Production process of spiral pipe

Production process of spiral pipe shared by Spiral Pipe supplier China.

(1) raw materials: strip coil, welding wire, flux. Rigorous physical and chemical examination must be carried out before investment.

(2) the end of the strip shall be butt joint by single wire or double wire submerged arc welding. After the steel pipe is rolled, automatic submerged arc welding shall be adopted.

(3) before forming, the strip is smoothed, trimmed and planed, its surface is cleaned and transported, and its edges are bent.

(4) electric contact pressure gauge is adopted to control the pressure of oil cylinder on both sides of the conveyor, ensuring the smooth transportation of the strip.

(5) external control or internal control roll forming.

(6) weld gap control device is adopted to ensure that weld gap meets welding requirements, and pipe diameter, wrong edge quantity and weld gap are strictly controlled.

(7) internal and external welding are performed by single or double wire submerged arc welding with American Lincoln welding machine, so as to obtain stable welding specifications.

(8) all welded welds are inspected by online continuous ultrasonic automatic flaw tester, ensuring 100% non-destructive testing coverage of spiral welds. If there are defects, automatic alarm and spraying mark, production workers according to this at any time to adjust the process parameters, timely elimination of defects.

(9) use an air plasma cutting machine to cut the steel tube into a single root.

(10) after cutting into a single steel pipe, each batch of spiral steel pipe shall carry out a strict first inspection system to check the mechanical properties of welding seams, chemical composition, dissolution status, surface quality of steel pipes and through nondestructive inspection to ensure that the pipe production process is qualified, before it is officially put into production.

(11) where there is continuous acoustic inspection mark on the welding seam, manual ultrasonic and X-ray reexamination shall be conducted. If there is a defect, it shall be repaired and then nondestructive inspection shall be conducted again until it is confirmed that the defect has been eliminated.

(12) the tube where the butt welding seam of strip steel and the t-joint intersecting spiral welding seam are located shall all be examined by X-ray television or film.

(13) each steel pipe is tested by hydrostatic test, and the pressure is radial sealed. The test pressure and time are strictly controlled by the microcomputer testing device of steel pipe water pressure. Automatic printing record of test parameters.

(14) the Oil Pipeline Spiral Steel Pipe end is machined to control the verticality of the end face, groove Angle and blunt edge accurately.

What Are Galvanized Steel Pipes

Hot dip galvanized pipe

The hot-dip galvanized tube is obtained by reacting a molten metal with an iron matrix to produce an alloy layer, thereby combining the substrate and the plating layer. Hot-dip galvanizing is to pickle the steel pipe first, in order to remove the iron oxide on the surface of the steel pipe, after pickling, it is washed by ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then fed. Hot dip plating tank. Hot-dip galvanizing has the advantages of uniform plating, strong adhesion and long service life. Hot-dip galvanized steel pipe base

 Complex physical and chemical reactions with the molten bath to form a corrosion-resistant, compact zinc-iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel pipe base, so it has strong corrosion resistance.

Cold galvanized pipe

The cold-galvanized pipe is electro-galvanized, with a small amount of galvanizing, only 10-50g/m2, and its corrosion resistance is much worse than that of hot-dip galvanized pipe. Regular galvanized pipe manufacturers, in order to ensure quality, most do not use electro-galvanizing (cold plating). Only small companies with small equipment and old equipment use electro-galvanized steel, of course, their prices are relatively cheaper. The Ministry of Construction has officially laid down the cold-galvanized pipe with backward technology and the use of cold-galvanized pipe as water and gas pipe. The galvanized layer of the cold-galvanized steel pipe is an electroplated layer, and the zinc layer and the steel pipe base are separately layered. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe base and is easy to fall off. Therefore, its corrosion resistance is poor. In new homes, the use of cold-galvanized steel pipes as water supply pipes is prohibited.

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Spiral 3pe Anti Corrosion Steel Pipe

Spiral 3pe Anti Corrosion Steel Pipe  Anti-corrosion Pipe  3PE Pipe

Three-layer structure polyethylene (3PE) anticorrosive coating has been widely used in petroleum pipeline industry for its good corrosion resistance, water and gas permeability and mechanical properties.

Standard:	API, ASTM, GOST,GB, etc.
Material	Gr.B, X42,X46,X52,X56,X60,X65,X70,X80, S335, S355JR,S355JOH,ST52etc.
Size	OD: 219-3600mm, Thick: 5-25.4mm
Length	6m-12m or customed
Application	Gas transportation ( oil, natrual gas)
	Fluid ( water supply and drainage)
	Structure (piling, bridge Wharf, road, construction structure, ect）
Surface	Bare, Coating, Anti-corrosion, 3PE/PP/FBE. etc
Package	Standard Sea Worthy Package or as per customer required

Steel tube outer wall corrosion protection form 3PE anticorrosion generally consists of three layers: First layer epoxy powder (FBE>100um),Second layer adhesive (AD) 170 ~ 250um. The third layer of polyethylene (PE) is 1.8-3.7mm In practice, three kinds of materials are mixed and integrated to form an excellent anticorrosive layer. Its processing mode is generally divided into two types: winding type and circular die cladding type.

3PE anticorrosive steel pipe coating is a new kind of anticorrosive steel pipe coating, which is a combination of 2PE anticorrosive coating in Europe and epoxy powder anticorrosive steel pipe coating (FBE) widely used in North America. It has been recognized and used all over the world for more than ten years.

The coating of 3PE anticorrosive steel pipe is epoxy powder anticorrosive coating on the bottom layer and the surface of the steel pipe, and the intermediate layer is copolymer adhesive with branch structure and functional group. The surface layer is a high density polyethylene anticorrosive coating.

Three PE anticorrosive coating combines the characteristics of high impermeability and high mechanical properties of epoxy resin and polyethylene. Up to now, it is the best anticorrosive coating with the best effect and performance, which has been used in many projects.

For the use of 3PE anticorrosive steel pipe many people only know one do not know the other, its role is really a very wide coverage, it is suitable for underground coal mine drainage, shotcrete, positive and negative pressure ventilation, drainage gas, fire sprinkler pipe network. Thermal power plant process water waste residue, return water pipeline. It has excellent applicability for water supply pipeline of anti-spray and sprinkler system. Power, communication, highway and other cable protection sleeve. Suitable for high-rise building water supply, heat supply network, tap water engineering, gas transmission, buried water and other pipelines. Petroleum transportation pipeline, chemical industry, pharmacy, printing and dyeing and other industries conveying corrosive medium process pipeline. Sewage treatment discharge pipe, sewage pipe and biological pool anti-corrosion engineering. It can be said that 3PE anticorrosive steel pipe is indispensable in the current construction, and it is believed that with the extension of science and technology, it will have more brilliant achievements in the future.

Ordinary steel pipe in the use of harsh conditions, can appear serious corrosion, which will reduce the service life of steel pipe, anti-corrosion insulation pipe service life is longer, generally is 30 to 50 years or so, you can use and correct installation and use is also can make the network maintenance costs low, anti-corrosion insulation pipe also can set the alarm system, automatic detection of pipeline leakage fault, the knowledge of the accurate fault location and alarm automatically.

Anti-corrosion Pipe heat preservation performance is good, heat loss is only twenty-five percent of the traditional pipe, long running or can save more resources, significantly lower energy costs, and has the stronger ability of water resistant and corrosion resistant, and also do not need to attached pipe trench, can be directly buried underground or in the water, on the construction is simple rapid, comprehensive cost is low, under the condition of low temperature and has good corrosion resistance and impact resistance, and in a certain environment can directly buried permafrost.

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FBE Pipe Anti-corrosion Pipe Factory

FBE Pipe  Anti-corrosion Pipe Factory

Our company is specialized in produce FBE Pipe and Anti-corrosion Pipe, Our products are very popular, if you are interested in our products, please contact us as soon as possible!

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Painted Pipe hermal Insulation Pipe factory

Painted Pipe hermal Insulation Pipe factory

If you are finding Painted Pipe and Thermal Insulation Pipe factory in China, we will be your best choose! We have our own factory, so we can give you a cheap price!

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