How to install the bellows, the correct installation method of the bellows

Bellows installation and use requirements.

1. Before installation, the bellows should check its model, specification and pipeline configuration, and must meet the design requirements.

2. Attention should be paid to the bellows with an inner sleeve to make the direction of the inner sleeve consistent with the direction of medium flow, and the hinge rotation plane of the hinged bellows should be consistent with the displacement rotation plane.

3. For bellows that need to be "cold tightened", the auxiliary components used for pre-deformation should be removed after the pipeline is installed.

4. It is strictly forbidden to adjust the installation deviation of the pipeline by the method of bellows deformation, so as not to affect the normal function of the compensator, reduce the service life and increase the load of the pipeline, equipment and supporting components.

5. During the installation process, welding slag is not allowed to splash on the surface of the corrugated shell, and the bellows is not allowed to be damaged by other machinery.

6. After the installation of the pipe system is completed, the yellow auxiliary positioning components and fasteners used for installation and transportation on the bellows should be removed as soon as possible, and the limiting device should be adjusted to the specified position according to the design requirements, so that the pipe system has sufficient compensation ability under environmental conditions.

7. All the moving elements of the bellows shall not be stuck by the external components or limit their range of activity, and the normal operation of each moving part shall be ensured.

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8. During the hydrostatic test, the sub-fixed pipe frame equipped with the end of the compensator pipeline should be strengthened so that the pipeline does not move or rotate. For the compensator and its connecting pipeline used for gas medium, it is necessary to pay attention to whether it is necessary to add a temporary bracket when filling with water. The 96 chloride ion content of the water cleaning solution in the hydrostatic test does not exceed 25ppm.

9. After the hydrostatic test, the water in the wave shell should be drained as soon as possible, and the inner surface of the wave shell should be dried quickly.

10. The insulation material in contact with the compensator bellows should not contain chloride ions.

There is a certain skill in installing the corrugated compensator, which requires skilled operation technology and a detailed understanding of the performance and structure of the corrugated compensator to reach the point of proficiency.

The corrugated compensator connection method is divided into two types: flange connection and welding. The compensator of the directly buried pipeline is generally welded (except for trench installation).

Calculation method of heat correlation of bellows compensator: calculation formula: x=a·l· tx pipeline expansion a is the linear expansion coefficient (take the length of the compensation pipeline (the distance between the fixed supports of the required compensation pipeline) t is the temperature difference (medium temperature - ambient temperature during installation).

Metal compensator installation requirements: The corrugated compensator should be checked before installation, and its model, specification and pipeline configuration should be checked, and it must meet the design requirements; Attention should be paid to the compensator with an inner sleeve to make the direction of the inner sleeve consistent with the direction of medium flow, and the hinge rotation plane of the hinge type compensator should be consistent with the displacement rotation plane; For compensators that need to be cold-tightened, the auxiliary components used for pre-deformation should be removed only after the pipeline is installed; It is strictly forbidden to use the method of corrugated compensator deformation to adjust the installation deviation of the pipeline, so as not to affect the normal function of the compensator, reduce the service life and increase the load of the piping, equipment and supporting components.

Dear, hello, I am glad to answer for you the correct installation method of the corrugated pipe A1, before the socket, first check whether the specifications of the rubber sealing ring are consistent with the supporting products, intact and elastic. The rubber seal should be installed in the slot between the first and second crests of the socket. The seals must be bottled in a straight line and the number of installations should be based on the relevant design requirements.

If two seals need to be installed, they can be placed at intervals with a corrugation. 2. When interface, first clean the inner wall of the HDPE double-wall corrugated pipe socket, and apply lubricant on the inner wall of the socket and the rubber ring of the HDPE bellows socket, and then align the central axis of the end face of the socket. 3. The interface method should be carried out according to the following procedure:

For DN400 and below pipes, one person first hangs the socket of the installed HDPE double-wall corrugated pipe with a cotton yarn rope, and the other person uses a long crowbar to insert the foundation obliquely, and resists the transverse baffle at the center of the end of the double-wall corrugated pipe, and then forcefully inserts the PE bellows into the socket of the HDPE double-wall corrugated pipe pipeline to be installed to the predetermined position; For PE pipes above DN400, two lever hoists can be used to pull the pipe section in place. When the interface is closed, the lever hoist on both sides of the pipe section should be pulled synchronously to make the rubber sealing ring correctly in place, without twisting or falling off. The installation method of the bellows joint 1, the bellows joint should pass the test of non-deformation under the action of 1kn radial force before installation, and the irrigation test should be carried out at the same time to check whether there is leakage, and it can only be used when there is no deformation and leakage.

2. For the connection of the corrugated pipe joint, a large corrugated pipe of the same type should be used as the joint pipe, and the length of the joint pipe is 200mmAfter the bellows is connected, seal it with sealing tape to avoid the cement slurry from penetrating into the pipe and causing the pipeline to be blocked when the concrete is poured. 3. The position of the bellows should be installed accurately, and the steel bar clamp should be fixed with iron wire binding to avoid the displacement of the pipeline in the process of pouring concrete.

4. If the bellows joint is repeatedly bent, attention should be paid to prevent the pipe wall from cracking during operation, and at the same time, it should prevent the adjacent welding spark from burning the pipe wall. If there is a small damage to the micro eggplant, Mingfeng should repair it in time and be recognized by the supervising engineer.

Summary. Bellows rubber ring installation method: Before installation, you first need to check whether the appearance of the bellows is cracked or has quality problems, and if so, replace it in time.

At the same time, it is also necessary to check whether the rubber ring and the tube match and the size is consistent. If there is dirt on the surface. Next, the rubber ring is inserted into the interface part of the bellows, and the interface must not be bent or reversed.

It is also necessary to apply lubricant to the joint, which can also be replaced by soapy water, and apply it in moderation.

Bellows rubber ring installation method: Before installation, you first need to check whether the appearance of the bellows is cracked or has quality problems, and if so, replace it in time. At the same time, it is also necessary to check whether the rubber ring and the tube match and the size is consistent.

If there is dirt on the surface. Next, the rubber ring is put into the interface part of the corrugated hole pipe, and the interface can not be bent or bent in the opposite direction. It is also necessary to apply lubricant to the joint, which can also be replaced by soapy water, and apply it in moderation.

Clause. 1. Before installation, check the quality of pipe fittings and rubber seals, clean up the dirt of the socket and socket, and then install the rubber ring in the groove of the socket, which shall not be twisted, and the special-shaped rubber ring shall be installed correctly and shall not be reversed. Clause.

Second, the length of the pipe end should be left to the base Li Qing out of the temperature difference of the expansion and contraction, its value should be calculated and determined according to the closed temperature difference during construction. Clause.

3. After the depth of the insertion is determined, the depth of the insertion should be drawn at the end of the pipe. Clause.

4. Apply lubricant on the rubber ring and the socket insertion. The lubricant must be non-toxic, odorless, and will not breed bacteria as soap or detergent, it is strictly forbidden to use butter, no damage to the waterproof sleeve and rubber ring (a engine oil and other oils as lubricants). Clause.

5. Insert the socket into the socket, align it with the axis, and use special tensile tools such as wire tighteners to evenly insert the person to the target at one time. When it is difficult to insert people, check that the rubber ring is in place. Clause.

6. Use the feeler gauge along the interface gap along the circumference of the pipe to check whether the position of the rubber ring is correct.

Bellows connection method: butt welding method, welded pipe hoop connection method, thread connection method, linear elastic socket pipe connection method, socket sleeve method with sealing ring, flange connection method, etc.

1. Butt welding method: butt welding bellows compensator is mainly used on large-diameter pipelines, and the reason why welding is chosen is because when the compensator and pipeline are successfully welded, there will be no leakage in the future use process.

2. Welded pipe hoop coupling method: welded bellows is a new type of component that has emerged at home and abroad in recent years, which can generally be used as sensitive components, sealing elements, isolation media, pipeline connections and temperature compensators.

3. Thread connection clever way: the mu cover key first cuts off the end face of the spiral bellows 3, and removes the burr to ensure that the stop washer 4 and the sealing ring 5 can be smoothly screwed into the spiral bellows.

4. Linear elastic socket pipe connection mode: when connecting, first clean the inner wall of the double-wall corrugated pipe socket, and apply lubricant on the inner wall of the socket and the rubber ring of the PE bellows socket, and then align the central axis of the end face of the socket.

5. Socket casing mode with sealing ring: increase the elasticity and deformation space of the sealing ring, and have a strong adjustment ability to increase the gap and deformation caused by the deformation and connection deflection of the pipeline connection, and effectively improve the sealing ability.

Check whether the bellows quality is damaged and whether the models match. Once confirmed, the bellows can be connected to the designed position and secured with fittings. Then use welding equipment to weld to avoid welding slag everywhere.

When the bellows is welded, remove the fixed fittings.

There are many categories of bellows, and there are corresponding standards for its installation location and field, in order to ensure that there will be no laughing problems in the later construction, you need to find out the model category used by the self-limb walker before purchasing the bellows, so as not to buy the wrong one.

If a bellows of the inner sleeve type is equipped, to ensure that the direction of the vertical sleeve is the same as that of the internal mustard flow, if it is equipped with a hinged bellows, the hinge should rotate in the same direction as the direction of its moving plane.

If the bellows has to be cooled and tightened, all its accessories must be removed after the construction is completed, so as to avoid affecting the normal operation of the experience, and if the pipeline installation is not in place, the bellows can not be deteriorated, otherwise it will also affect the later use.

Things to pay attention to when buying bellows

1. The bellows used in the water dispenser needs to pay attention to its service life. When used for a little longer, it will lead to more impurities in the room, affecting the normal use, then it needs to be checked and cleaned. If the bellows is found to be rusty, it should be replaced in time.

2. When installing the bellows of the water dispenser, it is necessary to check the pressure problem, if the pressure is insufficient, it will lead to cracks in the pipeline, resulting in water leakage. Moreover, the pressure resistance of different bellows is different, and the installation needs to be handled by professionals to reduce the occurrence of problems.

3. When buying bellows, you also need to consider the issue of its brand. If it is a brand product, not only the quality is better, the use time is longer, and the after-sales service in the later stage will be better, so there is no need to worry about affecting the normal use in the later stage.

Summary. Dear Glad to answer for you. The heat shrinkable pipe connection is generally used for HDPE corrugated pipes with a pipe diameter of less than 1200mm (at present, only fiber reinforced polyethylene heat shrinkable tape can be used to add clamps along the two outer layers of the interface).

First of all, the outer wall of the pipe at the connection site should be polished clean, the surface of the pipe should be treated, and the heat shrinkable pipe (belt) should be sleeved at the two ends of the pipe to be connected, and then the inner wall of the heat shrinkable pipe (belt) and the outer wall of the pipe should be bonded, and a constant tightening force should be formed after cooling to meet the requirements of the pipe connection.

Dear Glad to answer for you. The heat shrinkable pipe connection is generally used for HDPE corrugated pipes with a pipe diameter of less than 1200mm (at present, only fiber reinforced polyethylene heat shrinkable tape can be used to add clamps along the two outer layers of the interface). First of all, the outer wall of the pipe of the connection part should be polished clean, the surface of the pipe should be treated, and the heat shrinkable pipe (belt) should be sleeved at the end of the two pipes to be connected, and then the inner wall of the heat shrinkable pipe (belt) and the outer wall of the pipe should be glued and widened, and the liquid should be cooled into a constant tightening force to meet the requirements of pipe connection.

When using a heat shrinkable connection, the ends of the pipe to be connected should be aligned to leave as little gap as possible. When the heat shrinkable sleeve is heated, attention should be paid to the flame temperature, which can be gradually heated from the middle of the heat shrinkable sleeve to both sides, or gradually increased from one end to the other.

When the two pipes are aligned, it is necessary to take a few fulcrums under the two pipes to pad and align. The two ends of the connected Zitanzheng nozzle are scrubbed clean with rags and water to ensure that the connection of the nozzle is dry and free of dirt before proceeding to the next process.

The pipes at both ends of the nozzle are leveled and straight, the gap between the seams is generally required to be 0-6mm, and the dislocation deviation of the nozzle is generally not greater than 2mm.