What is the difference between direct and expansion joints in water supply and drainage pipes

Direct (should be a straight section): also known as the outer section, it is used to connect two sections of straight pipe.

Expansion joints.

First, the appearance is different.

1. The straight section is a straight pipe.

2. There are corrugated expansion joints on the outside of the expansion joint pipeline.

Second, the use is different.

1. The straight section is used to connect the pipeline.

2. The expansion joint is used to compensate for the expansion and contraction deformation of the pipeline due to temperature changes.

Straight joint: Expansion joint:

Extended Materials. Expansion joint function:

1. Compensate for the expansion and contraction deformation caused by the axial, transverse and angular heating of the absorption pipeline.

2. Absorb equipment vibration and reduce the impact of equipment vibration on the pipeline.

3. Absorb the deformation of the pipeline by subsidence.

Expansion joints (expansion joints) are used to compensate for the expansion and contraction deformation of pipelines due to temperature changes, and are also used for length compensation required by pipelines due to installation adjustments, etc., which are mainly divided into elbow expansion joints, bellows expansion joints and casing expansion joints.

3 structural forms.

An expansion joint in which the tube is bent into a U-shape or other shape, and the elastic deformation ability of the shape is used to compensate for it. Its advantages are good strength, long life, and can be made on site, while the disadvantages are that it occupies a large space, consumes more steel and has large friction resistance, and this expansion joint is widely used in various steam pipelines and long pipelines.

Encyclopedia - Water supply pipes.

Summary. There is a riser, when it is installed, it can pass through the floor part and play the role of fixing and supporting. If the length does not exceed 4 meters, one should be set for each floor.

In addition, the maximum spacing between expansion joints should be 4 meters, and it should also be set every 4 meters. If it is a horizontal pipe, it needs to be connected with the steel pipe when setting. If the length exceeds meters, then a telescopic joint should be installed every 3 meters.

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Hello! The drainage pipe expansion joint is set at 4 meters or 3 meters at a time.

There is a riser, when it is installed, it can pass through the floor part and play the role of fixing and supporting. If the length does not exceed 4 meters, one should be set for each floor. In addition, the maximum spacing between expansion joints should be 4 meters, and it should also be set every 4 meters.

If it is a horizontal pipe, it needs to be connected with the steel pipe when setting. If the length exceeds meters, then a telescopic joint should be installed every 3 meters.

This kind of expansion joint can also be called a compensator, which is mainly divided into several types. Some are corrugated, some are square or sleeved, the first of which is more commonly used, which can ensure the safe operation of the pipeline and reduce the vibration impact of the equipment on the pipeline. If ** occurs, it can also avoid the shock wave generated by ** and reduce the amount of deformation.

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1. When the design is not clearly specified, it can be installed in a convenient and easy maintenance position, and the following describes several expansion joint installation schemes: riser expansion joint installation: Horizontal pipeline expansion joint installation:

Branch pipe expansion joint installation: Expansion joint through the floor installation: Second, the main purpose of the expansion joint is to eliminate the expansion and contraction of the pipeline and prevent the pipeline from deformation and rupture due to hot expansion and cold contraction.

3. The expansion joint of the drainage pipe on the building standard should be added to the floor slab, and it is best to place it at about 20 cm from the ground along the lower edge of the expansion joint. There are no specific requirements for its distance from tee.

When the expansion joint of the sewer pipe is installed, the sewer pipe is too long, you can saw off a section of the sewer pipe and then install the expansion joint, or purchase a reducer joint for installation.

If the part of the sewer pipe is fixedly supported, when the length of the riser is not more than 4m, an expansion joint should be set up on each floor; When the length of the interstory riser is greater than 4m, the number of expansion joints should be determined according to the calculated deformation of the pipeline and the allowable expansion of the expansion joint. The part where the riser passes through the floor slab is an unblocked floor.

Installed at the lower end of the cross-branch pipe tee, the spacing of the connecting pipe end fittings is 10 cm to facilitate telescopic, and the height of 2 meters is installed at the non-tee, because the pipe clamp bracket is usually installed at 1 8 meters. If you can't install it yourself, you can ask a professional sewer pipe dredge personnel to install it.

1. The setting of the expansion joint of the plastic drainage pipe is generally determined according to the requirements of the design document or the type of pipe, the joint method, and the location of the environment. 2. The setting of the expansion joint of the riser: if the drainage riser passes through the floor slab and is fixedly supported, when the length of the riser is not more than 4m, an expansion joint should be set up on each floor; When the length of the interstory riser is greater than 4m, the number of expansion joints should be determined according to the calculated deformation of the pipeline and the allowable expansion of the expansion joint.

The riser crossing the floor slab is an unblocked floor, and the maximum spacing between the expansion joints is 4m, and the expansion joints should be provided with fixed supports. If there is a horizontal pipe access in the floor, when the converging pipe fitting is arranged on the upper part of the floor slab close to the floor, an expansion joint should be arranged above the confluence pipe fitting; When the converging pipe fitting is arranged at the lower part of the floor slab, an expansion joint is arranged at the lower part of the converging pipe fitting. If there is no horizontal pipe access in the floor, an expansion joint can be set up on the ground.

3. The setting of the expansion joint of the transverse pipe: when the transverse branch pipe and the transverse trunk pipe are not connected to the confluent pipe, and the length of the pipe section connected to the riser is larger, the expansion joint is arranged on the transverse pipe side close to the confluent pipe fittings. When the drainage riser is arranged in the tube well, an expansion joint is arranged on the outside of the wall close to the tube well.

In addition, a fixed bracket should be set near the socket of the expansion joint of the transverse pipe. 4. The expansion joint of the transverse pipe shall not use the expansion joint for the riser, and the pressure bearing performance of the special expansion joint of the transverse pipe shall not be less than when the design does not explain the expansion amount, the gap reserved at the expansion joint inserted at the pipe end shall be: summer, 5 10mm; In winter, the socket direction of the 15 expansion joint should meet the direction of the water flow.

In order to protect the pipeline from damage to the pipeline when there is a temperature change, it is necessary to make the pipeline both elongate and compress under the condition of ensuring that there is no leakage, so the expansion joint appears, which can deal with this problem well, similar to the expansion joint on the bridge, the reserved joint on the train track, and so on.

It is generally used relatively close to the ground but not too low, in order to prevent future pipeline damage and facilitate replacement, or it can be not long enough to be connected with him when it is almost a little bit old, one side is glued, and the side with the rubber pad is not glued, and it is directly set on the pipe above.

One disadvantage is envy, and the appearance is different.

1. The straight section is a straight pipe.

2. There are corrugated expansion joints on the outside of the expansion joint pipeline.

Second, the use is different.

1. The straight section is used to connect the pipeline.

2. The expansion joint is used to compensate for the expansion and contraction deformation of the pipeline due to temperature changes.

Third, the interface mode is different.

1. There are three ways of straight joint interface: rubber ring interface, glue adhesive interface, and flange connection.

2. Two ways of expansion joint interface: flange connection and welding.

In order to prevent the pipeline from being damaged during the thermal expansion and contraction, it plays a regulating role to prevent the pipeline from being pulled off or bursting.

Expansion joints are classified by materials such as rubber expansion joints, stainless steel expansion joints, and carbon steel expansion joints.

According to the connection method, there are welded connection expansion joints, flange connection expansion joints, and loose sleeve connection expansion joints.

The installation position of the decompression expansion joint on the drainage pipe: generally installed at the lower end of the cross-branch pipe tee, and the spacing between the connecting pipe end fittings is 10 cm, which is conducive to expansion and contraction.

Specification requirements for drainage pipe expansion joints:

1. When there are no design requirements, expansion joints should be set when the pipeline exceeds 2 meters, and the maximum spacing between expansion joints shall not exceed 4 meters.

2. If it is installed on the riser and the floor height is less than 4 meters, it should be set up on each floor. When the floor height is greater than 4 meters, it should be determined according to the design expansion amount of the pipeline and the maximum allowable elongation of the expansion joint.

When there is no design requirement for the expansion joint of the drainage pipe, the expansion joint should be set when the pipeline exceeds 2 meters, and the maximum spacing between the expansion joints shall not exceed 4 meters. When the layer height is greater than 4 meters, it should be determined according to the expansion amount of the pipeline design and the maximum allowable elongation of the expansion joint. In addition, the expansion joint should be installed close to the confluence of the water flow pipe fittings, such as when the drainage branch pipe is under the floor slab, the expansion joint should be added close to the branch pipe fittings.

When the drainage branch pipe is on the floor slab, the expansion joint should be added above the branch pipe fittings.