Hygienic Line Slope / GSD Drainability Calculator (ASME BPE) — Sample Report

ProjectSample Project — Demonstration Only	Job No.SAMPLE-001	Client—
CalculationHygienic Line Slope / GSD Drainability Calculator (ASME BPE)	Calc byPiping Toolset (calc-core)	Checked byUNCHECKED — sample
Date2026-09-03	Rev0	BasisASME BPE SD-2.4.3 GSD designations

1 · Design inputs

A transfer line installed at 1 in of fall over 192 in of run (16 ft), drawing calls GSD1.

Rise	1	in
Run	192	in
Target	GSD1	—

2 · Method

slope ratio = rise / run (canonical, dimensionless)

GSD1 = 1/16 in/ft · GSD2 = 1/8 in/ft · GSD3 = 1/4 in/ft (GSD0 = no slope)

The calculator first reduces the input to a canonical rise/run ratio — either from a rise and run pair (any single length unit; the unit cancels) or from a direct slope entry converted exactly from in/ft, mm/m, percent or degrees. The GSD thresholds are keyed to the definitional in/ft column, and every other representation is an exact conversion of it — GSD2 is 1.0417 %, not the rounded 1 % of field shorthand. The achieved ratio is then tested against each threshold with a float-tolerant comparison, so a slope defined exactly at a boundary (1 in over 16 ft) counts as meeting it regardless of the conversion path. Output is the highest designation met, the achieved slope, the target minimum and the margin in your report unit (in/ft by default), with PASS/FAIL against the target — GSD2, the SD-2.4.3.3 recommended minimum drainage slope, unless you select otherwise. A slope that meets GSD0 but not the recommended minimum draws an explicit warning naming the highest designation met, so a technically-passing shallow target is never mistaken for good practice on a line that is meant to drain.

3 · Calculation

Ratio: 1/192 = 0.0052083 → 0.0052083·12 = 0.0625 in/ft = 1/16 in/ft.
Equivalents: 5.208 mm/m · 0.521% · 0.298°.
GSD1 minimum is 1/16 in/ft → met exactly, margin 0.0 → PASS, highest designation GSD1.

4 · Results PASS

Slope	0.0625 (1/16)	in/ft
Equivalent	5.208	mm/m
Highest GSD met	GSD1	—
Verdict	PASS	—

5 · Verification statement

The result values above are locked as fixture slope-check.json, case “1:192 (1/16 in/ft) meets GSD1 exactly -> pass”, tolerance 0.00001, 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-2.4.3, gravity slope designations (GSD) for drainability (embedded).

SAMPLE REPORT — auto-generated from a verification fixture to show the report format. Not a project calculation. ⚠ Engineering-aid tool. Public code equations; allowable-stress and factor data are user-supplied. Results MUST be independently verified and reviewed by a qualified/licensed engineer before any design, fabrication, or operation decision.