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Backflow Prevention
Test Questions
| Question | Answer |
|---|---|
| What is the minimum distance of air gap for preventing blackflows? | 2x the inside diameter of the water supply outlet between the water supply outlet and the flood rim level of any receptacle that could contain a hazardous substance or 1 inch |
| What is the physical separation of the potable water supply from all sources of contamination or pollution? | Air gap |
| What is the simplest and the least expensive method for preventing backflows? | Air gap |
| What is the absolute minimum that must always be maintained between the water supply and the flood (not the overflow) of the fixture being served | 1 inch |
| What is a type of attraction, consisting of 2 mutually attractive forces: adhesion and cohesion? | Capillarity |
| What is Adhesion? | The attraction between unlike molecules such as water and plastic |
| What is the attraction between molecules such as water molecules? | Cohesion |
| It is not as common as backpressure and back siphonage, but must be guarded against. | Capillarity |
| State Regulations must equal or exceed the federal regulations T/F Chap. 3 | True |
| Containment backflow preventers are installed where? Chap. 3 | At the meter |
| What provides internal protection by having a backflow preventer at each cross connection within a consumer's property? Chap. 3 | Isolation method |
| Who is responsible for supplying water that is safe and wholesome to the public? Chap. 3 | Water purveyor |
| What is an unlawful or unreasonable use of one's own property or unlawful or unreasonable conduct that causes damage? Chap. 3 | Nuisance |
| Nobody thinks to save any of the contaminated water at the time of the backflow event. T/F Chap. 3 | True |
| Who has the basic responsibility to prevent contaminants or pollutants from entering the public water system past the point of the service meter? Chap. 3 | Consumer |
| Approved backflow tester should be required to have what? Chap. 3 | Business license and insurance coverage |
| What dictates repair procedures on backflow preventers? Chap. 3 | Manufacturer's instructions |
| What low hazards are agents that do not cause disease, but do decrease the aesthetic quality of water? Chap. 2 | Biological pollutants |
| What high hazards are agents that can cause disease? Chap. 2 | Biological contaminants |
| What creates Chloramines? Chap. 2 | occurs when ammonia is used in combination with Chlorine |
| Term used when backflow preventers are installed at each possible point of contamination Chap. 2 | Isolation or Internal Protection |
| Term used when backflow prevention assemblies are used to keep contaminants from entering the distribution system from a water consumer's facility Chap. 2 | Containment or Service Protection |
| What pollutants are substances that do not pose a public health threat, but reduce the aesthetic quality of the water? Chap. 2 | Chemical Pollutants |
| Chemical contaminants are substances that pose a ______________? Chap. 2 | threat to public health |
| _______________ refers to the poisonous nature of a chemical and varies widely. Chap. 2 | Toxicity |
| Susceptibility of individuals to chemicals is based on __________________________. Chap. 2 | the amount of the chemical present and their own health |
| Why is funding for backflow prevention programs insufficient? Chap. 2 | the cost of the program are more apparent than the benefits |
| To prevent the contaminants or pollutants from entering the public water system is the basic responsibility of the _____________? Chap. 3 | consumer |
| Who has the primary responsibility if there is a backflow incident and contaminated or polluted water ends up in the distribution system? Chap. 3 | Water Purveyor |
| What should a utility company be able to do if a customer, with a cross-connection refuses to install a backflow preventer? Chap. 3 | Authority to disconnect water services |
| Who might be held responsible for selecting the wrong type of backflow preventer? Chap. 3 | Water Purveyor, Contractor, Customer |
| Who might be responsible if the backflow preventer was installed incorrectly? Chap. 3 | Plumbing Inspector, Water purveyor, Customer, Contractor |
| Who might be held responsible if the backflow preventer is not tested at least annually? Chap. 3 | Customer, Water Purveyor |
| Who might be held negligent if the backflow preventer was not tested properly? Chap. 3 | Tester, Customer, Water Purveyor |
| Atmospheric pressure plays a major role in which type of backflow? Chap. 4 | Backsiphonage |
| According to the Ideal Gas Law, if the volume is held constant and the temperature increases, what will happen to pressure? Chap. 4 | Increases |
| How far can water be backsiphoned up a column if you have a perfect vacuum? Chap. 4 | 33.9 feet |
| Water traveling at high velocity past or through a small opening can cause backsiphonage by what effect? Chap. 4 | Venturi Effect - Bernoulli's Principle |
| How can you break or stop backsiphonage? Chap. 4 | Introducing Atmospheric Pressure |
| A water column one foot in height equals how many psi? Chap. 4 | 0.433 psi. |
| One psi equals how many feet? How many inches? Chap. 4 | 2.31 feet or 28 inches |
| Thirty seven pis equals how many feet or inches? Chap. 4 | 86 feet 1032 inches |
| A water column 86 feet in height equals how many psi? Chap. 4 | 37 psi |
| What single item at home causes the most incidents of backflow? Chap. 5 | Water hoses / Hose bibs |
| What is the appropriate height on an Air Gap? Chap. 5 | 2 x inside diameter of fill pipe but no less than 1 inch |
| What is the correct height to install an AVB? Chap. 5 | 6 inches above the highest point of plumbing system |
| What is the biggest disadvantage to the customer of using an Air Gap? Chap. 5 | Significant pressure loss |
| What protection does a PVB provide? Chap. 5 | Health Hazard |
| What is the correct height to install an RP? Chap. 5 | 12 inches from the bottom of the relief valve |
| What is the correct height to install a PVB? Chap. 5 | 12 inches above the highest point of plumbing system |
| What type of protection does a DCVA provide? Chap. 5 | Non-Health Hazard |
| What is the maximum pressure drop allowed across a DCVA? Chap. 5 | 10 psi |
| What is the minimum standard spring in the check valve #1 in an RP? Chap. 5 | 5.0 psi |
| What is the minimum spring tension on the Relief Valve in an RP? Chap. 5 | 2.0 psi |
| Name the two major requirements of an FCCC & HR Approved Backflow Prevention Assembly? Chap. 5 | In-line testable and repairable (includes SO valves and Testcocks) Must be shopped as one complete unit (approved valves are full flow characteristics) |
| Why do we install backflow preventers in parallel? Chap. 5 | To maintain backflow protection while testing the other backflow preventer and maintaining water to the customer |
| What special conditions are required when you install an AVB? Chap. 5 | No continuous pressure No valves downstream 6 in. above the highest point of plumbing |
| Under what circumstances would you only allow the use of an air gap? Chap. 5 | Imminent hazard to public health |
| What is minimum pressure drop allowed across a spring- loaded, soft seated check valve (AWWA Standard) Chap. 5 | 1.0 psi |
| Which check valve in a PVB, DCVA and RP has a minimum 1.0 psi loss specification? Chap. 5 | PVB- Only check valve DCVA- CV #1 and CV#2 RP- CV#2 |
| What is the visual difference between a DCVA and a DCDA? Chap. 5 | Bypass with a meter Smaller backflow assembly |
| What is the difference between a PVB and an AVB? Chap. 5 | AVB has only a float check and PVB has a spring loaded check valve and spring loaded air inlet valve |
| What are three basic methods for testing a check valve? Chap. 6 | Differential Duplex Sight tube |
| In TEST #3, how do you test check valve #2 in an RP? Chap. 6 | By creating a cross = connection between TC #2 and TC #4 with a bypass hose then apply supply pressure behind CV #2. If leaks relief will open |
| What type of test do you use on CV #2 in d DCVA? Chap. 6 | Direction of flow - hold back 1.0 psi. |
| What type of test do you use on the check valve in a PVB? Chap. 6 | Direction of flow - hold back 1.0 psi. |
| What type of test do you use on check valve #1 in an RP? Chap. 6 | Direction of flow - hold back 5.0 psi. |
| Where is test cock #1 located on an RP? Chap. 6 | On inlet side of #1 SO valve. Used for cleaning or repair even when water is off. |
| Where is test cock #2 located on an RP? Chap. 6 | On supply side of CV #1 and relief sensing line |
| What is maximum drop allowed across a DCVA or a DCDA? Chap. 6 | 10 psi. |
| Which shut-off valve is closed when testing a DCVA? Chap. 6 | Both shut-off valves |
| Which gauges are used when testing a DCVA or DCDA? Chap. 6 | Differential or Duplex |
| With backpressure on CV #2, what does the relief valve do? Chap. 6 | Relief opens to atmosphere and empties water |
| Water pressure fluctuation will cause the relief valve of the RP to ______________________? Chap. 6 | spit |
| Water will steadily _________________out the vent if the relief if CV #1 leaks or CV #2 leaks with backpressure from the customer. Chap. 6 | dump |
| Water will _______________ from the vent of the relief valve of the RP if there is a loss of system pressure. (backsiphonage) Chap. 6 | dump |
| What is the minimum value for the PVB air inlet valve opening? The check valve? Chap. 6 | 1.0 psi. check valve - 1.0 psi |
| When testing the air inlet opening of the PVB, you connect which hose where? Chap. 6 | High hose to TC #2 |
| What is the minimum differential pressure for CV #1 on the DCVA? Chap. 6 | 1.0 psi |
| When testing the CV #2 of the DCVA with a differential test kit, you connect which hose where? Chap. 6 | High hose to TC #3 |
| What is the last step when testing the RP? Chap. 6 | Once you record differential pressure across CV #2 , OPEN #2 SO and notify customer the water is back on |
| When observing CV #1 differential, on the RP, you connect which hoses where? Chap. 6 | High hose to TC #2 and Low hose to TC #3 |
| How do you know whether the outlet valve leaks on an RP? Chap. 7 | When operating the Low control to make the RV discharge, the gauge will not drop and make RV open meter is running hear the water |
| What causes higher-than- normal readings on CV #1 and CV #2 of the RP? Chap. 7 | Flow through the assembly |
| You closed the outlet shut-off valve and the relief valve starts to drip. What's wrong? Chap. 7 | Fouled CV #1 |
| If the sensing tube is clogged, how do you know? What does the relief valve do? Chap. 7 | During flushing of TC #2 RV opens and discharges fully until assembly SO is closed and RV is cleaned OR the relief valve will not open during RV test (trapped high pressure) |
| _______________ is a reversal of the normal direction of flow. Chap 1 | Backflow |
| A cross-connection is a ________________ between the potable water system and some other non-potable system or source. Chap. 1 | Link |
| Potable water is safe for _______________________. Chap. 1 | Consumption |
| Another term for a direct cross-connection is a ________________ cross-connection. Chap. 1 | permanent |
| Two types of backflow are ____________________ and _______________. Chap. 1 | backpressure and Back-siphonage |
| There are ____________________ essential components of an effective cross-connection control program. Chap. 1 | seven |
| Biological Low (Non-Health) Hazard: Pollutants Chap. 2 | agents that do not cause disease, but does decrease the ascetics of the water |
| Biological High (Health ) Hazard: Contaminates Chap. 2 | agents that can cause a disease |
| Chemical Low (Non-Health) Hazard: Pollutants Chap. 2 | substance that do not pose a threat to public health, reduces the aesthetics of the water |
| Chemical High (Health) Hazard: Contaminates Chap. 2 | substance that pose a threat to public health |
| Define a toxic substance. Chap. 2 | a substance that causes injury, illness or death especially by chemical means |
| Example of a biological pollutant (Non-Health hazard): Chap. 2 | Lactobacillus |
| Example of biological contaminates (health hazard): Chap. 2 | Giardia-Lamblia and Legionella |
| Example of a chemical pollutant: Chap. 2 | Iron |
| Example of a chemical contaminate: Chap. 2 | Arsenic or Mercury |
Created by:
rpickler1