# Fermentation Heating Tube Anti-Corrosion Vibration, Wear & Mechanical Abrasion Corrosion Prevention Specification ## Preface This specification (Doc.167) is a mechanical protection supplementary technical document of the whole anti-corrosion management system from Doc.15 to Doc.166. It standardizes vibration source control, pipeline support optimization, anti-wear protection arrangement, regular wear inspection and abrasion damage rectification for fermentation heating tube pipelines, valves, connecting fittings and instrument pipelines. Long-term equipment operation will cause pump vibration, fluid flow-induced pipeline resonance, relative friction between pipelines and supports, collision between adjacent pipelines, leading to passive film scratch damage, local thinning, fretting corrosion and stress concentration. Once the metal surface protective layer is destroyed, pitting corrosion and pipeline leakage will rapidly occur at the worn positions. This specification eliminates mechanical-induced corrosion sources from design fixing, operation monitoring and regular maintenance, and avoids premature equipment failure caused by abrasion and vibration. ## 1. Identification of Vibration & Wear Risk Positions and Risk Grading Key high-risk locations include pipeline inlet and outlet connected to circulating pumps, long straight pipeline sections prone to fluid resonance, pipeline bend sections, support contact points, pipelines crossing steel structures, densely arranged parallel pipelines, thin-wall instrument connecting pipes and frequently opened/closed valve connectors. According to vibration amplitude, operating frequency and contact extrusion degree, risks are divided into three grades: slight wear early warning, medium vibration risk and severe resonance high risk. All high-risk positions shall be uniquely marked in accordance with on-site visual management requirements, and included in the key patrol and periodic wall thickness inspection ledger. ## 2. Pipeline Support Reinforcement and Anti-Wear Protective Layout For newly installed or overhauled heating pipelines, the spacing of fixed supports and sliding supports shall comply with pressure pipeline design specifications to restrain pipeline resonance caused by fluid impact. Hard contact between metal pipelines and support frames must be isolated via high-temperature resistant, wear-resistant non-metallic buffer gaskets to avoid direct friction and fretting corrosion. Loose pipelines with obvious shaking shall be reinforced with additional limit supports and anti-vibration clamps. Adjacent pipelines shall reserve sufficient safety clearance; where spacing is insufficient, anti-collision and anti-wear protective sleeves shall be installed to eliminate mutual collision abrasion during equipment startup and shutdown. ## 3. Vibration Source Equipment Regular Maintenance & Dynamic Monitoring Circulating water pumps, compressors and other vibration-generating equipment shall be inspected quarterly for base bolt tightness, shock pad aging, rotor dynamic balance and bearing wear. Timely replace aging shock absorption components and fasten loose anchor bolts to reduce overall vibration transmission to the pipeline system. Operators conduct vibration amplitude sensory inspection during each shift patrol; for pipelines with continuous obvious vibration, portable vibration detection instruments shall be used for quantitative testing. Once exceeding the preset amplitude threshold, equipment shall be scheduled for maintenance to eliminate resonance risk. Frequent startup and sudden load adjustment shall be avoided to prevent instantaneous impact vibration from scratching the pipeline passive film. ## 4. Wear Damage Inspection, Local Repair and Anti-Corrosion Recovery During regular ultrasonic wall thickness measurement, wear contact positions shall be tested with increased sampling density to check for local thinning caused by long-term friction. Minor surface abrasion without wall thickness reduction shall be polished and supplemented with anti-corrosion coating; positions with passive film scratch shall implement local passivation treatment again to restore the protective layer. If local wall thinning reaches the early warning limit, the worn pipeline section shall be cut and replaced. After maintenance and welding repair, anti-vibration and anti-wear protection measures must be optimized synchronously to prevent repeated abrasion at the same position. All wear repair records shall be archived into the equipment full-life file for follow-up enhanced tracking inspection. ## 5. Operational Standard Optimization and Preventive Experience Promotion Optimize the equipment startup procedure to adopt gradual pressure boosting and flow regulation, avoid instantaneous high-flow impact triggering pipeline violent vibration. Regularly count the distribution law of pipeline wear failure positions, summarize common causes such as unreasonable support layout, aging shock absorption parts and improper operation, and optimize the design scheme of pipeline support system during centralized shutdown overhaul. Typical fretting corrosion and vibration-induced thinning cases are incorporated into the anti-corrosion knowledge base, so that maintenance personnel can master the identification and preventive control methods of mechanical abrasion risks. ## 6. System Value This specification fills the control gap of mechanical-induced corrosion in the anti-corrosion management system, cuts off the damage path of pipeline passive film caused by vibration, friction and collision, fundamentally reduces the failure probability of fretting corrosion and local abrasion thinning, forms a protection system integrating structural fixing, vibration damping and wear isolation, and further improve
s the full-mechanism multi-factor closed-loop anti-corrosion management system of fermentation heating tubes.
