Tag
#expansion
5 topics across all disciplines.
Expansion loops and offsets — sizing the detour that absorbs the growth
How a loop actually absorbs movement, the guided cantilever hand calculation that gives you a first size, why the answer never fits the rack, and the honest ranking of what to do when it does not.
Expansion joints and bellows — pressure thrust and why they are the last resort
What a bellows can and cannot absorb, the pressure thrust that dwarfs the thermal force it was fitted to relieve, tied and hinged and gimbal arrangements, guide spacing, cycle life, and the installation errors that kill them early.
Anchors, guides and restraint schemes — deciding where the pipe may move
A restraint scheme is one decision for a whole run, not a scatter of supports. Where an anchor belongs, what it actually carries once friction is counted, line stops against full anchors, the gap that is the design, and the accidental anchors that site creates.
Spring hanger selection — variable, constant, and the pin nobody pulled
Choosing a spring for a line that moves vertically. Hot and cold load, the load variation limit and when it forces a constant effort unit, travel and rod swing, why the pointer is the most useful thing on a walkdown, and the installation errors that make a spring worse than no spring.
Nozzle loads and allowables — the constraint that really governs hot piping
Why machine nozzle allowables are so small, where they come from for pumps, compressors, turbines and vessels, what exceeding them actually does, why the symptom surfaces in somebody else's report, and the design and field rules that prevent it.