Invert level of a pipe at a given cross section refers to

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Invert level of a pipe at a given cross section refers to the

1. highest point of the internal surface
2. lowest point of the internal surface
3. highest point of the external surface
4. lowest point of the external surface

Correct Option: B

Invert level of a pipe is the level taken from the bottom of the inside pipe as shown below.The level at the crown of the pipe is the Invert level plus the internal diameter of the pipe plus the pipe wall thickness. It may necessary to use in calculations when measurements are taken from the crown of a pipe.