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

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