Category: pipe fitting Knowledge

The so-called pipe fittings are those parts that can connect the pipes into lines, and because different pipe fittings are connected in different ways, they are called different, and can be divided into four kinds of flange fittings, socket fittings/welding fittings and threaded fittings. Sometimes we have also been connected to the number of pipes to distinguish the pipe fittings, there are elbow pipe, three-headed pipe, four-way pipe and reducer pipe. There are many manufacturers of pipe fittings in China, and I have compiled some information of pipe fittings manufacturers here.

China is the world’s producer of construction materials, but also the largest consumer of construction materials. The main building materials products produced in China are flat glass, cement, wall materials and stone, while the annual output of these products are the first in the world. Because of the continuous improvement of technology, the quality of building materials products, but also for the energy consumption and use of raw materials is now declining. In this new era where various building materials are appearing and the original building materials are being upgraded, there are some large building materials manufacturing bases in China, and Cangzhou is one of them.
The production technology of pipeline equipment manufacturing industry in Cangzhou is very advanced. At present, there are more than 3,000 formal production enterprises, 222 with sales revenue of more than five million, and more than 120,000 staffs are engaged in pipeline manufacturing industry in Cangzhou.

The manufacturing process of pipeline manufacturing in Cangzhou is generally mainly using hot-rolled straight seam welding and spiral double-sided submerged arc welding, through forging, medium frequency pushing, forging and cold forming. The maximum processing diameter of most of the water pipes is two thousand and two millimeters. These building materials products are very widely used in municipalities and petrochemicals. Currently Cangzhou pipeline manufacturing industry is moving towards a new goal. The future goal is such that they want to vigorously supervise the pipeline equipment manufacturing capacity of thirty million tons. In the next few years, Cangzhou may become a famous “pipeline equipment manufacturing and R&D base” and “pipeline equipment capital” at home and abroad. China’s “Eleventh Five-Year Plan” infrastructure investment has now reached the middle plate, China’s highways and railroads will enter a stable growth, because of the above circumstances, so that China’s construction industry is in the boom upward phase. In this background of advocating the construction of energy saving and emission reduction, Cangzhou pipeline manufacturing industry came into being.

Internationally there are two different systems for pipeline standards, namely the European pipeline system, mainly represented by Germany and the former Soviet Union, and the American pipeline system, represented by the United States.
Through the reading of this article, do you have a certain understanding of the pipe manufacturing industry.

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.

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 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.

2. 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.

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.

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.