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-10- 7.3 If the station vacuum is less than —2.00" we (from Section 7.2), or at the direction of district (refer to Section 2.2), conduct the following: 7.3.1 Close the ball valves marked "A" and "B" from Figure 2. 7.3.2 Open the ball valve marked "C" from Figure 2. 7.3.3 Open the ball valve of the Test Port Assembly and flow nitrogen into the Clean Air Separator bladder at a flow rate between 2 and 4 CFM until the pressure in the bladder reaches 2.20" wc. 7.3.3.1 Depending upon the nitrogen flow rate used, the bladder could take up to 30 minutes to fill completely. 7.3.3.2 Because of the close proximity of the pressure measurement device to the nitrogen inlet of the Test Port Assembly, the pressure measurement device may read a higher pressure when nitrogen is flowing. The pressure measurement device is usually steady, but will start to increase rapidly when the bladder is getting full. 7.3.3.3 Periodically stopping nitrogen flow will provide an accurate reading of the pressure in the bladder. 7.3.4 Once the pressure reaches 2.20" wc, shut off the flow of nitrogen to the Clean Air Separator bladder and close the ball valve of the Test Port Assembly. 7.3.5 Wait 5 minutes or until pressure stabilizes. 7.3.6 Use the needle valve on the Test Port Assembly to bleed off the nitrogen until the pressure reaches 2.00" wc. Make sure the needle valve is closed. Record the pressure. 7.3.7 Start the stop watch to begin a 5 minute decay. 7.3.8 Record the pressure in one -minute increments up to 5 minutes. 7.3.9 If the pressure in the bladder is greater than 1.77' we at the end of 5 minutes, then the Clean Air Separator passed the test. 7.3.10 If the pressure in the bladder is less than 1.77' we at the end of 5 minutes, then the Clean Air Separator failed the test. 7.4 If the bladder was evaluated using the vacuum procedure (Section 7.2), close the ball valve "C" to keep it in a vacuum condition. If the bladder was evaluated using the pressure procedure (Section 7.3), open the needle valve on the Test Healy Phase 11 EVR System Including Veeder-Root ISD, Exhibit 4 — VR -202-A