Accident Warning: LOTO Failure Resulting in Major Casualties (2025–2026)

1. Jiangnan Shipbuilding's "9.4" Nitrogen Asphyxiation Accident (2025.9.4)
Event: The V6 valve in the 4th cargo hold of the under-construction ship was not fully closed (opening degree 13.3%), and nitrogen leakage caused the death of 3 people.
Core issue: The LOTO physical isolation failed, and the double-person confirmation and lock-out/tag-out were not carried out. Only manual memory was relied on.
Industry impact: It urges the shipbuilding, heavy industry, and chemical industries to strengthen the control of LOTO for key valves and promote mechanical locks and electronic status monitoring.
2. Multiple equipment maintenance casualties accidents (2025–2026)
Common reasons: Failure to implement LOTO, missing locks, simplified procedures, and inadequate training, resulting in accidental equipment startup / energy release.
Regulatory signal: The emergency management department has listed the failure to implement LOTO as a major accident hazard and strictly investigates "using tags instead of locks" and "unlocked operations".

Updates to Regulations and Standards (2024–2026)

1. China National Standards Implementation
GB/T 44686-2024 "Mechanical Safety - General Principles for Energy Control" (implemented on September 29, 2024)
Clarifies the requirements for energy identification, isolation, release, and control throughout the mechanical lifecycle.
Strengthen the mandatory application of LOTO in commissioning, maintenance, and repair, and require equipment-level isolation procedures and annual audits.
GB/T 45111-2024 "Guidelines for Layer of Protection Analysis (LOPA), Safety Integrity Level (SIL) Classification and Quality Control for Validation" (implemented on July 1, 2025)
Includes LOTO in Layer of Protection Analysis (LOPA) to enhance safety integrity in high-risk industries such as chemicals and power.
2. OSHA in the United States strengthens LOTO enforcement (2025–2026)
LOTO (29 CFR 1910.147) has been among OSHA's top ten frequently violated standards for consecutive years, with over 2,100 violations in the fiscal year 2025.
2026 Focus: More rigorous inspections, higher fines, mandatory digital record-keeping, and strict investigation of missing procedures, insufficient training, and absence of annual audits. 
Clarification: Locks take precedence over tags. Tags are only allowed when locks cannot be installed, and additional protective measures are required.