Q:

How do you calculate pipe offset?

A:

Quick Answer

A pipe offset is calculated when a pipe is altered in both the vertical and horizontal planes of a piping system. This type of occurrence is known as a "rolling offset." Following Pythagoras' theorem, the first number, or true offset, is calculated by taking the offset squared and adding the rise squared to obtain the true offset squared. Take the square root of the answer to obtain the offset.

Continue Reading

Full Answer

Once the true offset is known, the pipe fitter can utilize a table to find out the setback and diagonal center. Most fitting constants are 45 degrees in the plumbing trade. If the fitting angle is 60 degrees, the diagonal for the pipe is equal to the true offset times 1.155. If the fitting angle is 45 degrees, the true offset is multiplied by 1.414 to obtain the diagonal. For any fitting angle that is 22.5 degrees, the true offset is multiplied by 2.613 to get the answer for the diagonal.

The setback for fitting a pipe equals the true offset multiplied by 0.577 for a fitting angle of 60 degrees. The true offset multiplied by 1.000 equals the setback for a 45-degree fitting angle. Multiply the true offset by 2.414 for the setback for a 22.5-degree fitting angle. Using the above calculations, the true offset for a 45-degree fitting is 14.42 inches and the same number for the setback.

Learn more about Plumbing
Sources:

Related Questions

  • Q:

    What is a basic septic tank system layout?

    A:

    A basic septic tank system layout includes a pipe leading from the house to the septic tank, an underground tank and a drain field. Most residential septic tank systems use gravity to move the water through the system.

    Full Answer >
    Filed Under:
  • Q:

    How does a toilet syphonic system work?

    A:

    A toilet syphonic system uses water displacement to create a vacuum that sucks the contents of the toilet bowl down into the waste pipe. Toilets equipped with a syphonic system have a rubber diaphragm connected to the flushing handle. Pressing the handle lifts the diaphragm, moving a quantity of water from the tank into the bowl. The influx of water pushes the bowl's contents into the waste pipe.

    Full Answer >
    Filed Under:
  • Q:

    Where does water go after it goes down the drain?

    A:

    If a home or building is on a city sewer system the draining water flows through the home's plumbing and into a single pipe that ultimately leads to the city's wastewater collection system. The water is then pumped into a treatment plant.

    Full Answer >
    Filed Under:
  • Q:

    How can you install bathtub and shower plumbing?

    A:

    To install bathtub and shower plumbing, expose the studs and piping in the shower walls. Locate the cold and hot water supply lines. Use CPVC pipe or copper tubing to run new water lines, and mount a mixing valve to this. Extend these lines up to where the shower head and bathtub faucet are located. Fit a shower head onto the end of the shower line, and mount a tub spout over the piping.

    Full Answer >
    Filed Under:

Explore