Thrust blocks shall be used

Thrust blocks are not designed to address the buoyancy of empty pipes. While buoyancy can be a concern in certain scenarios, the primary function of thrust blocks is to manage the thrust forces generated during directional changes in the pipe, rather than to prevent floating when pipes are not filled with fluid.

While thrust blocks do provide stability, their primary purpose is not to restrain movement in mechanical joints but rather to mitigate the thrust forces from fluid flow changes. Mechanical joining systems typically have their own methods for ensuring stability and integrity, which do not involve thrust blocks directly.

Thrust blocks are not universally required at all hydrants. Their use is specifically determined by the design and layout of the piping system, particularly in cases where there are significant directional changes. Not every hydrant will necessitate thrust blocks, especially in straight runs of pipe.