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I ARB Approved IOM — Executive Or* VR -201 -D and VR -202-D (CAS — 996 1) Page 22 OPERATION AND PURGING Li There are four ball valves on the CAS. Each ball valve is to be installed so as to allow opening and closing with nothing obstructing the full range (900) of movement. In normal operation, only the valve (A) at the top of the CAS shall be open — the other three valves (13, C and D) shall be closed. All four valves shall be locked in the above positions. The two plugs (E and F) should be installed using a non -hardening, UL classified pipe joint compound and tightened to 60 ft -lbs. X-J-1110MR142 go 1:84 W-11 Q 11:1 o Any liquid coming over from the vent system would have collected above the valve (A) in the riser pipe before going into the bladder. An inspection of the need to drain the bladder is easily made by removing the plug (E) at the tee on the bottom plumbing of the CAS. Before removing this plug, open the valve (B) above the tee to release any liquid into the piping below. Wait approximately 30 seconds and then close the valve (B). Now, remove the plug (E) at the tee on the bottom plumbing of the CAS — be sure to have a container suitable for gasoline available to catch fluid. If liquid in excess of 16 ounces (473 ml) drains out, the bladder should also be drained. o Should it be necessary to drain the bladder: 1. Close the upper ball valve (A) (usually open) leading to the gasoline storage tank vent lines. 2. Open the valve (C) that goes to the internal syphon tube. Be sure the other three ball valves (A, B and D) that connect to the vent lines and CAS are closed. 3. Remove the plug (E) from the bottom tee and connect an explosion proof evacuation pump capable of handling liquid. Have a liquid tight, container suitable for gasoline positioned to receive any fluid that may exit the system and start the pump. If no liquid returns within 30 seconds, the bladder is dry — discontinue pumping, remove the pump, replace the plug (E) and return the ball valves to their normal, locked, positions. Li Should it be necessary to drain the CAS (between the bladder and steel wall): 1. Close the ball valve at the top (A) of the CAS and also the two valves (B and C) on the vertical risers. 2. Remove the plug (E) in the bottom tee and place a metal container below the pipe opening. 3. Carefully open the ball valve (D) at the bottom of the CAS — 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 (D) and replace the plug (E) into the tee. 5. Return all ball valves to their normal locked positions.