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`"Rolling Offset" = "Run and Travel"[ "U" , "S" , fA ]`

Enter a value for all fields

The **Rolling Offset **calculator computes the rolling offset length of the run (**R**) and travel (**T**) based on the vertical (**U**) and horizontal (**S**) offsets and the fitting angles (**fA**) of the elbow fittings. This is also known as pipe rolling.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**U**) - Vertical offset - (
**S**) - Horizontal offset - (
**fA**) - This is the elbow Fitting Angle. (e.g. 22.5°, 30°, 45^{o}, 60^{o}, 90^{o})

**Rolling Offset (R & T):** The calculator returns the run (R) and travel (T) in inches. However, these can be automatically converted to other length units (e.g. centimeters or feet) via the pull-down menu.

When running pipes or conduits, it is common to have to change the run of the line of pipes by using two equal angled elbow fittings (see diagram). The length of the run (R) and travel (T) created with the elbows and the length of pipe between them, can be calculated if one knows the vertical and horizontal offsets and the angle of the fitting. To compute the Rolling Offset Travel and Run (aka pipe rolling), the relationship between the travel length and the offsets is as follows:

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

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

`R = sqrt(T^2 - x^2)`

where:

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.

- 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).
- Pipe Grading - The amount of drop needed over a run to maintain a specified grade
- 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**. - 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.