.

7.Due to the winding process, it is not necessary to make the jacket layer too thick, which can save polyethylene material. The free foaming process will not form a 2-3mm hard shell compared with the old process, which can save polyurethane materials.

An ancient saying: "Nothing is impossible in business, and nothing is impossible in industry." It is to innovate, if the product does not have the characteristic cannot stand, the enterprise cannot develop. The word "chuang" was opened to reveal that Dacang people, with a knife, were destroying the old to create new ones. Innovation is the eternal theme of development, innovation for pipeline anticorrosion and insulation equipment, innovation for pipeline engineering, innovation for the highest field of pipeline application -- pipeline logistics. This is the goal and mission of Dacang people!