-
-
Blogs
-
Equipment
-
Contact
Upholding the corporate spirit of “Integrity, Harmony, Pragmatism, and Innovation,” we remain committed to a business philosophy that puts people first, embraces technological innovation, and emphasizes integrity and pragmatism.
Analysis of the Selection and Installation of Variable Spring Supports and Hangers
Release time:
Nov 05,2020
I. Basic Principles for Selecting Springs in Variable Spring Supports and Hangers The applicable range of the spring serves as the theoretical basis for spring selection. When selecting a spring, under all circumstances, the compression must remain within the range from λmax to λmin, and both the installation load and the working load must not exceed the spring’s maximum allowable load.
I. Basic Principles for Selecting Springs in Variable Spring Supports and Hangers
The applicable range of springs represents the theoretical basis for spring selection. When selecting a spring, under all circumstances, the compression must remain within the range from λmax to λmin, and both the installation load and the working load should not exceed the spring’s maximum allowable load.
When the thermal displacement is large and a single spring cannot meet the thermal displacement requirements, springs must be connected in series. In this case, the thermal displacement value is calculated according to:
When springs are used in series, the load carried by each spring is the same. Therefore, the maximum allowable load for springs connected in series should be identical (i.e., the spring numbers should be the same, but their categories may differ).
II. Selection of Variable Spring Supports and Hangers
Determination of the identification number for variable spring supports and hangers: Based on the calculated working load, working displacement, and displacement direction during pipeline operation, refer to Table 1 in GB10182 or JB/T 8130.2 to determine the identification number.
If the pipe’s displacement direction is upward, first determine the working load by locating it between the centerline and the upper thick line in Table 1, then find the installation load by referring to the displacement amount upward.
If the pipe’s displacement direction is downward, first determine the working load by locating it between the centerline and the lower thick line in Table 1, then find the installation load by referring to the corresponding value based on the amount of displacement.
When selecting, regardless of whether the pipe displacement is upward or downward, the working load and installation load should both fall between the two sets of lines shown in Table 1, and the rate of load variation must not exceed 25%.
3. Installation and Adjustment of Variable Spring Supports and Hangers
Before installing spring supports and hangers, carefully check the selected components against the design drawings. The formal installation of pipe supports and hangers is typically carried out after the pipes have been roughly positioned but before the fixed supports at both ends of the cold-tight joints have been fully secured. The length of the suspension rods and their adjustable directions must be sufficient to accommodate the magnitude and direction of displacement at the support and hanger points during cold tightening of the pipeline. The indicator on the spring assembly should face a direction that allows for easy observation.
When installing variable spring supports, the springs are locked in place, effectively functioning as rigid supports. As a result, the forces borne by individual supports may be highly uneven. Therefore, during installation, it is essential to adjust the force exerted by each support at any time. After the supports have been fully installed, a systematic inspection and adjustment should be carried out to ensure that the fixed ends and cold tightening values at both ends meet the alignment requirements and design specifications, and that the forces on the supports do not exhibit any significant deviations—either excessively high or excessively low.
When performing cold tightening of pipelines, the load on supports and hangers should be adjusted continuously to ensure that they remain roughly at the same level as before cold tightening.
Before and after thermal insulation, a comprehensive inspection and adjustment of the stress conditions of supports and hangers shall be conducted for pipelines undergoing hydrostatic testing.
You can also learn more about industry trends.
Phone -8615226756063
Phone -8616631731810
Email -czlsg@163.com
Add: Industrial Zone, Yanta Road, Yanshan County, Hebei Province
