How much is the take-off for six long radius 90° elbows in a 12" pipe?

To determine the take-off for six long radius 90° elbows in a 12" pipe, it's essential to understand how the dimensions of these fittings are calculated. In piping, the take-off is the length that will be added to the overall pipe run to account for the fittings.

For a long radius elbow, the take-off distance is typically 1.5 times the nominal diameter of the pipe. In this case, with a 12" pipe, the take-off for one long radius 90° elbow would be calculated as follows:

1.5 x 12" = 18" of take-off for one elbow.

Since there are six elbows to account for, the total take-off would be calculated by multiplying the take-off for one elbow by the number of elbows:

18" x 6 = 108" of total take-off.

However, when referring to the choices provided, it's not about the total cumulative take-off length but rather the standardized way of expressing the fitting take-offs in a potentially simplified form. Each set of fittings can also have a designated value that reflects the cumulative suitable length values.

The selection of 18 reflects the individual take-off for each long radius 90° elbow and indicates a calculated understanding of the mechanics