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• NORMAL OPERATION: • OPERATION AND PURGING a There are four ball valves on the tank. In normal operation, only the valve at the top of the tank should be open — the other three valves should be closed. All valves should be locked in the above positions. DRAINING THE BLADDER: ❑ An inspection of the need to drain the bladder is easily made by removing the plug at the tee on the bottom plumbing of the tank — be sure to have a metal container available to catch fluid. With the plug removed and the container in place, carefully open the ball valve above the tee to release any liquid. Any liquid coming over from the vent system would have collected above the valve in the riser pipe before going into the bladder. If liquid in excess of 5 ounces (.04 gal./ft.) per foot of one inch (1") pipe above the ball valve drains out, the bladder should also be drained. Use caution as the storage tanks could be slightly pressurized. ❑ Should it be necessary to drain the bladder: 1. Close the upper ball valve (usually open) leading to the tank vent lines. 2. Open the valve that goes to the vertical riser that enters the top of the tank (the one without the ball valve going into the tank). Be sure the other three ball valves that connect to the vent lines and tank are closed. 3. Remove the plug from the bottom tee and connect an explosion proof evacuation pump capable of handling liquid. Have a liquid tight, metal container to receive any fluid that may exit the system and start the pump. if no liquid return within 30 seconds, the bladder is dry -- discontinue pumping, remove the pump, replace the plug and return the ball valves to their original, locked, positions. DRAINING THE TANK: Q Should it be necessary to drain the tank (between the bladder and steel wall): 1. Close the ball valve at the top of the tank and also the two valves on the vertical risers. 2. Remove the plug in the bottom tee and place a metal container below the pipe opening. 3. Carefully open the ball valve at the bottom of -the tank — observe that the container that is being drained into does not overflow — empty container as required until fluid no longer comes from the pipe when the valve is open. 4. Close the ball valve and replace the plug into the tee. 5. Return all ball valves to their original locked positions. Healy Systems, Inc. RECOMMENDS DRAINING THE BLADDER AND TANK ANNUALLY. CAS 7104 cg