Backflow Prevention And Cross Connection Control Study Guide Questions And Correct Answers

During PVB Air Inlet Test, Air inlet valve does not open, as field test kit drops to 0.0 psid. What does this indicate? {Ans: 1. Air inlet disc stuck to seat 2. Broken or missing air inlet spring 3."O|d style" pressure vacuum breaker (non- loaded air inlet valve) 4. It is an SVB (See Book 9.5)}What is the purpose and requirement of the SVB ) Spil-Resistant Pressure Vacuum Breaker Assembly) Test # 1: Tightness of Check Valve (USC 10th ed pg 308)? {Ans: Purpose: To determine the static differential pressure across the check valve. Requirement: The static differential pressure across the check valve shall be at least 1.0 psid.}During SVB (Air Inlet Opening Point) Test 2, water runs continuously from vent screw valve. What does this indicate? {Ans: 1. Leaking No. 1 shutoff valve}When testing the RP backflow device, and while observing the gauge, and introducin HP water behind the #2CV (RP Test Procedure 2, Step 3), and the RV begins to discharge, what action(s) do you take to troubleshoot the equipment? {Ans: 1. You have a leaking # 2 Check Valve 2. Proceed by reestablishing and give the #2CV a second chance, if discharge continues