| ProjectSample Project — Demonstration Only | Job No.SAMPLE-001 | Client— |
| CalculationDead-Leg L/d Ratio Calculator (ASME BPE) | Calc byPiping Toolset (calc-core) | Checked byUNCHECKED — sample |
| Date2026-07-21 | Rev0 | BasisASME BPE SD-3.1.2.2 (L/d target 2) |
Instrument tee off a hygienic process line: dead-leg length 50 mm, branch ID 25 mm, standard limit of 2.
| Dead-leg length L | 50 | mm |
| Branch ID d | 25 | mm |
| Limit | 2 | — |
L/d ≤ 2 (target, ASME BPE SD-3.1.2.2)
L is the dead-leg length measured from the ID wall of the run (or the wetted flow path) to the end of the branch — including the valve body up to the seat — and d is the branch inside diameter. Units cancel; mm and inches both work as long as both entries match. Branches at or under 0.5 in draw a small-branch advisory: at small diameters, absolute length and drainability matter more than the ratio.
| L/d ratio | 2.0 | — |
| Margin | 0.0 | — |
| Verdict | PASS | — |
The result values above are locked as fixture dead-leg.json, case
“at the limit -> pass”, tolerance 1e-9, in the calc-core continuous
verification gate (see https://pipingtoolset.com/trust/validation.html). Allowable-stress and factor data are
user-supplied inputs; citations: ASME BPE — SD-3.1.2.2, dead-leg L/d design target (embedded limit under ASME authorization).