# Fermentation Heating Tube Anti-Corrosion On-Site Safety & Hazard Isolation Specification ## Preface This specification coordinates the full anti-corrosion document system from Doc.33 to Doc.111. It unifies on-site hazard zoning, isolation protection, chemical operation safety, high-risk maintenance control and accident prevention standards for all heating tube anti-corrosion related work. It eliminates composite risks combining equipment corrosion hazard, chemical reagent danger and mechanical injury, and builds a safety barrier for all on-site anti-corrosion operation links. The production area is divided into three fixed hazard zones with distinct management rules. The medium circulation operation zone covers fermentation tanks and heating tube circulation loops; operators must wear anti-corrosion gloves and protective goggles during sampling and pipeline inspection, and any leakage of corrosive liquid shall be blocked and cleaned immediately to avoid splashing corrosion on equipment and personnel. The pickling and passivation operation zone stores concentrated acid, alkaline cleaning agents and corrosion testing reagents, equipped with emergency neutralization flushing devices, leakage collecting trays and exhaust ventilation systems; open transfer of undiluted high-concentration chemicals is forbidden without isolation shielding. The equipment maintenance isolation zone is used for heating tube disassembly, wall thickness testing and pipeline reconstruction. Before maintenance, all medium valves must be fully closed, blind plates installed and residual liquid completely drained to prevent sudden overflow of corrosive fluid during disassembly. Mandatory isolation procedures are implemented before all high-risk anti-corrosion operations. For routine online patrol, only visual observation and parameter reading are allowed without dismantling any sealing parts. For medium switching cleaning, pickling treatment and heating tube overhaul, formal work isolation tickets must be filled out, marking isolated equipment numbers, hazard types, operation duration and responsible persons. Isolation blind plates shall be tagged with warning labels, and lockout-tagout measures shall be adopted to prevent accidental valve opening by unrelated staff. Multiple linked heating loops need sequential isolation one by one instead of simultaneous partial isolation. Special safety control requirements are clarified for anti-corrosion chemical handling. Acid and alkali reagents are stored separately, and mixing different cleaning agents arbitrarily is prohibited to avoid toxic gas generation. Dilution must follow the rule of adding acid into water instead of pouring water into concentrated acid. Waste pickling liquid shall be collected into dedicated sealed containers for centralized neutralization treatment before discharge, and random pouring on the ground is forbidden to prevent ground corrosion and secondary pipeline contamination. After chemical operation, residual reagent residues on heating tube surfaces must be thoroughly rinsed with pure water. Emergency safety response measures are matched to corrosion leakage and chemical splashing incidents. On-site fixed emergency kits contain neutralizer, absorbent cotton, protective clothing and flushing water supply. In case of corrosive liquid splashing on skin or equipment, operators first cut off the medium source and start flushing facilities, then carry out hazard cleaning and equipment isolation. Any safety incident related to anti-corrosion work shall be recorded in dedicated safety ledgers, and joint analysis of corrosion and safety risks shall be conducted within 24 hours. All hazard zone layout drawings, isolation operation tickets, chemical usage safety records, safety inspection logs and emergency disposal archives are dual-backed and filed. Monthly joint inspections by equipment and safety departments check the implementation of isolation and protection standards, and rectify incomplete isolation or missing protective facilities within a time limit. This specification integrates equipment anti-corrosion management with on-site industrial safety control, eliminates overlapping hidden dangers of corrosion and personal injury, and completes the full-scene closed-loop management of the heating tube anti-corrosion system.
