Civil Engineering PE

Answer: A - The purpose of thrust blocks is to prevent pipe movement when a pressure system is activated and pressurized. Typically, thrust blocking is required at all points where the direction of a pressure pipe changes. Thrust blocking is normally required where fittings, valves, and hydrants are installed. Concrete is commonly used for blocking, and the size of the block is based on pipe size, working pressure, fitting type, degree of directional change, and local soil conditions.