Grooved pipe joint technology, also known as clamp connection technology, has become the first technology for the connection of liquid and gas pipelines. Although this technology is developed later in China, due to its advanced technology, it is quickly adopted domestically. Received by the market. From the development in 1998 to the present, after a few years of development and application, it has gradually replaced the two traditional pipe connections of flange and welding. Not only is the technology more mature, the market is generally recognized, and it has been actively guided by national laws and regulations.
The application of the grooved pipe joint technology makes the complicated pipe connection process simple, fast and convenient. Make pipe connection technology a big step forward. As a new type of pipe connection technology, the grooved pipe connection has obvious advantages of convenient construction and reliable quality.
First, the advantages of grooved pipe joints
1, simple operation
The connection of the grooved pipe fittings is very simple and requires no special expertise. The ordinary workers can be operated with simple training. This is because the product has a large number of fine technical parts dissolved into the finished product in a factory manner. A pipe connection takes only a few minutes, which simplifies the technical difficulty of on-site operation and saves man-hours, thus stabilizing the project quality and improving work efficiency. This is also the overall direction of the development of installation technology.
The traditional welding and flanged pipe connection methods not only require welding workers with corresponding skills, but also time-consuming, the operation of the workers is difficult, and there is pollution of welding fume. Due to the difference in operating space and welding skills, it is difficult to achieve satisfactory results in terms of welding quality and appearance, thus affecting the overall quality of the project.
In addition, since the grooved pipe fitting is a finished product, the required operation space on the spot is small, and the installation can be truly achieved by the wall angle, and the operation difficulty is greatly reduced, thereby saving the floor space and beautifying the effect of the pipe installation.
2. The original characteristics of the pipeline are not affected.
The grooved pipe joint is connected, and only one groove is extruded by the rolling machine on the outer surface of the pipe to be connected without damaging the inner wall structure of the pipe, which is a technical advantage unique to the grooved pipe connection. If a conventional welding operation is used, many of the pipes whose inner walls have been treated with corrosion protection will be destroyed. Therefore, the specification stipulates that galvanized pipes, plastic-lined steel pipes, steel-plastic composite pipes, etc. shall not be welded or flanged, otherwise secondary treatment is required.
3. Conducive to construction safety
With the grooved pipe connection technology, only the cutting machine, the rolling groove machine and the button bolts are needed for the site, and the construction organization is convenient. The use of welding and flange connection requires complex power cables, cutting tools, welding machines, and oxygen and acetylene cylinders, which brings complexity to the construction organization, and there are also potential hazards of leakage and fire. . At the same time, the welding slag generated by welding and gas cutting will inevitably fall into the inside of the pipeline. It is easy to produce pipeline valve parts or even equipment blockage during use, and also pollute the water quality inside the pipeline.
In addition, welding and flange connection inevitably require long-term high-intensity aerial work, and production safety accidents are also prone to occur.
4, the system is stable, easy to maintain
The grooved pipe connection has a unique flexibility, which makes the pipe resistant to vibration, shrinkage and expansion. Compared with welding and flange connection, the stability of the piping system is increased, which is more suitable for temperature changes, thus protecting The pipe valve parts also reduce the damage of the structural stress caused by the pipe stress.
Due to the simple operation of the grooved pipe connection, the required operating space is reduced, which brings many convenient conditions for future maintenance. When the pipeline needs to be repaired and replaced, just loosen the two clamps to replace, rotate, and modify a section of the pipeline. No need to damage the surrounding walls, reducing maintenance time and maintenance costs.
5. Economic analysis
Because the grooved pipe joint connection operation is simple, labor saving and time saving, it has good economic benefits. Many articles have done economic analysis, saying that "the use of clamp connection, although the price of a single accessory of the clamp is higher, but the overall efficiency of the installation of the entire pipe network is higher than the flange connection."
Second, the connection method of the grooved pipe fittings
A, the connection of the grooved pipe fittings
1, clamp installation
(1) Install the sealing ring: put the sealing ring into one end of the pipe mouth, then align the other pipe mouth with the end pipe mouth, move the sealing ring to the sealing surface of the two pipe mouths, and the two sides of the sealing ring should not protrude into the two pipes Groove.
(2) Install the joint: first loosen the two screws of the joint, divide it into two pieces, put two pieces of shell on the sealing ring, insert the bolts, and tighten the nut in turn to ensure that the two ends of the shell enter the groove until it is tightened.
2, mechanical three-way, mechanical four-way installation
First remove the bolt from the outer casing, loosen the other nut until the end of the bolt, rotate the lower casing about 90 degrees from the upper casing, and place the upper casing outlet portion at the opening of the nozzle to be aligned with the hole. Then, rotate the lower shell along the tube end (such as the mechanical cross, the lower shell method is the same as the upper shell) to close the upper and lower parts.
3, flange mounting
Install the flange: first loosen the screws on both sides, separate the two flanges, insert the ring-shaped key parts of the two flanges into the groove of the slotted pipe end, and then insert the screws on both sides to adjust the two. The side gaps are similar.
Install the sealing ring: push the “C†shaped opening of the sealing ring away from the flange and push it into the inner diameter groove of the flange along the tube end.
B, the setting of the bracket
1, fixed bracket and guide bracket
The freedom of the pipe can be controlled by the hanger and the bracket, and the spring hanger can make the pipe free.
Flexible joints allow for deflection in the pipe. This feature has great advantages in installation and engineering piping, but careful consideration should be given to the spacing of the brackets and hangers in the piping. The design and installation of the end supports must be carefully considered for the cumulative elongation of the pipe when the internal pressure increases or the temperature rises. Fixed fulcrums can be used to prevent pipe displacement caused by internal pressure and expansion. There are two types of fixed fulcrums: the main fixed fulcrum and the intermediate fixed fulcrum.
2, the impact of long pipeline
For long tube systems, intermediate fixed points are used to dissipate the forces due to tube thermal expansion and pipe internal pressure. The weight of the piping and equipment in the piping system needs to be supported by the brackets. In addition, some brackets should allow the ducts to expand and contract.
3, the impact of thermal expansion and contraction
The displacement caused by the thermal change in the piping system can be partially compensated by the piping method, and the flexible joint can effectively compensate the displacement of the pipeline caused by the thermal expansion and contraction. If the predicted displacement exceeds the total joint compensation in the system, a metal expansion joint must be installed at the relevant location of the system.
C. Actual installation of the hanger and hanger in the Changli Road system
Long riser systems are mainly in the following forms:
(1) Flexible system risers are generally fitted with fixed points at the bottom or top of each layer to prevent bending of the pipes, and the risers to which the branch pipes are connected should have intermediate fixed points; or by increasing the number of flexible joints to provide sufficient deflection angle, To prevent damage to components or branches in the system.
(2) The riser handling and welding systems in rigid systems are very similar. When there is thermal expansion, expansion joints and soft joints are used to prevent damage to components in the system. When connecting with the pump, rigid joints are designed. This system is the most have advantage of.
(3) Combination system. When designing a combined riser system, rigid joints can be used to reduce the amount of guide brackets; flexible joints can partially compensate for displacement caused by thermal expansion and contraction.
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