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Leave the area immediately on foot, move away from the repair site and try to stay upwind. Once you are well away, call 911 and describe the location and what you noticed. Do not approach the crew, investigate the source, or try to operate equipment or valves.
What to do as a bystander
- Leave immediately on foot. Move away from the suspected release; do not walk toward the repair crew or try to confirm where the smell is coming from.
- Try to stay upwind. Warn others not to enter only if you can do so without moving toward the area or delaying your own exit.
- Avoid ignition sources. Do not light a flame, start a vehicle or engine, operate electrical equipment or switches, or use your phone while you are still near the suspected leak. Do not drive into a vapor cloud.
- Call 911 from a safe location. Give the location and briefly describe what you smell, hear, or see. If you know the pipeline operator, contact it after alerting emergency services.
- Stay away until responders say it is safe. Do not return to investigate or operate pipeline valves; leave assessment and isolation to trained personnel and public-safety officials.
PHMSA’s guidance is to leave the area by foot, try to stay upwind, and call 911 from safety. Its pipeline leak recognition and response guidance also warns against actions that could create ignition sources or expose you to the release.
If you are part of the repair or excavation crew
Follow the site-specific emergency action plan and the supervisor’s or incident commander’s instructions. Alert and evacuate workers to the designated safe assembly location; do not stay behind to inspect or repair a suspected release. From safety, contact 911 and the pipeline utility or operator.
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OSHA’s construction safety guidance on underground utility lines calls for worker training, alerts, evacuation, and a predesignated safe assembly location. PHMSA’s excavation damage guidance says that if digging causes a pipeline break, workers should abandon equipment, leave the area, and notify public-safety officials and the pipeline company. The site emergency plan and responders’ instructions take precedence over general public guidance.
#1 Best Overall
- Easy Installation - simply plug-in to a standard, 120V outlet in your home
- 9-volt battery backup provides protection during a power outage
- Digital LED display shows the level of carbon monoxide the CO alarm is sensing or states "GAS" when explosive gas is present
- 85-decibel alarm announces when carbon monoxide or explosive gas is detected
- Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested
Possible warning signs—and why smell is not an all-clear test
Possible signs of a pipeline release include an unusual petroleum or gaseous odor, hissing or roaring, liquid pooling, bubbling, vapor or mist, blowing dirt, fire, or abnormal or dead vegetation. Do not approach to check for these signs or use consumer equipment to test the area; leave and report the concern.
Odorized distribution gas often has a mercaptan-like smell, but transmission and gathering gas may be odorless or have a hydrocarbon smell instead. OSHA also notes that some people cannot smell the odorant and gas may not be odorized at large industrial sites. The absence of a strong odor therefore does not establish that a repair site is safe.
Rank #2
- Combustible Gas Leak Detector: The TopTes PT199 detects natural gas, methane, propane, butane, LPG, and more, pinpointing leaks to reduce the risk of explosion, keeping your family and property safe
- Visual and Audio Gas Alarm: Visual and audio alarms trigger within 0.5 seconds of gas detection. The alarm intensifies with gas concentration, and the LCD screen turns red when gas levels are high
- Batteries Included and Easy to Use: The TopTes PT199 includes 2x AAA batteries and is ready after a 30-second warm-up. The low battery indicator activates below 2.4V, and it auto-powers off after 5 minutes without operation or gas detection
- Compact Design: Pocket-sized, non-slip, and easy to carry or store in the included bag. Ideal for RV owners, DIYers, and homeowners with gas appliances. Saves you from paying hundreds of dollars in diagnostics or wasting gas in an undetected leak
- What You Get: 1x PT199 Gas Leak Detector, 1x Storage Bag, 2x AAA Batteries, 1x User Manual. Detection range: 50-1,000 ppm (based on methane). Detection distance: 1-5cm
PHMSA says: “If you witness or are involved in a pipeline emergency or you smell gas, move to a safe location and call 911.” See its Incident Reporting page. This guidance is framed for the United States, where these sources direct people to call 911; local procedures and operator contacts may vary.
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Rank #4
- WIDE DETECTION RANGE: Detect gas concentrations from approximately 50 to 10,000 ppm* (*based on Methane) for versatile gas monitoring
- ADJUSTABLE SENSITIVITY: Choose between High (50 to 1000 ppm) and Low (1000 to 10,000 ppm) sensitivity levels for accurate gas detection
- ENHANCED VISUAL AND AUDIBLE ALERTS: Stay alerted with five red LED's (visual) and 85dB audible alerts that intensify as gas concentration increases
- EASY CALIBRATION: Automatic zero-point calibration at power-up ensures accuracy; flashing lights during self-calibration, no gas presence indicated
- FLEXIBLE GOOSENECK DESIGN: Expand the sensor's reach with the 18-inch flexible gooseneck that conveniently clips onto the meter for storage
Rank #3
- Combustible Gas Leak Detector: PT177 is a useful little tool that helps every household with gas appliances to quickly and easily pinpoint the leakage of combustible gas including LPG, methane, ethane, propane, butane, natural gas, coal gas, etc. Important Warm-Up Notice: Before use, the PT177 must be powered on and warmed up for 30 seconds in a clean, gas-free environment to ensure accurate detection results
- Visual and Audible Alarms: PT177 gas detector requires a 30-second auto-calibration after powering on and can detect gas and trigger an alarm within 0.5 to 3 seconds. Five red LEDs and a 75 dB audible alarm intensify as gas concentration increases
- Pocket sized with a pocket clip that allows you to carry it in your shirt pocket. The included storage bag makes the natural gas detector easy to store. It is a convenient tool for RV enthusiasts, DIYers, homeowners with gas appliances, etc
- User Friendly Features: When the battery voltage is below 2.4 volts, the power indicator light will flash to remind you to replace the battery in time. If inactive for 5 minutes without operation or detecting gas, the PT177 will automatically turn off
- What You Get: PT177 Gas Leak Detector, a drawstring storage bag, two AAA batteries, and a user manual
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