In the industrial field, the safe concentration limit of hydrogen sulfide (H₂S) must strictly follow the occupational exposure standards, while also taking into account the specific requirements of different industries.
1.The oil and gas industry
Offshore drilling platforms/refineries:
- Alarm threshold: Usually, two levels of alarms are set:
- Level 1 alarm: 10 ppm (indicating leakage risk).
- Secondary alarm: 15 ppm (Forced evacuation).
Confined Spaces (such as storage tanks) : Before entry, detection is required. The H₂S concentration must be less than 5 ppm and continuously monitored.
2.Sewage treatment and chemical industry
Open area: ≤10 ppm is allowed (but a portable detector must be worn).
Sludge treatment room: The concentration may rise sharply. Fixed detectors and ventilation systems are required.
Chemical plant (sulfide production) : Implement the 1 ppm TWA standard of ACGIH (due to the higher risk of long-term exposure).
3.Mining and tunneling operations
Underground operations: Emergency ventilation must be initiated when the H₂S concentration is ≥5 ppm, and operations should be halted when it is ≥10 ppm.
4.Protective Equipment and Monitoring Requirements
(1).Testing equipment:
Portable detector: For personal use, real-time alarm (recommended range: 0-100 ppm).
Fixed detector: Installed in areas prone to leakage (such as pump rooms and storage tanks), it is linked to the ventilation system.
(2).Respiratory protection:
10-50 ppm: Half mask + acidic gas filter cartridge (such as 3M 60926).
>50 ppm: A positive pressure air breathing apparatus (SCBA) or a supplied long tube breathing apparatus must be used.
(3).Training and Practice:
All personnel must master the physical and chemical properties of H₂S, escape routes and cardiopulmonary resuscitation (CPR) skills.
Portable hydrogen sulfide gas detector plays an irreplaceable role in fields such as industry, environmental protection, and public security. Their core value lies in real-time monitoring of the concentration of hazardous gases, preventing serious accidents such as poisoning, explosion, and fire, and ensuring the safety of personnel and the stable operation of production facilities.