What is a convex pipe connection?

Convex odd pipe connection technology, can solve the traditional metal pipe such as: the current common galvanized pipe, stainless steel pipe, galvanized pipe lined with plastic, the metal pipe in the connection is often used to damage the pipe end of the practice that wring teeth or open groove, Because the rib has a certain height and depth requirements, in order to ensure the pipe connection strength and sealing performance, the wall thickness of the production pipe needs to be reserved enough allowance for the processing of the pipe end. As a result, the wall thickness of the pipe is much higher than the actual fluid pressure set size, this part of the increase in wall thickness size called “excess wall thickness.” Due to the existence of traditional metal pipe wall thickness, resulting in a large number of metal pipe material waste, production costs will also increase.

The convex ring (commonly known as reinforcing root) at the end of convex odd tube can increase the radial pressure and radial tension at the tube end. Without considering the case of large external compression force, The wall thickness of the pipe can be directly based on the calculation method of “theoretical wall thickness” plus “reserved wall thickness,” including corrosion resistance, pressure resistance, heat resistance to heating and the processing error of pipe manufacturing, etc. Pipe does not exist excess wall thickness, fundamentally reduce the consumption of metal pipe material.

Convex odd pipe and the pipe fitting form “the tight pressing buckle type” the connection method, abbreviates “the convex odd connection method”, firm sealing is good. The installation tool is light and simple, which makes the installation and connection very fast and convenient, greatly improves the construction work efficiency, and has the advantages of beautiful appearance, durability, light weight, etc.

It has been proved by experiments that the axial tension can bear more than 2000KG and can not pull off the pipe and the pipe fitting when the convex odd pipe and pipe fitting are firmly connected.

Convex odd pipe connection technology, suitable for all metal pipe connection. The international standard “convex odd connection method” is a major innovation and a major breakthrough in the metal pipeline industry. The appearance of this technology will open the prologue of the transformation of metal pipe.

The function of curved double melting Pipe fittings and its difference from other Pipe fittings

Curved elastic double melt pipe fittings are connected by hot melt socket, as long as the special connection pipe skin is peeled off, heated with heating tools, fusion can be done, this kind of pipe fitting is a special pipe fitting of curved elastic vector pipeline system, and this kind of pipe system as a whole is light pipe body steel support. The pressure bearing capacity is as high as PN2.5MPa, which can fully adapt to the challenges of various positions of various buildings. It is the core component to ensure the maintenance-free application of curved elastic vector aluminum alloy lined composite pipeline system.

In the curved elastic vector cold and hot water supply pipeline system:

  1. Improve installation efficiency and control installation quality
    This kind of pipe fitting surface is equipped with hot melt bearing measure positioning mark, when the pipe system installs the pipe and the pipe fitting connection, only needs to refer to the curved elastic double melt pipe fitting surface hot melt socket positioning mark, can mark on the pipeline surface “fusion connection depth fixed”
    Bit Line and socket depth Positioning Line do not need to view the socket depth data and use the ruler tool. The improved installation method of this setting can effectively control the occurrence of fusion quality accidents caused by excessive or insufficient insertion, and make the installation effective.
    The rate has been greatly improved.
  2. Design to ensure fusion quality
    Design of connection structure to prevent “virtual melting” / “leakage” double melting socket. Hot melt bearing plug connection is easy to form welding gap or insufficient melting surface, which is usually called “leakage melting” or “virtual melting”. The fusion quality can not be guaranteed, resulting in hidden danger of pipeline connection quality accident. The engineers and technicians are
    In the structure of special curved elastic double fusion pipe fittings, the designed reverse stacking fusion section can make the interference fluid material produced by axial bearing insertion welding form a reverse stacking fusion section at the socket, and can make the reverse stacking fusion section produced by axial socket fusion.
    The fluid surplus material forms the reverse stacking fusion at the socket port, fills the axial socket weld gap and leakage point interest number, and runs out of the net, which not only ensures the safety of melt strength and forming structure, but also can be thoroughly applied in the aspect of installation quality assurance.
    The bottom eliminates the “leakage” / “virtual melting”, and provides the double melting connection of axial bearing connection and reverse stacking fusion connection to ensure the increase.
  3. The structure design to prevent the pipe from shrinking and clogging caused by fusion accumulation ensures the water flow capacity.
  4. The quality of pipeline connection can avoid the hidden danger of safety in long-term application, and it is the core component to ensure the long-term maintenance-free application of pipeline.
    Curved elastic vector aluminum alloy lined composite pipe is a kind of lightweight rigid pipe because it is outer aluminum alloy and lined with PPR plastic. The application of aluminum alloy and lined food grade PPR plastic can reduce the pressure caused by the weight of the pipe itself, so it can ensure the rigid support of the metal pipe and the earthquake resistance of the elastic pipe fittings. That is to say, compared with the traditional metal pipeline, it is lighter, and at the same time, because of abandoning the traditional metal pipe clasp connection mode, the pipeline can ensure the stability under the condition of fretting.

Different from metal applications:

Because the metal pipeline itself is too heavy, so the construction cost is high, and the traditional clasp connection is also rigid connection, so if encountered minor earthquake and other problems, it is very easy to appear safety risks, resulting in pipeline rupture.
Finally, because the traditional metal pipeline is the metal itself in contact with water, there are a large number of ions in the water, so it is easy to corrode the metal pipeline for a long time. It will not only cause the quality and life of pipeline pressure capacity to decline, but also cause hidden dangers to the sanitation level of drinking water.

Different from the traditional pure plastic pipe application:

The traditional composite pipe is mainly steel lined plastic pipe, although this kind of pipe is lined with food grade plastic, it can effectively increase the service life and hygiene grade of metal pipe. However, because the weight of the steel lined plastic pipeline itself is still relatively heavy, so the connection mode is still the traditional clasp connection, so there are still some hidden dangers in the construction cost and safety.
In addition, there is a kind of aluminum-plastic composite pipe (steady-state pipe). This kind of pipe is three-layer structure outer layer plastic, the middle is aluminum tube, the inner layer is plastic. This kind of pipe has a great improvement compared with pure metal or pure plastic pipe, at the same time, the bearing capacity is much higher than that of ordinary pure plastic pipe, but the diameter of aluminum-plastic composite pipe is very small, which can not be used as the main pipe of building, branch pipe and so on, because the bearing capacity of aluminum-plastic composite pipe itself is not high, at the same time, the bearing capacity is only relatively high relative to pure plastic pipe, but far from reaching the pressure of metal pipe.

What are the classification of socket fittings? What is the difference between the socket pipe and the mouth pipe?

What is a socket fitting?
Socket pipe fittings, mainly divided into high pressure pipe connection fittings are made of round steel or steel ingots molded forging blank, and then machined by lathe forming, And PP resin modified polypropylene low pressure pipe fittings with curved elastic double melting socket connection.
Classification of socket fittings
1, socket pipe series Ann connection form is divided into socket welding connection (SW), welding (BW), thread connection (TRs), bending elastic double fusion socket connection.

  1. Socket pipe fittings are classified according to pressure grade. The pressure grade of pipe fittings is divided into 3000LB (SCH80), 6000L (SCH 160), 9000 (XXS). The pressure level of the pipe fittings with screw connection is divided into 2000LB, 3000LB and 6000L. The nominal pressure of the low pressure pipe fittings is PN2.5MPa.
    3, according to the production of raw materials classification generally have carbon steel socket pipe fittings, stainless steel socket fittings, alloy steel socket pipes, polypropylene PPR socket fittings.
    4, socket pipe fittings classified by use are:
    The pipe fittings used for the mutual connection of pipes are: flange, live joint, pipe hoop, clamp sleeve, throat hoop and so on.
    Pipe fittings to change the direction of the pipe: elbow, bend.
    Changing the diameter of the pipe fittings: reducing diameter (reducing pipe), reducing elbow, branch Taiwan, reinforcing pipe.
    Pipe fittings to increase pipe branch: Tee, Four.
    Pipe fittings for pipeline sealing: gasket, raw material belt, lint.
    The Difference Between Orostomal Tube and Intubation
    1, socket is a pipe inserted into another pipe, and then fixed with cement or glue. Sink pipe in the connection, generally need to seal the rubber ring at the connection. The grooves below the socketed pipe are easier to handle.
    2, the mouth is two water pipes and connect the middle of the sealing ring with Rose fixed. Mouth pipe in the connection, generally need to be put through the connection. Concrete cushion is needed to deal with the grooves below the pipe.
    In fact, the use of socket pipe fittings in our lives is more, such as heating pipe links in a single pipe link to add a tee, is a socket pipe fitting. And we need to change the direction of heating pipes will add an elbow to change direction, this similar application in the rural chimney will also be used. Socket pipe fittings production of raw materials are different, such as stainless steel, alloy steel, etc. Small series of the above from different aspects of the socket pipe fittings were classified, you can do reference.

What Are Pipeline Fittings And Valves?

A pipe fitting is a part that connects a pipe into a line. According to the connection method can be divided into socket pipe fitting, threaded pipe fittings, flange pipe fittings and welded pipe four categories. Made of the same material as the pipe. There are elbow (elbow), flange, three-way pipe, four-way pipe (crosshead) and reducing pipe (size head) and so on. A place where a pipe bends; an elbow. Flange is used to connect pipe to pipe parts, connected to the end of the pipe, tee is used for the place where three pipes meet; A place where four pipes meet; a quad pipe. A place where two pipes of different diameters are connected.
(1) cut-off valve: cut-off valve also known as closed-circuit valve, its role is to connect or cut off the medium in the pipeline. Block valves include gate valves, globe valves, plug valves, ball valves, erfly valves and diaphragm, etc.
(2) check valve: Check valve calls boiler check valve again check valve or check valve, its action is to prevent medium backflow in pipeline. Pump water off the end of the boiler check valve also belongs to the category
(3) mud relief valve: the role of relief valve is to prevent pipeline or device medium pressure in excess of the specified value, so as to achieve the purpose of safety protection.
(4) control valve: Control valve including control valve, throttle valve and pressure reducing valve, its role is to regulate the pressure of the media, such as flow parameters.
(5) shunt valve: shunt valve, including a variety of distribution valves and traps, etc., its role is to distribute, separate or mixed media pipeline.
What are the advantages?
Different pipe fittings are slightly different.
Sheung Shui: If lined with plastic steel pipe, pipe diameter DN100 following wire connection, elbow, tee, four, hoop, on the wire, diameter change, wire plug and so on.
Pipe diameter DN100 or more trench connection, trench elbow, trench three, trench four, trench flange, mechanical three, mechanical four, and so on.
If the words of plastic pipe (PPR water pipe, etc.): hot melt tee, hot melt elbow, direct hot melt, hot-melt variable diameter, directly within the wire, the wire directly, wire elbow, 90, etc.
Water: mechanism of cast iron pipe, then: 45 degrees oblique tee, along the water tee, 45 degrees inclined four-way, with the water Sitong, double 45 degree elbow, 90 degrees elbow, 45-degree bend, are three, four, the riser check port, the level of cleaning pipe, blocking, and so on.
Plastic pipes, such as UPVC drains, Bonding: 45 degrees oblique tee, water three, 45 degrees inclined four, water four, 45 degree elbow, is three, four, riser inspection mouth, horizontal cleaning pipe, plugging and so on.

Advantages and Development of Pipeline Hydrogen Transportation

Hydrogen pipelines can be divided into long distance delivery pipelines and short distance distribution pipelines.
Long-distance pipeline is mainly used for long-distance and large-scale transportation of high-pressure hydrogen between hydrogen production unit and hydrogen station because of its high pressure and large diameter.
The distribution pipeline has low pressure and small diameter, which is mainly used for low and medium pressure hydrogen distribution between hydrogen stations and customers.
The construction cost of hydrogen distribution pipeline is low, but the construction of long distance hydrogen transportation pipeline is difficult and costly. At present, the cost of long distance hydrogen pipeline is about 630,000 USD / km, while the cost for natural gas pipeline is only about 250,000 USD per km, which is about 2.5 times that of natural gas pipelines.
As a way of hydrogen transportation, pipeline transportation has low cost and low energy consumption, which can realize continuous, large-scale and long-distance hydrogen transportation. Hydrogen transportation pipeline has gradually become an important breakthrough for enterprises to solve the problems of hydrogen storage and transportation, and is the inevitable trend of large-scale utilization of hydrogen in the future.
Under large-scale transportation, pipeline transportation has obvious cost advantages. According to the calculation of Guolian Securities, when the transportation distance is 100km, the cost of transporting hydrogen is 1.43 yuan / kg. Under the same transportation distance, the pipeline transportation cost is much lower than high-pressure tube trailer and low temperature liquid hydrogen transportation. Thus, when downstream demand for hydrogen is sufficient to support large-scale hydrogen transportation, transporting hydrogen via pipeline is a reliable way to reduce costs.
Why is hydrogen pipeline transportation developing slowly?
Pipeline transportation of hydrogen is the way to achieve the mass and long distance transport of hydrogen. However, in China, it is not an easy thing to achieve pipeline transportation in hydrogen.
According to the White Paper on Hydrogen Energy and Fuel Cell Industry in China recently released by the China HF Alliance, there are 2,500 kilometers of hydrogen pipelines in the US, 1,569 kilometers in Europe and 100 kilometers in our country.
The total number of hydrogen pipelines in the world is less than 4,500 kilometers, a difference of several order of magnitude compared to oil and gas pipelines. At present, low pressure hydrogen pipeline transportation at home and abroad is still in the initial stage of development.
Cost is a constraint on the development of hydrogen pipelines. Because of its low energy density and easy to produce “hydrogen embrittlement” phenomenon, the pipeline transportation cost of hydrogen is often higher than that of natural gas at the same energy flow rate. Data show that in the United States, the cost of natural gas pipelines is only $125,000 to $500,000 / km, but the cost for hydrogen pipelines is about $300,000 to $1 million / km – twice that.
What is the material of the hydrogen pipe?
Hydrogen is delivered in pipelines made of special materials, such as monel alloy.
Monel alloy has excellent corrosion resistance to reducing media, It has good stability in hydrofluoric acid, alkali, sea water, HS, HSO and HPO, organic acid and many other corrosive media, especially in hydrofluoroacid and alkali solution.
Because hydrogen molecules can get into the lattice of many metals, causing “hydrogen embrittlement,” storage tanks and pipes for hydrogen require special materials and more complex designs.
Hydrogen is not easy to store and transport safely. It is light, elusive, diffuses quickly and needs to liquefy at low temperatures, which can cause valves to clog and create unnecessary pressure.

Troubleshooting of Grooved Pipe Fittings Installation
Common faults and countermeasures

Grooves too wide or too small
Reason: a pressure wheel assembly and pipe size do not match. On the pressure wheel and knurling wheel relative position is not adjusted to the specified value.
Solution: 1. Replace the pressure slot corresponding to the tube wheel. Release sliding fastening bolt, adjust the bolt so that the pressure wheel and knurling wheel on the good slot and seal width value.

Reason: pipe end and pipe center is not perpendicular.
Solution: Fix the end face of the tube.

Excessive groove depth deviation
Reason: The pipe is oval, the pressure speed is uneven.
Solution: the use of circular tubes, uniform pressure speed, each rotation more than a week deep pressure, the thicker the more slowly, gradually.

Pipe port is too large
Reason: a tube offset angle is too large Boluo tube back end too high or too low Left and right deflection serious 4 processing speed
Solution: 1. Adjust the offset angle, the height of the back end and the right and left skewness; 2. Slowly and evenly increase the pressure depth speed

Pipe detaching during machining
Reason: 1. the pipe axis offset is serious; the processing speed is too fast; the active knurling wheel is worn out
Solution: 1. To correct the angle and reduce the processing speed. 3. Brush with steel wire to remove dirt or replace the driving wheel.

Pipe is skidding and not turning
Reason: 1. Speed too fast. Limit is not allowed.
Solution: 1. Slow down and adjust the limit.

End fracture of grooved seal
Reason: 1 on the pressure wheel and knurling wheel do not match. On pressure wheel is not on the knurled wheel slot and pressure slot is too deep.
Solution: 1. Make pressure pulley matching. 2. Adjust the pressure on the wheel is knurling groove control.
Second, the effect of too deep groove on the installation quality

If the groove is too deep, the pipe will appear a relatively large arc, which not only reduces the pressure allowance after the pipe is installed, and is easy to leak, but also easy to get out of the pipe when the pipe has a certain pressure.

If the groove is too deep, the strength of the end of the pipe will be affected, the cracks are easy to appear on the weld, and the zinc layer is easy to be damaged.

If the groove is too deep, the diameter of the bell will increase and the installation quality will be affected.

Grooves too deep easy to cause radial dislocation pipe, prone to leakage.
The influence of shallow grooves on the installation quality

Grooves too shallow will make the pipe card interface gap, medium pressure increases, rubber ring diameter easy to bulge out, affecting the sealing performance. Medium pressure to a certain extent, in the place where the apron drum tear easily cause water leakage accident.

Groove is too shallow, the pipe clamp installed to reduce the tightening margin leakage.

If the groove is too shallow, the clearance between the middle diameter and the outer diameter of the pipe clamp exceeds the permitted range, The outer side of the aprons lip is squeezed into the gap under the action of the medium pressure, which causes the rubber ring to be damaged. In serious cases, the apron will break in the high medium pressure and reduce the sealing performance of the apron.

Originally a flexible joint, because the groove is too shallow, will lose the characteristics of flexible joints, became a rigid joint.

Easy to cause the pipe to fall off.
Three points to ensure the safe use of fire trench pipe fittings

First of all, the time of purchase, the need to buy a variety of products to check whether there are cracks or broken seal;

The connection of various parts should also be checked whether it is tight, the screw nut is matched and the size of the seal ring is appropriate;

A very important point is the fire trench pipe installation, the need to suppress the test, in the process of testing, remember that no one should be close to, such as leakage and pressure instability, need to timely inspection and maintenance.

Principle and performance characteristics of Joint Pipe fittings

Pipe fittings are the general term of components that play the role of connection, control, direction change, shunt, sealing, support and so on in the pipeline system. A pipe fitting is a part that connects a pipe into a pipeline.
It mainly includes the following categories:

  1. The pipe fittings used for pipe connection are flange, live joint, pipe hoop, clamp, jacket, throat hoop and so on.
  2. Pipe fittings that change the direction of the pipe: elbows, bends.
  3. Pipe fittings that change the diameter of the pipe: variable diameter (different diameter pipe), different diameter elbow, branch pipe table, reinforcement pipe.
  4. Increase the pipe fittings of the pipeline branch: three links, four links.
  5. Pipe fittings for pipeline sealing: gasket, raw material belt, wire hemp, flange blind plate, pipe plug, blind plate, seal head, welding plug.
  6. Pipe fittings for pipeline fixation: clasp, drag hook, hanging ring, bracket, bracket, pipe card, etc.

Joint fittings are also called pipe fittings, connectors, joint parts and so on. In all kinds of pipeline systems, the pipe is connected by different joint pipe fittings to form pipe steel.

  1. Malleable cast iron (Ma Steel) pipe fittings are made of malleable cast iron and are connected with pipes by thread (wire buckle). The pressure at work is within 0.1Mpa. Its appearance is characterized by a thick edge at the end. Four-way, used for pipe pass vertical cross connection; different diameter four-way, when connecting two smaller pipe diameters vertically on the pipe; also known as inner and outer filaments, internal and external diameters, small inner filaments, large outer filaments, outer wires connected with other pipe fittings, inner wires connected directly to pipes, used in the variable diameter connection of pipes; outer screw short joints, used to connect two close pipe fittings The pipe short joint made of lathe is commonly used to replace it, and the very short joint is called opposite wire; wire plug, also called plug head, is external thread, which is used to plug the hole of pipe fittings. The live joint is composed of two pipe joints which can buckle each other, the mother mouth and the sleeve mother connecting the common mouth and the mother mouth. The buckle part is lined with rubber pad or asbestos paper pad to avoid leakage, and the live joint is used in the pipeline where the same diameter pipe needs to be connected alive, that is, the pipe can be disassembled without rotating the pipe. In order to facilitate the removal and repair of the equipment in the pipe, in addition, the live joint is also essential in the pipeline installation. Root embellishment, also known as hoop, locking nut, with one end for short silk buckle, the other end for filament buckle (root non-tip degree) short segment and a root mother, plus an inner wall for through wire pipe hoop to form filament, its function with live joint, used as detachable live connection, when used in radiator repair center, wire pipe hoop can also be saved; flange, left and right two pieces to pay, acting as the same live joint. The specification is above the caliber d50mm, because the two ends of the large specification valve are mostly flange interfaces, so the flange is also often used for the connection between the pipe and the valve.
  2. When steel and malleable cast iron pipe fittings are connected by thread, if the working pressure is high (but within 1.6Mpa), steel pipe fittings can be used. Steel pipe fittings are made of carbon steel, commonly known as cooked iron pipe fittings. It has good weldability and can be used in places where welding is needed, such as steel pipe hoops are often connected to steel equipment such as boilers or water tanks.
  3. The feed iron pipe fittings are made of gray cast iron. There are two kinds of water supply cast iron pipe fittings, which are socket type and flange type. Their use is similar to that of malleable cast pipe. There are the following types: cross pipe, T tube (including three bearing cross pipe, three plate cross pipe, four bearing cross pipe, four plate cross pipe, double bearing tube, double disk tube, three bearing pipe, three plate tube, double bearing single disk tube, single bearing double disk tube). 90 °bend, 45 °bend; fork pipe; B pipe; hydrant pipe; casing and so on.
  4. The main drainage cast iron pipe fittings are socket bending pipe, 90 °elbow, 45 °Y-shaped three-way, 90 °T-shaped three-way, 90 °TY three-way, oblique four-way, positive four-way, TY-shaped special-diameter three-way, different diameter four-way, pipe hoop, T-shaped bottle mouth three-way, 45 °elbow, Y-shaped special diameter three-way, socket cleaning port, S-shaped water storage bending, P-shaped storage bending, floor leakage and so on. Note: a variety of different joint pipe fittings can be made of different materials. At present, plastic joint pipe fittings have been widely used, because only with different materials, it will not be repeated here.

What is galvanized steel pipe?

Galvanized steel pipe is divided into cold galvanized pipe, hot galvanized pipe. Cold galvanized pipe has been banned, hot galvanized pipe is also the country to promote temporary use. Galvanized steel pipe surface with hot dip plating or galvanizing layer of welded steel pipe. Galvanized steel pipe can increase corrosion resistance and prolong service life. Sixties and seventies, the international developed countries began to develop new pipe, and have banned galvanized pipe. China’s Ministry of Construction and other four ministries also issued a clear document from 2000 onwards banned galvanized pipe as a water supply pipe, the current new district cold water pipe has rarely used galvanized pipe, some district hot water pipe is galvanized pipe.
Often said galvanized pipe is now mainly used for gas transmission, heating. Galvanized pipe as a water pipe, use a few years later, a large number of rust inside the pipe, the yellow water flowing out not only pollute sanitary ware, but also mixed with the non-smooth inner wall of bacteria; The high content of heavy metals in water caused by rust is harmful to human health.
As the name implies, cold galvanized pipe is through the method of galvanizing, the outer wall of the steel pipe is coated with a layer of zinc. This treatment method is completely different from the principle of hot galvanization, so we call it cold galvanizing pipe. It is precisely because this method does not change the chemical composition of the steel pipe surface so the stability of the zinc coating is not high.
Difference between galvanized pipe and hot-dip galvanized pipe:
1, the process is different, a chemical treatment, a physical treatment; Hot-dip galvanizing coating is firm and not easy to fall off
2, hot galvanizing coating thick, so strong corrosion resistance. And galvanized (electroplating) coating uniform, surface quality is better, the coating thickness is generally between a few microns to ten microns.
3, hot-dip galvanizing is a chemical treatment, belongs to the electrochemical reaction. Galvanization is a physical treatment, just brush a layer of zinc on the surface, there is no galvanization, so the zinc layer is easy to fall off. Hot-dip galvanizing is used in construction.
4, hot-dip galvanized pipe is to make molten metal and iron matrix reaction to produce alloy layer, so that the substrate and the coating combined.
What should be noticed in the welding of galvanized pipe?

  1. Galvanized steel pipe with diameter greater than 100mm should be connected by flange or special pipe fittings.
    2, galvanized steel pipe and flange welding, in order to ensure the welding quality, should be the welding mouth galvanized treatment, the application of hand grinding wheel or sand paper to clean the galvanized layer, or gas welding flame to clear the zinc layer.
    3, galvanized steel pipe and flange welding should be galvanized twice.
    Measures to ensure welding quality include:
    1, the human factor is the focus of gas galvanized pipe welding control. Due to lack of necessary post-weld control hand
    Section, easy to jerry-building, affecting quality; At the same time, the welding particularity of galvanized pipe makes it difficult to ensure the welding quality. Therefore, skilled welders who hold the appropriate boiler pressure vessel or equivalent welder’s certificate should be selected prior to the commencement of work. Carry out the necessary technical training and disclosure, refer to the boiler pressure vessel welder examination rules for on-site examination and approval, give the permission to enter the site welding. And shall not be replaced at will, to ensure the welding of the pipeline welders relatively stable.
    2, welding material control: to ensure that the procurement of welding materials is the normal channel, there is a warranty, certificate, meet the process requirements; Welding material acceptance, lead material formalities to formal and complete, electrode head recovery control strict, to ensure the flow direction, dosage; Welding materials should be strictly baked according to the process, and not more than half a day of supply.
    3, welding machine; Welding machine is welding machine, must ensure reliable performance, meet the process needs; Welding machine must have qualified current, voltage meter, to ensure the correct implementation of welding technology. Welding cable can not be too long, long to adjust the welding parameters.
    4, welding process method: ensure the strict implementation of special operation methods of galvanized pipe, according to the welding process before welding groove inspection, welding technology parameters, operation method control, after welding appearance quality inspection, when necessary, add after welding non-destructive testing. Control welding level, welding material consumption of each crossing.
    5, welding environment control: to ensure the welding temperature, humidity, wind speed in line with the process requirements. Welding shall not be performed unconditionally.

Moldable Iron Pipe Fittings 150

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Whether you’re searching for elbows, plugs, covers, areolas, naming however various, BES could have the pliant iron fittings you really want. Dark iron line is used in private purposes to move unadulterated gas and propane gas. Dark metal line is produced to be consistent, which makes it a superior sort for normal fuel transportation and hearth sprinklers. Since it gives preferable security from hearth over aroused pipe, it is the best kind for fuel transportation and chimney sprinkler methods. Outrageous strain strung fittings get together with exorbitant tension (3001+ psi) pipe. It is extremely normal today to place in bendable iron lines in polyethylene sleeves.

This dimensionless amount assigns the strain temperature positioning. If it’s not too much trouble, note that we’re not stockist and the clarification we’re not stockist is because of it isn’t savvy. We are without a moment to spare supplier of Ductile Iron Pipe Fittings/Ductile Iron Fitting/DI Fittings. Least request sum is one holder so we will create it at Truform India and give it to your final location in UK or Europe. Bendable Iron Pipes and Fittings circulation is an extravagant errand with our capacity to import from Truform India and convey to your doorsteps in what we do as a discount supplier.

You can now get section to free items out of your number one makers on Miter 10. Plumbfix is an exchange just supplier committed to meeting the needs of the pipes and warming specialist. Our display areas show the latest styles in kitchen, bath and lighting plan from industry pioneers. Your message has been despatched to the accompanying providers. Stringently control the type of the string, parallelism, Angle, tooth sort, each stay over a fitting measure for testing. We use spectrometer from Oxford Instruments to confirm the material’s quality.

Wholesaler of steel outlining techniques, wellbeing grinding stock and link plate stock. Fittings incorporate course and link, pipe, railing, and cylinder. Materials incorporate steel, chrome steel, aluminum, fiberglass, powder gets done, coatings, epoxy gets done, zinc plate gets done and electrifies wraps up. Applications embrace road pointers, roof walkways, mezzanines, catwalks, subfloors and different capacities.

Maker of acrylonitrile butadiene styrene , aluminum, cast iron, erosion safe, malleable iron, metal, nickel and nickel compound and hardened steel pipe fittings along with elbows. Elbows pass on through redirection, not by material effect, killing elbow wear, stopping, flooding and item debasement. Configurable for explicit modern capacities, possible in 45 and 90 certificate elbows in tube dia.

The last expense might be very surprising depending on the conveyance handle. Dark line is sturdy, ideal for dry, indoor capacities. Rough Enough To Last A Lifetime Our Kanaif Stainless steel is almost indestructible, with innate long-life properties that don’t decrease over the long run or rehashed use. For requests about our product or pricelist, kindly withdraw your email to us and we will be in contact in 24 hours or less. We give a wide range of Malleable Iron Pipe Fittings.

Dark iron line might be welded utilizing any welding method utilized for metal. This incorporates MIG, transition cored, TIG and anode bend welding. Nonetheless, dark line fittings are produced from pliable dark iron. Dark iron fittings are hard to weld with out really hurting the fittings. We give the best scope of hot aroused pliant iron line fittings which have been demonstrated to be to the best on the lookout. These are created with high grade of metallic uncooked materials.

Difference between Hot Galvanized Steel Pipe and Cold Galvanized

  1. Hot-dip galvanized pipe:
    Hot-dip galvanizing tube is to make the iron base and molten metal react to form alloy layer, so that the base and the coating bond. Hot-dip galvanizing requires pickling to remove iron oxide from the surface of the steel pipe. After pickling, it is washed in aqueous zinc chloride solution or ammonium chloride or mixed aqueous solution of ammonium chloride and zinc chloride, and then fed into a hot dip plating bath. Hot-dip galvanizing has the advantages of strong adhesion, uniform coating and long service life.
  2. Cold galvanized pipe:
    Cold galvanizing is what we call zinc plating. The amount of galvanization is very small, and the corrosion resistance of the cold galvanized pipe is very different from the hot galvanized pipe, so many construction projects do not use the cold coated pipe. At present, the Ministry of Construction has officially declared that the backward technology of cold galvanizing pipe needs to be eliminated, and the cold galvanized pipe is not allowed to be used as a water gas pipeline in the future.
    Applications of galvanized steel pipe:
    Hot-dip galvanized steel pipe is widely used in construction, machinery, coal mine, chemical, electric power, railway vehicles, automobile industry, highways, bridges, containers, sports facilities, agricultural machinery, petroleum machinery, survey machinery and other manufacturing. Welded steel pipe with hot-dip or electroplated zinc coating on the surface of galvanized steel pipe. Zinc plating can improve corrosion resistance of steel pipe and prolong its service life.
    Galvanized pipes are widely used, not only as pipelines for transporting water, gas, oil and other general low-pressure fluids, but also as oil well pipes and oil pipelines in the petroleum industry, Especially in the submarine oil field, the oil heater, the condensation cooler, the chemical coking equipment in the coal distillate wash oil exchange pipeline, the trestle pipe pile and the mine laneway support frame pipeline and so on.
    Therefore, in the choice of galvanized steel pipe, we should focus on quality, choose high quality, high price galvanizing steel pipe. The choice of pipeline has a great impact on the quality and safety of construction projects.
    Hot-dip galvanized steel pipe: hot-dip galvanizing steel pipe is first steel parts for pickling, in order to remove iron oxide on the surface of steel parts, After pickling, it is cleaned in a bath of ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium and zinc chloride, and then fed into a hot dipping bath. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.
    Cold galvanizing steel pipe: Although now cold galvanized steel pipe has rarely been used on a large scale but since we tell the difference nature will also introduce under, Cold galvanizing is also called electroplating zinc, is the use of electrolysis equipment will be the pipe after oil, pickling into the composition of zinc salt solution, The anode of the electrolytic equipment is connected, and a zinc plate is placed on the opposite side of the tube. The positive electrode connected to the electrolytic device is connected with the power supply. The directional movement of current from the positive to the negative electrode can deposit a layer of zinc on the tube. The cold plating tube is processed first and galvanized later.
    To talk about the differences, we have to talk in several ways.
  3. Different from the construction process: hot-dip galvanized steel pipe is to make molten metal and iron matrix reaction to produce alloy layer, so that the base and coating combined with the two and cold galvanized steel pipes are cold galvanized coating mainly through the electrochemical principle to anti-corrosion.
  4. Different equipments required: pickling equipment, bottom withdrawal annealing furnace or hood annealing furnace. Cold galvanized steel pipe: electrolysis equipment.
  5. Different performance: durable corrosion resistance, standard quality of hot dip galvanizing thickness makes it has excellent durability; The toughness of the coating is strong, hot dip galvanizing layer forms a unique smelting metal structure, this metal structure can withstand the transport and use of mechanical damage. Cold galvanizing: excellent environmental performance. Most solvents and diluents for cold galvanizing do not contain toxic organic solvents. Moreover, the evaporation of organic solvents is reduced, energy consumption is reduced and the process is beneficial to environmental protection.
  6. Zinc coating thickness is different thickness: hot-dip galvanized steel tube zinc layer itself is relatively thick, there is more than 10 um thickness, although the surface is bright, but rough, there will be zinc flowers. And galvanized (cold galvanized steel pipe) zinc layer is very thin, as long as the thickness of 3-5um, although the surface is smooth, but there will be dark, dirty performance, good processing performance, lack of corrosion resistance.
  7. Different applications: hot-dip galvanized steel pipe due to good corrosion resistance, Hot-dip galvanized steel pipe is widely used in power tower, communication tower, railway, highway protection, lamppost, marine components, building steel structural components, auxiliary facilities of substation, light industry and so on. Cold galvanized steel pipe is the main development direction of environmental protection of heavy corrosion protection coatings.