Dual Version Acceptance Checklists for Four Types of Fermentation Anti-Corrosion Heating Tubes

Dual Version Acceptance Checklists for Four Types of Fermentation Factory Pre-Delivery Acceptance + On-Site Installation & Retrofit Acceptance of Anti-Corrosion Heating Tubes ## General Mandatory Acceptance Items (All four heating tube types must pass all items) 1. The goods are accompanied by the full production process records, third-party inspection reports, and complete original raw material batch certificates. 2. Hydraulic tightness test: Maintain a pressure of 1.2 times the design working pressure for 30 minutes without any pressure drop, seepage, or sweating. 3. Complete simulation of the safety interlock functions of the PLC, including the sensitive trigger, without any delay or failure. 4. A complete visual examination of the tube bundle's surface to rule out any surface defects, including fractures, scratches, blisters, and etching (100%). 5. Delivery of all supporting accessories in the full quantity as specified in the technical specifications of the bidding process 6. A continuous full-load medium trial run for a minimum of two batches after installation, with stable heating capacity and no abnormal alarms. 7. The full traceability audit requirements of GMP are met by the filing of all test data, inspection photos, and test reports. # Checklist for Factory Pre-Delivery Acceptance: Part One ## 1.1 316L Stainless Steel Heating Tube Pre-Delivery Inspection Items ☐ Documents pertaining to raw materials: Batch spectral component analysis reports and complete seamless 316L stainless steel MTC ☐ Complete ultrasonic wall thickness scanning: No local thinning exceeding 10% of nominal wall thickness, wall thickness tolerance ±5% ☐ Welding quality: Complete argon back shielding welding without internal oxidation; entirely mechanically polished with a smooth arc transition, free of pits, cracks, and black oxide layers. ☐ Passivation treatment: Secondary local pickling and passivation for all welds; integral pickling-passivation for the entire tube bundle with a uniform silver-gray chromium-rich passive film. Supporting accessories: Food-grade 316L stainless steel flanges that are homogeneous The exhaust branch pipe fittings and PTFE sealing membranes have been delivered in their entirety. ☐ Power cut-off triggered by interlock performance test: Alkali cleansing temperature interlock + dual alarm with sound and light at 60℃; heating power density is maintained at 1.0–1.5 W/cm² ☐ Packaging standard: All pipeline apertures are sealed by stainless steel blind plates; the product is wrapped in waterproof film with built-in desiccants and is kept separate from carbon steel parts during storage. ## Pre-Delivery Inspection of 1.2 Grade 2 Pure Titanium Heating Tube Items ☐ Raw material documents include the metal composition test report and factory inspection certificate for Grade 2 pure titanium ingots, as well as the management records of the fluorine-free raw material warehouse. ☐ Production environment record: Produced in a dedicated titanium workshop that is independent and does not cross-contaminate with carbon steel processing equipment. ☐ Welding and polishing: High-purity full argon shielding welding is used to prevent overheating and discolouration, and soft non-metallic polishing is used to prevent deep surface scratches. ☐ Electrochemical inspection: 100% full surface potential scanning, all areas exceeding the qualified standard range ☐ Surface appearance: The tube surface is free of residual fluorine release agent and milky white fluoride etching traces. ☐ Supporting accessories: Thickened integrated PTFE isolation sleeves, flange gaskets, nylon hoisting harnesses, and a CIP aeration assembly are included in the full supply. ☐ Interlock performance test: The automatic feeding and heating shutdown of the fluoride feeding pipeline are triggered by the dual mechanical interlock. The CIP aeration linkage ensures that the dissolved oxygen level in the circulating water is at least 8 mg/L. ☐ Packaging standard: Placed on non-metallic supports, wrapped in fluorine-free anti-scratch flexible film, and isolated from fluoride chemical storage areas ## 1.3 Quartz Anti-Corrosion Heating Tube Pre-Delivery Inspection Items ☐ Raw material documents: Raw material batch traceability records and high-purity fused quartz impurity component test report. Processing record: Comprehensive records of constant-temperature stress relief treatment following thread machining and cutting. Light transmission inspection: 100% full light screening, no internal bubbles, penetrating microcracks, thread edge chipping or surface frosting ☐ Low-pressure tightness test: Continuous circulation for 20 minutes without leakage at threaded sealing joints ☐ Interlock performance test: Hard mechanical interlock for alkali pipeline forced shutdown; heating rate limited to ≤0.4℃/min; circulating flow velocity capped to ≤0.6 m/s ☐ Supporting accessories: Multi-layer thick rubber shock absorption gaskets, plastic thread soft protective caps, and light transmission crack inspection tools are included ☐ Packaging standard: A single tube is wrapped in thick bubble wrap and placed in customised foam-lined shockproof wooden boxes with clear limited stacking layer marks. ## 1.4 Pre-Delivery Inspection of PFA Coated Heaters Items ☐ Documents pertaining to raw materials: Carbon steel substrate MTC, coating thickness test data, and food-grade PFA fluoroplastic certification ☐ Coating process record: A one-time integral coating forming log that does not require any secondary patch repairs; complete substrate rust removal and surface activation batch records; qualified coating adhesion peel sampling test ☐ Surface visual inspection: A 100% full-surface scan ensuring that there are no pinholes, penetrating scratches, blisters, uneven thickness, or yellow ageing discolouration ☐ Interlock performance test: Automatic power-off protection at a medium temperature of 95℃; however, the mandatory 40-minute post-CIP slow cooling program cannot be manually ignored. Supporting accessories: a temperature interlock controller, a multi-stage solid particle pre-filter, soft plastic maintenance tools, and plastic pipeline sealing plugs that have been entirely delivered. ☐ High-temperature ageing test: Qualified 95℃ constant temperature ageing simulation report without coating peeling or blister expansion ☐ Packaging standard: Wrapped in soft non-woven fabric, horizontally placed on plastic buffer pads, and kept away from high-temperature heat sources during transportation # Second Part: Checklist for Retrofit and On-Site Installation Acceptance ## 2.1 On-Site Acceptance of 316L Stainless Steel Heating Tubes Items ☐ Material compatibility: All pipe fittings, flanges, and brackets are constructed from 316L stainless steel, while all carbon steel contact surfaces are completely shielded by PTFE isolation strips to prevent direct metal contact. Installation layout: Independent auxiliary exhaust branch reserved at the highest point of each tube group, tube bundle inclination ≥12° On-site rework welding: All field welds are subjected to argon back shielding, with subsequent local corrosion and passivation, as well as a secondary visual inspection. ☐ Interlock debugging: The over-temperature simulation alarm test was successfully completed, and the alkali temperature interlock sensor was wired and calibrated. ☐ Ultrasonic wall thickness sampling inspection verifies that no new damage was generated during transportation and hoisting during the post-hoisting spot check. ☐ Pipeline circulation test: Exhaust valve unobstructed, no long-term air pocket retention during circulation ☐ Secondary hydraulic pressure test: No leakage at the welding seams and flange connections following pipeline installation ☐ Full-load trial run: Continuous 3-batch heating test, with heating power fluctuation maintained at ±5% ## 2.2 On-Site Acceptance of Pure Titanium Heating Tubes Items ☐ Isolation construction: The entire contact area between the titanium tube and the carbon steel supports/flanges is fully enclosed in intact PTFE isolation sleeves. ☐ Fluoride interlock: The dual mechanical interlock of the fluoride feeding pipeline has been installed, and the misfeeding forced shutdown simulation test has been successfully completed. ☐ CIP aeration linkage: The aeration system has been connected and debugged, and the dissolved oxygen level is consistently maintained above 8 mg/L during cleaning cycles. ☐ Post-installation surface inspection: Full surface potential re-scanning, no new hard scratches caused by hoisting ☐ elevating specification: The tube surface is free of any metal binding traces, and only nylon slings are employed for disassembly and elevating. ☐ Secondary hydraulic test: Following pipeline connection, all titanium heating loops successfully undergo a re-pressure tightness test. ☐ Full-load trial run: Continuous operation without rust sediment cascading at the tank outlet; fluoride detector without zero drift ## 2.3 On-Site Acceptance of Quartz Heating Tubes Items ☐ Shock absorption assembly: All clamping positions are equipped with brand-new, thick rubber shock absorption gaskets, and the support bases are fully fastened without any looseness. ☐ Alkali pipeline interlock: A mechanical interlock valve has been installed, and a manual forced opening simulation test has been conducted to affirm the complete liquid cut-off. ☐ Temperature regulation calibration: Heating rate limiter calibrated; actual temperature rise speed consistently maintained at ≤0.4℃/min. ☐ Flow velocity adjustment: Circulating pump frequency optimised; flow velocity limited to ≤0.6 m/s; no violent tube bundle vibration during continuous 4-hour operation. Post-installation defect screening: Re-inspection of the full light transmission without the presence of new microcracks or edge flaking from transportation/hoisting ☐ Each quartz tube group passes the low-pressure tightness retest. 20-minute low-pressure circulation leakage test ☐ Thermal shock simulation test: Multiple cold-hot cycle test without microcrack expansion ## 2.4 On-Site Acceptance of PFA Coated Heaters Items ☐ Pre-filter installation: A multi-stage solid particle pre-filter was installed at the front end of the pipeline, with new filter cartridges pre-assembled. Temperature interlock debugging: The temperature sensor is fully wired and calibrated, and an accurate automatic power-off protection is initiated at 95℃. CIP program linkage: The manual skip function is locked, and a 40-minute mandatory slow cooling module is bound to a high-temperature cleaning cycle. Anti-scratch protection: Soft plastic buffer pads are used to line all pointed metal support edges to prevent friction damage to the coating. ☐ Hydraulic retest: Pressure holding test to eliminate concealed substrate leakage under damaged coating areas ☐ Post-installation surface scan: Full coating visual inspection without new scratches, blisters, or peeling during installation ☐ Full-load trial run: Maintaining a medium stable operating temperature below 90℃ without any anomalous power consumption surge # Third Part: Confirmation List for Non-Conformity Disposition ☐ Minor defects: Document the rectification plan, deadline, and responsible individual; sign acceptance only after the re-inspection has been completed. ☐ Major critical defects (material substitution, failed interlock, structural crack, penetrating coating damage): Either reject the entire batch or unconditionally disassemble and replace the entire tube bundle. ☐ Two consecutive failed re-inspections: Activate third-party independent testing, with the supplier responsible for all inspection expenses. ☐ Acceptance signature rule: The acceptance form may only be signed after all items have been marked as "Pass." It is prohibited to accept partially qualified single items separately. # Fourth Part: Post-Acceptance Confirmation Checklist Archiving ☐ Batch inspection reports and raw material qualification certificates ☐ Original test data documents and factory pre-delivery inspection photos ☐ Data from the full-load trial run curve and on-site installation acceptance forms ☐ Secondary hydraulic pressure test reports and interlock linkage debugging records ☐ A comprehensive operation standard operating procedure (SOP), preventive maintenance plan, and fault troubleshooting manual ☐ A spare parts delivery checklist and Official Warranty document of dedication ☐ The full life cycle equipment file permanently stores the complete archives in both paper and electronic dual-version format.