Choosing spring supports can be a confusing and time consuming task, we are here to help!
How To Choose Variable Spring Supports
1. Size of load to be supported by the hanger
The travel series (maximum vertical displacement) is a function of the hot load and must fall within the variability range of the support. Undersizing the hanger leads to the accumulation of undesirable external loads that dissipate through connections, other supports or pipeline equipment leading to system instabilities. Maximum deflection should correspond to the spring rate. A certain amount of load will give a definite extension or retraction distance of the compression spring. Using hangers with extra-long springs tends to increase pipe instability. Ideally, the hanger needs to support the total piping loads without deforming or impeding thermal expansion.
2. The physical arrangement of hangers
Pipe supports can be top hanging or base mounted depending on the strength and physical characteristics of the attachment structures for the hangers. The physical arrangement of supports needs to provide sufficient headroom and limit interference. In practice, pipes could be suspended vertically from beam weldments or upwards from the floor.
The Selection Procedure
Determine the permissible hot load for the piping system and the Accompanying Vertical displacement.
Estimate the travel range based on the hanger’s spring rate
Select the tiniest spring that satisfies hot load displacements ( Maximum Displacement at hot load should lie within the spring’s deflection range).
Verify if the cold load lies within the spring’s operating range.
Should the cold load lie beyond the selected spring parameters, select the next one with a higher travel range.
If the spring satisfies hot and cold load requirements, verify if the variability lies within the acceptable limits.