Figure 8 Dry dump gunJetting guns should be fitted with double-action safety trigger mechanisms to prevent inadvertent operation. High pressure jetting guns or lances should be maintained by a competent person in accordance with the manufacturer’s recommendations. Guns or lances should be inspected and tested before each use with particular attention being given to checking:• the correct operation of the trigger mechanism and guard• the hose connections and threads• the nozzle holders and seals• the hose is secured to the gun by a braided stocking • an impervious over hose shroud is fitted, and• the handle or shoulder stock is fitted as required by manufacturer’s instructions.The gun and shut off mechanism should also be tested under low pressure to ensure correct operation.
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