Natural Gas
CH₄+Natural gas is a fossil fuel mixture consisting primarily of methane (70-90%) along with varying amounts of ethane, propane, butane, and trace gases including hydrogen sulfide and carbon dioxide. Natural gas is widely used for heating, electricity generation, cooking, and as an industrial feedstock. The composition varies by source—pipeline-quality gas is processed to meet specifications while raw natural gas may contain higher levels of impurities. Mercaptan odorant is added to detectable levels for safety per federal regulations. The lower explosive limit (LEL) is approximately 5% by volume. Leak detection is critical throughout the natural gas infrastructure from production to end-use, protecting against explosion hazards and methane emissions.
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Key Information
Essential safety and exposure information for Natural Gas
Health Effects
Asphyxiation risk in enclosed spaces. Highly flammable and explosive when mixed with air.
Common Sources
- Heating systems
- power generation
- cooking appliances
- and industrial processes.
Exposure Limits
- Simple asphyxiant
- Simple asphyxiant
- NIOSH REL
- None established
- ACGIH TLV
- Simple Asphyxiant
Regulatory Status
- OSHA
- Simple asphyxiant
- NIOSH REL
- None (asphyxiant)
- LEL
- ~5% by volume
- UEL
- ~15% by volume
- DOT
- Class 2.1 Flammable Gas, UN1971
- PHMSA
- Pipeline safety regulations
Detection Requirements
- Sensor Technology
- Catalytic Bead, Infrared (NDIR), or Semiconductor
- Detection Range
- 0-100% LEL for safety, 0-100% volume for process
- Response Time
- <15 seconds (T50) for combustible detection
- Calibration Frequency
- Quarterly to semi-annual
- LEL
- ~5% by volume (varies with composition)
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