# Fermentation Heating Tube Anti-Corrosion Third-Party On-Site Supervision & Witness Inspection Specification ## Preface This specification (Doc.149) acts as a supplementary compliance document for the whole anti-corrosion management system from Doc.33 to Doc.148. It standardizes the whole-process management of third-party supervision and witness inspection covering pipeline construction, equipment overhaul, non-destructive testing, material sampling verification and cleaning effect acceptance. It regulates access approval, on-site process supervision, witness record confirmation, result review and file archiving of external supervisory institutions, prevents irregular construction, false inspection data and unqualified acceptance, ensures all key anti-corrosion links are objectively and fairly verified, and reinforces external supervision constraints on internal standardized operation. ## 1. Qualification Access and Supervision Scope Confirmation Before introducing third-party supervision services, the enterprise reviews institutional qualification, inspection certification scope, supervisor practicing certificates and similar industrial service experience in accordance with Doc.124 supplier management rules. Authorized supervision scope includes welding construction witness, pipeline pressure test witness, heating tube wall thickness random inspection, anti-corrosion coating adhesion test, cleaning residue sampling witness and retired equipment material identification. The two parties sign service agreements and confidentiality clauses to restrict unauthorized disclosure of internal process data. Supervisors without approved qualifications are prohibited from participating in any on-site witness activities. ## 2. Pre-Construction Scheme Review and On-Site Access Management Third-party supervisors must review construction schemes, anti-corrosion process parameters and safety isolation measures formulated by the enterprise before entering the site. All personnel need to receive internal safety training, wear designated visitor identification and be accompanied by full-time internal management staff during on-site inspection. Supervisors shall abide by factory on-site visual management rules in Doc.135, take photos and record data only at approved positions, and shall not arbitrarily adjust equipment operating status or interfere with normal production arrangements. ## 3. Key Process Witness and Real-Time Record Confirmation All critical anti-corrosion links must be witnessed by assigned third-party personnel. Before pressure testing, supervisors verify pipeline isolation status, material consistency and instrument calibration validity. During sampling inspection, they witness the whole process from sampling, sample sealing to delivery for testing to avoid sample substitution or contamination. Every witness activity requires filling in unified record forms, signed jointly by internal responsible persons and third-party supervisors, with on-site photos attached as objective evidence. Records cannot be modified or supplemented afterward without formal written explanation. ## 4. Abnormality Notification, Result Review and Rectification Supervision If third-party supervision finds unqualified construction, material mismatch or non-compliant anti-corrosion operation, they shall issue a non-conformity notice immediately and suspend relevant working procedures. The enterprise organizes root cause analysis and rectification, and reapplies for witness inspection only after hidden dangers are eliminated. All inspection reports issued by third parties must be reviewed by the equipment and quality departments to check data rationality, report format standardization and signature completeness before being incorporated into equipment full-life archives. Suspicious abnormal test results require repeat sampling and re-inspection. ## 5. Post-Service File Archiving and Supplier Performance Evaluation All supervision contracts, witness records, inspection reports, non-conformity rectification materials and visitor training archives are stored in dual electronic and paper forms as confidential files in line with Doc.137 requirements. After each service cycle, the enterprise evaluates third-party institutions from dimensions of service timeliness, report authenticity, on-site compliance and rectification supervision efficiency. High-quality suppliers are retained for long-term cooperation, while those with falsified data or repeated irregularities are eliminated from the approved supplier list. Typical supervision non-conformity cases are sorted into the anti-corrosion knowledge base for internal training. ## 6. System Value This specification introduces objective external supervision to constrain internal operation risks, eliminates subjective acceptance loopholes in key anti-corrosion links, improves the authenticity and credibility of inspection data for regulatory and customer audits, and further perfects the multi-dimensional, open and compliant closed-loop anti-corrosion management system for fermentation heating tubes.
