Pipe Saddle Cut Calculator

Inputs

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Actual outside diameter of the run/header pipe.
in
Actual outside diameter of the branch pipe being cut.
in
Angle between the branch centerline and the header centerline. Use 90 degrees for a straight tee and 45 degrees for a common lateral.
°

Results

Default result
Edit inputs
Long point from header CL (w_max)
3.3125 in
Pass

Maximum axial distance from header centerline to the branch cut curve.

Also computed

Short point from header CL (w_min) 3.0923 in

Minimum axial distance from header centerline to the branch cut curve.

Full saddle depth (D_s) Pass 0.22017 in

Full template depth = long point - short point.

Branch circumference (C_b) 7.4613 in

C_b = pi x branch OD.

16-mark spacing (C_b/16) 0.46633 in

Divide branch circumference into 16 equal wrap-around marks.

Drop at 1/8 mark 0.10819 in

Drop from long point at 1/8 circumference.

Drop at 1/4 mark Pass 0.22017 in

Drop from long point at 1/4 circumference.

Branch saddle template 01/81/43/81/25/83/47/81 long point short side Divide the branch circumference into 16 marks. Drops are measured from the long point along the cut curve.
Method notes 3 notes
  • This calculator lays out the branch pipe cut for centered axes. The branch centerline is assumed to pass through the header centerline.
  • Template equation: w(theta) = (-r*cos(theta)*cos(beta) + sqrt(R^2 - r^2*sin(theta)^2)) / sin(beta); drop = max(w) - w(theta).
  • This is branch saddle geometry only. It does not cut the header hole, size reinforcement, select a weldolet, include weld gap, bevel, backing, flow loss, code acceptance, inspection or shop fabrication allowances.

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