Standard Acceptance Checklist for Four Types of Fermentation Anti-Corrosion Heating Tubes (Factory Pre-Delivery + On-Site Installation Acceptance Dual Version)

# Standard Acceptance Checklist for Four Types of Fermentation Dual Version Anti-Corrosion Heating Tubes (Factory Pre-Delivery + On-Site Installation Acceptance) ## Common Clauses of General Acceptance (All Four Types Must Pass) 1. The goods were delivered with a comprehensive raw material batch certificate, third-party test report, and production processing log. 2. Hydraulic tightness test: pressure holding for 30 minutes at 1.2 times the design pressure, with no pressure decrease, seepage, or sweating. 3. Simulation of the PLC interlock function, ensuring that sensitive triggering occurs without delay or failure. 4. A thorough visual examination of the tube bundle's surface to detect any fractures, scratches, blisters, etching, or other defects. 5. A complete set of supporting accessories was delivered in accordance with the technical specifications of the bidding process. 6. After the installation, a full-load medium trial run was conducted for two batches, resulting in stable heating power and no anomalous alarms. 7. The GMP audit traceability is ensured by the filing of all inspection data, photos, and test records. ## Checklist for Factory Pre-Delivery Acceptance, Part 1 ### 1.1 Pre-Delivery Check Items for 316L Stainless Steel Heating Tubes Raw material: Seamless 316L stainless steel MTC with a comprehensive batch spectral analysis report □ Wall thickness was measured using full ultrasonic scanning, with a tolerance of ±5% and no local thinning exceeding 10%. standard thickness □ Weld: Complete argon back protection welding, no internal oxidation; full mechanical polishing, smooth arc transition, no pits, cracks, or black oxide □ Post-weld secondary local pickling and passivation; uniform silver-gray passive film; integral passivation of the overall tube bundle □ Supporting accessories: Food-grade, homogeneous 316L flanges Exhaust branch pipe connectors and PTFE gaskets are fully assembled. □ Performance test: At 60℃, the alkali temperature interlock initiates a power-off and sound-light alarm, while the power density is maintained at 1.0–1.5 W/cm². □ Packaging: Blind plates sealed for all ports, separated from carbon steel parts, waterproof plastic film + desiccant ### Pre-Delivery Check Items for 1.2 Pure Grade 2 Titanium Heating Tubes Raw material: fluorine-free raw material warehouse management record, Grade 2 pure titanium ingot inspection certificate □ Production record of a dedicated titanium workshop that is independent, with no cross-contamination with carbon steel processing. □ Weld: High-purity argon full shielding, no overheating discolouration; soft polishing; no deep surface scratches □ The electrochemical potential scanning is conducted on the entire surface, and all areas are within the qualified standard range. □ The tube surface is free of residual fluorine release agent, and there are no milky white fluoride etching traces. □ Supporting accessories: Thickened integral PTFE isolation sleeves, flange gaskets, nylon hoisting pulleys, and a complete aeration assembly □ Performance test: Automatic closure of the dual fluoride pipeline mechanical interlock; CIP aeration linkage to ensure that the dissolved oxygen level remains at or above 8 mg/L □ Packaging: Isolated from the fluorine chemical storage area, non-metallic bracket placement, fluorine-free soft anti-scratch film wrapping ### 1.3 Quartz Anti-Corrosion Heating Tube Items for Pre-Delivery Inspection □ Raw material: Batch traceability record, impurity component test report for high-purity fused quartz. □ Record of constant-temperature stress relief treatment following thread processing and cutting Full inspection of 100% light transmission: No internal bubbles, penetrating microcracks, thread edge chipping or surface frosting □ Low-pressure water tightness test: 20-minute circulation, no leakage at thread sealing junctions □ Performance interlock test: Alkali pipeline hard mechanical interlock forced closure; heating rate limited to ≤0.4℃/min; flow velocity limit ≤0.6 m/s Supporting accessories: A complete set of light gearbox inspection tools, multi-layer thick rubber shock absorption gaskets and plastic thread soft protective covers □ Packaging: Customised foam-lined shockproof wooden box, single tube enclosed with thick bubble wrap, and limited stacking layers clearly marked ### Pre-Delivery Check Items for 1.4 PFA Coated Heaters Raw material: Certification for food-grade PFA fluoroplastics, certificate of mill test for carbon steel substrates, and data on coating thickness. □ A single integral coating moulding record, without the need for secondary patch repair products □ Coating adhesion sampling peel test qualified, substrate pre-treatment (rust removal, activation) batch log □ Visual scan of the entire surface: No pinholes, penetrating scratches, blisters, uneven thickness, or yellowing □ Performance interlock test: The system will automatically power off at 95℃ in the event of an over-temperature condition; the 40-minute post-cleaning slow cooling program is mandatory and cannot be bypassed. □ Accompanying accessories: Temperature interlock controller, solid particle pre-filter, flexible plastic overhaul tools, and plastic sealing plugs; complete □ Report of high-temperature ageing simulation test (constant temperature of 95℃, no blister aggravation or coating peeling) Packaging: Soft non-woven fabric wrapping, horizontal placement on plastic buffer pads and protection from high-temperature heat sources during transportation ## Checklist for On-Site Installation and Retrofit Acceptance in Part 2 ### 2.1 On-Site Acceptance Items for 316L Stainless Steel Heating Tubes □ The carbon steel components are completely isolated by PTFE strips to prevent direct contact, while all pipe connectors, flanges, and brackets are made of 316L stainless steel. □ Independent auxiliary exhaust branch installed at the highest point of each group, tube bundle installation inclination ≥12° □ Argon back protection, post-weld local pickling passivation, and visual re-inspection were completed during the weld rework on site. □ The simulation over-temperature test was successfully completed, and the alkali temperature interlock sensor was wired and debugged. Ultrasonic wall thickness spot check on the affixed tube bundle; no new damage was observed during transportation and hoisting. □ The exhaust valve was unobstructed following the pipeline connection, and there were no stagnant air pockets during the circulating test. □ After installation, the hydraulic pressure was retested in full, and there was no leakage at the welding and flange positions. □ The heating power fluctuation was maintained within ±5% during the full-load trial run for three samples. ### 2.2 On-Site Acceptance Items for Pure Titanium Heating Tubes □ Complete PTFE isolation sleeves are used to completely encase all contact points between titanium tube and carbon steel supports/flanges. □ The fluoride feeding pipeline has the dual mechanical interlock installed, and the misfeeding simulation shutoff test has been successfully completed. □ The CIP aeration system was effectively connected, and the dissolved oxygen detection value was consistently maintained at or above 8 mg/L. □ No scratch damage generated during hoisting, full surface potential re-scanning after installation □ Metal wire binding traces are not present on the tube surface; nylon slings are exclusively employed for disassembly elevating. □ Hydraulic tightness retest of all titanium loops following pipeline connection □ Continuous full-load trial run, fluoride detector zero drift-free, no rust sediment at tank bottom outlet ### 2.3 Quartz Heating Tube On-Site Acceptance Items □ The clamping positions are furnished with brand-new, thick rubber shock absorption gaskets, and the supports are securely fastened. □ A manual forced opening simulation test was conducted to confirm the liquid cut-off in the alkali pipeline mechanical interlock valve. □ Heating rate limiter calibrated; actual temperature rise speed stably regulated at ≤0.4℃/min □ The flow velocity was maintained at a minimum of 0.6 m/s, and the circulation pump frequency was adjusted to prevent violent tube bundle vibration during the four-hour continuous operation. Re-inspection of the full light transmission after installation; no new microcracks or edge chipping induced by transportation/hoisting □ Retest of the confinement of low-pressure water circulation for each quartz group □ With no fracture expansion, the thermal shock cycle simulation test was successfully completed. ### 2.4 On-Site Acceptance Items for PFA Coated Heaters □ Multi-stage solid particle pipeline front-end filter cartridge and prefilter attached □ Automatic power-off protection is triggered accurately at 95℃ by a temperature interlock sensor that has been wired and calibrated. □ CIP program is inextricably linked to the mandatory 40-minute slow cooling module and cannot be manually bypassed Soft plastic buffer pads are used to line all sharp metal support edges, eliminating the danger of friction contact with the coating. After installation, the full surface coating was visually rescanned to ensure that there were no new blemishes or blisters. □ Retesting hydraulic tightness to detect concealed substrate leakage in areas damaged by coating □ Medium-long-term operating temperature stable below, full-load trial run Not a single anomalous power surge, 90℃ ## Confirmation List for Non-Conformity Disposal in Part 3 □ Minor defects: Document the rectification plan, re-inspection time, and responsible individual, and sign off after the retest is successful. □ Major defects (material substitution, unqualified interlock, structural damage, coating penetration): Reject the entire batch or disassemble and replace the tube bundle entirely. □ Failure to retest twice: Initiate a third-party independent inspection, with the supplier responsible for all testing expenses. □ Acceptance is only signed after all items are marked "Pass"; partial qualified single items cannot be accepted separately. ## Part 4 Archive Filing Confirmation Items Following Acceptance Pass □ Batch test reports and raw material certification □ Data recording and photographs of factory pre-delivery inspections □ Trial run curve data, on-site installation acceptance test forms □ Reports on hydraulic pressure testing and interlock linkage debugging □ Comprehensive manuals for fault troubleshooting, maintenance, and operation □ Warranty commitment document, spare parts delivery checklist □ The full-life-cycle archives of all equipment, including paper and electronic dual-version files