Jiaxing Burgmann Mechanical Seal Co., Ltd. Jiashan King Kong Branch

Proper maintenance of mechanical seals focuses on proactive monitoring, timely interventions, and adherence to operational limits—all to prevent premature wear, leakage, and unexpected failure. Below is a structured approach to maintain seal performance: 1. Implement Regular Operational Monitoring Consistent checks help detect early warning signs before they escalate into major issues. - Leakage Inspection: Check for visible leakage (drops or streams) around the seal. A tiny, intermittent film (≤5 drops/hour for non-hazardous fluids) is normal; excessive or continuous leakage indicates seal face damage or misalignment. - Temperature Monitoring: Use an infrared thermometer to measure the seal face temperature. For standard seals, temperatures exceeding 80°C often signal friction issues (e.g., dry running, misalignment) and require immediate inspection. - Vibration & Noise Checks: Unusual vibrations (felt via touch) or grinding noises suggest seal binding, worn components, or shaft misalignment. Compare readings to baseline levels (taken when the seal is new) for early anomaly detection. 2. Maintain Optimal Operating Conditions Avoid operating the seal outside its rated parameters, as this is a leading cause of accelerated wear. - Control Fluid Parameters: Ensure the sealed fluid’s temperature, pressure, and viscosity stay within the seal’s design limits. For example: - Use coolers/heaters to prevent overheating or freezing of the fluid. - Install filters to remove solids (particle size >50μm can scratch seal faces) from the fluid. - Prevent Dry Running: Never start the equipment if the seal chamber is empty. Dry running (no fluid lubrication between seal faces) causes instantaneous damage—always prime the system first. - Stabilize Shaft Speed: Avoid rapid speed fluctuations (e.g., sudden startups/shutdowns). Gradual acceleration/deceleration reduces stress on the seal’s springs and elastomers. 3. Perform Scheduled Preventive Maintenance Follow a routine maintenance plan based on the seal’s lifespan (typically 1–3 years, depending on usage) and manufacturer guidelines. - Periodic Disassembly & Inspection: Every 6–12 months (or as recommended), disassemble the seal to check: - Seal faces: Look for scratches, cracks, or uneven wear (replace if damaged). - Elastomers (O-rings, gaskets): Check for swelling, hardening, or tearing (replace annually, even if undamaged, as they degrade over time). - Springs & metal components: Ensure no corrosion, deformation, or breakage. - Clean & Lubricate: After inspection, clean all components with a compatible solvent (non-corrosive to seal materials). Lubricate elastomers and sliding parts with a fluid-compatible grease (e.g., silicone grease for PTFE O-rings) before reassembly. - Recheck Alignment: After reassembly, verify shaft coaxiality and seal face parallelism using a dial indicator—misalignment from disassembly can cause rapid wear. 4. Address Issues Promptly Delay in fixing minor problems leads to costly seal failure and equipment damage. - Immediate Action for Leakage: If leakage exceeds the acceptable limit, stop the equipment and inspect: - Loose gland bolts (retighten in a crisscross pattern with a torque wrench). - Damaged seal faces (replace if scratched or cracked). - Clogged fluid channels (clean to restore lubrication). - Replace Worn Components: Never reuse worn parts (e.g., scratched seal faces, hardened O-rings). Use manufacturer-approved replacement parts to ensure compatibility—generic parts often don’t match the seal’s design tolerances. 5. Document & Optimize Maintenance Record-keeping helps identify patterns and improve maintenance efficiency. - Maintain a Maintenance Log: Track inspection dates, findings, replacements, and operating parameters (temperature, pressure, RPM). This helps predict when components will fail and adjust maintenance schedules. - Analyze Failures: When a seal fails, investigate the root cause (e.g., chemical incompatibility, dry running) and update maintenance practices—for example, if seals fail due to solids in the fluid, install a finer filter.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Skype: kathysunlin Fax: 86-573-84072317 Mob: 86-15381220188 WhatsApp: 8615958372402 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

Selecting the correct mechanical seal hinges on matching its specifications to your application’s core parameters—including the fluid handled, operating conditions, and equipment design—to ensure long-term reliability and leakage prevention. Follow this 5-step framework to make an accurate selection: 1. Define the Fluid (Medium) Characteristics The fluid being sealed is the most critical factor, as it directly impacts material compatibility and seal design. - Chemical Compatibility: Confirm the seal’s materials (seal faces, elastomers, metal components) resist corrosion, swelling, or degradation by the fluid. For example: - Use PTFE elastomers for strong acids/alkalis. - Choose silicon carbide (SiC) seal faces for abrasive fluids (e.g., slurries) to avoid rapid wear. - Physical State: Differentiate between liquids, gases, or volatile fluids. Gases often require seals with tighter clearances or secondary sealing elements to prevent leakage. - Viscosity & Solids Content: High-viscosity fluids may need larger spring forces for face contact; fluids with solids (e.g., slurries) require robust, clog-resistant designs (e.g., unbalanced seals with wide gaps). 2. Match to Operating Conditions Seal performance is heavily influenced by temperature, pressure, and speed—ensure these align with the seal’s rated limits. - Temperature: Select seals rated for your fluid’s operating and startup/shutdown temperatures. For high-temperature applications (>200°C), use graphite-filled PTFE or metal bellows instead of standard elastomers. - Pressure: Choose between balanced (for high pressure, >10 bar) or unbalanced seals (for low pressure,

Avoiding installation mistakes is critical to preventing premature seal failure, leakage, and equipment damage. The key is to eliminate errors in preparation, precision alignment, and operational checks. Below are the 8 most common mistakes and how to avoid them: 1. Skipping Compatibility and Condition Checks - Mistake: Installing the seal without verifying if its model, size, and material match the equipment’s temperature, pressure, and medium. Also ignoring pre-installation inspections for seal defects (e.g., cracked faces, deformed O-rings) or shaft/chamber damage (e.g., scratches, burrs). - Avoidance: Always cross-check the seal’s specifications against the application requirements. Inspect all components (seal, shaft, chamber) for damage before installation. 2. Poor Cleanliness Leading to Contamination - Mistake: Allowing dirt, metal shavings, or residual media to remain on the seal faces, shaft, or seal chamber. Even tiny particles can scratch the sealing interface or cause binding. - Avoidance: Clean all parts with a lint-free cloth and compatible solvents (non-corrosive to seal materials). Ensure the installation area is dust-free. 3. Ignoring Coaxiality and Shaft Runout - Mistake: Failing to check the shaft’s runout (eccentricity) at the seal position. Excessive runout (beyond the seal’s limit, usually ≤0.1mm) causes uneven face wear and leakage. - Avoidance: Use a dial indicator to measure shaft runout. If it exceeds the limit, repair or replace the shaft before installing the seal. 4. Incorrect Seal Compression - Mistake: Over-compressing (causes excessive friction and heat) or under-compressing (fails to form a tight seal) the seal’s elastic components (O-rings, springs). This is often due to not following the manufacturer’s torque or gap guidelines. - Avoidance: Strictly adhere to the manufacturer’s instructions for compression. For cartridge seals, remove setting clips only after final tightening. 5. Uneven Gland Bolt Tightening - Mistake: Tightening gland bolts in a random order (not crisscross) or with uneven torque. This distorts the seal chamber, misaligns the seal faces, and breaks the sealing interface. - Avoidance: Use a torque wrench and tighten bolts in a crisscross pattern (e.g., 1-3-2-4 for 4 bolts) to apply uniform pressure. Follow the recommended torque value. 6. Tilting or Misaligning Seal Faces - Mistake: Installing component seals with the stationary and rotating faces tilted (not parallel) or misaligned. This destroys the thin lubricating film between the faces, leading to dry friction and rapid wear. - Avoidance: When assembling component seals, ensure faces are perfectly parallel. Use alignment tools if needed, and avoid forcing the seal into place. 7. Forgetting Post-Installation Manual Rotation - Mistake: Starting the equipment immediately after installation without manually rotating the shaft. Binding or tight spots (caused by misalignment or debris) can damage the seal once the machine runs. - Avoidance: Manually rotate the shaft 2-3 full turns after installation. It should feel smooth—if there’s resistance, disassemble and recheck. 8. Rushing Startup Without Leakage/Temperature Checks - Mistake: Starting the equipment at full speed right away and not monitoring initial performance. Immediate leakage or overheating (seal face temp >80°C for standard seals) can go unnoticed, leading to severe failure. - Avoidance: Start the machine at low speed first, then gradually increase to normal. Monitor for leakage (no visible drops) and face temperature. Stop immediately if issues arise.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Skype: kathysunlin Fax: 86-573-84072317 Mob: 86-15381220188 WhatsApp: 8615958372402 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

Ensuring correct mechanical seal installation relies on strictly following technical specifications, maintaining precision during assembly, and eliminating contamination or misalignment risks—these are the keys to avoiding premature seal failure. The installation process can be divided into 3 critical phases with actionable steps: 1. Pre-Installation Preparation: Lay the Foundation Thorough preparation prevents most installation errors before assembly even begins. - Verify Compatibility: Cross-check that the seal model, size, and material (seal faces, elastomers) fully match the equipment and工况 (temperature, pressure, medium) requirements. - Clean All Components: Use a lint-free cloth and compatible cleaning agents (avoid corrosive solvents) to clean the seal, shaft, seal chamber, and gland. Even tiny particles can scratch seal faces or cause misalignment. - Inspect for Damage: Check the seal for defects—such as cracks on seal faces, deformations in O-rings, or broken springs. Also, ensure the shaft surface is smooth (no scratches, burrs) and the seal chamber is free of wear. 2. Precision Assembly: Control Key Installation Parameters This phase requires attention to detail to ensure the seal is seated correctly and aligned. - Ensure Coaxiality: Use a dial indicator to measure the shaft’s runout (eccentricity) at the seal installation position. The error should not exceed the seal’s specified limit (typically ≤0.1mm) to avoid uneven face wear. - Set Proper Compression: Follow the manufacturer’s instructions to adjust the seal’s compression (for elastomers or springs). Over-compression causes excessive friction and heat; under-compression leads to leakage. For cartridge seals, ensure the setting clips are removed only after final tightening. - Align the Seal Faces: When installing component seals, ensure the stationary and rotating seal faces are perfectly parallel. Avoid tilting the seal during installation, as this will destroy the sealing interface. - Tighten Bolts Evenly: Use a torque wrench to tighten the gland bolts in a crisscross pattern (e.g., 1-3-2-4 for 4 bolts) to apply uniform pressure. Uneven tightening can distort the seal chamber and misalign the faces. 3. Post-Installation Verification: Confirm Installation Quality Final checks ensure the seal is ready for safe operation. - Manual Rotation Test: After installation, manually rotate the shaft 2-3 full turns. It should feel smooth with no tight spots or resistance—this indicates no binding between seal components. - Leakage and Temperature Check: Start the equipment at low speed first, then gradually increase to normal operating conditions. Monitor the seal for immediate leakage (no visible drops should form) and check the seal face temperature (it should stay within the manufacturer’s recommended range, usually ≤80°C for standard seals). - Record Installation Data: Document the seal model, installation date, torque values used, and initial test results. This helps track performance and troubleshoot issues later.     Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Skype: kathysunlin Fax: 86-573-84072317 Mob: 86-15381220188 WhatsApp: 8615958372402 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107