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10% Variability of Spring Hangers

10% Variability of Spring Hangers

(OP)
Dear piping engineers,
A question is raised in our company that why in stress analysis specs, spring hanger's variability is reduced from normal 25% to 10% for strain sensitive equipment?
The reason stated is that if the load on an equipment is within allowable limit, then what difference does it make if the variability of the spring is 10% or 20 plus %.
In my opinion, we want to restrict the variation of load on strain sensitive equipment (Pumps, turbines, compressors) as mechanically load may be acceptable and may not damage the nozzle, but the slight strain on it may misalign the shaft slightly which may reduce the bearing life. But counter argument is that for that reason allowable load is given, and piping load is maintained below that allowable so that no strain is transferred to bearings.
Am I right in this or there is some other reason? All help is appreciated.

RE: 10% Variability of Spring Hangers

(OP)
XL83NL,
I thought nobody is giving reply there, so it might be in wrong forum. That is why I reproduced it here in the CAESAR II forum.

RE: 10% Variability of Spring Hangers

BigInch provided the right answer already

RE: 10% Variability of Spring Hangers

While it was covered in that thread, large variability means that you can have high nozzle forces.

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