Inergen (IG-541) is being used for protection of several rooms which contain highly valuable historic documents. If the fire type is considered Class A and the design concentration of Inergen is provided, determine the clean agent-air mixture density.
a. 1.15 kg/cu. m
b. 1.25 kg/cu. m
c. 1.28 kg/cu. m
d. 1.44 kg/cu. m

Solution | Posted 06/14/18

Halocarbon clean agents are effective fire extinguishing products due to what principal(s):
i. oxygen dilution
ii. heat extraction
iii. chemical combustion interruption

a. ii only
b. i and ii only
c. ii and iii only
​d. i, ii, and iii

Solution | Posted 10/16/17

What is the foam friction loss (in feet of head per 100 ft of pipe) for a 4:1 expansion foam flowing 130 gpm in a 2-1/2" schedule 40 pipe most nearly?
a. 0.3 ft/100 ft
b. 0.8 ft/100 ft
c. 3.0 ft/100 ft
​d. 8.0 ft/100 ft

Solution | Posted 09/21/17

What is the difference between malleable and cast iron? Is there a preference between the two for use in sprinkler or clean agent system fittings?

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We have about 5 kitchen hoods in a restaurant, all connected to Ansul systems, then tying into a Halton pollution control unit. Halton is stating we need a fire protection system inside the ductwork within 15’ from it's unit. Who typically designs this system and would it be another Ansul system? The fire protection engineer of record only does water...

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