To avoid injury to workers/staff , it is recommended  that all personnel should remain a prudent and reasonable distance from the end of the delivery line until air is exhausted from the system and concrete is free flowing once more.

Some Safety Bulletins recommend workers/staff to stand beyond the end hose movement area.  The end-hose movement area is defined as the area within the radius of the last flexible (nonsteel) piece of delivery system. For example, if 4 m of rubber hose is attached to a pipeline, personnel standing more than 4 m away from the point of attachment are outside of the end-hose movement area.”

Debris coming from the hose during release of trapped compressed air also can be a hazard, so personnel should always wear protection equipment such as a hard hat/helmet and eye protection.