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# Rolling Offsets (travel)

KurtHeckman.Rolling Offsets (travel)

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.

* 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

- Rolling Offsets (Run) – The Rolling Offset (Run) function computes the run length a rolling offset based on the offsets and fittings. (see diagram).
- Rolling Offsets (Travel) – The Rolling Offset (Travel) function computes the travel pipe length a rolling offset based on the offsets and fittings. (see diagram).
- Diagonal of a Square - This is a simple calculation to assist in computing the diagonal of a square.
- Diagonal of a Box - This computes the length of the diagonal of a box (
**T**) based on sides of length**R, S**and**U**. - Counting the number of smaller diameter pipes are needed to match the flow of larger pipes.
- Flow Rate - This computes flow rate based on the total volume and the time it took to accumulate.
- Pipe Flow Volume - This computes the total volume from a pipe based on the flow rated and the duration of flow.
- Volume of a Pipe
- Weight of Pipe Contents: Default is water. Also see Weight of sea water in pipe
- Volume of a Cylindrical Container (e.g. hot water tanks),
- Weight of Water in a Cylindrical Tank (e.g. hot water tanks),
- Volume of a Spherical Container,
- Weight of Water in a Spherical Container
- Volume of a Rectangular container
- Weight of Water in a Rectangular Container, and a
- Capillary Rise - The height of water in a small tube due to capillary force.
- Snow Water Equivalence - The volume of water created by an area and depth of snow.
- Pore Water Pressure - Pressure of uplift from the water table.
- Pressure Head - The Potential Gravity-Fed Water Pressure from a Tank (a.k.a. Pressure Head) equation calculates the water pressure that can be realized below a tank based on the height of storage.

**Rolling Offsets (travel)**, is used in 7 calculators and 2 equations/constants.

**Calculators**

**Equations and Constants **