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

Common failures of mechanical seals mainly focus on leakage, abnormal wear, and functional failure, with clear causes and characteristics: 1. Leakage (most frequent failure) - Main manifestations: Continuous dripping or seepage at the seal face, or leakage from auxiliary seal rings (O-rings, V-rings). - Core causes: Seal face damage (scratches, cracks), improper spring pressure (too loose/tight), auxiliary seal aging (hardening, deformation), or shaft eccentricity. 2. Seal face wear/abrasion - Main manifestations: Rough, frosted, or grooved seal faces (moving/stationary rings), leading to reduced sealing performance. - Core causes: Solid particles in the medium (abrasive wear), insufficient lubrication (dry friction), or mismatched material hardness (e.g., soft graphite paired with unpolished hard materials). 3. Spring failure - Main manifestations: Spring deformation, breakage, or jamming (failure to provide stable axial pressure). - Core causes: Corrosion (from aggressive media), fatigue (long-term high-speed operation), or foreign matter blocking the spring cavity. 4. Auxiliary seal ring damage - Main manifestations: Sealing ring cracking, swelling, or losing elasticity. - Core causes: Incompatible with the medium (e.g., oil swelling rubber), excessive temperature (high temp hardens/softens seals), or improper installation (twisting during assembly). 5. Vibration/noise abnormal - Main manifestations: Abnormal noise (squeaking, grinding) or excessive vibration at the seal, accompanied by accelerated wear. - Core causes: Shaft misalignment, poor surface finish of the seal face, or loose fit between the moving ring and the shaft. 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

Mechanical seal replacement frequency depends on operating conditions, seal type, and application, with no fixed universal interval. General Replacement Guidelines 1. Based on Operating Hours - Under ideal conditions (stable parameters, clean/compatible fluids): 10,000–20,000 operating hours (roughly 1–2 years for continuous operation). - Under harsh conditions (high temp/pressure, abrasive/corrosive fluids, frequent start-stops): 1,000–5,000 operating hours (may need replacement every 3–6 months). 2. Based on Condition Monitoring - Replace immediately if failure signs appear (e.g., excessive leakage, abnormal noise, elevated temperature). - Proactively replace during scheduled equipment overhauls if seals show wear (e.g., scratched faces, degraded O-rings) even if no obvious failure. 3. Manufacturer’s Recommendations - Prioritize the seal manufacturer’s guidelines, as they specify intervals tailored to the seal’s design, materials, and intended use. 4. Preventive Replacement - For critical equipment (where unexpected failure causes heavy losses), replace seals before reaching their maximum service life—e.g., at 70–80% of the recommended operating hours. 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

Preventing mechanical seal failure centers on controlling operating conditions, ensuring proper installation, and conducting proactive maintenance. Core Prevention Measures 1. Stabilize Operating Conditions - Keep pressure, temperature, and rotational speed strictly within the seal’s design limits to avoid thermal deformation or excessive wear. - Prevent dry running: Ensure continuous, clean fluid supply for lubrication and cooling (install low-flow alarms if needed). - Minimize pressure surges or fluctuations with buffer systems (e.g., pressure regulators) to avoid seal face separation. 2. Ensure Fluid Cleanliness & Compatibility - Install high-efficiency filters (to remove particles ≤25μm) to prevent abrasive wear on seal faces. - Verify fluid compatibility with seal materials (e.g., avoid corrosive fluids with non-resistant elastomers like nitrile). - Maintain proper fluid viscosity; avoid overly thin or thick fluids that reduce lubrication. 3. Follow Proper Installation Procedures - Adhere to the manufacturer’s guidelines: Ensure correct alignment of the seal, shaft, and housing (misalignment causes uneven wear). - Use specified torque values for fasteners—over-tightening damages seal faces, while under-tightening leads to leaks. - Keep seal components clean and free of scratches during installation (even small defects on seal faces cause leaks). 4. Implement Proactive Maintenance - Conduct daily visual checks for leaks, abnormal noises, or temperature rises. - Perform scheduled inspections (per manufacturer recommendations or operating conditions) to replace worn parts (e.g., O-rings, springs) before failure. - Replace aging components proactively—elastomers degrade over time even without obvious damage. 5. Address Abnormalities Promptly - Shut down equipment immediately if dry running, severe vibration, or sudden temperature spikes occur. - Investigate and resolve root causes (e.g., clogged filters, fluid contamination) instead of temporary fixes. 6. Select the Right Seal - Choose a seal model matched to the application (e.g., high-temperature seals for hot fluids, corrosion-resistant seals for acidic media) to avoid mismatched performance.   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

The core signs of mechanical seal failure are visible leaks and abnormal equipment performance. Key Failure Signs 1. Leakage - Obvious dripping or streaming of fluid from the seal area (exceeds the normal acceptable rate, usually >5 droplets per minute). - Accumulation of fluid or stains around the seal and adjacent components. 2. Abnormal Sounds/Vibrations - Unusual grinding, squealing, or rattling noises from the seal region, indicating worn or misaligned seal faces. - Increased equipment vibration, often caused by seal damage leading to unstable operation. 3. Elevated Temperature - Higher-than-normal temperature at the seal housing, resulting from insufficient lubrication, dry running, or excessive friction between seal faces. 4. Reduced Equipment Efficiency - Drop in pump pressure, flow rate, or compressor output, as seal leakage affects system performance. - Increased energy consumption due to the seal’s increased resistance. 5. Visual Damage - Visible wear, scratches, or cracks on the seal faces when inspected after disassembly. - Deterioration (swelling, hardening, or tearing) of elastomeric components like O-rings or gaskets.   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