# Standard Acceptance Checklist for Four Types of Fermentation Anti-Corrosion Heating Tubes (Factory Pre-Delivery + On-Site Installation Acceptance Dual Version) ## General Acceptance Common Clauses (All Four Types Must Pass) 1. Complete raw material batch certificate, third-party test report, production processing log delivered with goods 2. Hydraulic tightness test: 1.2 times design pressure, 30 min pressure holding, no pressure drop, seepage or sweating 3. PLC interlock function simulation test, sensitive triggering without delay or failure 4. Visual full inspection of tube bundle surface for cracks, scratches, blisters, etching and other defects 5. Complete set of supporting accessories delivered in full quantity as per bidding technical specifications 6. Post-installation full-load medium trial run for 2 batches, stable heating power without abnormal alarms 7. All inspection data, photos and test records filed for GMP audit traceability ## Part 1 Factory Pre-Delivery Acceptance Checklist ### 1.1 316L Stainless Steel Heating Tube Pre-Delivery Check Items □ Raw material: Seamless 316L stainless steel MTC + batch spectral analysis report complete □ Wall thickness full ultrasonic scanning, tolerance ±5%, no local thinning exceeding 10% nominal thickness □ Weld: Full argon back protection welding, no internal oxidation; full mechanical polishing, smooth arc transition, no pits/cracks/black oxide □ Post-weld secondary local pickling & passivation; overall tube bundle integral passivation, uniform silver-gray passive film □ Supporting accessories: Homogeneous 316L flanges, food-grade PTFE gaskets, exhaust branch pipe fittings complete □ Performance test: Alkali temperature interlock triggers power-off + sound-light alarm at 60℃; power density locked 1.0–1.5 W/cm² □ Packaging: Waterproof plastic film + desiccant, blind plates sealed for all ports, separated from carbon steel parts ### 1.2 Pure Grade 2 Titanium Heating Tube Pre-Delivery Check Items □ Raw material: Grade 2 pure titanium ingot inspection certificate, fluorine-free raw material warehouse management record □ Independent dedicated titanium workshop production record, no cross-contamination with carbon steel processing □ Weld: High-purity argon full shielding, no overheating discoloration; soft polishing without deep surface scratches □ 100% full surface electrochemical potential scanning, all areas reach qualified standard range □ No milky white fluoride etching traces, no residual fluorine release agent on tube surface □ Supporting accessories: Thickened integral PTFE isolation sleeves, flange gaskets, nylon hoisting slings, aeration assembly complete □ Performance test: Dual fluoride pipeline mechanical interlock automatic shutdown; CIP aeration linkage to maintain dissolved oxygen ≥8 mg/L □ Packaging: Fluorine-free soft anti-scratch film wrapping, non-metallic bracket placement, isolated from fluorine chemical storage area ### 1.3 Quartz Anti-Corrosion Heating Tube Pre-Delivery Check Items □ Raw material: High-purity fused quartz impurity component test report, batch traceability record □ Constant-temperature stress relief treatment record after cutting and thread processing □ 100% light transmission full inspection: No internal bubbles, penetrating microcracks, thread edge chipping, surface frosting □ Low-pressure water tightness test: 20 min circulation, no leakage at thread sealing joints □ Performance interlock test: Alkali pipeline hard mechanical interlock forced shutdown; heating rate limited ≤0.4℃/min; flow velocity limit ≤0.6 m/s □ Supporting accessories: Multi-layer thick rubber shock absorption gaskets, plastic thread soft protective caps, light transmission inspection tools complete □ Packaging: Single tube wrapped with thick bubble wrap, customized foam-lined shockproof wooden box, limited stacking layers marked clearly ### 1.4 PFA Coated Heater Pre-Delivery Check Items □ Raw material: Food-grade PFA fluoroplastic certification, carbon steel substrate mill test certificate, coating thickness test data □ One-time integral coating molding record, no secondary patch repair products □ Substrate pre-treatment (rust removal, activation) batch log, coating adhesion sampling peel test qualified □ 100% full surface visual scan: No pinholes, penetrating scratches, blisters, uneven thickness, yellowing □ Performance interlock test: Over-temperature automatic power-off at 95℃; mandatory 40 min post-cleaning slow cooling program cannot be skipped □ Supporting accessories: Temperature interlock controller, solid particle pre-filter, soft plastic overhaul tools, plastic sealing plugs complete □ High-temperature aging simulation test report (95℃ constant temperature, no coating peeling or blister aggravation) □ Packaging: Soft non-woven fabric wrapping, horizontal placement on plastic buffer pads, away from high-temperature heat sources during transportation ## Part 2 On-Site Installation & Retrofit Acceptance Checklist ### 2.1 316L Stainless Steel Heating Tube On-Site Acceptance Items □ All pipe fittings, flanges and brackets are 316L stainless steel; carbon steel parts fully isolated by PTFE strips without direct contact □ Tube bundle installation inclination ≥12°, independent auxiliary exhaust branch installed at each group's highest point □ Weld rework on site completed argon back protection, post-weld local pickling passivation and visual re-inspection □ Alkali temperature interlock sensor wired and debugged, simulation over-temperature test passed □ Ultrasonic wall thickness spot check on installed tube bundle, no new damage during transportation and hoisting □ Exhaust valve unobstructed after pipeline connection, no dead air pockets during circulating test □ Full hydraulic pressure retest after installation, no leakage at welding and flange positions □ Full-load trial run for 3 batches, heating power fluctuation controlled within ±5% ### 2.2 Pure Titanium Heating Tube On-Site Acceptance Items □ All contact positions between titanium tube and carbon steel supports/flanges fully wrapped by complete PTFE isolation sleeves □ Fluoride feeding pipeline dual mechanical interlock installed, misfeeding simulation shutdown test passed □ CIP aeration system linked successfully, dissolved oxygen detection value stably maintained above 8 mg/L □ Full surface potential re-scanning after installation, no scratch damage generated during hoisting □ Nylon slings only used for disassembly hoisting, no metal wire binding traces on tube surface □ Hydraulic tightness retest of all titanium loops after pipeline connection □ Full-load continuous trial run, no rust sediment falling at tank bottom outlet, fluoride detector zero drift-free ### 2.3 Quartz Heating Tube On-Site Acceptance Items □ All clamping positions equipped with brand-new thick rubber shock absorption gaskets, supports fastened without looseness □ Alkali pipeline mechanical interlock valve installed, manual forced opening simulation test to confirm liquid cut-off □ Heating rate limiter calibrated, actual temperature rise speed stably controlled ≤0.4℃/min □ Circulating pump frequency adjusted, flow velocity maintained ≤0.6 m/s, no violent tube bundle vibration during 4h continuous operation □ Full light transmission re-inspection after installation, no new microcracks or edge chipping caused by transportation/hoisting □ Low-pressure water circulation tightness retest for each quartz group □ Thermal shock cycle simulation test passed without crack expansion ### 2.4 PFA Coated Heater On-Site Acceptance Items □ Pipeline front-end multi-stage solid particle pre-filter installed and filter cartridge pre-installed □ Temperature interlock sensor wired and calibrated, automatic power-off protection triggered accurately at 95℃ □ CIP program linked to mandatory 40 min slow cooling module, cannot be manually skipped □ All sharp metal support edges lined with soft plastic buffer pads, no coating friction contact risks □ Full surface coating visual re-scanning after installation, no new scratches or blisters □ Hydraulic tightness retest to check hidden substrate leakage under coating damaged areas □ Full-load trial run, medium long-term operating temperature stable below 90℃, no abnormal power surge ## Part 3 Non-Conformity Disposal Confirmation List □ Minor defects: Record rectification plan, re-inspection time and responsible person, sign off after retest qualified □ Major defects (material substitution, unqualified interlock, structural damage, coating penetration): Reject whole batch / disassemble and replace tube bundle completely □ Retest failure twice: Trigger third-party independent inspection, all testing costs borne by supplier □ Acceptance only signed after all items marked "Pass"; partial qualified single items cannot be accepted separately ## Part 4 Archive Filing Confirmation Items After Acceptance Pass □ Raw material certification, batch test reports □ Factory pre-delivery inspection photos and data records □ On-site installation acceptance test forms, trial run curve data □ Interlock linkage debugging records, hydraulic pressure test reports □ Complete operation, maintenance and fault troubleshooting manuals □ Spare parts delivery checklist, warranty commitment document □ All paper + electronic dual-version files bound into equipment full-life-cycle archives
