Pipe Wraparound Template Ordinates
Markback ordinate table for wrapping a template to scribe an angled pipe cut.
Example
You enter
- Pipe outside diameter (in) 6.625
- Cut angle from square (deg) 45
- Stations around circumference 8
You get
- Max ordinate (in) 6.625
- Circumference (in) 20.813
Checked against published worked examples from: NCCER Pipefitting / standard layout references (by name).
Details, formula, and sources
Formula or tableFor a plane cut at angle alpha from square, longitudinal offset at circumferential station phi: y(phi) = (OD/2) * tan(alpha) * (1 - cos(phi)), phi over 0..360 in equal stations; circumference = pi*OD; max ordinate = OD*tan(alpha).
Source and editionThe pipefitter's wraparound (ordinate) method for marking an angled pipe cut, y = (OD/2)*tan(alpha)*(1 - cos(phi)), as taught in NCCER Pipefitting and the standard layout references, by name; first-principles geometry.
Free accessPublic first-principles geometry. A layout aid - the bevel and fit-up govern the finished joint.
What governsEstimate. AHJ and licensed professional govern.
API field namesoutside_diameter_in, cut_angle_deg, stations, max_ordinate_in, circumference_in
- Layout aid the bevel and fit-up govern the finished jointlayout reference