All equipment and even hand tools can present a risk if used incorrectly. People can be under increased pressure to finish quickly as the concrete sets so it is always worth ensuring everyone understands the operating instructions before the job starts and their job roles.
The pump has several mechanical parts and only the trained operator is allowed on the pump. The flexible rubber pipe must always be kept straight when working of the end of the boom or at the end of a ground line, if it becomes kinked all personnel should move out of the area as it is liable to kick as the pressure builds up, which may result in injury.
There is a potential for trip hazards with the pipeline layed out.