Backflow Prevention Devices and Systems, Exams of Advanced Education

Download Backflow Prevention Devices and Systems and more Exams Advanced Education in PDF only on Docsity! CROSS CONNECTION PRACTICE EXAM The Check Valves of a Double Check Valve Assembly must be: Internally Loaded Which of the following backflow preventers offers effective protection under backsiphonage conditions only and can also be subjected to constant full line pressure? Spill Resistant Type Pressure Vacuum Breaker To appropriately resolve a cross connection contamination incident, a qualified tester or specialist should: Identify and isolate the source of contamination, Identify and isolate the affective area. Notify the customer, as well as, the health department Which of the choices is best described as "a flow of water or other liquids back into the potable water supply due to a negative or reduced pressure in the supply piping?" Backsiphonage A residential "partial flow through" type fire sprinkler/ standpipe system is designed to circulate water in what portion(s) of the water system? Sprinkler system main The factory loaded spring tensions of the first and second check valves found in a Reduced Pressure Principle Backflow Assembly are always Pre loaded different from one another An Approved Air Gap must be: Twice the pipe diameter with a minimum of 1 inch separation Upon completing test number one of a Double Check Valve Assembly, when using a differential pressure gauge, in what position are the shut off valves for the next test? Shutoff valve #1 is open and shutoff valve #2 is closed According to the AWWA Canadian CCC manual, the minimum vertical distance from the bottom of a RP's relief valve to the finished floor level should be? 300 mm (12") The Dual Check Valve can be used to isolate which one of the following applications? Residential potable water systems with a minor degree of hazard During the field test of a Reduced Pressure Principle Backflow Assembly, it may be possible to compensate for a leaking number two shutoff valve by attaching a temporary bypass hose from: Test cock number one to test cock number four Backflow prevention assemblies shall be field tested to a minimum of: Annually To what maximum centerline height (from the finished floor) must testable backflow preventers be installed before a fixed platform is to be provided below the assembly? 1500 mm (5') Which backflow preventer contains a float check, a check seat and an air inlet poppet? Atmospheric Vacuum Breaker What (if any) is the backflow concern for a bakery which aspirates food additives into a vessel in a preparation area? The substance may deteriorate and become a health concern The Pressure Vacuum Breaker Assembly may be used for backflow protection for which of the following conditions? Backsiphonage; severe hazard How many test cocks are there on a Spill Resistant Type Pressure Vacuum Breaker Assembly? One When field testing a Pressure Vacuum Breaker Assembly installed close to a ceiling, the gauge should: Be placed at the same level as the assembly During the first test of a Double Check Valve Assembly, it is found that water continually runs from open test cock #3. The bleed off valve arrangement is opened and after a moment the water stops running out of the open bleed off valve arrangement, but continues to flow from test cock #3. What is the most probable problem? Shutoff valve #2 and check valve #2 are leaking with backpressure The spring in the relief valve of a Reduced Pressure Principle Backflow Assembly is designed to: Open the relief valve When non-toxic antifreeze chemicals are added to a fire suppression system, which of the following is required to protect the potable water supply? Reduced Pressure Principle Backflow Assembly The accuracy of differential test gauges used for field testing should be checked: On a annual basis A certified backflow assembly tester, is required to report backflow prevention field test information to the: Lye is backsiphoned from an open vat (without a cover on the top) in the production of concrete by a direct cross connection. This would constitute a: Severe Health Hazard During a field test of a Pressure Vacuum Breaker Assembly, the air inlet valve must open: At or above one psid When repairing a Double Check Valve Assembly, the tester should NOT: Modify internal components A Pressure Vacuum Breaker Assembly may be installed with a/an ____________ downstream of the assembly. Shut off valve Adequate support blocks are required for backflow prevention assemblies over _____ inch in size. 2 Backflow in a public water supply can be caused by: Backpressure and Backsiphonage What type of backflow preventer is recommended for premise isolation on a food processing plant? Reduced Pressure Principle Backflow Assembly The primary concern to the water purveyor, when an auxiliary water supply is utilized, or maintained, is to ensure that: Backflow protection is provided at the water service connection The relief valve of a Reduced Pressure Principle Backflow assembly discharges in a static or no flow condition and stops discharging during a flow condition. The most likely cause is Fouled number one check valve An absolute pressure of 25 psia, at sea level, is equal to approximately what gauge pressure? 10 psig A marine facility uses a Reduced Pressure Principle Backflow Assembly for premise isolation. What is the minimum level of additional protection on the water service at each pierhead outlet? Double Check Valve Assembly A perfect vacuum (at sea level) will raise water in a pipe a maximum of what height? 33.9' What type of service protection is required on a single family dwelling? No protection is required An Atmospheric Vacuum Breaker must be installed: Six inches above the highest outlet and downstream piping When field testing a Double Check Valve Assembly, check valve number one is found to be leaking. The next step is to: Test check valve number two A two inch Atmospheric Vacuum Breaker, when used on irrigation systems, shall be installed at least _________ inches above the downstream piping. Six An increase in temperature, in a closed plumbing system, would be an example of: Thermal expansion According to the CAWWA manual, what is the minimum height that a RP is to be installed, measured from the centreline of the assembly to the floor 750 mm (30") What could the tester do if shutoff valve #1 is found to be slightly leaking during the first test of a Double Check Valve Assembly? Compensate for the leaking valve by opening the bleed off valve arrangement At what minimum pressure (psid) must the relief valve of a Reduced Pressure Principle Assembly open, in order to pass its requirement? 2.0 Results of a backflow preventers field test, need not include: date of manufacture A complete cross connection control program should be coordinated with: Plumbing Inspections b) Local Health Department c) The Water Purveyor Upon the installation of a RP, the number 1 shutoff valve is opened at which time the differential pressure relief valve starts to continuously discharge. What is the most probable cause? A fouled number one check valve A Full Flow Through fire sprinkler system would require which type of backflow protection? No protection would be required Where should Hose Bib Vacuum be located? On hose bibs as required by code What is the maximum number of days a tester has to submit a test form on a backflow preventer? Within 30 days By opening the high side, then the low side control valves on a properly functioning Reduced Pressure Principle Assembly (after attaching and bleeding the test equipment) will cause: The differential to decrease Where is it not permissible to install an Air Gap? Where the atmosphere maybe contaminated Where the use of an Approved Air Gap is impractical, which of the following backflow preventers is permissible in its place? Reduced Pressure Principle Backflow Assembly All backflow preventers must: Be installed with adequate access The bypass line on a double detector check valve assembly is designed to: Detect unauthorized usage of water When flushing the test cocks of a Reduced Pressure Principle Backflow Assembly, the number two test cock must: When flushing the test cocks of a Reduced Pressure Principle Backflow Assembly, the number two test cock must: When is it permissible to install a bypass around a Reduced Pressure Principle Backflow Assembly? When the bypass is fitted with a RP When is it permissible for an Atmospheric Vacuum Breaker to have a downstream shutoff valve? The AVB may not have a downstream shutoff valve During the first test on a Double Check Valve Assembly, it is found that water continues to leak out of open test cock #3. Upon opening the bleed valve, the water from the bleed valve runs and eventually stops, yet water continues to flow from test cock #3. What is the most probable cause? Backpressure is present, check valve #2 is fouled, shutoff valve #2 is fouled Specifications of Reduced Pressure Principle Backflow Assemblies require that the differential pressure across check valve #1 is _______ psid greater than the opening point of the relief valve. 3.0 During test #2 of a Double Check Valve Assembly (using a differential pressure gauge), it is observed that the water level in the sight tube is receding. What is the most probable cause? Shutoff valve #2 is leaking with no downstream pressure