Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
It is standard practice to install fire hydrants on mains that are at a minimum ______ or larger? |
6 inches |
|
|
A corporation stock is used for a? |
Service line |
|
|
When PVC pipe is stacked lose, it should not be stacked more than how high? |
3 feet |
|
|
Which is the most common cause for a pipe joint failure (leaking) in newly laid pipe? |
Not having the joint completely clean |
|
|
Which should be installed at a dead-end water main? |
Blow off valve |
|
|
Compression fittings used with copper or plastic tubing seal by means of a? |
Compressed beveled gasket |
|
|
The breaking of a buried pipe when it is unevenly supported is called? |
Beam breakage |
|
|
Thrust from a water surge almost always acts ______ to the inside surface that it pushes against. |
Perpendicular |
|
|
Which thrust control is easy to use, especially in locations where existing utilities or structures are numerous? |
Restraining fittings |
|
|
The backfill material for a pipe installation should contain enough ______ to allow for thorough compaction. |
Moisture |
|
|
A bypass valve would be used with a? |
Gate valve |
|
|
Where ground frost is expected, the riser pipes in a meter pit should be at least how far away from any wall of the meter box to prevent freezing? |
1 - 2 inches |
|
|
How can a distribution operator tell if a new pipe with no obvious cracks or chips is good before it is placed in the trench for installation? |
By gently tapping the length of the pipe with a hammer; the pipe should ring or hum clearly |
|
|
Which is the recommended trench width for a 42 inch diameter ductile iron pipe? |
66 inches |
|
|
The first layer of backfill if compaction is required for a newly-installed pipe should come up to? |
The centerline of the pipe |
|
|
If special bedding material is required by the design engineer due to poor local soil conditions, the material should not contain granular material greater than? |
1 inch |
|
|
How much will a flexible disk coupling compensate for in parallel misalignment? |
1/32 inch |
|
|
Which will a flexible diaphragm coupling compensate for in angular movement? |
4.0 degrees |
|
|
When a pressure-reducing and a pressure sustaining valve are used in combination, one valve can keep a constant ______ pressure even with fluctuating demand, while the other valve holds the pressure at a minimum predetermined ______. |
Downstream; pressure |
|
|
If backsiphonage occurs with a reduced pressure device and the pressure drops below 2 psi, which process will occur? |
The relief valve will remain fully open and an air-gap (atmospheric pressure) will form between the check valves, closing them both. |
