Are fixing and guiding brackets necessary near the compensator? ? ?

The last edit to this post was made by sunshinesandy on 2010-5-31 at 12:17. Axial wave compensators should be equipped with fixing brackets on both sides of the compensator; one of these brackets is placed next to the compensator itself, while the other is usually located at the end of the pipeline that needs to be compensated； Guiding brackets are installed on both sides of the compensator, but the required spacing between the two guiding brackets is different. I suggest you look at samples from manufacturers; they usually come with detailed information.

Guiding brackets should be installed on both sides of the compensator, while the fixing brackets depend on which section you intend to compensate for; it’s sufficient as long as it does not exceed the amount of compensation required. Under normal circumstances, it is best to install fixed brackets at both ends.

A fixed bracket must be available near the compensator

I read in the documentation that the distance from the compensator to the first fixed support is 4D, the distance to the first guide support is less than or equal to 4D, and the distance to the second guide support is 14D. If fixed supports are installed on both sides, what are the regulations regarding the distance from the second fixed support? ? ?

It should be set up! To determine the location of the fixing points, assume that they are placed in the middle of the pipe. ∏-type compensations are then added based on the direction and branching of the pipe. Two fixing points are first installed at one-quarter distances from each end of the pipe; it is necessary to ensure that the expansion amount between these two fixing points does not exceed 200 mm, due to limitations imposed by the length of the pipe supports. Based on the ∏-type compensation line diagram, determine the length of the compensation arm (L2) and its width (L3). Typically, the pipe expansion within the unit is absorbed inside the unit itself; therefore, a fixed point is generally installed on the pipe rack near the boundary where the unit enters and exits, at a distance of about 12 meters. ∏The expansion compensator should be placed as close as possible to the midpoint between the two fixed points. To prevent excessive lateral movement of the pipeline, guide supports should be installed on both sides of the compensator, at a distance of approximately 40 times the nominal diameter of the pipeline from the elbow part of the compensator.

I spent a long time looking at SH3073-2004 but couldn’t figure out how to calculate the position of the second fixing frame; it was the person upstairs who explained it clearly

According to petrochemical standards, compensators should be installed between two fixed supports; is it sufficient to use the ASME empirical formula for flexible analysis to determine the positions of these fixed supports? ? ?

Below are the materials provided by a certain manufacturer; I hope they will be useful to everyone! 1. Main fixing pipe racks shall be installed at the pipe sections where axial compensators are installed, at the blind ends of pipes, at elbows and areas with varying cross-sections, at the parts equipped with stop valves or pressure reducers, and at the entrances where side pipelines connect to the main pipeline. The main fixing bracket must take into account the static pressure thrust of the bellows as well as the elastic force resulting from deformation. The thrust calculation formula is as follows: Fp = 100 * P * A, where Fp represents the axial force exerted by the compensator (in N), A is the effective area corresponding to the average diameter of the corrugations (in cm2), and P is the maximum pressure in that pipe section (in MPa). The formula for calculating the axial elastic force is as follows: Fx = f * Kx * X. Where FX is the axial elastic force of the compensator (N), and KX is the axial stiffness of the compensator (N/mm) ； The f-coefficient: when there is \"pre-deformation\" (including the case where the pre-deformation amount △X=0), f=1/2; otherwise, f=1. In addition to the aforementioned areas, intermediate fixed pipe racks can be installed on the pipeline. The intermediate fixed pipe rack does not need to take into account the effect of pressure thrust. 2. Only one axial type compensator can be installed between the two fixed pipe supports of a pipe segment. 3. The layout of the fixed pipe racks and guide pipe racks is recommended to be configured as shown in the figure below. One end of the compensator should be close to the fixed pipe rack; if it is too long, guide racks must be installed in accordance with the requirements for the first guide rack. The maximum spacing between the other guide racks can be calculated as follows: LGmax – maximum guide spacing (m) ； E-pipe material elastic modulus (N/cm2) ； i-tp pipe cross-sectional moment of inertia (cm4) ； KX – Axial stiffness of the compensator (N/mm), X0 – Displacement amount for compensating adjustment (mm). When the compensator is compressed, the symbol is “+”; when it is stretched, the symbol is “-”. When the pipe wall thickness is designed according to the standard thickness, LGmax can be selected in accordance with relevant standards.

Compensators are designed to absorb displacements between two fixed points; these fixed points can be the nozzles of the equipment, or the pipeline can be artificially divided into several sections, with expansion joints being installed in each section. If the pipeline is long, guide supports must be installed – the first guide support should be located 4D away from the expansion joint, while the distance between the second guide support and the expansion joint should not exceed 14D

It needs to be installed, but not necessarily in the vicinity; the exact distance depends on your pipes and temperature conditions. It is recommended that you consult the heat pipeline manual