EOG 300 pg 76-77 Gas Response

Questions and Answers

What is the primary reason for not operating electrical equipment during a gas leak in an enclosure?

It may worsen the leak.

Electrical equipment is ineffective in such situations.

It can lead to a power outage.

It could create a dangerous spark. (correct)

Which factor is essential when considering evacuation measures for a gas leak incident?

The size or magnitude of the incident. (correct)

The smell of gas.

The time of day.

The number of occupants in the building.

Why is it important to vent structures with gas accumulation?

To ensure proper heating and air conditioning.

To prevent dangerous gas concentrations. (correct)

To reduce the likelihood of explosions.

To increase the pressure inside.

What is the primary characteristic of LPG compared to natural gas?

It is heavier than air. Signup and view all the answers

What is the recommended source control action for gas leaks in homes?

Shut off supply at the appliance valve. Signup and view all the answers

When should a fire department consider using Hazmat resources during a gas leak incident?

When they cannot find or control the leak. Signup and view all the answers

What is a crucial method for initiating positive pressure ventilation (PPV) for gas leaks?

From an upwind position. Signup and view all the answers

What action is NOT recommended when a gas leak is detected?

Turn off all electric switches and breakers. Signup and view all the answers

What is the first course of action for firefighters at a natural gas leak with fire?

Protect exposures and wait for ONG to control the leak. Signup and view all the answers

When considering an LPG incident, which factor is most critical for decision-making?

The potential for the cylinder to rupture (BLEVE). Signup and view all the answers

What is the recommended minimum flow rate of water to cool a single exposed cylinder?

500 gpm Signup and view all the answers

What approach should firefighters take when positioning themselves relative to horizontal tanks in LPG incidents?

Establish a staging area on the sides of the tanks. Signup and view all the answers

Why is a exterior fire from a natural gas leak often considered safer?

Firefighters standby, protect exposures and wait for ONG to control leak Signup and view all the answers

What equipment consideration is mentioned for dealing with LPG incidents?

Unmanned apparatus deck guns or ladder pipes. Signup and view all the answers

What should be avoided when responding to exposed and venting cylinders?

Shutting off the fuel directly. Signup and view all the answers

What indicates the amount of product left in an LPG cylinder during an incident?

Thermal imaging cameras and visible cold lines. Signup and view all the answers

When a leak from a line or cylinder is on the exterior of a structure what may be used to disperse vapors?

Fog streams Signup and view all the answers

Study Notes

Natural Gas & LPG Response

Gas leaks can range from minor issues like a "smell of gas" in residences to significant hazards like a high-pressure gas main rupture.
Natural gas is lighter than air and ascends rapidly, while LPG is heavier and settles in low areas.
Avoid operating light switches or electrical equipment in regions with gas leaks to prevent ignition.

Evacuation and Shelter-In-Place

Evacuation or sheltering decisions must consider the incident's size and severity.
Consult the Emergency Response Guide (ERG) for safe distance measures during large-scale incidents.

Locate and Control Source

Common causes of gas leaks in homes include malfunctioning appliances or improper installations.
Residents should be advised to have qualified professionals repair any faulty appliances.
If the leak source is undetectable or unmanageable, call ONG for support.
The Incident Commander (IC) may involve Hazmat teams for assistance.

Ventilation

Venting structures is critical to dispersing gas pockets, which can be flammable.
Use Positive Pressure Ventilation (PPV) from an upwind position to prevent ignition hazards.
Electric PPV fans and smoke ejectors are intrinsically safe and suitable for use in gas-rich environments.

Vapor Dispersion

Fog streams can effectively disperse vapors when leaks occur outside buildings, reducing flammability risks.

Fire and Explosion Response

For exterior fires caused by natural gas leaks, firefighters should protect exposures and allow ONG to handle the leak.
Leaks accompanied by fire are often safer than those without, due to the natural dissipation of gas.
Firefighters may use fog streams to advance toward the source when conditions permit.

LPG and Cylinder Gas Incidents

Incidents involving LPG and gas cylinders require heightened awareness of the potential for cylinder rupture or BLEVE.
Assess the incident's severity, fire exposure duration, and life safety risks to inform Incident Commander decisions.
Use Thermal Imaging Cameras (TICs) and check for cold lines on cylinders to estimate the remaining gas reserves.
Establish a staging area next to the sides of horizontal tanks and avoid positioning directly in front of the cylinders.
When cooling cylinders, apply at least 500 gallons per minute for single units, with a more substantial flow for multiple cylinders.
Opt for unmanned deck guns or master streams when cooling is necessary; direct firefighter access to venting cylinders is highly discouraged for safety.

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Description

This quiz covers Section 300 of the Tulsa Fire Department's Emergency Operating Guidelines, focusing on strategic and tactical considerations for responding to natural gas and LPG leaks. Participants will learn about the properties of these gases and effective response strategies to ensure safety and efficiency during emergencies.