Wear the protective safety gloves, hard hat, safety boots and protective glasses. Direct contact with hot water can cause burns.
Locate the boiler blow down valve at the bottom of the boiler water column. The valve should be a quick opening valve with a lever on the top for fast operation. Refer to the boiler schematic in the boiler manual to locate the exact position of the valve. Usually it is the valve closest to the water column.
Locate a slow opening drain valve installed in the water line after the blow down valve. The slow opening valve is a ball or gate valve with a circular flange on the top.
Release the quick opening blow down valve to start the blow down.
Open the slow opening drain valve in the line to drain the water containing the sludge and scale.
Wait for 5 to 8 seconds for blow down or for the blow down time period listed in the boiler manual.
Check the water level in the tank through the level indicator provided in the column. Do not drain more than 25 percent of the water.
Close the slow opening drain valve.
Close the blow down valve to cut the water supply from the water column.
Open the slow opening drain valve again to drain the line between the blow down valve and the drain valve.
Close the slow opening drain valve and ensure all the valves are tightly shut.