# Thrust Block

Written by Matt Milbury. Posted in Pipe Fittings

A thrust block, abbreviated as TB, is an obstacle for the pressure against a change in direction of a pipe by a elbow, etc. The soil or substance must be capable of maintaining the thrust force. The thrust pressure comes from internal pressure in the line acting on fittings.

## Formula

$$A_{TB} = \frac { F } { p }$$

Where:

$$A_{TB}$$ = area of thrust block

$$F$$ = thrust force

$$p$$ = allowable soil bearing pressure

Solve for:

$$F = A_{TB} \cdot p$$

$$p = \frac { F } { A_{TB} }$$