NFPA 17a Standard for Wet Chemical
Systems Questions and Answers |
Latest Version | 2025/2026 | Correct &
Verified
What is the primary purpose of a wet chemical fire suppression system?
✔✔To suppress fires involving cooking oils and fats in commercial kitchens.
Which class of fire is a wet chemical system designed to extinguish?
✔✔Class K fires.
What type of agent is used in wet chemical systems?
✔✔A potassium-based liquid solution.
Why is wet chemical preferred over water for kitchen fires?
✔✔Because it saponifies the oil and prevents re-ignition.
What does saponification mean in fire suppression?
✔✔The chemical reaction that turns fat into a soapy substance to smother fire.
1
,Where are wet chemical systems typically installed?
✔✔Above commercial cooking appliances such as fryers and ranges.
Which standard provides the requirements for design, installation, and maintenance of wet
chemical systems?
✔✔NFPA 17A.
What is the minimum coverage area for a single wet chemical nozzle over a fryer?
✔✔It must cover the entire cooking surface plus a margin around the appliance.
How often should wet chemical systems be inspected?
✔✔Monthly for visual inspection and annually for a full maintenance check.
What is the purpose of a fusible link in a wet chemical system?
✔✔To automatically activate the system when a high temperature is detected.
At what temperature does a fusible link typically activate?
2
, ✔✔Around 360°F to 375°F, depending on appliance and system design.
Why is a manual pull station installed in wet chemical systems?
✔✔To allow staff to manually activate the system in an emergency.
What should be done immediately after a wet chemical discharge?
✔✔Evacuate the area, call the fire department, and allow the agent to cool and settle.
Why is water not recommended to use after a wet chemical discharge?
✔✔Because it can cause splattering of hot grease and re-ignite the fire.
Which appliances require coverage by wet chemical systems?
✔✔Deep fryers, griddles, woks, and commercial ranges.
What is the purpose of the piping in a wet chemical system?
✔✔To deliver the agent from the storage cylinder to the nozzles above the appliance.
Why must the system nozzle pattern be carefully designed?
3
Systems Questions and Answers |
Latest Version | 2025/2026 | Correct &
Verified
What is the primary purpose of a wet chemical fire suppression system?
✔✔To suppress fires involving cooking oils and fats in commercial kitchens.
Which class of fire is a wet chemical system designed to extinguish?
✔✔Class K fires.
What type of agent is used in wet chemical systems?
✔✔A potassium-based liquid solution.
Why is wet chemical preferred over water for kitchen fires?
✔✔Because it saponifies the oil and prevents re-ignition.
What does saponification mean in fire suppression?
✔✔The chemical reaction that turns fat into a soapy substance to smother fire.
1
,Where are wet chemical systems typically installed?
✔✔Above commercial cooking appliances such as fryers and ranges.
Which standard provides the requirements for design, installation, and maintenance of wet
chemical systems?
✔✔NFPA 17A.
What is the minimum coverage area for a single wet chemical nozzle over a fryer?
✔✔It must cover the entire cooking surface plus a margin around the appliance.
How often should wet chemical systems be inspected?
✔✔Monthly for visual inspection and annually for a full maintenance check.
What is the purpose of a fusible link in a wet chemical system?
✔✔To automatically activate the system when a high temperature is detected.
At what temperature does a fusible link typically activate?
2
, ✔✔Around 360°F to 375°F, depending on appliance and system design.
Why is a manual pull station installed in wet chemical systems?
✔✔To allow staff to manually activate the system in an emergency.
What should be done immediately after a wet chemical discharge?
✔✔Evacuate the area, call the fire department, and allow the agent to cool and settle.
Why is water not recommended to use after a wet chemical discharge?
✔✔Because it can cause splattering of hot grease and re-ignite the fire.
Which appliances require coverage by wet chemical systems?
✔✔Deep fryers, griddles, woks, and commercial ranges.
What is the purpose of the piping in a wet chemical system?
✔✔To deliver the agent from the storage cylinder to the nozzles above the appliance.
Why must the system nozzle pattern be carefully designed?
3
