AC DataCenter
Confined-space pipe welding — real accidents & risk assessment
Real Confined-space pipe welding accident cases (AI-cleaned) plus example risk assessment, JSA and TBM. Free, no sign-up.
Real AI output
Sign up to auto-generate real outputs like these
Below are actual outputs generated by our AI engine (sample). After sign-up they are generated for your exact task.
Sample for: Confined-space pipe welding
6
Hazards
6
Unit tasks
7
Related laws
Criminal 5
Full risk assessment
| Unit task | Hazard / Cause | Current controls | Risk (F×S) | Controls | After | Legal |
|---|---|---|---|---|---|---|
| Pre-entry atmospheric testing | Oxygen deficiency or toxic gas exposure on entry without adequate testing Atmospheric testing skipped or meter not calibrated Asphyxiation / Toxic Exposure | Verbal reminder to test before entry | 10· High 2×5 |
| 5· Medium | Art. 620 환기 등 Criminal |
| Ventilation setup | Inadequate ventilation allows hazardous atmosphere to build up Single blower inadequate for space volume; no continuous monitoring Asphyxiation / Toxic Exposure | Portable blower | 8· Medium 2×4 |
| 3· Low | 제637조 설비 개조 등의 작업 Criminal |
| Entry & pipe welding | Accumulation of welding fumes and flammable gas causes explosion or fire Insufficient ventilation during welding; gas supply valve not fully closed Fire / Explosion | Ventilation blower running | 8· Medium 2×4 |
| 3· Low | Art. 619 밀폐공간 작업 프로그램의 수립ㆍ시행 Criminal |
| Entry & pipe welding | Welder asphyxiated by welding fumes in confined space Inadequate exhaust extraction; fume plume accumulates near welder's breathing zone Asphyxiation / Toxic Exposure | Blower ventilation | 12· High 3×4 |
| 3· Low | Art. 629 용접 등에 관한 조치 Criminal |
| Continuous monitoring during work | Atmospheric condition changes without warning after entry Gas released from pipe contents; gas meter battery dies Asphyxiation / Toxic Exposure | Periodic manual checks | 6· Medium 3×2 |
| 4· Medium | Art. 619 밀폐공간 작업 프로그램의 수립ㆍ시행 Criminal |
| Emergency rescue preparation | Rescuer enters confined space without proper equipment and becomes secondary casualty Untrained rescuer rushes in without respiratory protection Asphyxiation / Toxic Exposure | General first-aid training | 6· Medium 3×2 |
| 1· Low | Art. 620 환기 등 Criminal |
Legal compliance (OSH rules)
Art. 618Confined Space Entry Permit
CriminalMust-check
Art. 619Pre-entry Atmospheric Testing
CriminalMust-check
Art. 620Ventilation Requirements
CriminalMust-check
Art. 621Entry Attendant Requirement
CriminalMust-check
Art. 622Rescue Equipment Provision
CriminalMust-check
Art. 93PPE Provision
Art. 38Employer Duty to Prevent Hazards
Grounding real accidents
Welder entered a storage tank without atmospheric testing; collapsed within 2 min due to hydrogen sulfide exposure.
⚠ Toxic gas (H₂S) — no pre-entry testing
Three workers died in a confined sewer: first worker collapsed, second and third entered without PPE to rescue and also succumbed to oxygen-deficient atmosphere.
⚠ Oxygen deficiency; untrained non-entry rescue failure
Welder ignited residual acetylene in a pipe section; explosion blew out the end cap, fracturing the welder's arm and causing burns.
⚠ Residual flammable gas in pipe before welding