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Water Distribution
| Question | Answer |
|---|---|
| Causes taste problems and has a rotten egg odor | Hydrogen sulfide |
| The pumping water level is best defined as the distance from the top of the well to the | water after the pump has been operating for a period of time |
| A weir should be used to measure water in what locations? | open channels |
| Most important reason for maintaining a continuous positive pressure throughout the distribution system? | Prevent contamination from backflow |
| Sodium hypochlorite should be stored where? | Away from equipment that is susceptible to corrosion |
| pH range that would deposit a thin film of calcium carbonate on the inside surface of a pipe? | 8.0-9.0 |
| The process of adding chlorine to water until the chlorine demand has been satisfied is called? | Breakpoint chlorination |
| Chlorine is most effective at destroying bacteria when the pH level is what? | 7.5 |
| What is the purpose of grouting a well? | Prevents contamination |
| The melting point of a chlorine cylinder fusible plug? | 158 to 165 degrees F |
| Connects a service line to the water main | corporation stop |
| Specific gravity of chlorine gas | 2.5 |
| Prevents the well wall from collapsing | casing |
| The water bearing layer of porous soil or rock under the ground is called | aquifer |
| Difference between static level and pumping level in a well | drawdown |
| The water table is defined as | the upper level of zone saturation |
| When setting up a one ton chlorine container | the valves must be oriented vertically |
| Indicates a chlorine leakage in a chlorine room | red and green deposits on metal |
| The influx of sand into a well can be minimized by using | a screen |
| This is not a concern when water pressures in a distribution system is excessively high | excessive foaming |
| Problems resulting from excessively high pressure in a water distribution system | customer complaints, service line leaks, decreased life of customer water heaters |
| The vent for ventilating a chlorine room should be located | near the floor |
| The best time to flush water mains | late at night |
| When chlorine is being drawn from a one ton container through the lower valve, what piece of equipment must be used prior to the injector? | evaporator |
| How many pounds of chlorine gas can be removed from a one ton chlorine container in a 24 hour period? | 360 lbs |
| Sometimes applied to the inside of steel chemical storage tanks to prevent corrosion? | rubber |
| When evaporated, one volume of chlorine liquid will form approximately how many volumes of chlorine gas? | 450 |
| This pump should never be started with the discharge valve closed? | piston |
| The type of drawing an operator would use to determine if a water line crosses over or under another utility line? | elevation view |
| Prevents water supply contamination | backflow preventer |
| Indicates the empty weight of a chlorine cylinder | tare weight |
| Chemical used to locate chlorine leaks | ammonia |
| SCBA stands for | self contained breathing apparatus |
| Where should SCBA be kept in preparation for a chlorine emergency? | Immediately outside the chlorine room. |
| Location of the fusible plug on a 150 lb chlorine cylinder | on the valve |
| How many pounds of chlorine gas can be removed from a 150 lb chlorine container in a 24 hour period? | 38 lbs |
| Galvanic corrosion occurs when | two dissimilar metals are in contact |
| RPZ backflow preventer must be | must be mounted at least 12" above the surface |
| Probes, floats and bubbler tubes are used for | detecting liquid level |
| A loss in pump efficiency could be caused by | worn impeller |
| When flushing a water main, where would you measure the residual pressure? | nearest hydrant |
| Properties of chlorine gas | greenish-yellow, oxidizer, inhalation hazard |
| When evacuating a chlorine leak area you should | Keep your head high and move upwind of the leak. |
| Primary consideration in determining the size of a municipal water distribution system | fire flow requirements |
| If a one ton chlorine container is leaking, you should | Rotate the container so gas escapes instead of liquid. |
| When using the air gap method of backflow prevention, the distance from the inlet potable water line and the overflow level of the non-potable container must be | at least two inlet pipe diameters distance |
| Most important thing to check before starting a gasoline powered engine | oil level |
| The packing gland on a pump with packing, should be adjusted so the leakage | equals about one drop per second |
| The "C" factor and "f" factor of a pipe refer to | the smoothness of the inside of the pipe |
| When lubricating an electric motor, excess grease increases | temperature |
| To measure the flow of chlorine gas you would likely use a | rotameter |
| Electrical current flow is measured in | amps |
| Electrical potential is measured in | volts |
| Part of a pump that keeps water in the volute and keeps air out is | packing |
| Closing a valve too quickly can cause | water hammer |
| Simplest form of flow measurement | weir |
| Internal leakage in a centrifugal pump volute is minimized by using | wear rings |
| Three types of water distribution layouts | grid, tree, and loop |
| Unit for measuring blower performance | cfm (cubic feet per minute) |
| If a centrifugal pump has a small amount of leakage around the pump packing, this indicates that | the packing is being lubricated |
| Why should water hammer be avoided? | It can cause pipes to break |
| Valve that allows flow in one direction | check valve |
| Electric motors should be cleaned by | blowing with compressed air |
| A valve that should not be used to throttle flow | gate valve |
| What unit measures electrical power? | watts |
| The center of the inside bottom of a pipe is called the | invert elevation |
| Measures the rotational speed of an electric motor shaft | tachometer |
| Usually the first part to wear out on a reciprocating pump | packing |
| Installed to control water hammer | surge chamber |
| Used to compensate for slight misalignment between a centrifugal pump and the motor shaft | flexible coupling |
| The ability of water to neutralize acids is called | alkalinity |
| Scale build up inside a pipe will cause | headloss |
| pH measures the | concentration of Hydrogen ions |
| Minimum pressure a distribution system should maintain, even under fire flow demands | 20 psi |
| The device used in checking water flow to consumers is a | water meter |
| This type of meter has no moving parts | venturi |
| A customer's service is usually measured with what type of meter? | positive displacement |
| Reagent used to measure chlorine residual in water | diethyl-p-phenylendiamine (DPD) |
| The rotating element in centrifugal pumps is called the | impeller |
Created by:
jeffwhite
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