Mitered ell, long radius
Miter count and cut dimensions for a mitered pipe cover fitting, from the ASTM C450 recommended dimensional standards. Pick nominal pipe size, not OD.
Inputs
Ell
Cut dimensions
0Miters
0B · miter base (heel)
0C · miter top (throat)
0Lin. ft pipe cover per 90° cover
D is from the chart and allows for alternating cuts, saw kerf and waste. The chart gives D for a 90° cover only.
Cut layout, to scale
Side view of one length of pipe cover. Mark B on one edge and C on the other, alternating, so every cut is shared by two miters. Height is the jacket OD from the Knauf chart.
Source: ASTM C450, Long Radius and Short Radius Ells, Recommended Dimensional Standards. Check the first fitting against the elbow and metal cover before cutting a batch.