H2S Documentation Guide
Hydrogen sulfide (H2S) documentation is among the most scrutinized records during oilfield contractor audits. Texas Railroad Commission Rule 36, operator requirements, equipment instructions, respiratory protection rules, and company procedures can each create different documentation duties. Together, a site's evidence may include detector testing and calibration, wind and muster information, training records, contingency plans, and emergency drill records. This guide shows what separates weak field notes from retrievable, specific evidence while keeping each requirement tied to its actual source.
Bad Log vs. Audit-Ready Log
The difference between passing and failing an H2S documentation audit often comes down to specificity. Here's what auditors look for:
Will fail operator audit
Date: 1/15/25
Location: Site A
Calibration: ✓ Done
Wind: Light
Muster: Parking lot
Participants: Crew
Drill Time: ~5 min
- ❌ Generic location (which Site A?)
- ❌ No calibration details or certificate
- ❌ Wind direction not specified
- ❌ Muster point not GPS-specific
- ❌ No participant names
- ❌ Approximate drill time
Stronger audit evidence
Date: 2025-01-15 0630
Location: API #42-103-12345
Calibration: BW GasAlert #SN-4521, 25ppm H2S gas (exp: 03/2025), Cal date: 01/01/25
Wind: NNW 8mph @ 0630
Muster: 31.456°N, 102.789°W (200m SE)
Participants: J. Smith, R. Jones, M. Davis (signatures attached)
Drill Time: 4:32 (alarm-to-headcount)
- ✓ Well API# for exact location
- ✓ Detector S/N, gas conc., expiration
- ✓ Wind direction + speed + time
- ✓ GPS coordinates for muster
- ✓ All participant names
- ✓ Precise drill time
Calibration vs. Bump Test Requirements
These are different tests with different purposes. Auditors check for both.
Functional verification before each use
A bump test verifies the detector responds to gas but doesn't verify accuracy. Quick (<1 min) check that sensors are functional.
Document:
- • Date and time
- • Detector ID/serial number
- • Pass/Fail result
- • Tester name
- • Action if failed (remove from service)
Accuracy verification with certified gas
Calibration adjusts detector readings to match known gas concentrations. Ensures accuracy of readings. Requires certified calibration gas.
Document:
- • Detector model and serial number
- • Calibration gas concentration (ppm)
- • Calibration gas lot # and expiration
- • Pre-calibration readings
- • Post-calibration readings
- • Technician name and certification
Common Audit Finding
"Calibration checkbox marked but no supporting certificate or calibration gas details recorded." Checking a box isn't documentation. Auditors want to see the gas concentration, lot number, and expiration date.
Wind Direction & Muster Point Documentation
Wind direction determines evacuation routes. Document it properly or your H2S contingency plan is incomplete.
Required Wind Documentation Fields
Direction
Compass direction (N, NNE, NE, etc.) wind is coming FROM
Speed
Wind speed in mph. Variable winds require more frequent checks.
Time of Reading
When the wind reading was taken. Recheck if conditions change.
Resulting Muster Point
GPS coordinates or clear landmark UPWIND of operations.
Good Muster Point Documentation
- ✓ GPS coordinates (31.456°N, 102.789°W)
- ✓ Distance and direction from wellhead
- ✓ Photo of location with windsock visible
- ✓ Updated when wind shifts >45°
Bad Muster Point Documentation
- ✗ "The parking lot" (which parking lot?)
- ✗ "By the gate" (no GPS or distance)
- ✗ Same muster point regardless of wind
- ✗ No photo or visual reference
H2S Training Expiration Management
Training gaps are the most common H2S documentation failure. Here's how to track certifications properly.
Training Matrix Requirements
| Employee | Course Type | Completed | Expires | Status |
|---|---|---|---|---|
| John Smith | H2S Awareness (IADC) | 2024-03-15 | 2026-03-15 | Current |
| Mike Davis | H2S Awareness (SafeLand) | 2023-02-01 | 2025-02-01 | Expiring |
| Robert Jones | H2S Awareness | 2022-06-10 | 2024-06-10 | Expired |
Days Before
Start renewal process 60 days before expiration
Days Warning
Automated alerts at 30 days remaining
Days Grace
No grace period. Expired means off H2S sites
Texas RRC Rule 36 Documentation
Texas Railroad Commission Statewide Rule 36 sets H2S safety requirements for covered Texas operations. Applicability depends on the operation, H2S concentration, and radius of exposure.
- Applicable written contingency plan, procedures, and call list
- Service-company certification that assigned personnel are trained
- Training schedules and course outlines available for Commission review
- Certificates of compliance for covered operations
- Required H2S release and accident notifications or reports
- Plan updates and public-alerting evidence when the contingency-plan provisions apply
The contingency-plan and additional-control provisions apply when any of these Rule 36 conditions is met:
- 100 ppm ROE:Exceeds 50 feet and includes a public area other than a public road
- 500 ppm ROE:Exceeds 50 feet and includes any part of a public road
- 100 ppm ROE:Exceeds 3,000 feet
Frequently Asked Questions
Digitize Your H2S Documentation
BasinCheck captures detailed H2S field records with GPS coordinates, automatic timestamps, and photo attachments. Configure the forms and training alerts around the rules, operator requirements, and procedures that apply to your work.