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

Mechanical seal flushing plans are standardized piping arrangements defined by API 682 to cool, lubricate, clean, and pressurize seal chambers, extending seal life and ensuring reliable operation. Below are the most common plans with concise English descriptions for technical documentation and catalogs.   Basic Internal Recirculation Plans   - Plan 01 Internal flow passages within the pump casing circulate process fluid to the seal chamber without external piping. Simple, low-cost, and suitable for clean, low-temperature services.   - Plan 11 Process fluid recirculates from the pump discharge through a flow-control orifice to the seal chamber. The most widely used plan for clean fluids, providing effective cooling and lubrication with minimal complexity .   - Plan 13 Fluid flows from the seal chamber back to the pump suction via a restricted orifice. Ideal for vertical pumps to prevent vapor locking and ensure continuous venting .   Cooled & Filtered Recirculation Plans   - Plan 21 Discharge fluid passes through a heat exchanger (cooler) and flow-control orifice before entering the seal chamber. Designed for high-temperature applications to lower seal chamber temperature .   - Plan 22 Combines Plan 21 with a Y-strainer to filter solids from the recirculating fluid. Suited for fluids with light particulate contamination .   - Plan 23 Closed-loop circulation with a dedicated heat exchanger; fluid is pumped from the seal chamber, cooled, and returned. Highly efficient for extreme-temperature services, minimizing process fluid usage .   External & Specialized Plans   - Plan 32 Clean, compatible fluid from an external source is injected directly into the seal chamber. Used for dirty, polymerizing, or high-solids fluids to isolate the seal from process contaminants .   - Plan 41 Recirculation with a cyclone separator to remove solids from the flush stream. Effective for fluids with moderate to high solid content .   Dual Seal Support Plans   - Plan 52 Unpressurized buffer fluid system for dual seals; circulates buffer fluid between inner and outer seals with a reservoir and heat exchanger. Used for toxic or hazardous fluids .   - Plan 53A/B/C Pressurized barrier fluid systems for dual seals, maintaining barrier fluid pressure above process pressure to prevent leakage. Available with bladder accumulators (53A), piston accumulators (53B), or external pumping (53C) .   - Plan 54 Pressurized barrier fluid supplied from an external source to dual seals. Suitable for critical, high-pressure, or corrosive applications requiring continuous clean fluid supply .   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 right materials for mechanical seals is critical to ensuring leak-tight performance, long service life, and reliable operation in industrial applications. The selection process must be guided by the operating environment, medium characteristics, and mechanical requirements—here’s a systematic breakdown of the key principles and practices: 1. Prioritize Compatibility with the Sealed Medium The sealed medium (liquid, gas, or slurry) is the primary determinant of material selection. Focus on three core properties: - Corrosiveness: Choose corrosion-resistant materials for aggressive media (e.g., acids, alkalis, solvents). Silicon Carbide (SiC) and Tungsten Carbide (WC) excel in corrosive environments, while elastomers like Fluororubber (FKM) or Perfluoroelastomer (FFKM) resist chemical degradation better than Nitrile Rubber (NBR). - Abrasiveness: For media containing solids (e.g., slurries, pigments), opt for hard, wear-resistant face materials. Tungsten Carbide (WC) with cobalt binder or reaction-bonded Silicon Carbide (RBSC) offers superior abrasion resistance; pair with a softer carbon graphite secondary face to minimize friction. - Temperature & Pressure: High-temperature (above 200°C) or high-pressure (above 10 bar) conditions demand materials with thermal stability and mechanical strength. Silicon Carbide (SiC) maintains hardness at extreme temperatures, while PTFE (Polytetrafluoroethylene) is ideal for low-friction, high-temperature elastomer applications. 2. Ensure Seal Face Pairing Compatibility Mechanical seal faces require a "hard-soft" pairing to balance wear resistance and sealing efficiency: - Common pairings: WC vs. Carbon Graphite, SiC vs. Carbon Graphite, or SiC vs. SiC (for ultra-high purity or non-abrasive media). - Avoid pairing two hard materials (e.g., WC vs. WC) as they cause excessive friction and premature failure; avoid two soft materials (e.g., Carbon Graphite vs. Carbon Graphite) for abrasive or high-pressure scenarios. 3. Align with Operating Conditions - Rotational Speed: High-speed applications (above 3000 RPM) need materials with low friction coefficients and high thermal conductivity. SiC and WC are preferred for their ability to dissipate heat, while PTFE-filled carbon graphite reduces friction. - Shaft Runout & Misalignment: For applications with moderate shaft runout, elastomers like EPDM (Ethylene Propylene Diene Monomer) offer flexibility, while rigid face materials (SiC, WC) suit precise alignment. - Environmental Constraints: Food, pharmaceutical, or drinking water applications require FDA-approved materials (e.g., PTFE, EPDM, or 316 stainless steel metal components) to ensure non-toxicity and compliance. 4. Reference Common Material Selection Guidelines Material Type Key Advantages Typical Applications Silicon Carbide (SiC) High hardness, corrosion/wear resistance Aggressive media, high-temp/pressure systems Tungsten Carbide (WC) Exceptional abrasion resistance Slurries, abrasive fluids, heavy-duty pumps Carbon Graphite Low friction, self-lubricating Low-abrasive media, low-to-medium speed pumps Fluororubber (FKM) Chemical resistance, high temp tolerance Oil, solvents, high-temperature applications PTFE Non-stick, chemical inertness Corrosive chemicals, food-grade applications By integrating medium compatibility, face pairing logic, and operating condition alignment, you can select mechanical seal materials that optimize performance, reduce maintenance costs, and prevent unplanned downtime.   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. Process: RBSC forms via reaction bonding with residual silicon; PLSSC sinters at high temp without external pressure. 2. Density & Porosity: RBSC is low-density with porosity; PLSSC is high-density, almost fully dense. 3. Performance: RBSC has good impact resistance; PLSSC excels in hardness, corrosion resistance and high-temperature stability. 4. Cost: RBSC is cost-effective; PLSSC is more expensive due to complex process.     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. Ensure the shaft surface finish meets requirements (Ra 0.2-0.4μm) and no scratches, burrs or corrosion exist before installation. 2. Clean all seal components (stationary ring, rotating ring, spring, O-ring) with clean solvent; avoid dust, impurities or oil residue. 3. Check the perpendicularity of seal chamber end face to shaft (tolerance ≤0.05mm) and coaxiality of shaft (runout ≤0.03mm) strictly. 4. Apply appropriate food-grade lubricant to O-rings and sliding surfaces for smooth assembly; do not use lubricant containing particles. 5. Install stationary ring and rotating ring carefully, avoid collision or deformation; ensure the sealing faces fit tightly without tilting. 6. Adjust spring compression amount accurately according to technical drawing; over-compression or under-compression will cause seal failure. 7. Keep the installation direction of spring consistent; ensure no jamming during shaft rotation. 8. After assembly, rotate the shaft manually for 3-5 circles to confirm flexible rotation without stuck or abnormal noise. 9. Vent the seal chamber completely before startup to avoid air locking; ensure full medium filling in the sealing system. 10. Run the equipment at low speed first for 10-15 minutes, check for leakage, temperature rise and abnormal vibration before normal operation. 11. Avoid dry running of mechanical seal; ensure sufficient lubrication and cooling during operation. 12. Do not hit the seal components with hard tools during installation to prevent damage to sealing faces.     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