Rolling Offsets (travel)

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Equation / Last modified by KurtHeckman on 2019/04/05 17:06
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KurtHeckman.Rolling Offsets (travel)
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The Rolling Offset Travel calculator computes the length of travel (T) or pipe to be cut based on the vertical (U) and horizontal (S) offsets and the angle of the elbow fitting.  

plumbing1.png      Rolling Offset  of pipes 
INSTRUCTIONS: Choose the preferred units and enter the following information:

  • (U) - Vertical offset
  • (S) - Horizontal offset
  • (fA) - Fitting angle.  This is the angle of the elbow fitting on either side of the travel pipe. The most common fitting angles are 22.5°, 30°, 45°, 60°, 90°

Travel (T): The calculator returns the Travel (T) in inches.  However, this can be automatically converted to other length units (e.g. centimeters) via the pull-down menu.

Related Calculators:

  • To compute the Rolling Offset (run), (R) in the diagram, CLICK HERE.

General Information

When running pipes or conduit, it is common to have to change the run of the line of pipes by using two equal angled elbow fittings (see diagram).  In this case, the amount of pipe needed between the fittings is called the travel, T in the diagram.  The travel (T) can be calculated if one knows the vertical and horizontal offsets and the angle of the fitting.  

Derivation

In the diagram above, the relationship between the travel length and the offsets is as follows:

                                             ` x = sqrt( U^2 + S^2)`

                                              ` T = x / cos (90 - fA)`

Note: vCalc allows for multiple units for both length (SI and English) and for angles (degrees and radians).  The result will be in inches.  However, this can automatically be converted to other length units (e.g. centimeters) with the pull-down menu.

General Plumbing Calculators