SPDI2 Flashcards
What is the most important reason for backfilling a trench after pipe installation?
eliminate a safety hazard if left open
What wall thicknesses are available in copper tubing for drinking water?
K, L, M, DWV
Galvanization provides a pipe with what benefit?
Reduces corrosion
What fitting joins pipes so they can be taken apart later?
Union
How do street elbows and standard elbows differ?
Street elbows have one female and one male end
How do copper pressure fittings differ from copper drain, waste, and vent (DWV) fittings?
Pressure fittings have a deeper solder pocket
What is the smallest increment on most of the tape measures in our trade?
Sixteenth inch
What is the next largest sixteenth-inch mark after ¾?
13/16ths
What kind of tape measurer can you use to determine the travel when the offset angle is known to be 45 degrees?
plumbers rule
How do you determine the center of a fitting?
By finding where lines drawn through the fitting intersect
An end-to-center measurement is made from the?
End of pipe to center of fitting
When cutting tubing with a tubing cutter, how far do you turn the handle after each revolution?
1/4 turn
To remove the burr from inside a piece of pipe, operate the handle of the reamer with?
Short, even, clockwise strokes
What diameter steel pipe sizes are able to thread with a nonadjustable ratchet style hand threader?
1/8 - 2 inches
When threading steel pipe with a hand threader, how often do you apply oil to the pipe dies?
Apply oil every two or three downward strokes of the die handle
What is the purpose of oiling while threading the steel pipe?
Prevents the dies and threads from overheating and becoming damaged
When threading a fitting on a pipe, what happens if you overtighten a fitting?
The fitting stretches and the joint leaks
What size pipe wrench do you use on a ¼ inch pipe?
8 inch (200 mm)
What preparation must you make to produce a good bond between the base metal and the solder in a copper soldered joint?
The metal surfaces must be perfectly clean at the joint
How much solder is needed to solder a ½ inch connection?
1/2 inch
When using a lever type tubing bender, you can make angles up to how many degrees?
180 degrees
What action creates an watertight and airtight seal on a ferruled joint?
Tighten the nut which crimps the ferrule into the tubing and against the fitting
What is one disadvantage of the no-hub drainage system?
Support around the pipe may be required
When solvent welding plastic pipe, how do you insert the pipe into the fitting?
Quickly insert the pipe into the fitting with a onequarter turning motion
How is large underground plastic pipe joined?
O-ring joints
What are two types of pumps used in booster stations?
Deep well and split case
What is the reason we use elevated storage tanks in water systems?
Elevated storage tanks provide cheap pressure
What element of a water meter translates the action of the water flow?
Secondary
What is the minimum burial depth for water mains under roads?
3 feet (0.9 m)
What is the part of the water distribution system main and extends into the building?
Water service lines
Before a new water main is put into service it must be?
Tested and disinfected
A kind of cleanout plugs that will be installed in case where raised heads may cause hazards to passing personnel or vehicles.
Countersunk
If the water level in a fire hydrant barrel rises after the hydrant is shut off, then?
The main valve is leaking
What is the normal operating pressure of a water distribution system?
40 to 75 psi
Which instrument is used to measure velocity flow from a fire hydrant?
Pitot tube
After you have taken all the hydrant readings, you should shut down the hydrants slowly to?
Prevent surges in pressure
One of the factors to consider when sizing the supply for a building is type of?
Flush devices
To solder copper joints in a water distribution piping, you must not use solder containing?
More than 0.2 percent lead
How are the building water distribution branch lines normally installed?
Horizontally, with a slight grade toward the point of use
What device do you install in a building distribution system to correct a water hammer problem?
Vertical air chamber
The first step in the rough-in of fixtures is to locate the?
Exact position of the opening for each fixture
Where on the studs should you cut holes for water supply lines?
Center
To reinforce a structural beam that has been undercut?
Place a strap iron brace across the notch and fasten it with lag screws
When hanging steel pipe, place hangers no further apart than?
10 feet (3.0 m)
How many feet apart should 1 ½ inch diameter horizontal copper tubing be supported?
6 feet (1.8 m)
Lead pipe and tubing must be supported vertically every?
4 feet (1.2 m)
The primary purpose of periodic testing of water mains of flow and pressure is to ensure that?
Sufficient water is available for fire fighting
Who must be notified anytime a water main is turned off?
Fire department
How many times are pipes in the water systems tested?
Twice, after rough-in and after fixtures are installed
How much air pressure should you use for testing piping for leaks?
30 psi
What can you use as a substitute for soapy water when leak testing pipe during freezing weather?
Pine oil
When winterizing a system, what is the first step in draining a water system?
Close the main shutoff valve
Which antifreeze solution should be your first choice when you are protecting fixture traps against freezing?
Glycol
When using a torch to thaw frozen pipes near wooden structures, you must isolate the area with a ?
Fire shield
The best way to thaw short length of frozen pipe up to 1 ½ inches in diameter is to use?
Electric thawers
What is the proper way to tighten bolts on a full circle clamp?
Working from the center out
What type of repair clamp should be used as a temporary repair?
Emergency pipe clamp
When installing a compression coupling, why do you dig out the area to give you as much flexibility with the pipes?
To allow for easy installation
In which order is a water main disinfected?
Flushing, dosing, testing, flushing
What is the proper length of time and velocity for flushing a main?
30 minutes / 2.5 fps
Which disinfection method is preferred on new water mains because of its simplicity and ease of use?
Calcium hypochlorite tablets
What is the correct chlorine dosage and contact time for disinfecting a water main?
50 ppm / 12 hrs
What type of drainage system collects waste from rain and melting snow?
Storm sewer
At what intervals are manholes usually placed in sewer mains?
400 to 600 ft
What may happen if a sewer pipe is laid with a fall greater than ¼ inch per foot?
Waste water runs away from solids, eventually causing stoppages
What is the desired fall for a 3 inch house sewer?
¼ inch / foot
The proper fall for a house sewer is established by?
Establishing a grade line then digging the trench to exactly this line
In constructing a sewer main, when should you backfill the trench?
After you inspect the sewer pipe
It is caused by foreign objects like string or thread suspended over outlet arm of the trap.
Capillarity action
For best results how should you backfill a trench?
Backfill in layers of not more than 4 in and tamp with a mechanical tamper
The building sewer is usually made of clay tile, cast iron, asbestos cement?
Plastic pipe
What is the name of a short piece of pipe with a hub at one end and a straight cut or 45 degree cut on the other end that is used to tap into a sewer main?
Thimble
Which type of sewage lift station houses the pumps and motors in a different compartment than the one that receives the wastewater?
Dry pit
What are the two classes of drainage piping?
Soil and waste
Which type of drainage piping only conveys liquids that are free of fecal matter?
Vent
In a building drainage system, what is the definition of a stack?
Vertical pipe of a system of soil, waste, or vent piping that extends through one or more stories
How does a soil stack differ from a waste stack?
A soil stack carries the human fecal discharge of water closets, urinals, or other similar fixtures to the building drain; whereas, a waste stack carries waste that is free of fecal matter from all fixtures
What is used to determine the size of the stack after the fixture unit values have been totaled?
Stack table
When you install an individual vent, how many inches must the venting piping rise above the fixture flood rim before it changes direction?
6”
What is the minimum sized pipe that you can use for a wet vent?
1 ½ inches
How do you repair a leak on a plastic pipe fitting?
Cut fitting out and install new fitting
What are the primary means of inspecting and maintaining the sewer system?
Manholes
What is used to remove ice from a manhole cover?
Nonsparking tools
What should you do if an oxygen deficient condition is present in a manhole?
Ventilate it or use self-contained breathing apparatus
What is the correct method of disposal for discarded grease, fats, and oils?
Dump into oil/water separator
Chemical drain cleaners are appropriate when the drains are?
Flowing sluggishly
When do you perform recurring maintenance on a sewer main?
Annually
What propels the nozzle of a jet rodder throughout the length of a sewer line?
Reverse jet action of the nozzle
To repair a broken sewer main where should you block off the manhole?
Outlet side
What is used to find the location of fixtures in a building?
Plumbing blueprints and floor plans
What is the smallest drain used in lavatories?
1 ¼ inches
What is the size of trap used with the popup drain tailpiece?
1 ¼ inches
What is the name of the special tool designed to reach the hex jamnut beneath a fixture?
Basin wrench
What size supply is required for a flushometer type water closet?
1 inch
Tank water closets are preferred over flushometer water closets for residences because they?
Are less expensive
What is the smallest plastic drain that can accommodate a water closet?
3 inches
When specifications are not available, install the urinal so the lip height is?
20 to 25 inches above the finished floor line
What is the minimum size plastic waste pipe that you can use on a urinal?
2 inches
The tub overflow and drain assembly is not included in the rough-in piping for a bathtub because it is attached directly to the?
Tub at the time the tub is set
The distance between the floor and the drain board in a kitchen sink should be?
36 inches
