FDNY G41 Use of Liquefied Petroleum Gas or
Compressed Natural Gas for Torch-Applied
Roof Systems Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the minimum safe distance between a torch flame and
combustible materials during torch-applied roofing operations?
10 feet
Maintaining a safe distance prevents accidental ignition of
combustible materials.
2. Before using a LPG or CNG torch, the operator must inspect:
Hoses, regulators, and connections
Defective equipment can cause leaks and fires, so a thorough
inspection is essential.
3. What type of fire extinguisher must be immediately available at
the work site?
Class B fire extinguisher
Class B extinguishers are suitable for flammable gas and liquid
fires.
4. Which of the following is a key requirement for torch storage on-
site?
Upright and secured in a well-ventilated area
Proper storage prevents tipping and accumulation of flammable
gas.
,5. What is the first step if a gas leak is detected during roofing
operations?
Shut off the gas supply immediately
Stopping the gas flow minimizes the risk of ignition.
6. Who is responsible for ensuring safety procedures are followed
during torch operations?
The torch operator
Operators must adhere to FDNY and company safety standards.
7. What personal protective equipment (PPE) is required for torch-
applied roofing?
Flame-resistant clothing, gloves, and eye protection
Proper PPE protects against burns, sparks, and UV exposure.
8. Which regulator feature is critical for safe LPG or CNG use?
Pressure relief valve
Prevents over-pressurization that could lead to hose or tank
rupture.
9. How often should torch equipment be inspected for leaks?
Before each use
Regular inspection ensures safe operation and prevents accidents.
10. Which of the following is prohibited near torch operations?
Open containers of flammable liquids
Proximity to open flammable materials significantly increases fire
risk.
11. What is the correct method for lighting a torch?
Use a spark igniter, not matches or lighters
Controlled ignition reduces accidental flash fires.
, 12. When transporting LPG cylinders on a roof, they must be:
Upright and secured
Prevents tipping and potential leaks.
13. What is the maximum allowable pressure for LPG torch
systems?
10 PSI
Exceeding safe pressure limits can cause hose or regulator failure.
14. How far must cylinders be stored from roof edges?
At least 10 feet
Prevents accidental falls and exposure to high heat.
15. During hot weather, cylinders should be:
Kept in shaded, ventilated areas
Heat increases internal pressure and risk of rupture.
16. What should be done with cylinders after use?
Close valves and remove from the roof
Prevents unattended gas leaks.
17. Which type of hose is approved for LPG torch use?
High-pressure, rubber-reinforced hose rated for gas service
Hoses must withstand operational pressures and temperature.
18. How should regulators be installed on LPG cylinders?
Tightened securely with proper thread engagement
Loose regulators can leak gas and create hazards.
19. What is the safest approach if a torch flame goes out
unexpectedly?
Shut off the gas and relight carefully
Prevents unintentional gas accumulation and flash fires.
Compressed Natural Gas for Torch-Applied
Roof Systems Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the minimum safe distance between a torch flame and
combustible materials during torch-applied roofing operations?
10 feet
Maintaining a safe distance prevents accidental ignition of
combustible materials.
2. Before using a LPG or CNG torch, the operator must inspect:
Hoses, regulators, and connections
Defective equipment can cause leaks and fires, so a thorough
inspection is essential.
3. What type of fire extinguisher must be immediately available at
the work site?
Class B fire extinguisher
Class B extinguishers are suitable for flammable gas and liquid
fires.
4. Which of the following is a key requirement for torch storage on-
site?
Upright and secured in a well-ventilated area
Proper storage prevents tipping and accumulation of flammable
gas.
,5. What is the first step if a gas leak is detected during roofing
operations?
Shut off the gas supply immediately
Stopping the gas flow minimizes the risk of ignition.
6. Who is responsible for ensuring safety procedures are followed
during torch operations?
The torch operator
Operators must adhere to FDNY and company safety standards.
7. What personal protective equipment (PPE) is required for torch-
applied roofing?
Flame-resistant clothing, gloves, and eye protection
Proper PPE protects against burns, sparks, and UV exposure.
8. Which regulator feature is critical for safe LPG or CNG use?
Pressure relief valve
Prevents over-pressurization that could lead to hose or tank
rupture.
9. How often should torch equipment be inspected for leaks?
Before each use
Regular inspection ensures safe operation and prevents accidents.
10. Which of the following is prohibited near torch operations?
Open containers of flammable liquids
Proximity to open flammable materials significantly increases fire
risk.
11. What is the correct method for lighting a torch?
Use a spark igniter, not matches or lighters
Controlled ignition reduces accidental flash fires.
, 12. When transporting LPG cylinders on a roof, they must be:
Upright and secured
Prevents tipping and potential leaks.
13. What is the maximum allowable pressure for LPG torch
systems?
10 PSI
Exceeding safe pressure limits can cause hose or regulator failure.
14. How far must cylinders be stored from roof edges?
At least 10 feet
Prevents accidental falls and exposure to high heat.
15. During hot weather, cylinders should be:
Kept in shaded, ventilated areas
Heat increases internal pressure and risk of rupture.
16. What should be done with cylinders after use?
Close valves and remove from the roof
Prevents unattended gas leaks.
17. Which type of hose is approved for LPG torch use?
High-pressure, rubber-reinforced hose rated for gas service
Hoses must withstand operational pressures and temperature.
18. How should regulators be installed on LPG cylinders?
Tightened securely with proper thread engagement
Loose regulators can leak gas and create hazards.
19. What is the safest approach if a torch flame goes out
unexpectedly?
Shut off the gas and relight carefully
Prevents unintentional gas accumulation and flash fires.
