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Staying safe while saving others: Natural gas safety for first responders

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Firefighters, police, and EMTs are typically first on the scene in an emergency and face the greatest risk from natural gas leaks and fires.

Understanding the potential dangers and dealing with them correctly makes everyone safer.

This program is designed to supplement, not replace, your department’s standard operating procedures (SOPs).

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Natural Gas Safety Basics

n Properties of Natural Gas

n The Natural Gas Delivery System

n Pipeline Locations

n Pipeline Reliability

n Hazard Prevention and Preparedness

n Preventing Natural Gas Ignition

n Responding to Natural Gas Emergencies

n Indoor Natural Gas Leaks

n Outdoor Natural Gas Leaks

n Natural Gas Fires

n Sources of Additional Information

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Properties of Natural Gas

n Natural gas is lighter than air. – It will follow the path of least

resistance and will rise.– When underground or in

enclosed spaces, gas willmove laterally or migrate.

n Chemical additives produce the familiar sulfur-like smell of natural gas.

n A lit cigarette is enough to ignite natural gas.

n Natural gas has an explosive (flammable) concentration range between about 5% and 15% gas to air.– At concentrations below

5% or above 15%, natural gas will not burn.

n Burning natural gas will not explode.

n Liquefied gases have different properties than natural gas.

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The Natural Gas Delivery System

n There are three types of lines in the natural gas network—transmission, main, and service lines.

n Natural gas in transmission pipelines may not yet be odorized, especially in low-density areas.

LINE TYPE Transmission Pipelines Main Lines(Distribution Lines) Service Lines

SIZE (diameter) up to 4 feet 2 to 20 inches ¼ inch to 1 inch

PRESSURE 400 to 1000 psi less than 100 psi same as main lines

OPERATED BY interstate or intrastate pipeline companies or local utilities

local natural gas utilities

local natural gas utilities

LOCATION INFORMATIONNote: Landscaping and/or erosion can change depth of lines.

“right-of-way” corridors; marked with transmission line markers

about 2 feet below ground

up to 2 feet below ground

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The Natural Gas Delivery System

n Between service lines and individual structures are service meters.– Different structures use different types

of meters. n The size of a pipe is NOT a reliable indicator of

the gas pressure.

LINE TYPE Transmission Pipelines Main Lines(Distribution Lines) Service Lines

SIZE (diameter) up to 4 feet 2 to 20 inches ¼ inch to 1 inch

PRESSURE 400 to 1000 psi less than 100 psi same as main lines

OPERATED BY interstate or intrastate pipeline companies or local utilities

local natural gas utilities

local natural gas utilities

LOCATION INFORMATIONNote: Landscaping and/or erosion can change depth of lines.

“right-of-way” corridors; marked with transmission line markers

about 2 feet below ground

up to 2 feet below ground

Single-unit residential meter

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Pipeline Locations

n High-visibility markers show the general route of our high-pressure natural gas transmission pipelines and some distribution pipelines.

n For security purposes, these markers do not show the exact location, path, depth or number of gas pipelines in the area. In addition, pipelines may not follow a straight course between markers.

n These markers are usually found at road crossings, fence lines and street intersections.

n The approximate location of natural gas transmission pipelines are available on the National Pipeline Mapping System (NPMS) website: npms.phmsa.dot.gov.– For the specific location of transmission pipelines that cross your response

area, state and local officials may apply for access to the Pipeline Information Management Mapping Application (PIMMA) via the Office of Pipeline Safety: ww.npms.phmsa.dot.gov/about/contact.

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Pipeline Reliability

n Pipelines are a key part of our nation’s energy infrastructure and a highly efficient, safe and reliable means of transporting natural gas.

n Their design, construction, operation and maintenance are extensively regulated by federal and state agencies.

n To ensure gas is delivered safely and reliably, CPS Energy continually tests, inspects and repairs their natural gas pipelines and monitors them 24/7 for potential leaks.

n Keeping pipelines secure and safe from accidental or intentional damage is everyone’s responsibility.

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Hazard Prevention and Preparedness

n Natural gas pipeline leaks can be caused by corrosion and material defects; however, the vast majority of leaks occur due to accidental damage from excavation, construction or farming activities.

n To prevent pipeline damage, CPS Energy educates excavators and the public about digging safely near gas pipelines, and they participate in the Texas811, or “Call Before You Dig” program.

n The CPS Energy Integrity Management Program identifies, assesses and manages risks to natural gas pipelines. For an overview of this program, please visit cpsenergy.com.

n Federal regulations require all natural gas utilities to have an emergency response plan for natural gas pipeline incidents. To access the CPS emergency response plan for your jurisdiction, please contact Public Safety & Education at (210) 353-3939.

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Preventing Natural Gas Ignition

n Even the smallest flame or spark can cause a natural gas explosion. Avoid turning electrical equipment or devices on or off in the vicinity of a leak:– Use intrinsically safe radios and

flashlights.– Avoid using doorbells, light switches,

garage door openers, electrical devices, matches, and lighters, and prevent their use by others.

– Take steps to eliminate sources of static electricity.

– If you must use a flashlight, turn it on before approaching the area.

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Responding to Natural Gas Emergencies

n When called for a gas leak or fire or if you smell gas at an incident scene, assume there’s danger.

n Contact CPS Energy, and wait for them to arrive.

n Provide the best possible directions to the location.

n Evacuate the area.n Park emergency vehicles

away and upwind from the area.– Do not park over manholes

and storm drains.

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Responding to Natural Gas Emergencies

n NEVER attempt to shut off natural gas valves or relief vents.

n Turn off gas at meters or appliance supply line valves only. – A ¼ turn to the right will turn off a meter.– Use the same procedure at an appliance

supply line.– Tie and label the meter or appliance supply

line to let others know it has been shut off. n NEVER attempt to turn gas service back on.

Inform CPS Energy of any gas service valve that has been closed, and do not reopen it under any circumstances.

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Indoor Natural Gas Leaks

n Indoor gas leaks can result from malfunctioning gas-fed appliances.

n DO NOT open windows until you are certain the gas supply has been shut off. – Ventilate structures from top to bottom.– Never ventilate structures while personnel are inside.

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Carbon Monoxide

n Understanding carbon monoxide (CO) leaks:– CO has no color, odor, or taste.– CO leaks are frequently caused when

fuel-burning appliances malfunction or are used without adequate ventilation.

n CO poisoning can look like a common illness, but is deadly if untreated. Know the signs:– Flu-like symptoms– Loss of consciousness– Lips and skin turn blue

n Get victims outdoors immediately and seek medical attention.

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Outdoor Natural Gas Leaks

n Outdoor natural gas leaks can be caused by construction-related damage, cracks due to extreme weather, or pipe corrosion.

n Contact CPS Energy immediately to shut off the gas.

n Evacuate the area. n Be alert for migrating gas.

Gas can accumulate in storm drains, construction trenches, buildings, and other utility lines.

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Outdoor Natural Gas Leaks

n In addition to the familiar sulfur-like smell, other indicators of an outdoor leak include:– A hissing, whistling or roaring

sound– Dirt blowing or spraying into the

air– Continuous bubbling in water– An exposed pipeline after an

earthquake, fire, flood or other disaster

– Grass/plants dead or dying for no apparent reason

Dead or dying vegetation

Dirt blowing into the air

Continuous bubbling Exposed pipeline

Leaking natural gas may kill grass or plants, throw dirt up into the air or make bubbles in water. Frozen ground in warm weather may also indicate a gas leak. Gas pipelines exposed by earthquakes, fires or floods may be a source of leaks.

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Natural Gas Fires

n When responding to a fire involving natural gas, your best and safest course of action is to let it burn.

n Call CPS Energy immediately.n Evacuate the area and protect

exposures.n Do not park emergency vehicles under

overhead utility lines.

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Natural Gas Fires

n For structure fires, shut off the gas supply only if you can safely access the meter.

n Once the gas supply is off, remain alert for gas migration and possible re-ignition.

n DO NOT use water to suppress a natural gas fire. Utility personnel and the incident commander will tell you how to proceed.– Use a fog spray to cool and

protect combustible exposures.

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Natural Gas Safety Review

n Prevent ignition of natural gas.n When natural gas is involved in an emergency, contact CPS Energy.n Park emergency vehicles away and upwind from the area of a

natural gas emergency.n Evacuate the area and be alert for migrating or accumulating gas.n Do not ventilate natural gas until the supply is off and all personnel

are out of the structure.n Turn off natural gas service at meters or appliance supply lines only. n When natural gas is burning, let it burn and protect area exposures.

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Sources of Additional Information

n In case of emergency, call CPS Energy at 210-353-HELP (4357).

n For additional information on gas pipeline safety, please visit these websites:– cpsenergy.e-smartonline.net/firstresponder

– cpsenergy.com/safety

– rrc.state.tx.us

– phmsa.dot.gov

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Thank you.