OSHA

Occupational Safety and Health Administration

Other Sewer Structures

Other portions of the industrial sewer pipelines and manholes, including trap tanks, sumps, and any other structure not specifically identified.

Outfall

An outlet to a sewer system.

Ovality

There are two options: a) the difference between the maximum and mean diameter divided by the mean diameter, and b) the difference of the mean and minimum divided by the mean, at any one cross section of a pipe, generally expressed as a percentage.

Overcut

The theoretical difference between the radial measurement of the gauge cut and the MTBM shield; equal to (Gauge CutThe outermost projection of the excavation, measured as a diameter. The gauge cut is subject to cutter wear and to the differential cut. OD – MTBM OD)/2. Actual overcut is reduced as the gauge cutter is worn and because of the differential cut.