Calculation problems for bellows compensators

Selected based on the expansion amount of the pipe: linear expansion coefficient of the pipe material * temperature difference * pipe length

Calculation formula: X = a·L·△T, where X represents the amount of pipe expansion. a is the linear expansion coefficient, with a value of 0.0133 mm/m; L is the length of the compensation pipe (the distance between the fixed supports of the pipe that requires compensation); △T is the temperature difference (medium temperature – ambient temperature at the time of installation). Requirements for the installation and use of compensators: 1. Before installation, it is necessary to check the model, specifications, and piping configuration of the compensator to ensure that they meet the design requirements. 2. For compensators with an inner sleeve, care should be taken to ensure that the direction of the inner sleeve is consistent with the flow direction of the medium; for hinge-type compensators, the plane of rotation of the hinge should be aligned with the plane of displacement rotation. 3. For compensators that require \"cold tightening,\" the auxiliary components used for pre-deformation should be removed only after the piping installation is complete. 4. It is strictly prohibited to use the deformation of wave compensators to adjust the installation tolerances of pipelines, as this may affect the normal functioning of the compensators, reduce their service life, and increase the load on the piping system, equipment, and supporting components. 5. During installation, it is not allowed for welding slag to splash onto the surface of the wave shell, nor is it permitted for the wave shell to suffer any other mechanical damage. 6. After the piping system is installed, the yellow auxiliary positioning elements and fasteners used for installation and transportation on the wave compensators should be removed as soon as possible. The limiting devices should then be adjusted to the specified positions in accordance with the design requirements, so that the piping system has sufficient compensation capacity under various environmental conditions. 7. All movable components of the compensator must not be blocked by external elements or have their range of movement restricted; normal operation of all moving parts must be ensured. 8. During the hydrostatic test, the secondary support brackets at the ends of the pipelines equipped with compensators should be reinforced to prevent the pipelines from moving or rotating. For compensators used in gas media and their connecting pipelines, attention should be paid to whether temporary supports are needed when filling them with water. The chloride ion content in the cleaning solution used for hydrostatic testing shall not exceed 25PPM. 9. After the hydrostatic test is completed, the water accumulated in the wave tank should be drained as soon as possible, and the inner surface of the wave tank should be dried promptly. 10. The insulation material in contact with the compensator bellows should be free of chlorine. Compensator installation distance: The hot water supply pipes should make use of natural bends as much as possible to compensate for thermal expansion; compensators should be installed where there are overly long straight sections. The type, specifications, and location of the compensator shall meet the design requirements, and pre-stretching shall be carried out in accordance with relevant regulations. Our company also produces wave compensators. If you need them, feel free to contact me; I’ve added you on Q. Let me know if I can be of any help

Reply to 3# xu007jia: What’s your QQ number? Add me; it’s 312692073. That’s someone else’s HaiChuan account

Reply to 5# LXDING: We are designing a low-pressure steam pipeline with a length of around 200-300 meters, and it is specified that wave compensators should be used

I have been learning about *pipeline design recently, and this is exactly the area that interests me. Unfortunately, I don’t know much about it myself. Regarding the question raised by the poster, I think it’s necessary to first calculate the thermal expansion of the pipeline, and then, based on the thrust that the fixing brackets can withstand, determine the distance between the two fixing brackets; a bellows compensator should be installed within this distance.

These should be installed in accordance with the manufacturer’s specifications; once installed, stress analysis software can be used to carry out calculations.