Water pipes are tubes carry pressurized fresh water to buildings. The erosion resistant property of steel pipes and tubes makes a favorite for water system. Steel pipes are capable of handling high velocity and turbulence without effected the wall thickness. It is well known that steel is one of the leading materials in the modern industry and for many years it has been the favored material for water pipes. Such a large application of steel water pipes and tubes are stipulated by their optimal excellent properties: high values of strength and fracture stability in combination with the reasonably good ductility and flexibility, tensile strength, elongation and reduction in area.

Properties of steel water pipes:

Stainless steel water pipes sustain longtime exploitation such as friction and corrosion as well as aging. Even after years of use, these pipes don’t practically change characteristics such as hardness and brittleness. Steel water tubes installed underground are subject to corrosive forces unlike those subject to above ground items. Forces due to soil, water and gases are kept in mind, while designing stainless steel water pipes. For underground application, welded and seamless types of steel pipes are used for the construction of water pipelines.

Water pipes are tubes that carry pressurized fresh water to buildings. It is well known that steel is one of the leading materials in the modern industry and for many years it has been the favored material for water pipes. Such a large application of steel water pipes and tubes are stipulated by their optimal excellent properties: high values of strength and fracture stability in combination with the reasonably good ductility and flexibility, tensile strength, elongation and reduction in area.

Stainless steel water pipes and tubes sustain longtime exploitation such as friction and corrosion as well as aging. Even after years of use, these pipes don’t practically change characteristics such as hardness and brittleness. Steel water tubes installed underground are subject to corrosive forces unlike those subject to above ground items. Forces due to soil, water and gases are kept in mind, while designing stainless steel water pipes. For underground application, welded and seamless types of steel pipes are used for the construction of water pipelines.

Spiral welded steel pipe is made of the low-carbon carbon structural steel or low alloy steel strip according to the angle of the spiral line (called the forming angle) rolled into the tube, pipe and then welded together made, it can narrowstrip the production of large diameter steel pipe.Spiral welded pipe for oil and gas pipelines, its specifications OD * wall thickness. Spiral welded side welding and double-sided welding, the pipe should ensure that the hydrostatic test, the weld tensile strength and cold bending performance to meet the requirements. Spiral welded steel pipe in China is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. The transport of liquids: water supply, drainage. Gas transportation: gas, steam, liquefied petroleum gas. For the structure: for pipe piling for bridges; docks, roads, building structure, pipe, etc.

Spiral steel mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is one of the 20 key development products.

For the transport of liquids: water supply, drainage. Used for gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe for bridges; piers, roads, buildings and other structures tube.

The main industrial use: also known as spiral or helical spiral steel pipe, is a low-carbon steel or low alloy steel strip at a certain helix angle (called molding angle) rolled into a tube and then the tube seam welding made up, it can narrow strip production of large diameter steel pipe. Spiral mainly for oil and gas pipelines, its specifications diameter * wall thickness. There spiral welding and double-sided welding, pipe should ensure that hydrostatic test, weld tensile strength and forming performance to meet the requirements.

An error occurred within the allowable range, the production of any article can not guarantee any of a good quality product, as long as the production of spiral pipe when the error rate can be reduced to a minimum. Pipe production process to correct errors, improve production quality, has become the manufacturer must be controlled.

In the spiral shape, the strip camber angle will constantly change shape, leading to changes in the weld gap, resulting in open seam, wrong side or even take sides. Seriously affecting the quality of the steel, so the observation strip coil-camber situations after, by controlling the vertical rolls so that the disc can be cut and removal of part of camber angle forming the continuous control and corrective camber of the strip is the reduction in the production process effective way of generating the wrong side. Because of the poor do not trimming the strip head and tail shape and size precision, easy to cause docking strip hard bend caused by the wrong side. Strip head and tail docking high over larger weld seam when molding over if not handled properly, likely to cause greater wrong side. Poor strip edge condition is another important reason for the wrong side. Identify the problems in the correct lot easier.

1, the contract provisions will generally spiral steel pipe butt weld indicate whether to allow the customer allows it is entirely possible.

2, spiral steel pipe is a strip coil as raw material, often warm extrusion molding, automatic double wire-sided submerged arc welding process welded spiral seam steel pipe. Spiral steel pipe into the steel unit, multi-channel roll rolling strip gradually rolled up, a gap is formed with an opening round tube, squeeze rollers reduction adjustment, the weld gap control at 1 ~ 3mm, and the weld ends flush.

3, commonly used spiral steel pipe standards are generally divided into: SY / T5037-2008 (Ministry of standard, also known as ordinary fluid pipes with spiral submerged arc welded pipe), GB / T9711.1-2008 (GB, also known as the oil and gas industry the first portion of the delivery pipe technical delivery conditions: a steel grade (demanding a GB / T9711.2 B grade steel)), API-5L (American petroleum Institute, also known as line pipe; which is divided into two levels PSL1 and PSL2 ), SY / T5040-2008 (pile with spiral welded steel pipe).

Double submerged arc welded spiral steel pipe with its high pressure capacity, small resistance, low temperature resistance, corrosion resistance, easy installation and maintenance, etc., is more and more oil and gas, slurry transportation, urban construction and other industries welcome.

Spiral double welding pipe process:

I. double submerged arc welding process, the plate deformation uniformly small, residual stress, surface does not produce scratches. Processing of pipe diameter and wall thickness of the pipe sizes range, greater flexibility, especially in the production of high-grade steel thick-walled steel pipe, large diameter thick wall pipe has the incomparable advantage of other technology, to meet the users in pipe size requirements;

Ⅱ. Presoldering outside welding (the fine welding) the process can be implemented in the best position welding, less prone to the wrong side of the welding partial and incomplete penetration defects such as welding quality, easy to control;

Ⅲ. Overall mechanical enlarged diameter, which can effectively improve the dimensional accuracy of a steel pipe, and improve the distribution state of the stresses in the steel pipe, thus avoiding the damage caused due to stress corrosion, is also conducive to the welded construction of the scene;

Ⅳ. 100% quality check on the steel, so that the whole process of pipe production are effective detection, monitored, to ensure the product quality of the SAW pipe;

Ⅴ. Entire production line equipment have networked with a computer data acquisition system to realize the real-time transmission of data, the quality of the technology in the production process parameters and quality indicators adopted by the central control room.

1 seamless steel tube structure (GB/T8162-1999) is used for general structure and mechanical structure of seamless steel pipe.

2 seamless steel pipe (GB/T8163-1999) is used for conveying water, oil, gas and other general seamless steel pipe.

3. For low and medium pressure boiler seamless steel pipe (GB3087-1999) is used in the manufacture of various structural low and medium pressure boiler superheated steam tube, boiling water pipe and locomotive boiler superheated steam pipe, opium pipe, small pipe and brick works quality carbon structural steel hot-rolled and cold drawn (rolling) seamless steel tube arch.

4. For high pressure boiler seamless steel pipe (GB5310-1995) is for manufacturing high and higher pressure pipe for heating surface of boiler quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipe.

5 high pressure seamless steel pipe (GB6479-86) for chemical fertilizer equipment is a high quality carbon structural steel and alloy steel seamless steel pipe, which is suitable for the high quality carbon structural steel and alloy steel, -40~400, and 10~30Ma.

6. seamless steel tubes (GB9948-88) for petroleum cracking are furnace tubes, heat exchangers and pipe seamless steel tubes for petroleum refineries.

7. Geological drilling with steel tube (yb235-70) is for the Geological Department of the core drilling using steel pipe, according to use can be divided into the drill pipe, drill collar, core pipe, casing and sedimentation tubes.

8. Seamless steel pipe (GB3423-82). The diamond core drilling is used for seamless steel tube diamond core drilling and drill pipe, Yan Xingan, casing of the.

9 oil drilling pipe (YB528-65) is a seamless steel pipe, which is used in both ends of the oil drilling to be thickened or thickened. Sub car steel wire and wire the two cars, car fittings connecting wire tubes, the methods and tools of threading work butt joint.

10. The ship with carbon steel seamless steel pipe (GB5213-85) is producing ship class I pressure piping, II level pressure piping system, boiler and Superheater Tubes Standard Specification for carbon steel seamless steel pipe. Carbon steel seamless steel pipe wall temperature does not exceed 450 degrees, alloy steel seamless steel pipe wall temperature exceeding 450 DEG C.

11. Automobile half shaft sleeve pipe seamless steel pipe (gb3088-82) is the manufacture of automobile axle casing and driving axle shells effective quality carbon structural steel and alloy structural steel hot-rolled seamless steel tube.

Domestic steel pipe scaffolding material have steel tubular scaffolding, steel scaffolding tube bowl button, socket type steel scaffolding, gantry scaffolding. There are all kinds of scaffolding, hanging scaffolding pick scaffolding pipes and other materials. Its material and construction to proceed with the case, can be roughly divided as follows:

Divided by material rod

1). Single standard steel scaffolding. It only uses a standard steel pipe. Such as steel tubular scaffold, only Ф48 × 3.5 welded pipes.

2). A variety of specifications of steel pipe combinations scaffolding. It consists of two or more different sizes of steel pipes, such as gantry scaffolding.

3). In steel-based scaffolding. That is mainly steel, and other types of scaffolding steel rod member constituted supplemented. As provided channel backwater or scaffolding base, there are connecting plate pick scaffolding.

Cuplock steel scaffolding when used in the steel rail as a "single pipe scaffolding." When using steel side rails ride for the "steel-based scaffolding."

By way of transfer of the vertical force between the bar and the Pole division

1). By the contact surface friction force transmission. Namely by frictional contact surfaces at the node after pressing reaction force to support the rail loading and pass pole, such as the role of fasteners, bolts through positive pressure on the friction force;

2). By weld force transmission. Most of the bar and the Pole socket coupling is in this way, the door frame also belong in this way;

3). Direct pressure force transmission. This way is more common in the bar resting on top of the scaffolding pole;

4). By the pin shear force transfer. That is with the pin through the crossbar and uprights vertical coupling plate holes to achieve coupling, the pin-sided by the shear force. This approach in the bar and pole coupling has been rare.

In the pole with pole coupling, there are three kinds of power transmission mode:

1). Docking socket supporting force transmission. That butt up and down the pole, using connecting rods or intubation to ensure docking in good condition;

2). The pin connected to the pin shear force transfer;

3). The fastener engaging force transmission connection. That external thread of the inner tube and the outer (jacket) internal thread engaging force transmission tube. Wherein the latter two pole power transmission mode used for adjusting the height requirements of the connection.

1. Scaffolding load should not exceed 270kg / m2. Experience before use income qualified listing. Use should always check and maintenance. Load over 270kg / m2. Or in the form of special scaffolding should be designed.

2. Steel column should be set metal base. On the basis of geological soft mat board should be set up or sweep shot.

3. Scaffolding pole should be vertical. Vertical deviation must not exceed the height of 1/200. Pole spacing of not more than two meters.

4. Scaffolding at both ends, and every corner pillars should be set 6-7 with a knife support strut. At the height of 7 m above can not be set up pickets. Vertical every 4 meters. Transverse seven meters must be connected to every building firm.

5. Outside of the scaffolding, ramps, platforms, set 1.05 m fence. Bamboo or wood when laying. Two lashing must firmly. Not binding on non-operational.

6. The channel and the escalator at heightening scaffolding bar should be reinforced. Not hinder passage.

7. Usually pick scaffolding crossbar pitches 1.2 meters. To set up and add bracing. Bracing and the vertical angle of not more than 30 °.

8. In order to prevent pressure bent tube rack slide fastener from the tube head. Each rod member intersects the projected ends are greater than 10 cm.

9. If scaffolding erection place when power lines or electrical equipment. It must meet the safety distance requirements. Erection and measures taken to stop transmission when removed.

10. Scaffolding acceptance. Responsible for all parts visual inspection. And implement and supervise the use of the system acceptance.

11. Scaffolding erection ago. Must stand pipes, fasteners, bamboo, wire to be checked. Pipe rack severely bent. Fasteners severe corrosion cracking. Rafts rotting must be scrapped. Shall not be used.

12. It prohibits the direct take on the scaffolding on the floor leaning against the wooden flute and calculated without loading up heavy moiety. Or scaffolding and the scaffolding planks fixed to the building is not very solid structure (such as railings, pipes, etc.).

13. Planks and scaffolding should be firmly connected to each other. Scaffold boards should be placed on the two ends of the crossbar. Firmly fixed. Scaffold boards are not allowed between the span of the joint.

14. Planks and boards for a paved ramp to the rack rails. On the outside of both sides of the chute, chute and scaffolding corner face. It should be set 1m high railing. And provided at its lower plus 18cm high guard.

15. Scaffolding should be fitted with a solid ladder. So that staff up and down and transporting material. With lifting gear when lifting heavy objects. It allowed the lifting gear and scaffolding structures are connected.

16. Scaffolding erection work of leaders to deal with the ride of the scaffolding for the qualification and issue a written proof behind the prospective use. Daily maintenance work responsible person should check the status of the use of scaffolding and scaffolding boards. If defects. To be renovated immediately.

17. Non-readily with barrels, boxes, bricks and other building materials to build temporary substitute for the formal scaffolding planks.

18. Prohibit Luanla wire scaffolding. Temporary lighting must be installed when the line. Bamboo scaffolding should be added to the insulator. Metal pipe scaffolding should separate wooden cross arm.

19. Installation of metal pipe scaffolding. Prohibit the use of bending, flattening or have the tube cracks. Successive portions of each tube to be intact. Against dumping or movement.

20. Metal pipe scaffolding pole. You must be perpendicular to the stability on the pad. Before placement pad to ground compaction, leveling. Pole should be put on pedestals. Column holder is made of a post base and welded tubes on the bottom plate.

twenty one. Metal scaffolding pipe joints. Application of a special hinge overlapping each other. This applies to the hinge angle. Also applies to acute and obtuse (for bracing, etc.). The connection between the various components of the hinge bolts must be tightened.

twenty two. Scaffold boards must be fixed to a metal pipe scaffolding beams.

twenty three. When the mobile scaffold. All staff must be on the scaffolding down. The above work was prohibited mobile scaffolding.