PSA 7.1 — Variable Spring Hangers: Selection, Hot/Cold Load, Travel and the 25 % Rule
A 12″ hot-oil line leaves a vessel and runs along a rack. One hanger, mid-span, carries about 12 kN. The stress report specifies a variable spring: hot load 12.0 kN, upward travel 40 mm. It is installed, the system is hydrotested, and the plant runs.
Eleven years later, during a turnaround, a fitter notices that the spring can's travel stops — the pins fitted at the works so the hanger can be handled and tested as a rigid strut — are still in place, painted over.
Before you read on, commit to an answer: for eleven years, how much load…
🔒 Members only
The rest of this lesson is in the members' libraryThe full text, the 3D model, the worked example and the quiz.
Join to read it →A members' lesson from EPiC Circle
This one is part of the members' library — the full lesson, its 3D model, the worked example and the quiz open with membership. Dozens of lessons across every EPC discipline are free to read without an account.
See what's free →Educational teaching material — simplified and illustrative. Not for engineering
design use.
© EPiC Circle · provided by PipeAxis