Composite Insulation Steel Pipe

Spiral welded steel pipe is a steel strip coil plate of raw materials, often warm extrusion molding, with automatic double wire welding double-sided submerged arc welding technology with spiral seam pipe. Thermal insulation pipe refers to after processing the heat preservation technology, in different working conditions and medium to ensure work steel pipe under the action of outside temperature and surface temperature meet or meet the use requirements of steel pipe.

Steel  composite insulation steel pipe is one of the underground buried pipes, with the absence of concrete structures can also be buried underground, the work carbon steel pipe thermal expansion of the outer tube, reducing the cost of materials, shorten the construction date, and to ensure the safety of the heating pipe, can be in different temperature environment safer is widely used, especially suitable for high temperature steam pipeline project. The temperature can reach 150 ℃ to 450 ℃. Three layer PE pipe port generally choose polyethylene film or cold wind belt sealing, prevent before installation or construction into the moisture or water. Heat preservation material multi-layer emperical bandage, effectively reduce the heat loss, at the same time adopt measures to control the coat surface, prevent cold bridge, so that the coat anticorrosive layer are obtained by temperature control. Bandaging with heat preservation material layers of aluminum foil reflector, effectively reduce the heat loss, make steam pipeline more economic and reasonable. Hydrophobic system adopt totally closed form, flexible layout, reasonable structure, safe and reliable. Moisture removal on the coating steel pipe can both wet gas generated in time, and can be used as daily operation of the alarm signal pipe. Pipeline thermal compensation using high-quality bellows compensator, and should be installed to the casing, make form of directly buried, do not need to set up the observation well, convenient operation, short construction period. 2.5 MPa, below 350 degrees Celsius is suitable for conveying steam or other medium, this product is made from steel tube outer protective layer, has high strength, not easy to damage, maintenance is simple construction, long service life.

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Thick Wall Steel Pipe

Thick wall straight seam steel pipe, steel pipe diameter and wall thickness is less than 20 carbon steel pipe called a thick wall steel pipe. Geological drill pipe is mainly used for oil, oil chemical industry with the cracking of pipe, boiler tube, bearing and automobile, tractor, aviation with high precision tube structure, etc. Thick wall straight seam steel pipe according to the production process can be divided into high frequency straight seam submerged arc weld steel pipe and straight seam steel pipe. Submerged arc welding and straight seam steel pipe according to the different forming methods is divided into UOE, RBE, JCOE LSAW steel pipe, etc. Among them, according to various USES and different production working procedure, after. (can be roughly divided into the scaffold tube, fluid pipe, wire casing, stent tube, guardrail tube etc.)

Forging steel: use the reciprocating impact or press pressure forging hammer to make blank as we need to change shape and size of a pressure processing method.

Extrusion: steel metal is placed within the closed extrusion Jane, pressure on the side, make the metal from rules of extrusion die and have same shape and size of the finished product processing method, used in the production of non-ferrous metal material products.

Rolling: steel metal blank through a pair of rotating roll gap (shape), due to the compression of roll reduce material section, the length of the increase of pressure processing method.

Drawn steel: it is already rolling metal blank (type, tube, products, etc.) through the die drawn into section reduced length increased processing methods are mostly used in cold working.

Straight seam steel pipe domestic commonly used material is Q235A, Q235B, 0 cr13, 1 cr17 cr18ni11nb, 00 cr18ni9 cr19ni11, 1, 0, 16 mn, 20 #, Q345, L245, L290, X42, X46, X70 and X80.

Straight seam steel pipe in China is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For liquid transportation, water supply and drainage. For gas, gas, steam, liquefied petroleum gas. For structure: piling pipe, bridge; Dock, road, building structural steel pipe, etc.

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Comprehensive History of Pipe Rack

In developed countries, 2 PE anti-corrosion coating steel pipe joint gap has existed for more than a century, at the same time of 2 PE anticorrosive system gradually perfect its scale has increasing trend.

As early as in 1833, Paris in order to solve the problem of 2 PE anti-corrosion steel pipe laying of underground pipeline and improve the quality of environment, started building 2 PE underground pipeline ditch together. So far, Paris 2 PE anticorrosive about 100 kilometers, the total length of steel tube has been built for 2 PE common ditch network system more perfect.

Since then, Britain's European cities such as London and Hamburg in Germany and the construction of 2 PE anticorrosive underground common ditch.

In 1926, Japan began to build 2 PE anti-corrosion steel pipe underground common ditch, by 1992, Japan already has 2 PE anti-corrosion steel pipe joint gap length about 310 kilometers, and the quantity in the process of growing.

In 1933, the Soviet union in Moscow, Leningrad and Kiev built two PE anti-corrosion steel pipe underground common ditch.

1953 in Madrid, Spain to build 2 PE anti-corrosion steel pipe under the common ditch. Also like Stockholm, Barcelona, New York, Toronto, Montreal, Lyon and Oslo city, have the more complete 2 PE anti-corrosion coating steel pipe underground common ditch system.

China

So far only China such as Beijing, Shanghai, shenzhen, suzhou, shenyang a few city has a comprehensive utility tunnel, according to incomplete statistics, about 800 km, the national construction mileage composite pipe gallery to the cause of the large area to promote is not money, is not a technology problem, but the consciousness, legal and conflicts of interest.

Comprehensive utility tunnel construction one-time investment is often higher than the cost of pipeline laying independent. According to statistics, Japan, Taipei, Shanghai composite pipe gallery of average cost (in yuan terms) respectively is 500000 yuan/m, 130000 yuan and 100000 yuan/m/m, is far more than the ordinary way of pipeline. But comprehensive save out the path of underground space, every time the excavation cost, the impact on the traffic efficiency and destruction of the environment, the comprehensive pipe gallery cost-benefit ratio obviously can not only look at how much. Taiwan had to Lutheran line 6.5 km measure have been carried out comprehensive utility tunnel as an example, built the comprehensive utility tunnel than not to build five hundred million new Taiwan dollars investment, but 75 years later, the benefit is nt $233.7 billion.

On tiananmen square in Beijing as early as 1958 laid under more than 1000 meters of composite mild steel pipe gallery. In zhongguancun west end in 2006 built in mainland China the second modern comprehensive pipe gallery. The comprehensive utility tunnel line 2 km long, feeder 1 km long, including water, electricity, cold, heat, gas, telecommunications and other municipal pipeline. Mainland in 1994, the Shanghai government planning and construction of the first article of the largest and longest composite pipe gallery - regularity of pudong new area comprehensive pipe gallery. The comprehensive utility tunnel, 11.125 km for the water supply, electric power, information and four cities such as gas pipeline. At present, Shanghai has built the songjiang new city demonstration underground comprehensive utility tunnel project (phase I) and "one ring and one line" of about 6 km anting new town of jiading district of composite pipe rack system. Joint development of China and Singapore suzhou industrial park infrastructure construction, after 10 years of development, the underground structural steel pipe corridor has also begun to take shape.

Common Anticorrosive Measures of Steel Pipe

In recent years, oil, natural gas, chemical industry, water supply, fire protection and other industries to develop faster and faster, the number of old pipeline corrosion has been broken is bigger and bigger, to enhance the service life of carbon steel pipe, reduce waste, and all walks of life is also more and more high to the requirement of anti-corrosion.

First: oil, natural gas, chemical and other industries to the requirement of anti-corrosion

These industries transfer objects are for pipeline corrosion is very big, so is the highest to the requirement of anti-corrosion, anti-corrosion are often used in these industries form for 3 PE anticorrosion, epoxy resin, epoxy coal tar anti-corrosion and other forms.

1, 3 PE anticorrosive coating steel pipe mainly have three layer structure, three layer structure, respectively 100 epoxy powder, 170 ~ 250 um um adhesives and 2.5 ~ 3.7 mm PE layer, the anti-corrosion structure is the corrosion form one of the best forms of plastic coated. Common style for the following.

2, epoxy resin anticorrosion is the outer layer of the pipeline in epoxy resin coated. Common style for the following.

3, epoxy coal tar anti-corrosion common there is a cloth two oil, three cloth two oil, oil five step three, four oil seven cloth.

The second: the inner wall of water supply industry in corrosion protection

Drinking water in direct contact with the people's living industry, so for anti-corrosion chemical requirements have to be very high, the most important must ensure that non-toxic.

1, ipn8710 water pipeline anticorrosion coating steel pipe not only effect is good, and non-toxic.

2, cement mortar corrosion is the corrosion in the inner wall of the pipeline water cement.

Always, the anti-corrosion in the form of different applications in a wide range of industries are also different, this must be done according to the requirement of the user to determine.

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SEBF Anticorrosion Coating Steel Pipe

The characteristics of the SEBF anticorrosion coating steel pipe

(1) the wear-resisting performance is good (5 times higher than the cast iron wear resistance and coating wear-resisting performance is three times higher than normal), and has the very high shear strength, the high pressure, high speed gas and liquid delivery, coating from a long time

Damage.

(2) high impact resistance strength, impact strength is greater than 23 j, when subjected to the impact of the 18 j, coating no delaminating, crack, damage, affordable coating in the process of installation and operation.

(3) strong adhesion, excellent and binding force of matrix, and the bonding strength of 110 mpa.

(4) the good chemical stability, resistance to oil, acid, alkali resistance, salt resistance, corrosion resistance to sea water.

(5) coating and thermal expansion coefficient of structural steel pipe is very similar, good cold resistance.

(6) coating surface is smooth, dense, small resistance, can make the roughness of the workpiece at 2.5 microns, and quickly improve the transmission efficiency is about 2%.

(7) the good temperature range, 0 ℃ ~ 100 ℃ in water, air and 40 ℃ ~ 150 ℃, the service life is long, cost performance is better than rubber lining plastic lining.

(8) machining performance is good, can be car, planing, grinding, milling and other processing, meet the requirements of accuracy, coating easy to fix.

Non-toxic, tasteless, no pollution, 

(9) coating process is simple, save energy and resources.

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FBE Coating

Sinter type epoxy (FBE) because of its excellent performance for a long time, has been as a single or double system independent of coating and multi-layer system of primer has been applied for more than 40 years, therefore become the standard of global pipeline anticorrosion coating material. Over the past decade, the oil and gas exploration through evolution and transport industry, the industry also constantly trying to delay the strategic and valuable assets such as pipeline corrosion, thus stimulating the new type fusion bonded epoxy (FBE) the development of anti-corrosion coatings. Sinter type epoxy (FBE) formula using solid epoxy resin; Under the condition of the proper proportion of solid epoxy resin, can make the FBE coating to achieve higher performance requirements, so as to cope with more severe challenge in the field use. Dow coating materials division (DCM) has been cooperating with customers and the industry organization, for high performance type fusion bonded epoxy (FBE) coatings development low cost solution. Dow coating materials are introduced in this group successfully developed and some solutions to the market.

For high glassy state transformation temperature FBE coating steel pipe special resin

Offshore oil and gas reservoirs in the harshest place on earth environment, because the new depth of oil reservoir were found from year to year, so more frequently to mining offshore oil and gas reservoirs. The interior department mineral service values, deep reservoirs may contain 50 billion barrels of oil in the gulf of Mexico, according to the current consumption of speed, the energy consumption of the equivalent of 7.5 years. On the depth of the ocean to put forward many drilling technology and material performance challenges. This perspective, from the most challenging thing is met high temperature - in general, the deeper the reservoir, oil or gas is more hot. From deep oil and gas reservoirs, by using the set of more than 140 ° C temperature oil (gas) pipeline from well be transported to the tension leg platform or single-column platform. Ordinary FBE coating cannot bear water, high pressure and high temperature work together for a long time. Only maintain a high working temperature, to avoid the formation of gas hydrate. For the pipeline, to avoid light paraffin condensation; Light paraffin condensation will restrict or hinder the flow of oil. Pipe coating enterprise by developing the advanced multilayer system, to maintain a high temperature; Multi-layer system not only make the pipe from corrosion, but also have the effect of thermal insulation layer, the pipeline is not affected by deep sea water or cold in the winter air temperature. This design is used to deal with extreme conditions of pipeline is called flow-through pipeline. For high temperature pipeline corrosion protection, the FBE coating of glass transition temperature (Tg) must be at least 5 ° C higher than the highest design temperature of pipe. In addition, FBE coating need to have enough flexibility, in order to avoid the use of pipe bending, coating fracture. Higher glass transition temperature (Tg) and good flexibility, the two features in conventional epoxy resin systems are often contradictory, that is, the higher the glass transition temperature (Tg), the flexibility of the coating is more poor. High glass transition temperature (Tg) is usually done by increase the crosslink density of polymer; Increase the crosslink density of polymer, will often reduce the flexibility of the coating. As a result, the challenges faced by our development team, in does not affect other key performance (for example: the storage stability and processability of FBE powder coating), break glass transition temperature (Tg) and reciprocal relationship between flexibility. In addition, after curing FBE coating steel pipe need to pass the appropriate thermal aging, to maintain its integrity in pipeline life period.

Pipe coating industries use most of the high glass transition temperature (Tg) coating systems, all need to use conventional spray or airless technology, painted for liquid; In addition, still must be high temperature curing, often need to coating layers, in order to achieve the predetermined thickness. This method is time consuming, and the coating is often a lack of flexibility. In view of these reasons, the conventional high glass transition temperature (Tg) coating is mainly used for coating of drilling pipe, injection pipe or shape relatively complex widgets (for example, fittings, flanges, valves, etc.). Polymer glass transition temperature (Tg) will be affected by the following several ways: improve crosslink density; Change the chain rigidity or molecular inter-atomic forces. The three variables (chain flexibility, molecular inter-atomic forces, crosslinking density) can be adjusted, so as to achieve the required balance between each performance. In order to speed up for high glass transition temperature (Tg) FBE the development of a new type of resin, we adopted patent a computer model to control the three variables, thus rapid screening of large amounts of structure. This kind of model considering factors include chain flexibility, molecular inter-atomic forces, and crosslink density. Conventional solid oligomer with glycerol ether bond, which has the inherent flexibility. Therefore, we use more rigid structures instead of solid glycerine ether bond of oligomer, rather than using substituent on the benzene ring.

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How to Weld a Steel Pipe and clean its Resin

Welding API steel pipe varies greatly depending on the style and type of steel. According to the delta school of trades, certain API carbon steel pipe require special preheating and cooling to ensure cracking does not occur during welding or cool down. Most welders use TIG or MIG welding tools. You should know that on-line welding source muggy welds that making use of a common hand-used propane torch for metal welding. Welding rods and soldiers, elements employed to connection throughout welding, melt at differing temperatures and element styles for a range of metal welding work.

Use API steel pipe
1. Make positive welding goggles include your eye balls throughout the melting procedure to safeguard them from vibrant mild.
2. Heat the metal pipe ends to be welded. Melt the welding rod into the joint of the metal pipe. 
3. Or soldier the welding rod into the joint of the metal pipe making use of a propane torch.
4. Make positive the melted welding rod or soldier joint includes the whole surface area of the mild steel pipe joint.
5. Permit the welded joint and metal pipe to awesome.
6. Analyze the potency of the joint by applying stress to the pipe close to the weld.

Use API steel pipe are one of several varieties of pipes created to smoke tobacco in all tobaccos have numerous aromas and all numerous varieties of resins. Resin is the gooey tar-like substance left in the pipe soon after cigarette smoking a bowl of tobacco. It can differ in color from dark to brown, and when it hardens on the surface area, it can be tough to get rid of. You'll require some fundamental residence elements to clean up the resin out of your metal pipe, and you might require buying some points, but all in all, it is not incredibly pricey to clean up your metal pipe. Place on the rubber gloves and disassemble the pipe. Pour the good-grained sea salt into the metal pipe stem and bowl compartment. The salt functions as a scouring agent. Pour a generous quantity of rubbing booze into the finale material sandwich bag. Make positive it is sufficient to submerge the pipe, and put the pipe into the bag. The rubbing booze will start to loosen the resin that is within the pipe. Shake the bag vigorously for 3 to 5 minutes, pour out the option and rinse the metal pipe in warm drinking water. Repeat actions 2 to 4 two far more occasions to get rid of most of the resin in your welded steel pipe.

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