How to choose spiral welded pipe according to your needs?

 How to choose spiral welded pipe (SSAW) according to your needs?

1. Understand the basic parameters

Before choosing a spiral welded steel pipe, it is crucial to understand the following basic parameters:

Diameter: The diameter of the steel pipe is usually determined based on the needs and flow rate of the conveyed material.

Wall thickness: Wall thickness determines the load-bearing capacity and impact resistance of the steel pipe. Depending on the use occasion, such as underground, underwater or on the surface, the choice of wall thickness will also vary.

Material: The material of the steel pipe is usually related to its corrosion resistance, wear resistance and temperature resistance.

2. Analyze engineering requirements

Every project has its specific needs. For example, oil pipelines may require special anti-corrosion treatment, while urban water systems pay more attention to the safety and reliability of pipelines.

3. Consider the usage environment

Temperature: Steel pipes used in high temperature environments need to have good high temperature resistance.

Chemical Exposure: In chemical plants or other locations susceptible to chemical contamination, steel pipe needs to have excellent chemical stability.

Geographic location: For example, salt spray environments in coastal areas can cause corrosion to steel pipes.

4. Choose the right model

There are many types of spiral welded steel pipes, which can be classified according to their production process and functions:

Basic type: suitable for general building structures and mechanical structures.

Anti-corrosion type: with special anti-corrosion coating, suitable for humid and chemical environments.

High-pressure type: suitable for high-voltage transmission lines, such as oil and natural gas transmission.

5. Communicate with suppliers

Many suppliers offer customization services and are able to produce steel pipes according to a customer's specific needs. Ensure adequate communication with suppliers to clarify the specific requirements of the project.

6. Consider cost factors

In addition to the direct steel pipe costs, you should also consider the associated costs of transportation, installation, maintenance and replacement. Choosing the right steel pipe model and specification can result in significant savings throughout the life of the project.

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Surface treatment of spiral tubes

Spiral pipe derusting and anti-corrosion process:

Derusting is an important part of the anti-corrosion process of spiral welded pipe pipelines. At present, there are many derusting methods, such as manual derusting, sand blasting and pickling and so on. Among them, manual rust removal, mechanical rust removal and painting rust removal (anti-corrosion brushing oil) are relatively common rust removal methods. The following is a brief introduction to the specific operation requirements of these three rust removal processes by welded pipe manufacturers.

1) Manual rust removal

Use scrapers and files to remove the oxide skin and casting sand on the surface of the pipes, equipment and containers, and then use a wire brush to remove the rust on the surfaces of the spiral pipes, equipment and containers, then polish them with sandpaper, and then use cotton silk to remove them. Wipe clean.

2) Mechanical descaling

First remove the oxide skin and casting sand on the surface of the pipe with a scraper and a file; then one person is in front of the rust remover, and one person is behind the rust remover, and the pipe is placed in the rust remover repeatedly to remove rust until the metal color is exposed; brush Before oiling, wipe it again with cotton silk to remove the floating ash on its surface.

3) Anti-corrosion brush oil

Pipes, equipment and container valves are generally subjected to anti-corrosion and oil brushing according to the design requirements. When there are no design requirements, the following regulations shall be followed:

1. Exposed pipes, equipment and containers must be painted with an anti-rust paint first, and then painted with two top paints before handover. If there are requirements for thermal insulation and anti-condensation, two anti-rust paints should be painted;

2. Two coats of anti-rust paint should be applied to concealed pipelines, equipment and containers. The second coat of anti-rust paint must be painted after the first coat of paint is completely dry, and the consistency of the anti-rust paint should be appropriate;

3. When the buried pipeline is used as the anti-corrosion layer, if the construction is carried out in winter, it is advisable to use rubber solvent oil or aviation gasoline to dissolve 30 A or 30 ethyl petroleum asphalt. Two kinds:

① Manual brushing: Manual brushing should be applied in layers, each layer should be reciprocated, criss-crossed, and the coating should be kept uniform without missing or falling;

② Mechanical spraying: When spraying, the sprayed paint flow should be perpendicular to the spraying surface. When the spraying surface is flat, the distance between the nozzle and the spraying surface should be 250-350mm. If the spraying surface is an arc surface, the distance between the nozzle and the spraying surface should be about 400mm. , When spraying, the movement of the nozzle should be uniform, the speed should be maintained at 10 ~ 18m/min, and the compressed air pressure used for spray painting should be 0.2 ~ 0.4MPa.

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Spiral welded pipe anti-corrosion technology

　　The individual quality spiral welded pipe is relatively large, so it is necessary to be placed outdoors. However, this will be difficult to avoid the sun and rain, the rust has been plagued spiral welded pipe storage time and conditions. We need to conduct a comprehensive answer on rust knowledge of spiral welded pipe.

　　The main method is to use steel wire to brush the surface grinding, cleaning and preheating the spiral welded pipe can remove or loose or tilt of the oxide scale, rust and welding slag. Hand tool rust can reach Sa2 level, power tools rust can be achieved Sa3 level, if attached to a solid steel sruface oxide skin, tools rust effect is not ideal which can not reach the anchor pattern depth of anti-corrosion construction requirements.

　　Pickling by solvent or emulsion can clean low pressure liquid delivery pipe surface. It can achieve the removal of oil, grease, dust, lubricants and similar organic matter, but it can not remove the steel surface rust, scale, welding flux etc.

　　General chemical and electrolytic picking are two ways to do, pipeline corrosion using only chemical pickling can descaling, rust, old coatings, and sometimes used as a sand-blasting after reprocessing. Although chemical cleaning the surface can reach a certain cleanliness and roughness, the anchor pattern shallow, and easy to pollute the environment stacking spiral welded pipe.

　　When the rational use of means to clean rusty pipe and fittings, we guarantee long service in production, creating more production efficiency.

Anticorrosion technology for spiral welded pipe

　　We all know that the individual quality of spiral welded pipe is relatively large, so it must be stacked outdoors. But it is difficult to avoid being exposed to the sun and rain. So the rust problem has been puzzled the storage time and conditions of spiral welded pipe. Today, we need to carry out a comprehensive solution to the knowledge of anti-corrosion technology of spiral welded pipe.

　　The toolrust-removal of spiral welded pipe mainly uses steel wire brush and other tools to polish the steel surface, and then cleans and preheats the spiral welded pipe, which can remove loose or turnup mill scale, rust, welding slag and so on. Using manual tool to remove rust can reach Sa 2 level, using power tools can reach Sa 3 level. If there is steady oxide-scale adhering to the steel pipe surface, the effect of toolrust-removal is not ideal, it can not up to the depth of abrasion pattern that required by anti-corrosion construction.

　　Pickling refers to use solvents, emulsions to clean the surface of the spiral welded pipe (SSAW steel pipe) delivered by low pressure fluid, to achieve removing of oil, grease, dirt, lubricants, and similar organic matter, but it can not remove the rust, mill scale, welding flux, etc. on the surface of spiral welded pipe. So Pickling can only as an auxiliary mean in the anti-corrosion production. Manufacturer general use chemical and electrolytic two methods for pickling treatment, pipeline anti-corrosion technology only adopts chemical pickling, that can remove mill scale, rust, the old coating. And sometimes it can be used as re-treatment after derusting by sandblast. Although Chemical cleaning can make the surface to achieve a certain degree of cleanliness and roughness, but its anchor is shallow, and it is easy to cause stacking environment pollution of spiral pipe welding.

　　Reasonable using the means to clean the rusty pipe can ensure that spiral welded pipe serves the production for a long time and create more production efficiency.

Characteristics and application of small diameter spiral welded pipe

　　Although small caliber spiral welded pipe is small, its function is a lot. So what the features and uses of small diameter spiral welded pipe are?

　　Features of small-diameter spiral welded pipe:

　　The production process of spiral welded pipe is simple, but it has high production efficiency. It can use material to form a larger pipe diameter pipe, it can also use the same width of preform body to product pipes with different diameter. However, compared with the same LSAW steel pipe, the length of weld seam is increased by 30% to 100%, and its production rate is low. Therefore, the smaller diameter of the steel pipe mostly use straight welding, large diameter welded pipes mostly use spiral welded pipe.

　　Uses of small-diameter spiral welded pipe:

　　Spiral welded pipe is mainly used in tap water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, and it is one of the 20 key products for the development of China. It is used for liquid delivery: water supply, drainage. It is used for gas transmission: gas, steam, liquefied petroleum gas. It is used for the structure: piling pipe, bridge girder, the pipe for wharf, road, building structure and so on.

Spiral welded pipe production process

　　Spiral welded pipe (some people call it SSAW steel pipe) is also a kind of welded pipe, its strength is generally higher than the LSAW steel pipe. Spiral welded pipe with large diameter can be produced by the narrow blank, and SSAW steel pipe with different diameter can also be produced by the same width of blank. However, compared with the same length of the straight pipe, the weld length increased by 30 to 100%, and the production rate is low. Therefore, the smaller diameter of the pipe mostly use LSAW steel pipe, large diameter welded pipe mostly use spiral welded pipe.

　　The production process of spiral welded pipe

　　Spiral welded pipe is the steel pipe with spiral seam that using the strip coil as raw material, extrusion forming under normal temperature, and using automatic double wire double-sided submerged arc welding process to weld.

　　1.Raw materials are coil, wire, flux. Those must finish the rigorous physical and chemical testing before putting into.

　　2.The head and tail of strip steel butt joint, use single or double wire submerged arc welding, and use automatic submerged arc welding to repair welding after rolled into steel pipe.

　　3.Before forming, the strip will go through the leveling, cutting edge, planing edge, surface cleaning and delivery to the edge of the treatment.

　　4.Using electrical contact pressure gauge control the pressure of the cylinder on both sides of the conveyor to ensure the smooth delivery of the strip.

　　5.Use external control or internal control roll forming.

　　6.Use weld gap control device to ensure that the weld gap to meet the welding requirements, diameter, misalignment and weld gap are strictly controlled.

　　7.Welding and external welding all use American Lincoln welding machine to single or double wire submerged arc weld, in order to obtain a stable welding specifications.

　　8.The welding line after welding must go through on-line continuous ultrasonic automatic injury inspection to ensure that 100% of the spiral weld non-destructive testing coverage. If there are defects, automatic alarm and spray marking, production workers adjust the process parameters at any time, eliminate of defects timely.

　　9.Use air plasma cutting machine to cut a single pipe.

　　10.After cutting into a single steel pipe, the first three of each batch of steel pipe must be carried out a strict first inspection system, to check the weld mechanical properties, chemical composition, melting conditions, steel pipe surface quality and after nondestructive testing to ensure that the pipe process qualified, so it can be put into formal production.

　　11.There are parts marked by ontinuous acoustic flaw on the seam, after manual ultrasound and X-ray review, if there are defects, after repair, again after the nondestructive test until the defect has been confirmed to eliminate.

　　12.The butt welds and helical welds of strip steel where the junction of the Ding-type joints, all through the X-ray TV or film inspection.

　　13.Each pipe must go through the hydrostatic test, the pressure using radial seal. Test pressure and time by the steel pipe hydraulic microcomputer detection device strictly controlled. Test parameters are automatically printed.

　　14.Pipe end machining, so that the vertical face, bevel angle and blunt edge to be accurately controlled.

The Purpose Guidance of Welded Steel Pipe

　　Generally speaking, the welded steel pipes are divided into general welded pipe, galvanized welded pipe, oxygen welding tube, metric system welded tube, transformer tube, welding thin wall pipe and spiral welded pipe etc.

　　General welded pipe:

　　General welded pipe adopts Q195A, Q215A and Q235A or mild steel as raw materials. It is used to transfer the low pressure fluid. In addition, the pipes need water pressure, bending and flattening test etc. Usually, it has some certain requirements on the surface quality.

　　The length of delivery is often from 4 to 10mm. The specifications of welded pipe in nominal diameter are different from actual size. Depending on the wall thickness, welded pipe are also divided into common steel pipe and thicken steel pipe.

　　Galvanized welded pipe:

　　In order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrical-galvanized pipe with low cost.

　　Metric system welded tube:

　　The metric system welded tube is made from the common carbon steel, quality carbon steel or low alloy steel with the hot and cold welding or after hot welded by the cold again. The specification adopts the seamless steel pipe form with outside diameter*wall thickness (mm). The common metric system welded tube is usually used as structural elements like axis of rotation or transporting the fluid etc. The thin-walled tube is utilized for processing furniture, lamps and lanterns. But the manufacturers need to guarantee the strength and bending of steel pipe in the processing.

　　Spiral welded tube:

　　The spiral welded tube uses low carbon structural steel or low alloy structural steel strip according to certain helix angle (forming angle) rolled into a tube billet, then welded the pipe joints to be made. The spiral welded tube can use narrow strip steel to produce large diameter steel pipe. It is broadly applied as oil or natural gas pipeline. Moreover, spiral welded pipe has one side welding and double sided welding.

Spiral submerged arc welding pipe prefabrication technology

　　Pre-finishing technology is the large diameter welding thick-walled spiral pipe production of oil and gas pipelines in the more advanced technology.

　　The first step in the pre-bonding method using fine production of spiral welded pipe, which was followed by gas welding continuously welded steel strip on the molding machine, pre-weld tube consequent plasma cutting machine cut into a predetermined length of pipe the second step is a pre-welded steel pipe after finish welding production line delivery to internal and external multi-wire submerged arc welding fine.

　　Spiral welded pipe welding two-step pre-finishing production technology Yuan has obvious advantages compared with conventional one-step spiral welded pipe production due to pre-finish welding submerged arc welding speed constraints, the forming and welding separately, an effective solution to the forming and welding problems between mutual interference. full advantage of forming and welding their own characteristics, to achieve a combination of high-speed molding and multi-unit welding, making a molding production line can simultaneously a number of fine welding production line offers to be welded steel pipe, thereby greatly increasing the production efficiency. in addition, since steel forming and submerged arc welding fine separately, on both sides of the pre-weld pipe beveling relatively stable, easy to get high-quality welds.

Analysis of the reason of the wrong side of straight joint steel pipe

　　Straight seam steel pipe production, the wrong side have occurred, many influencing factors. In practice, often by a dry wrong side super differential leaving the steel pipe downgrade. Cause analysis thus produces the wrong side of straight pipe joints and prevention measures are necessary.

　　1, Strip steel camber is caused by the wrong side of the most important factors. In forming the spiral welded pipe, steel 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.

　　2, Due to poor not trimming the strip head and tail shape and size precision, easy to cause docking strip hard bend caused by the wrong side.

　　3, Strip head and tail butt welding weld reinforcement is large, when the over-molding, if not handled properly, likely to cause greater wrong side.

Exotic Advantages Of Spiral Submerged Arc Pipe

　　The spiral submerged arc pipe is divided into three layers from the inside to the outside. The working steel pipe layer is generally made of seamless pipe (gb8163-87) and spiral welded pipe (gb9711-88). According to the planning and customer requirements. SY t5038-92) and straight seam welded pipe (gb3092-93). After the appearance of the steel pipe is advanced by the shot blasting process, the corrosion grade of the steel pipe can reach the level of gb8923-1988 SA2, and the roughness of the surface can reach the specification of gb6060.5-88 R = 12.5 microns.

　　The polyurethane insulation layer is formed by injection molding a rigid polyurethane foam into a cavity between the steel pipe and the outer jacket by a high pressure foaming machine. This is the so-called tube foaming process. Its function is waterproof, the second is insulation, and the third is to support the weight of the heat network. When the medium temperature is: 50 ° C, 120 ° C, a rigid polyurethane foam insulation layer is used. High-density polyethylene protective layer Prefabricated black (yellow) plastic pipe with a certain wall thickness, its function is to protect the mechanical hard disk damage of the polyurethane insulation layer, and the second is anti-corrosion and waterproof.

　　The spiral pipe is used for heating (refrigeration) project, and its heat sealing effect is remarkable. It is directly used for direct burial, which not only saves energy but also reduces dross, and does not occupy the environment and beautify the environment. It is used for oil and gas transportation, can meet the requirements of long-distance transportation, avoid operation and protection, meet the requirements of heat preservation and antifreeze, reduce heating equipment, and is particularly convenient for installation and shorten the construction period.

　　When used for geothermal and hot spring transportation, the cooling requirements can be satisfied and the long loss can be reached. Applicable to water conservancy, mining and other areas, to meet the requirements of cold, antifreeze, anti-corrosion. In addition, the transportation of chemical raw materials has a wide use space. In total, the polyurethane direct insulation pipe has the advantages of energy saving, anti-corrosion, cold, and economical beauty. In addition, it has been widely used throughout the country and is well received by users.

　　Polyurethane insulation pipe adopts polyurethane insulation characteristics: the thermal conductivity is small, and the thermal conductivity of polyurethane foam is the lowest in the insulation data, which can minimize the heat loss of the data. Waterproof, anti-corrosion, high old: Because the closed cell rate of polyurethane foam is over 92%, the use of polyurethane foam as the insulation layer of buried pipeline can not only play the role of thermal insulation, but also can be used to avoid water, moisture, etc. Soaking of various corrosive liquids and gases to prevent microbial growth and development.

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The Common Types of Welded Steel Pipes

　　Welded steel pipe is bent with steel or steel plate is round, square and other shapes and then welded into the surface of the seam with the steel pipe. Common types of welded steel pipe are the following:

　　General pipe, used to transport low-pressure fluid, easy to weld the other soft steel manufacturing. Steel pipe to pipe and thick steel pipe specifications with the nominal mouth of the water pressure, bending, flattening and other experiments, the surface quality has certain requirements, usually the length of the delivery of 4-10m is actually different, the pipe according to the provisions of the wall thickness Two kinds of steel, according to the thread and no thread two.

　　Roller, for belt conveyor roller welding steel pipe, the general water pressure and flattening test.

　　Metric welded pipe, specifications with a seamless tube form, with ordinary carbon steel, high quality carbon steel or Cape can be low-alloy steel tropical, cold belt welding, or with a tropical welding and then made by cold dial method.

　　Spiral welded pipe, is the low carbon carbon steel strip according to a structural steel or low alloy structure of the helix angle (called forming angle) rolled into a tube, and then welded together made of pipe, strip production of large diameter Of the steel pipe. Spiral welded pipe is mainly used for oil and natural gas pipeline, spiral welded pipe with single-sided welding and double-sided welding, welded pipe should ensure that water pressure test, weld tensile strength and cold bending performance to meet the requirements.

　　Metric pipe is divided into ordinary and thin wall, commonly used as structural parts, such as transmission shaft, or conveying fluid, thin wall used to produce furniture, lamps, etc., to ensure the strength of steel and bending test.

Spiral Welded Pipe Production and Use

　　SSAW steel pipe often there will be some quality problems in the production and use, affecting normal use in some aspects, the need for spiral welded pipe to identify the quality, according to a certain way and performance testing, can produce significant in actual use role, then how to identify counterfeit spiral welded pipe method: the appearance often pockmarked face phenomenon. Generally the whole proportionate amount would be better, mainly taking into account the cumulative error and probability theory this problem. Some of the above please add if inadequate, we welcome the discussion of knowledge about aspects of the steel pipe together, advances constantly exchange. Pock is due to badly worn groove spiral welded pipe surface irregularities caused by uneven defects. Because of shoddy spiral welded pipe manufacturers have to pursue profits, rolling groove most often exceeded. The surface is easy to produce scarring.

　　Quality spiral welded pipe of uniform composition. High tonnage cold shear machine, cutting head end surface smooth and tidy, and shoddy materials due to the poor material, cut the first end surface there are often off the meat of the phenomenon that is uneven, and no metallic luster. And because of shoddy materials manufacturers cutting products less head, head and tail will be a big ears. Diameter size fluctuations. Folding is formed on the surface of a variety of spiral welded pipe polyline, this defect is often longitudinally throughout the entire product. Causes folding due to shoddy manufacturers to pursue high efficiency, reduction is too large, resulting in the ears, generated under a rolling folding, the product will crack when folded bending, strength thick spiral welded large decline. Easily scratched.

　　The reason is shoddy material manufacturers poorly equipped, easy to produce burr, scratching the surface of the spiral welded pipe. Depth scratch reduce the intensity of seamless steel pipe. Prone to folding. Transverse ribs thin and low. Often sufficient dissatisfaction with the phenomenon, because manufacturers to achieve large negative tolerance, finished before the reduction of a few relatively large, iron-type small, pass sufficient dissatisfaction. Easy to crack. The reason is that it is blank adobe, adobe many pores, adobe in the cooling process due to thermal stress, cracks, after after rolling there crack.

Distinguish between ERW pipe and spiral welded pipe

    We would like to say that the building’s exterior is beautiful when we see one. Of course, the exterior good look is also concluding the shape of various steel pipes like ERW steel pipe, spiral welded pipe which are used for water, oil and gas transportation.

    No matter which kind of steel pipe you choose for your engineering project. The poor-quality steel pipes would be ousted from the group. So how could we figure out our demands for exact engineering project or estimate houses? Comparison would be one of the top choice for us.

    Straight seam high frequency welded pipe, made by welding and induction, is classified different exposure to welding in two forms, hot and cold rolled. For hot rolled coils as raw materials, with other processes like continuous molding, welding, heat treatment, sizing, straightening, there is no doubt that ERW steel pipe is used for low pressure liquid delivery, such as water, gas, and oil.

    For spiral welded pipe, with the characters of short, high dimensional accuracy, uniform thickness, surface quality, there is no doubt that it can hold on higher pressure than ERW steel pipe. Thus, we can choose the spiral welded pipe for the high pressure engineering project rather than the ERW steel pipe when we meet this situation.

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