Midterm Practice Flashcards
What is the max working temperature of the following plastic pipes:
1) CPVC
2) PP (polypropylene)
3) ABS
4) PVC
5) PE (polyethylene)
1) CPVC 212°F (100°C)
2) PP 180°F (82°C) - proxylene
3) ABS 180°F (82°C)
4) PVC 140°F (60°C)
5) PE 130°F (55°C) -pex
How is fibreglass pipe joined?
Butt and strap or e.r.w.
Before butt welding plastic pipe and fittings you must ensure?
That pipe ends are square
What should you put in a plastic pipe before you thread it?
A wooden plug
What is the max working temp of ABS pipe
180°F (82°C)
What color is the cement for ABS DWV pipe and fittings?
Yellow
Gate valves are designed to operate either fully open or fully closed?
A) True
B) False
A) True
Is a ball valve suitable for throttling fluids?
No
Valve handles are typically installed in what position?
The open position
Does bent copper tube have a higher bursting pressure than that of regular copper tube?
Yes
You should ensure that the valve is _____ before making any repairs to the valve.
Isolated
Are gate valves designed to operate either fully open or fully closed?
Yes
Is type K copper tube designed for bending
No…type K has the thickest wall of the five types of copper tube
What is the most common degree flare fitting?
45°
What are high pressure compression fittings rated for?
10,000 PSI
Bell type joints are primarily used for?
Below ground sanitary and storm drainage
Thrust blocks are used for?
Controlling forces caused by the movement of fluids and pipe
Before inserting the male end of the bell pipe into the socket you should?
Apply lubricant
What does chamfering mean?
To bevel male end before inserting into female fitting
Adding magnesium to cast iron will?
Increase its strength
The carbon content of cast-iron makes it?
Very brittle
What is the most widely used type of cast-iron?
Black cast-iron
How are cast-iron pipes that have a hub and spigot ends joined?
Compression, lead and oakum, and cold caulking
Are cast iron water service pipe designed for pressurized raw or potable water systems?
No
