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

1. Pre-Work Safety Preparation * ☐ Confirm equipment is shut down and isolated (Lockout/Tagout applied) * ☐ Ensure zero pressure in pump and piping system * ☐ Drain and flush pump casing completely * ☐ Verify fluid is safe to handle (chemical/MSDS check) * ☐ Wear proper PPE (gloves, goggles, face shield, protective clothing) * ☐ Prepare clean working area to avoid contamination ⸻ 2. Pre-Disassembly Inspection * ☐ Record pump operating condition (temperature, pressure, leakage history) * ☐ Check seal leakage rate and location * ☐ Inspect coupling alignment condition (if accessible) * ☐ Mark relative positions of pump casing, gland, and shaft sleeve * ☐ Take photos before dismantling for reference ⸻ 3. Mechanical Seal Removal * ☐ Remove coupling guard * ☐ Disconnect coupling and check shaft movement * ☐ Remove pump cover / back pull-out assembly * ☐ Loosen gland plate bolts evenly in cross pattern * ☐ Carefully slide gland and seal assembly off shaft * ☐ Avoid scratching shaft sleeve or shaft surface * ☐ Remove stationary and rotating seal components separately * ☐ Keep seal faces clean and protected from impact * ☐ Inspect for abnormal wear pattern before cleaning ⸻ 4. Inspection After Removal * ☐ Check seal faces for cracks, heat marks, or scoring * ☐ Inspect elastomers (O-rings, gaskets) for swelling or hardening * ☐ Check shaft/sleeve for wear grooves or corrosion * ☐ Verify gland plate flatness and damage * ☐ Inspect bearing condition if axial/radial movement is suspected * ☐ Identify root cause of failure (dry running, misalignment, contamination, etc.) ⸻ 5. Preparation Before Installation * ☐ Clean all components with approved solvent * ☐ Ensure shaft/sleeve is smooth and burr-free * ☐ Replace worn sleeve or damaged components * ☐ Confirm correct seal type and material compatibility * ☐ Check installation dimensions against OEM drawing * ☐ Lightly lubricate O-rings (use compatible lubricant only) * ☐ Ensure seal faces are clean and not touched by hands ⸻ 6. Mechanical Seal Installation * ☐ Install stationary seat squarely into gland or housing * ☐ Ensure no tilt or misalignment during insertion * ☐ Install rotating seal unit onto shaft carefully * ☐ Avoid damaging elastomers during sliding * ☐ Position seal at correct installation length (per datasheet) * ☐ Tighten gland bolts evenly in cross pattern * ☐ Verify shaft rotation is smooth after assembly * ☐ Ensure correct spring compression / seal setting distance ⸻ 7. Reassembly of Pump * ☐ Reinstall pump casing and align components properly * ☐ Reconnect coupling and perform alignment check (laser/dial indicator) * ☐ Reinstall coupling guard * ☐ Confirm all bolts are torqued to specification * ☐ Reconnect flush / quench / barrier systems (if applicable) ⸻ 8. Pre-Start Checks * ☐ Verify pump is filled and fully primed * ☐ Confirm no dry running condition exists * ☐ Check seal support system pressure (if dual seal) * ☐ Ensure venting is complete * ☐ Rotate shaft manually to confirm no binding * ☐ Check instrument readings (pressure, temperature, flow) ⸻ 9. Start-Up Monitoring * ☐ Start pump and observe leakage level (initial slight leakage may occur) * ☐ Monitor vibration and noise * ☐ Check seal area temperature rise * ☐ Confirm stable operation within first 30–60 minutes * ☐ Inspect for abnormal leakage continuously * ☐ Record final operating parameters ⸻ 10. Post-Start Follow-Up * ☐ Re-check alignment after thermal stabilization * ☐ Verify seal chamber pressure stability * ☐ Confirm no abnormal wear signs after 24–48 hours * ☐ Log installation details for maintenance records   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. General Safety Requirements * Do not touch the seal faces with bare hands or any contaminated objects. * Always wear clean gloves during installation to avoid contamination. * Keep the installation area clean, dry, and free from dust and metal particles. * Ensure the seal model (M481), size, and materials are fully compatible with the working fluid. ⸻ 2. Pre-Installation Inspection * Check shaft or sleeve surface for scratches, corrosion, or wear. * Ensure shaft runout and alignment are within allowable limits. * Verify that the seal chamber and gland plate are clean and undamaged. * Confirm all seal components are complete and undistorted. ⸻ 3. Shaft and Equipment Requirements * Shaft surface must be smooth, clean, and properly chamfered. * Remove all burrs and sharp edges before installation. * Ensure proper concentricity between shaft and seal chamber. * Do not install the seal on a worn or undersized shaft surface. ⸻ 4. Handling of Seal Faces * Seal faces are precision-lapped components and must not be scratched. * Avoid dropping or impacting any seal parts. * Do not place seal faces directly on hard surfaces. ⸻ 5. Lubrication Requirements * Lightly lubricate O-rings with compatible lubricant before assembly. * Use clean water, glycol, or approved grease depending on elastomer material. * Do not use petroleum-based lubricants unless specified by manufacturer. ⸻ 6. Installation Precautions * Install stationary and rotating components in correct orientation. * Ensure correct spring compression according to installation dimension. * Tighten gland bolts evenly in a crisscross pattern to avoid distortion. * Do not over-tighten set screws or gland bolts. ⸻ 7. Alignment and Assembly Control * Maintain proper shaft alignment before final tightening. * Ensure uniform contact between seal faces after assembly. * Check that the rotating unit moves freely without binding. ⸻ 8. Pre-Start Checklist * Rotate shaft manually before starting the pump to ensure smooth operation. * Confirm that no dry-running condition exists. * Fill the seal chamber with process fluid and remove all air. * Verify that all installation tools, clips, and locking devices are removed. ⸻ 9. Operation Warning * Dry running is strictly prohibited even for a few seconds. * Monitor initial operation for leakage, vibration, and temperature rise. * Stop the pump immediately if abnormal noise or leakage occurs.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

Rubber bellows mechanical seals are a crucial type of shaft sealing component widely used in modern industrial fluid handling equipment. Combining the flexible deformation characteristics of rubber bellows and the sealing principle of mechanical seals, they effectively prevent medium leakage between rotating shafts and equipment housings, and have become an indispensable sealing solution in numerous industrial sectors. Different from traditional spring-loaded mechanical seals, rubber bellows serve as both the elastic compensation element and the secondary sealing part in this structure. The integrated design simplifies the overall structure, reduces the number of assembly parts, and lowers the failure rate caused by loose fittings or component aging. The rubber material features excellent elasticity, good compression resilience and outstanding adaptability to axial and radial displacement of the shaft. When the equipment runs with vibration, shaft deflection or slight axial movement, the rubber bellows can deform flexibly to keep the sealing face tightly fitted, maintaining stable sealing performance for a long time. In terms of medium adaptability, rubber bellows mechanical seals show great versatility. By selecting different rubber formulations such as nitrile rubber, fluororubber and EPDM, they can work stably in various media including water, oil, weak acid, weak alkali and common industrial chemical solutions. Nitrile rubber is widely used for water and mineral oil media due to its cost advantage and good oil resistance; EPDM excels in water, steam and weak corrosive aqueous environments with superior weather resistance and high-temperature resistance; fluororubber is applied to harsh working conditions involving strong corrosive media, high temperature and special chemical fluids, delivering reliable anti-corrosion and anti-aging performance. This kind of mechanical seal is primarily applied to rotating equipment such as centrifugal pumps, circulating pumps, agitators and mixers. In the water supply and drainage industry, it is used for municipal water pumps, sewage treatment pumps and circulating water pumps, effectively stopping water leakage and ensuring the normal operation of water system equipment. In the petrochemical industry, it is matched with various process pumps for conveying oil products and low-corrosion chemical media, adapting to continuous long-term operation under medium pressure and conventional temperature. In food, pharmaceutical and light industry fields, food-grade rubber bellows mechanical seals meet sanitary requirements, free from pollution to materials, and are commonly used in beverage delivery pumps, pharmaceutical fluid transfer equipment and food processing machinery. In HVAC and refrigeration systems, they are applied to cold water circulating pumps and refrigeration pumps, with stable performance under cyclic temperature changes. In practical operation, rubber bellows mechanical seals also present obvious advantages in installation and maintenance. The compact structure makes the installation process simpler and faster, suitable for equipment with limited installation space. Compared with metal bellows seals, rubber bellows produce lower friction noise during operation and have better shock absorption effect, which helps improve the overall operating environment of equipment. Meanwhile, reasonable material selection and standardized installation can greatly extend their service life. Regular inspection of the working status of the sealing face and bellows, timely replacement of aging components can avoid unexpected shutdown losses caused by seal failure. With the continuous development of industrial technology, industrial equipment puts forward higher requirements for sealing performance, environmental adaptability and service life. Manufacturers keep optimizing rubber formulas and structural designs of bellows, further improving the high-temperature resistance, low-temperature toughness and medium resistance of products. As a cost-effective and highly practical sealing product, rubber bellows mechanical seals will continue to be widely promoted and applied in more industrial fields, providing solid guarantee for the safe, stable and efficient operation of various fluid conveying and rotating equipment   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

Pre-installation Inspection  1. Check the dimensional tolerance of pump shaft, shaft sleeve and seal chamber; eliminate burrs, scratches and corrosion on mating surfaces. 2. Clean all seal components thoroughly with clean solvent, no sundries, dust or particle residue on sealing faces. 3. Verify model, specification and material of mechanical seal conform to design requirements. 4. Inspect static ring, rotating ring sealing faces for crack, chipping and damage. Mounting Requirements 1. Apply a thin layer of compatible lubricant on shaft surface before fitting the seal; avoid corrosive grease damaging elastomers. 2. Control the compression amount of spring precisely; excessive pre-compression leads to rapid wear of seal faces, insufficient compression causes leakage. 3. Keep coaxiality of shaft and seal cavity within specified tolerance to prevent eccentric abrasion during operation. 4. Install anti-rotation pin correctly to avoid static ring circumferential rotation. 5. Tighten gland bolts evenly in diagonal sequence to prevent gland deflection and seal face uneven stress. Post-installation & Commissioning 安装后试车注意 1. Turn pump rotor manually after assembly; the shaft shall rotate flexibly without jamming or abnormal friction resistance. 2. Complete auxiliary flushing/quench piping connection per API Plan standard before startup. 3. Fill medium into pump cavity to ensure sealing surfaces get liquid lubrication; prohibit dry running of mechanical seal. 4. Carry out no-load test run first, monitor sealing part for dripping or abnormal heating.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. General Safety & Pre-Installation Precautions • Strictly prohibit touching the lapped seal faces with bare hands or placing them directly on workbenches; use clean, lint-free cloths and non-particle solvents for cleaning. • Confirm the seal model (M481), size, and material compatibility with the process medium (e.g., EPDM rubber incompatible with mineral oils). • Ensure the installation environment is dust-free, dry, and temperature-controlled (15–35°C). • Wear nitrile gloves and safety glasses during assembly to avoid contamination and injury. 2. Shaft & Seal Chamber Preparation 2.1 Shaft/Sleeve Specifications • Shaft runout at the seal installation area: ≤0.1 mm (0.004 in). • Shaft bending: ≤0.05 mm (0.002 in). • Axial end play: ≤0.5 mm (0.020 in). • Shaft tolerance: h8; surface finish: Ra ≤1.6 μm. • Shaft/sleeve end: Chamfer 1×45° and polish to remove burrs. 2.2 Cleaning & Inspection • Clean the shaft, sleeve, seal chamber, and gland with a lint-free cloth and volatile solvent (e.g., isopropyl alcohol); remove all rust, scale, and debris. • Inspect for: ◦ Cracks, scratches, or corrosion on the shaft/sleeve. ◦ Distortion or damage to the seal chamber/gland. ◦ Proper alignment of the shaft and seal chamber (concentricity ≤0.05 mm). 3. M481 Seal Component Overview • Rotating Unit: Rotary face (carbon/silicon carbide), O-ring, spring, drive collar, set screws. • Stationary Unit: Stationary face (ceramic/silicon carbide), O-ring, gland, anti-rotation pin. • Hardware: Gland bolts, lock washers, setting clips (for transport protection). 4. Step-by-Step Assembly 4.1 Pre-Assembly of Stationary Unit 1. Insert the stationary face into the gland; align the anti-rotation pin with the gland slot to prevent rotation. 2. Lubricate the stationary face O-ring with compatible lubricant (water/glycol for EPDM; silicone grease for Viton). 3. Install the O-ring into the gland groove; ensure no twisting or pinching. 4. Place the gland assembly onto the clean workbench (stationary face up). 4.2 Pre-Assembly of Rotating Unit 1. Slide the spring onto the drive collar; ensure the spring is seated evenly and free of distortion. 2. Lubricate the rotary face O-ring with compatible lubricant; install into the rotary face groove. 3. Attach the rotary face to the drive collar; align the drive lugs and press firmly until seated. 4. Check spring free length: M481 standard free length = 12 mm; compression range = 1.5–2.0 mm (±0.2 mm tolerance). 4.3 Installation onto Shaft & Seal Chamber 1. Slide the stationary gland assembly over the shaft and into the seal chamber; hand-tighten the gland bolts diagonally (cross pattern) to avoid tilting. 2. Mark the shaft sleeve at the gland face (reference line 1). 3. Slide the rotating unit onto the shaft/sleeve; align the drive collar with the shaft key (if applicable). 4. Adjust the rotating unit position to achieve the correct spring compression: ◦ Measure the distance from reference line 1 to the rotating unit back face (setting dimension for M481: 10 ±0.2 mm). 5. Tighten the drive collar set screws (2×M4) to 3–4 N·m torque; secure with lock washers. 6. Finalize gland bolt torque: Tighten diagonally in 3 stages to 8–10 N·m (M8 bolts). 7. Critical: Remove all setting clips/transport locks from the seal faces after final torque. 4.4 Post-Assembly Checks 1. Manually rotate the shaft 2–3 full turns; rotation must be smooth, no binding, grinding, or tight spots. 2. Verify spring compression: Recheck the setting dimension; adjust if necessary. 3. Inspect seal faces: Confirm full contact, no gaps, scratches, or debris between faces. 5. Pre-Startup & Operation • Prime the pump: Fill the seal chamber with process liquid; never dry-run (even 3 seconds of dry running will damage the seal faces). • Remove all air from the seal chamber and piping. • Start the pump at low speed; gradually increase to rated speed. • Monitor during initial operation (5–10 minutes): ◦ Leakage: ≤1 drop per minute (normal for mechanical seals). ◦ Temperature: Seal chamber temperature ≤80°C. ◦ Vibration: No abnormal noise or vibration. 6. Maintenance & Troubleshooting 6.1 Routine Maintenance • Check leakage and temperature daily during operation. • Inspect seal faces and O-rings every 3 months (or 2,000 operating hours). • Replace O-rings every 6 months (or 4,000 operating hours) to prevent aging and leakage. 6.2 Common Issues & Solutions Problem Cause Solution Excessive leakage Incorrect spring compression; damaged O-ring; contaminated seal faces Adjust compression; replace O-ring; clean or replace seal faces High temperature Dry run; insufficient flush; misalignment Prime pump; increase flush flow; realign shaft/seal Short seal life Abrasive medium; poor lubrication; over-tightened bolts Install external flush (API Plan 32); use compatible lubricant; torque bolts correctly 7. Storage & Handling • Store M481 seals in a cool, dry place (temperature: 5–25°C; humidity: ≤60%). • Keep seals in original packaging until installation; avoid direct sunlight and dust. • Do not stack heavy objects on seal components to prevent distortion.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. Pre‑assembled Cartridge Design for Easy Installation & Reliability The M481 series is a factory‑preassembled and pre‑tested cartridge unit. This plug‑and‑play design eliminates on‑site assembly errors, reduces installation time and labor costs, and ensures consistent sealing performance right out of the box. It is delivered as a single integrated module, ready for direct mounting on agitators, reactors, and mixing vessels. 2. Bidirectional Rotation Independence Engineered with a non‑directional rotating mechanism (multiple rotating springs), the seal operates reliably regardless of shaft rotation direction (clockwise or counterclockwise). This flexibility simplifies equipment design and retrofitting, avoiding the need for custom seals for specific rotation directions. 3. Robust Sealing Performance Under Fluctuating Pressures A core advantage is its ability to remain tightly sealed during pressure variations or even pressure reversal. It supports both single‑seal operation with buffer fluid (up to 6 bar) and double‑seal operation with pressurized barrier fluid (max 12 bar), ensuring zero leakage in dynamic pressure environments. 4. Wide Operating Parameter Range • Pressure: Vacuum to 10 bar (single seal); up to 16 bar (double seal) • Temperature: -40°C to +200°C (‑40°F to +392°F), with high‑temperature variants for up to 350°C • Shaft Speed: Up to 3 m/s (16 ft/s), exceeding DIN standard limits for higher‑speed applications • Shaft Diameter: 40 mm to 220 mm, covering most standard agitator and reactor shaft sizes 5. Superior Material Versatility & Chemical Compatibility Customizable material combinations suit corrosive, abrasive, and high‑temperature media: • Seal Faces: Resin carbon, antimony‑impregnated carbon, silicon carbide (SiC), tungsten carbide (TC), alumina • Elastomers: FKM (Viton), FFKM (Kalrez), EPDM, NBR, AFLAS (resistant to acids, solvents, steam, and oils) • Metal Components: SS304, SS316, Duplex steel, Hastelloy C (for harsh chemical environments) • Metal‑free Product Side: Optional design for food, pharmaceutical, and ultra‑clean applications 6. DIN Standard Compliance for Easy Standardization & Retrofitting All mounting dimensions conform to DIN 28136 (vessels), DIN 28141 (flanges), and DIN 28154 (sleeves). This compliance enables seamless standardization across plants, easy replacement of old seals, and compatibility with carbon steel/stainless steel reactors without modifying equipment. 7. Optional Bearing Configuration for Enhanced Stability Available with or without an integrated bearing. The bearing‑equipped version reduces shaft runout and vibration in heavy‑duty agitators, extending seal life and improving operational stability in high‑load mixing applications. 8. Long Service Life & Reduced Maintenance Costs High‑precision manufacturing and wear‑resistant materials minimize friction and abrasion. The robust structure withstands thermal cycling, mechanical shocks, and continuous operation, reducing unplanned downtime and maintenance frequency. This lowers total ownership costs for industrial users. 9. Versatile Applications Across Industries Ideal for top‑entry agitators, reactors, and mixing vessels in: • Chemical & petrochemical (high‑pressure polymerization, corrosive media) • Pharmaceutical (sterile sealing, CIP/SIP compatibility) • Food & beverage (metal‑free options, FDA‑compliant materials) • Water & wastewater (abrasive media resistance) • Energy (thermal cycling, high‑temperature processes) 10. High Safety & Environmental Compliance Zero‑leakage performance prevents hazardous fluid emissions, meeting strict environmental regulations. The double‑seal design provides an extra safety barrier for toxic, flammable, or volatile media, protecting personnel and the environment.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. Sealing Structure • Mechanical seal: Face contact static & dynamic seal, precision end-face friction pair • Gland packing: Soft packing compression seal, contact shaft circumferentially 2. Leakage Performance • Mechanical seal: Extremely low leakage, nearly zero leakage • Gland packing: Obvious allowable leakage, cannot achieve zero leakage 3. Service Life • Mechanical seal: Long service life, low replacement frequency • Gland packing: Short service life, easy wear, frequent replacement 4. Friction & Power Consumption • Mechanical seal: Small friction resistance, low power loss • Gland packing: Large friction resistance, high energy consumption 5. Maintenance • Mechanical seal: Maintenance-free in service, simple replacement • Gland packing: Needs regular tightening and frequent maintenance 6. Application • Mechanical seal: Pumps, reactors, high speed / high pressure / corrosive working conditions • Gland packing: Low pressure, low speed, simple ordinary equipment   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

1. Reliable Sealing: Extremely low leakage (≈1% of soft packing seals); stable performance during long-term operation. 2. Long Service Life: 1–2 years in oil/water media, ≥6 months in chemical media. 3. Low Friction Loss: Friction power consumption is only 10%–50% of soft packing seals. 4. Minimal Shaft Wear: Shaft/sleeve remains almost unworn. 5. Long Maintenance Intervals: Automatic wear compensation; no frequent maintenance needed. 6. Good Vibration Resistance: Insensitive to shaft vibration, runout, or seal cavity misalignment. 7. Wide Application Range: Suitable for high/low temperature, high pressure, vacuum, and corrosive/abrasive media. 8. Adaptability to Twin-Screw Pumps: Matches screw pump characteristics (stable flow, low pulsation); compatible with non-lubricating/viscous media. Precautions for Use Installation 1. Alignment & Concentricity: ◦ Tighten gland bolts evenly after coupling alignment; face runout ≤0.05 mm. ◦ Gland-to-shaft/sleeve clearance uniform; concentricity tolerance ≤0.01 mm. 2. Spring Compression: Compress per specifications (error ≤2 mm); excessive compression accelerates wear, insufficient causes leakage. 3. Dynamic Ring Flexibility: Ensure free axial movement; must rebound automatically when pressed. 4. Cleanliness: Keep sealing elements and cavity free of debris; lubricate with compatible fluid during assembly.   Jiaxing Burgmann Mechanical Seal Co., Ltd Email: doris@mechanicalseal.com.cn Skype: kathysunlin Fax: 86-573-84072317 Mob: 86-15381220188 WhatsApp: 8615381220188 Website: www.industrial-mechanicalseals.com Add: A-5 Wanyangzhongchuangcheng, Ganyao Town, Jiashan county, Jiaxing, Zhejiang, China. 314107

1. Reasonable Selection of Mechanical Seal Type & Material Proper model and material selection is the fundamental premise to extend mechanical seal service life. • Select seal structure according to working conditions: medium temperature, pressure, rotating speed, viscosity and corrosiveness. • Match friction pair materials reasonably: such as silicon carbide, tungsten carbide, carbon graphite, ceramic; avoid unreasonable hard-to-hard or soft-to-soft pairing. • Choose suitable auxiliary sealing materials (O-ring, gasket): EPDM, Viton, PTFE, HNBR etc., adapt to medium corrosion, temperature resistance and aging resistance requirements. • For high temperature, high pressure, easy crystallization and particle-containing media, adopt balanced mechanical seals or tandem seal arrangement. 2. Strictly Control Installation Accuracy & Standard Operation Improper installation is the main cause of early failure of mechanical seals. • Ensure the shaft or sleeve runout, axial displacement and radial clearance comply with technical standards. • Keep the seal chamber clean without impurities, burrs and welding slag before installation. • Use special assembly tools; avoid knocking, scratching the seal face and elastic components. • Control compression amount of the spring properly: too large compression leads to rapid wear and heat; too small causes leakage. • Install static and dynamic rings in place; ensure sealing face fits closely without deflection. 3. Optimize Operating Working Conditions Avoid overload and abnormal operation to reduce seal wear and thermal damage. • Prohibit long-time dry running: mechanical seals must work with liquid film lubrication; dry friction will burn the seal face quickly. • Control medium temperature: avoid overheating causing material aging, seal face thermal deformation and liquid film vaporization. • Stabilize working pressure: prevent sudden pressure surge, vacuum negative pressure and frequent start-stop impact. • Limit allowable linear speed: select high-speed type seal for high rotating speed equipment to avoid excessive friction heat. 4. Effective Flushing, Cooling & Lubrication System Adopt auxiliary pipeline systems to improve seal operating environment. • Set up seal flushing (Plan 11 / Plan 21 / Plan 23 / Plan 52 / Plan 53 etc.) to take away friction heat and prevent local overheating. • Apply cooling and heat preservation for high-temperature and low-temperature working conditions to avoid material cold brittleness or high-temperature aging. • For media with solid particles, install filter or adopt back flushing to prevent particles from entering the seal face and causing abrasive wear. • Maintain stable liquid film between seal end faces to ensure lubrication and cooling effect. 5. Medium Treatment & Impurity Control Solid particles, crystallization and dirt in the medium will seriously shorten seal life. • Install filters, magnetic separators to reduce solid particles and impurities in the medium. • For easy crystallization and viscous media, take heat tracing and dilution measures to prevent crystallization deposition on seal parts. • Control medium pH value and corrosivity; select anti-corrosion materials matching the medium property. 6. Daily Maintenance, Inspection & Periodic Overhaul Standard daily management can timely eliminate hidden troubles and delay seal failure. • Regularly check leakage amount, equipment vibration, noise, temperature and pipeline flushing condition. • Avoid equipment abnormal vibration, shaft misalignment and base loosening which will aggravate seal wear. • Replace aging elastic elements (O-rings, springs) regularly even without obvious leakage. • Do frequent inspection after equipment startup and load change; handle slight leakage in time to avoid deterioration. 7. Avoid Frequent Start-Stop & Abnormal Working Conditions • Frequent start-stop will cause repeated separation and contact of seal faces, damaging the liquid lubrication film and accelerating wear. • Avoid idle running, low-load long-time operation and medium cut-off operation. • Carry out soft start and slow down shutdown to reduce mechanical impact on seals.   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

1. Safety & Pre-Installation Preparation 1.1 Safety Precautions • Lockout/Tagout: Confirm the reactor/agitator is disconnected from power, fully depressurized, and all internal media is drained and cleaned. • PPE: Wear chemical-resistant gloves, safety goggles, and clean work clothes to prevent contamination and injury. • Environment: Maintain a clean, dry, dust-free workspace. Prevent any particles from entering seal faces. 1.2 Component & Dimension Inspection • Verify Model: Ensure seal type, size, and material match equipment specifications (shaft diameter, seal chamber dimensions, pressure/temperature ratings). • Check Parts: Inspect rotating ring, stationary ring, springs, O-rings, shaft sleeve, gland, and fasteners. Reject any parts with cracks, chips, scratches, deformation, or corrosion. • Shaft & Chamber Tolerances: ◦ Shaft OD tolerance: ±0.05 mm (±0.002 in) ◦ Shaft radial runout: ≤ 0.1 mm T.I.R. ◦ Shaft axial end float: ≤ 0.13 mm (0.005 in) ◦ Seal chamber face squareness to shaft: ≤ 0.0005 in/in (0.5 μm/mm) ◦ Shaft surface roughness: ≤ 1.6 μm; shaft tolerance: h8 ◦ Shaft sleeve end must have a 3×20° smooth chamfer 1.3 Thorough Cleaning • Clean shaft, sleeve, seal chamber, flange faces, and gland with alcohol or acetone; remove all oil, grease, and debris. • Wipe seal faces (rotating/stationary rings) with a lint-free soft cloth; never touch or scratch lapped faces. • Clean all tools; avoid contamination. 1.4 Lubrication • Apply a thin, compatible lubricant (food-grade silicone grease, clean machine oil, or manufacturer-recommended lubricant) to: ◦ Shaft/sleeve surface ◦ O-rings and secondary seals ◦ Mating faces of rotating and stationary rings • Note: For EPDM, butyl, or FKM O-rings, avoid incompatible mineral oils. 2. Installation Procedure (Standard Single-Ended Seal) 2.1 Install Stationary Ring Assembly 1. Fit the stationary ring’s secondary seal (O-ring) onto the back of the stationary ring. 2. Insert the stationary ring into the seal chamber/gland. Align anti-rotation pins with anti-rotation slots (no hard contact). 3. Ensure the stationary ring face is perpendicular to the shaft centerline. 4. Install the gland onto the reactor flange. Tighten bolts crosswise and evenly in 2–3 stages to specified torque; avoid distortion. 2.2 Install Rotating Ring Assembly 1. Slide the shaft sleeve (if used) onto the shaft; align keyway and secure with set screws to manufacturer torque. 2. Assemble rotating ring, spring(s), and drive seat on the sleeve/shaft. 3. Use a guide sleeve to protect seal faces; slide assembly into position. Do not strike or force. 4. Verify springs are uniformly compressed, free of binding, and provide even pressure. 5. Tighten drive set screws evenly and crosswise to lock the assembly to the shaft. 2.3 Final Alignment & Check 1. Manual Rotation: Spin the shaft by hand. It must rotate smoothly, no binding, noise, or excessive friction. 2. Runout Check: Use a dial indicator to measure rotating ring face runout. Max allowed: ≤ 0.05 mm T.I.R. 3. Spring Function: Push the rotating ring axially; it should bounce back freely without sticking. 4. Remove any setting clips, lock pins, or transport locks before operation. 2.4 Cartridge Seal Installation (if applicable) 1. Align cartridge seal with shaft and chamber; ensure flange bolt holes match. 2. Slide cartridge into place; use centering guides if provided. 3. Hand-tighten flange bolts; align and check runout (≤ 0.05 mm). 4. Torque bolts to specs in a crosswise pattern. 5. Remove setting clips before startup. 3. Auxiliary System Connection (Double Seal / API Plans) • For dual seals (Plan 52, 53, 54), connect flush, cooling, or barrier fluid lines. • Ensure barrier fluid pressure is 0.05–0.1 MPa higher than kettle pressure per design. • Check for leaks in piping; purge air from circuits. 4. Post-Installation Testing 1. Static Pressure Test: Pressurize to 1.25× design pressure; hold 10–30 minutes. No visible leakage. 2. Dry Run (Optional): Run idle for 15–30 minutes to check heat, noise, and seal performance. 3. Check for abnormal heat, vibration, or leakage during initial operation. 5. Critical Installation Rules • Never use hard tools to strike seal components. • Never touch or contaminate lapped seal faces. • Even torque only — avoid over-tightening or uneven bolting. • Maintain cleanliness at all stages. • Follow manufacturer-specific dimensions (spring compression ±0.2 mm).   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

I. Core Advantages (Compared with Conventional Spring Seals) 1. Excellent Adaptability to High & Low Temperatures • No vulnerable components prone to failure under extreme temperatures • Stable performance in high-temperature, low-temperature and fluctuating temperature conditions 2. Superior Axial Flexibility & Compensation Ability • Metal bellows act as both elastic element and secondary seal • Effectively compensates for shaft runout, axial movement and installation misalignment 3. No Clogging & Long Service Life • No small springs that may get stuck by particles, crystals or viscous media • Reduces frequent maintenance and replacement 4. Strong Corrosion Resistance • Made of high-grade alloys (Hastelloy, Inconel, stainless steel, etc.) • Suitable for corrosive, toxic and hazardous media 5. Zero Leakage & High Reliability • Integral welded structure minimizes leakage points • Ideal for flammable, explosive and environmentally sensitive fluids 6. Wide Pressure & Speed Range • Performs well in high-pressure and high-speed working conditions • Maintains stable sealing under variable working loads II. Operating Instructions 1. Installation Requirements • Keep sealing surfaces clean and scratch-free • Ensure concentricity of shaft and sealing cavity • Tighten fasteners evenly to avoid distortion 2. Media Compatibility • Select appropriate bellows material according to medium properties, temperature and concentration • Not recommended for media causing severe erosion or rapid crystallization 3. Start-Up & Operation • Run-in at low speed and pressure before full operation • Avoid dry running, which may cause overheating and damage • Maintain stable lubrication and cooling conditions 4. Maintenance & Inspection • Regularly check for leaks, abnormal noise or vibration • Inspect bellows for cracks, deformation or fatigue damage • Replace worn sealing faces and gaskets in a timely manner 5. Storage Conditions • Store in dry, dust-free environment away from direct sunlight • Prevent collision or compression that may deform the bellows   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 seals are critical components in rotating machinery such as pumps, compressors, and mixers, responsible for preventing fluid leakage between rotating and stationary parts. Their service life directly affects the operational stability, maintenance cost, and production efficiency of the entire equipment system. The following detailed technical measures are formulated to effectively prolong the service life of mechanical seals from the perspectives of model selection, installation and commissioning, operational control, daily maintenance, and working condition optimization. 1. Scientific and Reasonable Model Selection and Material Matching Model selection is the primary prerequisite for ensuring the long-term stable operation of mechanical seals. It is essential to conduct comprehensive matching based on actual operating parameters and medium characteristics. • Match with operating parameters: Accurately calculate and confirm the operating pressure, temperature, rotating speed, and shaft diameter of the equipment. Select mechanical seals suitable for high-pressure, high-temperature, low-temperature, or high-speed working conditions to avoid overload operation caused by improper model selection. • Select sealing materials according to medium characteristics: For corrosive media, choose corrosion-resistant sealing end faces and auxiliary sealing materials, such as silicon carbide, tungsten carbide for end faces, and perfluoroelastomer for auxiliary seals. For abrasive media, give priority to wear-resistant and scouring-resistant material combinations to resist particle erosion. • Consider application scenarios: Select appropriate structural forms such as single-end face, double-end face, or cartridge mechanical seals for special working conditions like high dust, easy crystallization, and toxic media, to enhance the adaptability of the seal. 2. Standardized Installation and Commissioning Operations Non-standard installation is one of the main causes of premature failure of mechanical seals. Strictly follow the technical specifications for installation and commissioning. • Pre-installation inspection: Check the dimensional accuracy, surface roughness, and wear degree of the shaft, shaft sleeve, sealing cavity, and mating parts; ensure no burrs, scratches, or deformation. Clean all parts thoroughly to remove iron filings, dust, and impurities. • Control installation accuracy: Ensure the radial runout of the shaft meets the standard, avoid excessive shaft eccentricity and axial movement; strictly control the compression amount of the mechanical seal spring to prevent over-compression leading to excessive end face wear or under-compression causing leakage. • Ensure concentricity and parallelism: Guarantee the high concentricity between the rotating and stationary parts of the seal, and the high parallelism of the sealing end faces to avoid uneven stress and partial wear. • Pre-lubrication treatment: Apply a thin layer of clean lubricating grease or compatible medium on the sealing end faces and auxiliary seals before installation to avoid dry friction damage during initial startup. 3. Optimize Operating Conditions and Avoid Abnormal Operation Stable operating conditions can greatly reduce the wear and damage of mechanical seals, and avoid various abnormal working states. • Prevent dry friction: Ensure sufficient lubrication and flushing of the sealing end faces at all times. Configure a special flushing pipeline for equipment prone to insufficient lubrication, and control the flow and pressure of the flushing liquid to take away friction heat and block impurities. • Stabilize operating parameters: Avoid frequent fluctuations in operating pressure, temperature, and speed; prevent sudden load changes, frequent startup and shutdown, and idle running, which will cause thermal shock and mechanical impact on the sealing end faces. • Block impurity intrusion: Install filters, strainers, and other devices at the equipment inlet to prevent solid particles, sediment, and other impurities from entering the sealing cavity, so as to avoid scratching and abrasion of the sealing end faces. • Control medium crystallization and scaling: For media prone to crystallization and scaling, adopt appropriate flushing, cooling, or heat preservation measures to prevent crystal particles from adhering to the sealing end faces and causing seal failure. 4. Regular Daily Maintenance and Timely Fault Handling Implement standardized maintenance management to detect and deal with potential faults of mechanical seals in advance. • Regular inspection: Regularly check the sealing part for leakage, abnormal noise, vibration, and overheating during equipment operation; monitor the temperature of the sealing cavity and the state of the flushing system in real time. • Periodic maintenance: Formulate a periodic maintenance plan according to the operating cycle and working conditions, replace worn sealing end faces, damaged auxiliary seals, and failed springs in a timely manner; check and adjust the compression state of the elastic elements. • Timely handling of abnormal faults: Once slight leakage, abnormal temperature rise, and other problems are found, stop the machine for inspection immediately instead of continuing operation with faults, so as to prevent minor faults from expanding and causing complete damage to the mechanical seal. 5. Reasonable Storage and Spare Part Management For spare mechanical seals, scientific storage is also crucial to avoid performance degradation before installation. • Control storage environment: Store in a dry, cool, and dust-free environment, avoid direct sunlight, high temperature, and heavy pressure, to prevent aging, deformation, and rusting of auxiliary seals and elastic parts. • Protect sealing end faces: Cover the sealing end faces with protective covers to avoid collision and scratch damage; do not disassemble the original packaging at will before installation. • Rotate spare parts usage: Follow the principle of first-in first-out for spare parts to avoid long-term idle storage leading to performance failure of sealing components.   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