MAG SPRINKS Flashcards
MAGAZINE SPRINKLER KNOWLEDGE
1
Q
- What is the importance of magazine sprinklers?
A
- Sprinkler systems are used for emergency cooling and fire fighting in magazines, ready-service rooms, ammunition - and missile-handling areas.
2
Q
- How many types of magazine sprinklers are there? What are they?
A
- 2; Dry and Wet Type.
3
Q
- Once a magazine sprinkler system is activated, what is the only way to secure the system?
A
- Although the remote control valve permits securing from any control station when the system was actuated automatically, the PRP valve must be manually reset prior to the manual control valve being returned to the NEUTRAL position. Otherwise sea water pressure from the PRPV will re-open the magazine sprinkler control valve. Likewise, when a system is actuated and secure from separate manual control stations, the actuating manual control valve must be returned to the NEUTRAL position first to prevent a re-opening of the sprinkler control valve.
4
Q
- A modern sprinkler system can wet down all bulkheads at a rate of how many gallons per min per square foot?
A
- A modern sprinkler system can wet down all exposed bulkheads at the rate of 2 gallons per minute per square foot.
5
Q
- A modern sprinkler system can wet down the deck area at a rate of how many gallons per min per square foot?
A
- Sprinkle the deck area at the rate of 4 gallons per minute per square foot.
6
Q
- What is a CLA-Valve?
A
- The diaphragm operated magazine sprinkler control valve is a normally closed, globe valve that is designed to open fully upon actuation, admitting seawater to the sprinkler system. This valve is also designed to fail in the closed position.
7
Q
- What is a HSD?
A
- HSD = Heat-Sensing Device
8
Q
- What is the Magazine Sprinkler Bible?
A
- S9522-AA-HBK-010 (Series).
9
Q
- What are Bridge Wall Markings?
A
- That figure cast into the side of a valve that, in conjunction with a direction-of-flow arrow also cast on the valve, allows one to determine whether flow through the valve is over or under the seat.
10
Q
- What are the different loops within the system?
A
- Neutral, Open and Closed Loop.
11
Q
- What is the biggest CLA-Valve size in use?
A
- Eight Inch.
12
Q
- What is the exact size of an orifice plate opening?
A
- 0.098.
13
Q
- What is the minimum operating pressure needed for magazine sprinkler operations?
A
- 40 PSI.
14
Q
- How many different spray patterns are there associated with Magazine Sprinkler Heads?
A
- Three; 90, 160, or 180 degrees.
15
Q
- What is the minimum overhead clearance of each spray pattern?
A
- Sprinkler heads installed above overhead .tracks shall be located between tracks and shall not be located within 4 inches vertically of the tracks to allow adequate water distribution above the tracks.
