Is the axial internal pressure corrugated compensator the same as the direct buried corrugated compe

No, the directly buried corrugated compensator is mainly suitable for axial compensation, and at the same time has super bending resistance, so the impact of pipeline sinking is not considered. Directly buried corrugated compensator shell and guide sleeve to achieve free telescopic compensation other performance is the same as ordinary corrugated compensator. The axial internal pressure corrugated compensator consists of a bellows and two end pipes, the end pipes are either directly welded with the pipe, or welded with the flange and then connected with the pipe flange.

The tie rod on the corrugated expansion joint is mainly used as a rigid support in the transportation process or as a product for deformation adjustment, and it is not a load-bearing part. The internal pressure corrugated compensator has a simple structure and low quality, so it is preferred.

There are many kinds of "axial internal pressure corrugated compensator", and the name is more general, and it also covers "direct buried corrugated compensator". The "axial internal pressure corrugated compensator" you are referring to should be a "general-purpose compensator".

Here's an introduction to the differences between the two::

The general-purpose corrugated compensator is generally suitable for overhead and small compensation pipelines, and is also suitable for a kind of corrugated compensator used in the directly buried pipeline detection well to facilitate the installation of valves, and the general-purpose corrugated compensator cannot only be buried and installed.

The directly buried corrugated compensator is the most commonly used compensator to absorb the thermal deformation of the directly buried pipeline, which is used for axial compensation, with a large amount of compensation, and has super bending ability, and can be directly used for direct burial installation.

The universal corrugated compensator cannot be installed buried. No matter what kind of corrugated compensator, it must be designed and used by the design department, and should not be installed blindly to avoid damage. It is recommended to use Hebei Weiye corrugated pipe to manufacture **** Baishun brand corrugated compensator, Baishun brand corrugated compensator "well-known brand in the Chinese market".

The directly buried sleeve compensator is mainly composed of sleeve (core tube), shell, sealing material, etc., and an anti-pull-off device is designed to ensure that it is not pulled apart when it expands to the limit position, so that the safety of the entire pipe network operation is greatly improved. The inner sleeve of the sleeve compensator is connected with the pipeline, and adopts the principle and structure of high-performance self-pressure dynamic seal, which can slide freely in the shell with the expansion and contraction of the pipeline, and can adapt to the sealing requirements of any pipeline. The new synthetic material is used to seal between the shell and the inner sleeve, which can withstand high temperature, corrosion and corrosion.

The corrugated compensator is composed of bellows and flange joints. It is a compensation device used to absorb the dimensional changes of pipelines, conduits or containers caused by thermal expansion and cold contraction by the effective expansion and contraction of the elastic element of the corrugated compensator, and belongs to a compensation element. Absorption of axial, lateral, and angular displacements.

The direct buried sleeve compensator is used for the telescopic element of the directly buried pipeline, and its structure is mainly composed of casing (core tube), shell, sealing material, etc., and its characteristics are mainly that the telescopic core can be freely stretched and compensated under the protection of the shell and the guide sleeve, and is now mainly used for hot water, steam and grease media, such as urban heating, metallurgy, mining, power generation, petrochemical, construction and other industries of transportation pipelines; The corrugated compensator is a compensation element supported by bellows, which can not only absorb the displacement and compensate for the expansion and contraction of the medium in the pipeline caused by the temperature through which the medium passes, but also has the characteristics of bending resistance, large compensation amount and long service life, and is now mainly suitable for axial compensation of directly buried pipelines.

Performance characteristics of external pressure expansion joint: The external pressure bellows expansion joint is composed of an inner cylinder, a bellows, an outer cylinder and auxiliary components. The expansion joint is subjected to external pressure, has good closure and bending resistance, and can absorb large displacement amounts.

It can be made into single, duplex, two-way and other forms. The axial external pressure expansion joint mainly absorbs the axial displacement, and has the advantages of large compensation, good thermal insulation performance, and residual medium can be removed.

2. Precautions for installation and use of external pressure expansion joints:

The direction of the inner liner should be consistent with the flow direction of the medium (flow direction markers are shown on the expansion joints).

Pay attention to the air vent facing up and the trap facing down when installing.

After the installation on site, the small tie rod must be removed.

Axial internal pressure corrugated compensator, also known as axial corrugated expansion joint, axial compensator, axial metal expansion joint, is mainly used to compensate for axial displacement, can also compensate for transverse displacement or axial and transverse combined displacement, has the ability to compensate for angular displacement, but generally does not apply it to compensate for angular displacement. Axial internal pressure corrugated compensator, also known as axial corrugated expansion joint, axial compensator, axial metal expansion joint, is mainly used to compensate for axial displacement, can also compensate for transverse displacement or axial and transverse combined displacement, has the ability to compensate for angular displacement, but generally does not apply it to compensate for angular displacement.

The axial external pressure corrugated compensator is mainly used for the directly buried pipeline with axial deformation, and the axial external pressure corrugated compensator has the advantages of large compensation amount and good thermal insulation performance. Auspicious can be consulted: Hebei Weiye bellows manufacturing ****, Baishun brand axial external pressure corrugated compensator, Hebei Province famous trademark.

Recommend Gongyi Bangsheng pipeline equipment****.

1. The directly buried internal pressure corrugated compensator is mainly used in heating pipelines, such as hot water pipelines and steam pipelines, and there are three main types of compensation methods.

1.Disposable directly buried internal pressure compensator.

Its working principle is that after the product is installed on the pipeline, the pipeline is heated to the required temperature, the pipeline is thermally elongated, the corrugated compensator is compressed accordingly, and the outer coat annular seam is sealed and welded in this state, and the compensator becomes a rigid whole, and there is no longer the ability to compensate. In the work, it is compensated by the tensile and compressive elastic deformation of the pipeline, so in essence, the pipeline is directly buried without compensation.

2.Free compensation direct buried internal pressure corrugated compensator.

This structure enables the bellows to achieve free expansion and contraction compensation under the protection of the shell, and other properties are the same as those of the non-directly buried corrugated compensator. Compared with the one-time direct burial compensator, this kind of compensator has less pipeline deformation stress, simple installation, and the expansion joint has bending resistance, but the influence of pipeline sinking can not be considered. Cons:

Because it is directly buried underground, the compensator is required to have the same life as the pipeline, and the life span is generally not less than 20 years; The volume is large and the cost is high.

3.Well-mounted corrugated compensator.

This kind of corrugated compensator is a pipeline direct buried compensator located in the well to achieve free compensation. Because the pipeline is buried in the ground and sinks with the soil layer, the axis of the pipeline deviates greatly from the axis of the corrugated compensator, which will seriously damage the corrugated compensator. Therefore, a sliding bearing should be added to the pipeline, and the first sliding bearing should be made on the borehole wall, and the bearing should be 14d away from the borehole wall.

In this way, even if the soil layer sinks, it will not cause the pipe to deviate from the corrugated expansion joint.

Second, the characteristics of the above three kinds of corrugated compensators.

1.In the above three forms of compensator, the one-time directly buried corrugated compensator is equipped with a mobile boiler due to the requirement of pipeline heating in the installation and construction, which increases the difficulty of construction and affects its application and promotion. If the construction equipment is matched, the pipe heating technology is solved, and the installation is simple, this compensation method is of great significance.

2.The free compensation direct buried corrugated compensator has the characteristics of free compensation and simple installation on the directly buried pipeline, so it is very popular with engineering designers. However, because the corrugated compensator is directly buried underground, the product structure and life must be reliable, the installation and construction must be strict, and the chloride ion content of the soil layer and groundwater is not allowed to exceed the standard.

Therefore, it is necessary to be cautious in the selection of free compensation corrugated compensator.

3.The well-placed corrugated compensator is located in the well, and its working state is equivalent to the working state of the corrugated compensator set in the overhead or trench, which is very mature in terms of engineering design, compensator products and installation and construction in China. Therefore, according to the existing situation in China, it is more realistic and reliable to use well-placed corrugated compensators in directly buried pipelines.

For directly buried pipelines, the author recommends this compensation type.

Recommended: Hebei Weiye bellows manufacturing ****, Baishun brand direct buried corrugated compensator, expansion joint, well-known brand in the Chinese market.

The direct burial compensator is mainly used to compensate for the buried pipeline, because the protection of the jacket can be corrugated and contractile without being affected, and it mainly absorbs the axial displacement of the pipeline.

Directly buried internal pressure corrugated compensator, suitable for only axial displacement of the pipeline, this product has the ability to compensate for transverse displacement and axial fish transverse resultant displacement, but because the amount of compensation is small, only axial compensation can give full play to its characteristics, long service life, more safe and reliable.

The direct burial compensator is mainly used to compensate for the pipes used in the ground, because the protection of the jacket can be corrugated and retractable without being affected.

The corrugated compensator is a compensation device that uses the effective expansion and contraction deformation of the elastic Gaosonghuai element of the corrugated compensator to absorb the dimensional changes of pipelines, conduits or containers caused by thermal expansion and cold contraction, etc., and belongs to a compensation element. Absorption of axial, lateral, and angular displacements. Due to the different types of corrugated compensators, there are mainly axial, transverse, angular and combined compensation methods.

For the corrugated compensator with multiple displacements at the same time, it is necessary to synthesize its various displacements to find the total equivalent axial displacement, and the detection is for the total equivalent axial displacement. In other words, the detection of the nominal displacement of the corrugated compensator is the detection of the total equivalent axial displacement. The nominal displacement of a general-purpose bellows is actually the ability of the bellows to deform with a given nominal displacement.

For expansion joints (compensators) and compensators made of bellows, it is usually called compensation quantity, which reflects the ability of the bellows to absorb the displacement of the system, and indicates the maximum compensation capacity of the product under certain conditions. When the bellows is working normally, it is necessary to absorb the displacement of the system and produce displacement deformation, and at the same time, it is necessary to ensure a certain number of normal and safe working displacement cycles. Therefore, when the bellows is designed, according to the displacement size that each wave can bear, the design has a certain number of ripples, when each wave is evenly bearing the displacement load, there is no local overload, the bellows can work normally.

When the design is reasonable, it can ensure a certain number of design work displacement cycle life.

When the square compensator is installed in the middle of the two fixed and immovable parts of the pipeline, the pipeline is stretched due to temperature changes due to the destruction of the heat medium. Thermal elongation will cause horizontal pushing forces on both sides of the support frame. In order to better maintain the balance of forces, the recoil force causes the square compensator to cause a reduced deformation.

The internal stress caused by thermal deformation is compensated for by slag loss. In order to better reduce the deformation and internal stress of the square compensator in operation, the 1 2 thermal extension of the pipeline compensator should be stretched in advance to indicate the manufacturing part, the installation part and the operation part of the square compensator.

The diagram shows that when the pipeline compensator is reduced to 1 2 of the compensation amount (l), the internal stress of the pipeline compensator is equal to zero (i.e., the manufacturing part). When the pipeline compensator family compensates for the thermal elongation, only half of the internal stress is subjected to the support frame and the pipeline compensator. Therefore, in the installation of the square compensator, do a good job of pre-tensioning, because the pre-stretching amount is δl 2, so each side arm should be pre-tensioned δl 4.