21 JANUARY 2003
Figure 5.5. Pressure Relief Valve (50AF-2).
5.7.2. Pressure Setting. The 50AF-2 should be set at 10 psi above normal inlet pressure to the
90AF-8 (typical settings are in the range of 110 to 125 psi).
5.7.3. Recommended Setting Procedure for the Refueling Control (90AF-8) and Pressure Relief
22.214.171.124. Set up system to refuel through the 90AF-8 valve.
126.96.36.199. Ensure a gauge is installed at the farthest hydrant outlet.
188.8.131.52. Be sure the CDHS-3 is in the cocked position.
184.108.40.206. Bottom both CRLs (90AF-8 and 50AF-2).
220.127.116.11. Energize the system and establish a smooth flow.
18.104.22.168. Adjust the 90AF-8 CRD until the gauge at the farthest outlet reads 105 psi.
22.214.171.124. Back off on the 90AF-8 CRL until the gauge needle dips (2 to 3 psi is acceptable).
126.96.36.199. Adjust the 90AF-8 CRD until the gauge at the outlet reads 100 psi (note the 90AF-8 inlet
188.8.131.52. De-energize system.
184.108.40.206. Close a manual valve downstream of the 90AF-8 and shut off the 90AF-8 solenoid
220.127.116.11. Energize the system.
18.104.22.168. Back off on 50AF-2 CRL set screw until the valve starts to open and the inlet pressure is
10 psi above the normal inlet pressure recorded in paragraph 22.214.171.124 above.
126.96.36.199. De-energize the system.
188.8.131.52. Open the manual valve and turn on the solenoid switch (paragraph 184.108.40.206).