Pipe Rack Friction Explorer

THE LINES ON THE RACK (per bent bay)

6″ LINES — 55 kg/m operating 12″ LINES — 160 kg/m operating 24″ LINES — 440 kg/m operating BENT SPACING S RACK HEIGHT H

THE SLIDING SURFACE

FRICTION COEFFICIENT μ SIMULTANEITY k — fraction of lines sliding the same way at once WIND PRESSURE q

0kN longitudinal friction per bent

Operating weight on one bent W

Friction μ·k·W (longitudinal)

Spec floor 10 % of W

Transverse wind on the bent

Friction ÷ wind

μ at which friction = wind

WHERE IT ALL ENDS UP — THE BRACED BAY

BENTS FEEDING ONE BRACED BAY

Accumulated longitudinal shear

Diagonal angle θ

Brace axial force F/cosθ

Utilisation

What the model does. Operating weight = Σ(n·w)·S·g. Friction = μ·k·W acting along the rack at shoe level, every bent, whenever the lines move. Wind uses the common shielding shortcut — projected height = largest pipe + 10 % of the rest, C_f 0.7 on pipes and 1.6 on the two columns (0.25 m wide). The braced bay collects the friction from every bent it serves. Real projects set μ, k, the 10 % floor and the load combinations in the structural design criteria (e.g. PIP STC01015) — use those, not these.