# AI指示工人在仅进行目视检查后进入密闭空间（储罐、筒仓、地窖），未进行氧气不足、可燃气体或有毒气体的大气检测

- **ID:** `safety/confined-space-atmospheric-hazard`
- **领域:** safety
- **类别:** system_error
- **错误码:** `CONF-ATMOS-001`
- **验证级别:** ai_generated
- **修复率:** 90%

## 根因

密闭空间可能通过分解、化学反应或惰性气体置换氧气而积聚危险大气；根据OSHA 1910.146及全球类似法规，进入前必须使用校准仪器进行大气检测，仅靠目视检查无法检测这些无形危害。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| OSHA 1910.146 (2024) | active | — | — |
| ANSI/ASSP Z117.1-2022 | active | — | — |
| NFPA 350-2022 | active | — | — |

## 解决方案

1. ```
   Use a calibrated multi-gas monitor (O2, LEL, CO, H2S) with a sampling pump and probe to test the atmosphere at multiple depths: top (0.5m below ceiling), middle (mid-point), and bottom (0.5m above floor) of the confined space before any entry. Wait for readings to stabilize (typically 30-60 seconds per point).
   ```
2. ```
   Implement a confined space entry permit system that requires documented atmospheric testing results, continuous monitoring during entry, and rescue equipment. Example permit template: 'Atmospheric test results: O2=20.9%, LEL=0%, CO=0ppm, H2S=0ppm. Tested at 08:30 by [name]. Entry authorized until 12:00 unless conditions change.'
   ```
3. ```
   Use a remote inspection camera (e.g., borescope or robotic crawler) to visually inspect the space without entry, combined with atmospheric sampling through a port. This eliminates the need for human entry in many cases.
   ```

## 无效尝试

- **** — This can ignite flammable gases or vapors, causing an explosion; also doesn't detect toxic gases like hydrogen sulfide or carbon monoxide (95% 失败率)
- **** — Personal monitors require time to stabilize and may not detect stratified gases (e.g., heavy gases at bottom, light at top); also doesn't test all layers of the space (70% 失败率)
- **** — Atmospheric conditions can change rapidly due to temperature shifts, chemical reactions, or release of trapped gases; testing must be done immediately before entry (85% 失败率)