Section 20-2. High-pressure jetting with assistant operator

When the conditions indicate that the operator has limited control of the pumping unit, or if otherwise required because of the working conditions, an assistant operator shall keep the pumping unit under observation.
It must be possible for the operator who is in control of and operates the pumping unit to communicate or preferably have visual contact with the operator that operates the jetting device.
The operator that controls the jetting device shall act as team leader and communicate with the assistant operator by means of agreed signals.