Heating pipes under what circumstances to increase the expansion joint 5

Calculation of the maximum installed length of the pipeline.

The pipeline with compensated direct burial should be at two high fixed points, one is at the end of the straight pipe section, and the other is at the branch of the pipeline. There is no fixed point between the two compensators of the long straight straight pipeline without branches, and the "station" naturally formed by the pipeline can play the role of a fixed point. The station point is the fixed point of the pipeline between the two compensators, and the distance between the station point and the two compensators is equal when the pipe diameter is the same and the buried depth is the same.

The distance between the blanket compensator (including the natural compensator at the corner) and the fixed point shall not exceed the maximum installation length of the pipeline lmax, which is defined as the length from the fixed point to the free end (compensator), and the friction generated at this length shall not exceed the corresponding elastic force under the allowable stress of the pipeline.

lmax is calculated as follows:

The maximum installation length of commonly used pipes is lmax. The combined effect of the hoop stress due to the pressure within 16kgf cm2 should be considered.

According to the expansion and contraction amount (thermal deformation) of the pipe, the expansion joint with the corresponding compensation amount is selected.

Instead of increasing, the thermal pipe should be installed with an expansion joint that can fully meet the expansion and contraction of the pipeline.

To add. Generally speaking, anything over 50m should be added. However, if there are many branches, it is recommended to add a few more. Because if the expansion amount of a single compensator is too large, it may cause damage to the tee during the expansion process.

Summary. Hello, the expansion joint on the thermal pipe does not work and the expansion joint is deformed, but that deformation is incorrect. The new replacement should loosen the nut from the distance of the compensation amount, and the normal deformation of the compensator should be compression.

Hello, the expansion and contraction of the thermal pipe will deform the expansion joint, but that deformation is incorrect. The newly replaced nut should be loosened from the hidden distance of the compensation amount, and the normal deformation of the compensator should be compression.

Have a great day! Happy every day

Professional] The diameter of the pipe directly affects how much compensation is paid, and the general diameter can be installed at 60 meters, and the compensation amount is about 100mm. Botou Hongkang expansion joint.

The formula for calculating the amount of expansion is: x=a*l*t

x Pipe expansion.

a is the coefficient of linear expansion.

Take l to compensate the length of the pipeline (the distance between the fixed supports of the required compensation pipeline).

t is the temperature difference (medium temperature - ambient temperature at installation).

Botou Hongkang Machinery Equipment (expansion joint manufacturer) reminds you: first calculate the compensation amount of the entire pipeline, and then determine the compensation amount of a single compensator, and the compensation amount of the entire pipeline A single corrugated compensator.

Compensation amount = Number of compensators. The number of meters of the overall pipeline The number of compensators = how many meters to install one. Generally, the maximum compensation amount of a single compensator will not exceed the diameter of the pipeline.

Hope mine can help you, forget. The diameter of the pipe directly affects how much compensation is made, and the general diameter can be installed at 60 meters, and the compensation amount is about 100mm.

The thermal pipeline is closely related to the temperature (the ambient temperature during installation is related to the temperature difference between the actual operation), and also related to the compensation amount of the compensator, the linear thermal expansion coefficient of the steel is, then the compensator can be found how much distance can be compensated, of course, the safety amount must be considered, under normal circumstances, the diameter of 720mm straight pipe section can be installed by 50 meters.

Second, the expansion joint.

Pipeline expansion joints are also called expanders, expansion joints, and compensators. The expansion joint of the pipeline can be axially expanded and contracted within a certain range, and can also overcome the deviation caused by the different axial directions of the pipeline docking within a certain angle, which can greatly facilitate the installation and disassembly of the valve pipeline, and can be freely expanded and contracted in the allowable expansion and contraction of the pipeline, and once it exceeds its maximum expansion and contraction, it will play a limit to ensure the safe operation of the pipeline. It is mainly to ensure the safe operation of the pipeline and has the following functions:

Compensate for the axial, transverse and angular thermal deformation of the absorption pipeline; Absorb equipment vibration and reduce the impact of equipment vibration on pipelines; Absorb the deformation of the pipeline by subsidence.

The installation of expansion joints should be determined according to the amount of expansion and contraction, these parameters are comprehensively determined by the pipe diameter, temperature difference, thermal expansion and shrinkage rate and other parameters, Gongyi Jiankun Water Supply Equipment Factory perennial production of pipeline joints, expansion joints, contact us at any time.

Summary. Necked short pipe, commonly known as variable diameter, in the heating system, plays the role of controlling flow and pressure, in the heating system, hot water from the main pipe into thousands of households, the pipeline more and more. If the diameter of the fractional path pipeline is not constantly changed, then the diameter of the pipe is getting larger and larger, and the corresponding pressure and flow rate will slow down sharply, and even isopressure loops will be formed in some places, and other pipelines tend to be stationary.

Therefore, variable diameter will be used in the heating system to change this situation, so that the change of pipe diameter carton is within a controllable range.

Necked short pipe, commonly known as variable diameter, in the heating system, plays the role of controlling flow and pressure, in the heating system, hot water from the main pipe into thousands of households, the pipeline more and more. If the diameter of the pipeline is not constantly changed, then the diameter of the pipe is getting larger and larger, and the pressure and flow rate of Xiangxianghui will slow down sharply, and even isopressure loops will be formed in some places, and other pipelines tend to be stationary. Therefore, variable diameter will be used in the heating system to change this situation, so that the change of pipe diameter carton is within a controllable range.

This is the role of the necking short pipe in the heating process.

Hope it helps.

Summary. 1. When the length of the riser is less than 4m, an expansion joint should be set up on each layer is also the use of the foundation, when the length of the riser between the layers is greater than 4m, the number of expansion joints should be determined according to the calculation of the deformation of the pipeline and the calculation of the allowable expansion of the expansion joint, which also involves specific data. 2. The pipeline shrinkage should be checked before installation, as well as its model, specifications and pipeline configuration, must meet the design requirements, in order to ensure the use, hydraulic test, can not be careless, should be equipped with the retractor pipe end of the sub-fixed pipe frame to reinforce, so that the pipeline does not move or rotate.

1. When the length of the riser is less than 4m, an expansion joint should be set up on each layer is also the use of the foundation, when the length of the riser between the layers is greater than 4m, the number of expansion joints should be determined according to the calculation of the deformation of the pipeline and the calculation of the allowable expansion of the expansion joint, which also involves specific data. 2. The pipeline shrinkage should be checked before installation, as well as its model, specifications and pipeline configuration, must meet the design requirements, in order to ensure the use, hydraulic test, can not be careless, should be equipped with the retractor pipe end of the sub-fixed pipe frame to reinforce, so that the pipeline does not move or rotate.

The pipeline expansion joint should be 4 meters and set up one pipeline expansion joint.

Can be used. The elbow is connected to an elbow composed of rubber parts, flat movable joints and loose metal trap flanges, which are used for vibration isolation and noise reduction of pipelines and protection of pipeline equipment. When the elbow is connected to the heating pipe, the pipe Wang Juhu should use a fixed bracket, otherwise an anti-pull device needs to be installed, and the force of the fixed bracket is greater than the axial force, otherwise the anti-pull device should also be installed.

DN100 elbow connection.

1. Thermal pipeline expansion joint, also known as compensator, is a kind of pipeline accessory used to absorb the thermal displacement caused by thermal expansion and contraction of the pipeline and prevent the pipeline from being damaged. The inner pipe material of the expansion joint of the thermal pipe is divided into three types: cast iron (HT), galvanized (DX) and steel (SF). There are three types of working pressure: PN6, PN10 and PN16.

2. Installation settings and precautions for the expansion joint of outdoor heating pipes:

1. The corrugated compensator should be checked for its model, specification and pipeline configuration before installation, and must meet the design requirements.

2. Attention should be paid to the corrugated 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 corrugated compensator should be consistent with the displacement rotation plane.

3. The corrugated compensator that needs to be "cold tightened", and 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 deformation of the corrugated compensator, so as not to affect the normal function of the corrugated compensator, reduce the service life and increase the load of the piping, 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 corrugated shell 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 corrugated compensator 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 capacity under environmental conditions.

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

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