One half = half the circumference + a tab on each end: π × A ÷ 2 + 2 × B. The full hanger is two halves. All rounding is done at the end: lengths to the nearest 1/16", decimals to 3 places, like the BCIT worksheet.
Wall strap pipe in the corner
Job examples
Pipe tight in a corner (BCIT)18 9/16" pipe, 3/4" tabs.Cut 34 5/8.
10" pipe on a wall1" tabs.Cut 19 7/8.
How it's calculated
Cut length = tab + ½ A (leg down the side) + a quarter of the circumference (π × A ÷ 4) + ½ A (leg across to the wall) + tab, or π × A ÷ 4 + A + 2 × B. Rounded to the nearest 1/16" at the end.
Hanger with one long end
Job examples
Hang a 16 3/8" pipe (BCIT)A 1 1/4, B 5, C 1.Cut 58 11/16.
24" pipe off a long hangerA 1 1/2, B 8, C 2.Cut 86 7/8.
How it's calculated
Cut length = the full circumference + both ends + the tab: π × D + A + B + C. Rounded to the nearest 1/16" at the end.
For reference only. Verify against project drawings, specifications and manufacturer data. Spotted something off? Let me know.