Oil and gas extraction combines heavy machinery, high-pressure lines, toxic and flammable gases, and long drives between remote sites. NIOSH research has found that motor vehicle crashes are the industry's leading cause of work deaths, and OSHA names struck-by and caught-between incidents as the leading cause of deaths at the well site. Gas exposure adds its own toll: hydrogen sulfide, hydrocarbon vapor at tank hatches, and silica dust at fracturing sites. This guide sets out which OSHA rules apply to drilling, servicing and production, the exemptions that surprise many operators, and how to choose and use the equipment for each hazard.
Which rules apply
Oil and gas work sits in an unusual place in OSHA's rules. OSHA has stated that only site preparation for drilling falls under its construction standards; everything else in drilling and servicing falls under general industry rules. Several of those general industry rules then carve out exceptions.
| OSHA rule | How it applies to oil and gas |
|---|---|
| Fall protection (1910.28) | Applies to rigs. There is no oil and gas or derrick exception; protection is required from 4 feet |
| Hearing conservation (1910.95) | Drilling and servicing are exempt from the hearing conservation program, but the 90 dBA exposure limit still applies. Production, compression and gas plants are not exempt |
| Lockout/tagout (1910.147) | Oil and gas well drilling and servicing are excluded. Production, midstream and refining are not named in the exclusion |
| Benzene (1910.1028) | Drilling, production and servicing are exempt and fall under older Table Z-2 limits instead. Refineries, and gas plants processing gas with 0.1% benzene or more, are covered |
| Respirable silica (1910.1053) | Covers hydraulic fracturing |
| PPE (1910.132) | The basis for OSHA's flame-resistant clothing policy |
Equipment at a glance
| Site or task | Main hazards | Equipment to plan for |
|---|---|---|
| Drilling rig | Falls from the derrick, dropped objects, struck-by, flash fire near hydrocarbon zones | Full-body harness and climb assist, tool tethers, hard hats, flame-resistant clothing, gas monitors |
| Well servicing and completions | Pressurized lines, flash fire, chemicals | Flame-resistant clothing, face shields and goggles, chemical gloves, gas monitors |
| Hydraulic fracturing | Silica dust, high-pressure lines, noise | Respirators under a written program, hearing protection, eye protection |
| Production and tank batteries | Hydrocarbon vapor and low oxygen at hatches, H2S, benzene | Multi-gas monitors, supplied air for gauging where needed, flame-resistant clothing, impermeable gloves |
| Compressor stations and gas plants | Noise, H2S, stored energy | Hearing protection, H2S monitors, lockout/tagout devices |
| Driving between sites | Crashes | Vehicle safety equipment, seat belt policy |
Hydrogen sulfide
H2S is toxic, flammable between 4% and 46% in air, and deceptive. NIOSH warns that the sense of smell fatigues rapidly and cannot be relied on to warn of continuing exposure.
| H2S level | Source | Meaning |
|---|---|---|
| 2 to 5 ppm | OSHA | Prolonged exposure can cause nausea, tearing eyes, headaches and loss of sleep |
| 10 ppm | NIOSH; OSHA, describing industry practice | NIOSH's recommended 10-minute ceiling; the common alarm set point to warn workers and evacuate |
| 20 ppm | OSHA Table Z-2 | Ceiling limit |
| 50 ppm | OSHA Table Z-2 | Maximum peak, allowed once for up to 10 minutes if no other exposure occurs |
| 100 ppm | NIOSH | Immediately dangerous to life or health |
| 700 ppm and above | OSHA | Collapse within one or two breaths; death possible |
How to protect workers. OSHA's oil and gas guidance calls for both personal and area monitoring, with personal monitors worn as close as possible to the breathing zone and kept calibrated. Training and site planning should cover wind direction, with windsocks visible, routes of escape, and the location of safe briefing areas. Where H2S levels have not been measured, OSHA guidance calls for supplied-air respirators such as self-contained breathing apparatus, and an OSHA letter states that an unmeasured hatch on crude with significant or unknown H2S must be treated as immediately dangerous, requiring SCBA or air-line respirators with an escape provision. For escape, NIOSH lists a full-face gas mask or an escape-type SCBA.
OSHA's Fatal Facts on one H2S death shows why each layer matters. A worker answering a pump alarm died because the fixed H2S monitors in the building were not working and he wore no personal monitor; a family member who went in after him also died. OSHA's lesson: require personal H2S detectors for every employee and visitor, and keep fixed systems maintained. OSHA also points operators to API RP 49 for H2S contingency plans and ANSI/ASSE Z390.1 for H2S training programs.
Browse gas detection and respiratory protection, including the MSA Altair 5X four-gas detector and calibration gas.
Tank gauging and thief hatches
A 2016 NIOSH and OSHA hazard alert documented nine deaths between 2010 and 2014 of workers who opened hatches on crude oil production tanks to gauge or sample. The causes were hydrocarbon gas and vapor exposure and oxygen deficiency; in one case oxygen measured as low as 6.9%. H2S was ruled out in all nine. NIOSH also measured benzene peaks above 200 ppm at open hatches.
The alert's recommendations, in brief:
- Gauge and sample remotely or automatically so no one opens the hatch; install sampling taps and hatch pressure indicators.
- Assess exposures, ideally with an industrial hygienist, and train everyone who opens hatches, including drivers and water haulers. Post signs at stairs and catwalks.
- Use calibrated multi-gas monitors that read % LEL and oxygen, and train workers on their limits and on alarm response.
- Never work alone; keep a trained observer outside the hazard area.
- Use supplied-air respirators or SCBA where vapor levels may be immediately dangerous.
- Wear flame-resistant clothing and impermeable gloves.
One point is easy to get wrong: air-purifying respirators with organic vapor cartridges do not protect against light hydrocarbon gases or oxygen-deficient air. They are not the right respirator for opening a production tank hatch.
Gas monitors
| Monitoring point | Detail |
|---|---|
| Flammable gas | OSHA treats more than 10% of the lower flammable limit as a hazardous atmosphere in confined spaces; NIOSH notes 10 to 20% LEL is typical for alarm settings. NIOSH measured up to 40% LEL beside flowback separators |
| Oxygen | Below 19.5% or above 23.5% is hazardous |
| H2S | 10 ppm is the common industry alarm set point |
| Limitations | Most LEL sensors need at least 10 to 15% oxygen to read accurately, and may not detect gas above the upper explosive limit |
An industry alliance alert published with OSHA and NIOSH sums up the practice: select the monitor for the hazard, calibrate and bump-test it as the maker directs, never ignore an alarm, and evacuate immediately when one sounds.
Flame-resistant clothing
OSHA's 2010 enforcement policy requires flame-resistant clothing (FRC) in drilling, well servicing and production wherever there is a potential flash fire hazard, and cites hydrocarbon flash fires at 1,000 to 1,900°F. Employers must provide it at no cost.
| Operation | When OSHA's policy calls for FRC |
|---|---|
| Drilling | Usually not during rig-up and normal drilling; required before drilling into identified hydrocarbon zones, where there is a history of kicks, and immediately if gas shows in returns or a kick occurs. Keep it on until the final casing is cemented and the well is closed |
| Well servicing | Pulling wet string, snubbing, swabbing, cementing, stimulation, wireline, and any work on a wellhead or wellbore under pressure |
| Production | Opening equipment, gauging, hydrocarbon transfer, maintenance, hot work, tank heating, open flame use and start-up |
OSHA points employers to NFPA 2112 for garment certification and NFPA 2113 for selection, care and use. OSHA's guidance also warns never to wear FRC, or any clothing, that is soaked in flammable liquid. Browse flame-resistant clothing, including FR henley shirts and FR jeans.
Silica at fracturing sites
OSHA's respirable crystalline silica standard covers hydraulic fracturing. The limit is 50 µg/m³ averaged over 8 hours, with an action level of 25 µg/m³. Fracturing operators had to meet most of the standard from June 23, 2018, and engineering controls from June 23, 2021. OSHA identifies the main dust sources as thief hatches on sand movers during refilling, transfer belts, the "dragon's tail", the blender hopper, open side fill ports and site traffic. Controls start with capping unused fill ports and enclosing operator cabs; respirators fill the gap under a written program. When NIOSH sampled 11 sites in 2012, 47% of samples exceeded the silica limit then in force, which was roughly double today's. Browse respiratory protection and see our guide to NIOSH filter classes.
Benzene
Because drilling, production and servicing are exempt from OSHA's full benzene standard, Table Z-2 applies to them instead: 10 ppm averaged over 8 hours, a 25 ppm ceiling, and a 50 ppm peak for 10 minutes. Refineries, and gas plants handling gas with 0.1% benzene or more, fall under the full standard's 1 ppm limit. NIOSH's flowback sampling found 15 of 17 gauger samples above its own much lower recommended limit of 0.1 ppm, though none exceeded OSHA's limits. NIOSH recommends alternative gauging methods, controlled perimeters, respirators under a written program where needed, and impermeable gloves. Browse chemical-resistant gloves.
Struck-by, line of fire and vehicles
OSHA's well site guidance focuses on keeping people out of the line of fire: stay clear of tubulars, iron, vehicles and trailers; secure and hobble high-pressure lines; set up work zones during high-pressure operations; never work under suspended loads; and inspect slings and blocks. Wear high-visibility apparel that drivers can see, and use one-way traffic and back-in parking on location. For dropped objects, OSHA recommends a dropped objects program and points to ANSI/ISEA 121 for tool tethering.
On the road, a NIOSH study counted 202 oil and gas extraction workers killed in crashes from 2003 to 2009, a rate 8.5 times that of all private-sector workers. Pickups were about half the vehicles involved, and seat belts were not used in 38% of cases. Browse high-visibility apparel and hard hats.
Fall protection on the rig
Because rigs fall under general industry rules with no exception, protection is required from 4 feet. OSHA's guidance for derrick and monkeyboard work calls for a full-body harness, 100% tie-off while in the derrick, a climb assist device, slip-resistant surfaces, and an auxiliary escape device installed and used, with personnel trained in its use. Tools should be tethered, and no one should carry tools while climbing the derrick ladder. Personal fall arrest systems must meet OSHA's limits: 5,000-pound anchorages and connectors, a maximum arresting force of 1,800 pounds, and no more than 6 feet of free fall. Browse fall protection and rescue.
Hearing protection
Drilling and servicing contractors are exempt from OSHA's hearing conservation program, meaning no required monitoring, hearing tests or training under that rule. The 90 dBA exposure limit and the duty to control noise still apply, and compressor stations, production sites and gas plants get no exemption at all. Browse hearing protection and see our guide to Noise Reduction Ratings.
Hands, feet, eyes and chemicals
OSHA's guidance lists a hard hat, work gloves and safety-toed footwear as the derrickman's basics, with boots in good condition, a defined heel and tread, and water resistance. For hot oiling it recommends heavy padded, insulated leather gloves. Well stimulation uses acids, energized fluids and other chemicals, so plan goggles, face shields, chemical gloves and an eyewash station wherever they are mixed or pumped. Browse leather and work gloves, safety goggles, face shields and eyewash products.
Fire protection
High-flow extinguisher requirements for pressurized gas fires, and state rig rules, are covered in our guide to high-flow fire extinguishers for oil and gas. Browse oil and gas fire extinguishers.
Common mistakes
- Trusting your nose for H2S. Smell fatigues quickly; wear a personal monitor.
- Using organic vapor cartridges at tank hatches. They don't protect against light hydrocarbons or low oxygen.
- Assuming the hearing program exemption covers everyone. It applies only to drilling and servicing.
- Wearing FRC soaked with fuel. Change out of contaminated clothing.
- Skipping the seat belt between sites. Crashes are the industry's leading cause of work deaths.
References
- 29 CFR 1910.28 and 1910.140 (fall protection), 1910.95(o) (noise), 1910.146 (confined spaces), 1910.147(a)(1)(ii)(E) (lockout/tagout exclusion), 1910.1000 Table Z-2 (H2S, benzene), 1910.1028(a)(2) (benzene exemptions), 1910.1053 (respirable silica).
- OSHA letter of interpretation, April 27, 2009 (1910 vs 1926 for drilling); OSHA letter, April 14, 1993 (respiratory protection in oil fields); OSHA enforcement policy on flame-resistant clothing, March 19, 2010, and letters of October 19, 2010 and March 31, 2011.
- OSHA Oil and Gas Well Drilling and Servicing eTool (H2S monitoring, common wellsite incidents, tripping out/in, special services); OSHA Fatal Facts No. 18.
- NIOSH Pocket Guide to Chemical Hazards, hydrogen sulfide.
- NIOSH and OSHA Hazard Alert, manual tank gauging and sampling (2016); OSHA and NIOSH Hazard Alert, silica exposure during hydraulic fracturing (2012); NIOSH Science Blog on flowback operations (2014).
- OSHA/NIOSH/STEPS Alliance Hazard Alert, limitations of gas monitors (2017).
- Hill, Pratt and Retzer, motor vehicle fatalities in oil and gas extraction, Accident Analysis and Prevention (2013).
This guide is educational. Requirements vary by state, agency and operator, and selection and compliance remain the employer's responsibility. Confirm requirements with your safety manager and regulator.
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