If the center line elevation of a 12'' schedule 40 pipe is 203'- 1 1/2'', what is the elevation of the BOP?

To determine the elevation of the Bottom of Pipe (BOP) for a 12-inch schedule 40 pipe, it is essential to understand the diameter of the pipe and how it affects the centerline elevation.

The nominal diameter of a 12-inch pipe does not correspond to its actual outside diameter. For schedule 40, the outside diameter of a 12-inch pipe is approximately 12.75 inches.

The centerline elevation of the pipe given is 203 feet and 1.5 inches. To find the BOP, you need to subtract half the outside diameter of the pipe from the centerline elevation. Since the outside diameter is approximately 12.75 inches, half of this is about 6.375 inches.

When converting 6.375 inches to feet, we divide by 12, which gives us approximately 0.53125 feet. This can be added to the centerline elevation for easier calculations:

1. Convert the centerline elevation to inches:

   • 203 feet × 12 = 2436 inches
   • Add 1.5 inches to get a total of 2437.5 inches.

2. Subtract half the outside diameter (6.375 inches):