Wet, Dry & Anti-Freeze Systems Flashcards
(50 cards)
Wet system pressure gauge connection to be no smaller then
1/4”
Which gauge cannot be calibrated
Standard gauge
Relief valves are to be a minimum of what size and what pressure
1/2” in size, 175psi or 10 psi over system pressure, whichever is greater
Air venting is required on
All systems using metallic piping
Air vent manual valve to be a minimum of ___ in size
1/2”
What is the purpose of air venting a wet system
Get rid of as much trapped air as possible, minimize corrosion, microbial activity
Wet system low point drain less then 5 gallons
1/2 plug or cap
Full draining via removal of single pendant
Easily separated flex coupling
Wet system, low point on system more then 5, less then 50 gal
3/4 valve
Wet system, low point on system larger then 50 gals
1” valve
How often should drain connections be tested
Annually or as needed
Main drain tests, what is the percentage of reduction in flow pressure that shall be corrected
10%
How often are alarm devices to be tested
Quarterly
Hydraulic nameplate is required to have
All hydraulically calculated wet systems / inspect monthly
Anti freeze information sign shall indicate
Location of anti freeze system
Location of Auxiliary&low points
Dry system air shall be able to be restored in ______ minutes (above -15C)
30 minutes
Dry system air shall be able to be restored in ______ minutes (below -15C)
60 minutes
Air supply connections shall be a minimum of what size
1/2”
Air supply must enter the valve
Above priming level
What’s the purpose of an air maintenance device
To control pressure and air flow
Where is an air maintenance device not required
When a compressor has a capacity of less then 5.5ft3 at 10psi
How many dry pipe valves per air maintenance devices
One
What is required when using a stored supply to refill a dry system
A low pressure alarm
When nitrogen is coming from a stored supply what must be used
A pressure regulator
Dwelling units ITV delivery time
15 seconds
