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

A proper flushing and support system is essential for reliable operation and long service life of cartridge mechanical seals. The correct API Plan should be selected according to the process medium, pressure, temperature, viscosity, solids content, and sealing requirements. API Plan 11 – Process Recirculation Process fluid is taken from the pump discharge and circulated into the seal chamber. It provides basic cooling and lubrication. Typical applications: clean liquids, water, hydrocarbons, and general process fluids. API Plan 21 – Cooled Recirculation Similar to Plan 11, but a heat exchanger is installed in the flush line to reduce the temperature of the flushing fluid. Typical applications: hot liquids and applications requiring additional temperature control. API Plan 23 – Closed-Loop Cooling Seal chamber fluid is circulated through a cooler and returned to the seal chamber, normally with a pumping ring. Advantages: excellent temperature control and reduced thermal loading on the seal. API Plan 32 – External Flush A clean external fluid is injected directly into the seal chamber. It helps keep contaminants away from the seal faces. Typical applications: dirty liquids, slurries, crystallizing or polymerizing fluids. API Plan 52 – Unpressurized Dual Seal A buffer fluid reservoir is used with a dual mechanical seal. The buffer pressure is normally lower than the process pressure. Typical applications: hazardous or environmentally sensitive fluids where leakage monitoring is required. API Plan 53A/B/C – Pressurized Dual Seal A clean barrier fluid is maintained at a pressure higher than the process pressure. * 53A: gas-pressurized reservoir * 53B: bladder accumulator * 53C: piston accumulator These systems provide reliable lubrication, cooling, and process-fluid isolation. API Plan 54 – External Barrier Fluid System A dedicated external system continuously circulates clean, pressurized barrier fluid through the dual mechanical seal. Typical applications: high-pressure, high-temperature, hazardous, and critical services. API Plan 62 – External Quench A quench fluid such as nitrogen, steam, or water is supplied to the atmospheric side of the seal. Typical applications: crystallizing, coking, or solidifying fluids. Selection Guide The flushing plan should be selected according to actual operating conditions: Clean liquid → Plan 11 Hot liquid → Plan 21 / 23 Dirty or abrasive liquid → Plan 32 / 41 Hazardous liquid → Plan 52 / 53 High-pressure or critical service → Plan 53 / 54 Crystallizing or coking liquid → Plan 62   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. Check Operating Conditions Before Installation Before selecting and installing a mechanical seal, confirm the actual operating conditions of the reactor, including medium characteristics, temperature, pressure, vacuum level, rotation speed, and chemical compatibility. 2. Ensure Correct Seal Selection Select the appropriate mechanical seal type, materials, and design according to the process medium. Consider corrosion resistance, high-temperature performance, pressure conditions, and whether the medium contains particles or crystallizing substances. 3. Cleanliness During Installation Keep all seal components, especially sealing faces, clean during installation. Any dust, particles, oil contamination, or scratches on the seal faces may cause leakage or premature failure. 4. Check Shaft and Installation Accuracy Before installation, check the shaft condition, runout, alignment, and surface finish. Excessive shaft vibration or misalignment can reduce seal life and cause leakage. 5. Avoid Damage to Seal Faces The sealing faces are precision-machined components. Do not impact, scratch, or apply excessive force during assembly. Always handle seal faces carefully. 6. Lubrication and Cooling Requirements For high-temperature or vacuum reactor applications, ensure proper cooling, flushing, or barrier systems are available when required. Insufficient lubrication or cooling may result in overheating and seal face damage. 7. Start-Up Procedure Before starting the reactor, confirm that the sealing system is properly installed and that the cooling/flushing system is operating normally. Avoid dry running of the mechanical seal. 8. Control Operating Parameters Do not exceed the designed pressure, temperature, or speed limits of the mechanical seal. Sudden pressure changes, temperature shocks, or frequent start-stop operations may shorten seal service life. 9. Regular Inspection and Maintenance Regularly check for leakage, abnormal noise, vibration, and temperature increase. Replace worn sealing components promptly to prevent unexpected equipment downtime. 10. Proper Storage and Handling Store mechanical seals in a clean, dry environment away from moisture, chemicals, and direct sunlight. Keep sealing faces protected before installation. Important: A mechanical seal is a precision component. Correct selection, proper installation, and suitable operating conditions are essential to achieve reliable sealing performance and long service life.   1. Check Operating Conditions Before Installation Before selecting and installing a mechanical seal, confirm the actual operating conditions of the reactor, including medium characteristics, temperature, pressure, vacuum level, rotation speed, and chemical compatibility. 2. Ensure Correct Seal Selection Select the appropriate mechanical seal type, materials, and design according to the process medium. Consider corrosion resistance, high-temperature performance, pressure conditions, and whether the medium contains particles or crystallizing substances. 3. Cleanliness During Installation Keep all seal components, especially sealing faces, clean during installation. Any dust, particles, oil contamination, or scratches on the seal faces may cause leakage or premature failure. 4. Check Shaft and Installation Accuracy Before installation, check the shaft condition, runout, alignment, and surface finish. Excessive shaft vibration or misalignment can reduce seal life and cause leakage. 5. Avoid Damage to Seal Faces The sealing faces are precision-machined components. Do not impact, scratch, or apply excessive force during assembly. Always handle seal faces carefully. 6. Lubrication and Cooling Requirements For high-temperature or vacuum reactor applications, ensure proper cooling, flushing, or barrier systems are available when required. Insufficient lubrication or cooling may result in overheating and seal face damage. 7. Start-Up Procedure Before starting the reactor, confirm that the sealing system is properly installed and that the cooling/flushing system is operating normally. Avoid dry running of the mechanical seal. 8. Control Operating Parameters Do not exceed the designed pressure, temperature, or speed limits of the mechanical seal. Sudden pressure changes, temperature shocks, or frequent start-stop operations may shorten seal service life. 9. Regular Inspection and Maintenance Regularly check for leakage, abnormal noise, vibration, and temperature increase. Replace worn sealing components promptly to prevent unexpected equipment downtime. 10. Proper Storage and Handling Store mechanical seals in a clean, dry environment away from moisture, chemicals, and direct sunlight. Keep sealing faces protected before installation. Important: A mechanical seal is a precision component. Correct selection, proper installation, and suitable operating conditions are essential to achieve reliable sealing performance and long service life. 1. Check Operating Conditions Before Installation Before selecting and installing a mechanical seal, confirm the actual operating conditions of the reactor, including medium characteristics, temperature, pressure, vacuum level, rotation speed, and chemical compatibility. 2. Ensure Correct Seal Selection Select the appropriate mechanical seal type, materials, and design according to the process medium. Consider corrosion resistance, high-temperature performance, pressure conditions, and whether the medium contains particles or crystallizing substances. 3. Cleanliness During Installation Keep all seal components, especially sealing faces, clean during installation. Any dust, particles, oil contamination, or scratches on the seal faces may cause leakage or premature failure. 4. Check Shaft and Installation Accuracy Before installation, check the shaft condition, runout, alignment, and surface finish. Excessive shaft vibration or misalignment can reduce seal life and cause leakage. 5. Avoid Damage to Seal Faces The sealing faces are precision-machined components. Do not impact, scratch, or apply excessive force during assembly. Always handle seal faces carefully. 6. Lubrication and Cooling Requirements For high-temperature or vacuum reactor applications, ensure proper cooling, flushing, or barrier systems are available when required. Insufficient lubrication or cooling may result in overheating and seal face damage. 7. Start-Up Procedure Before starting the reactor, confirm that the sealing system is properly installed and that the cooling/flushing system is operating normally. Avoid dry running of the mechanical seal. 8. Control Operating Parameters Do not exceed the designed pressure, temperature, or speed limits of the mechanical seal. Sudden pressure changes, temperature shocks, or frequent start-stop operations may shorten seal service life. 9. Regular Inspection and Maintenance Regularly check for leakage, abnormal noise, vibration, and temperature increase. Replace worn sealing components promptly to prevent unexpected equipment downtime. 10. Proper Storage and Handling Store mechanical seals in a clean, dry environment away from moisture, chemicals, and direct sunlight. Keep sealing faces protected before installation. Important: A mechanical seal is a precision component. Correct selection, proper installation, and suitable operating conditions are essential to achieve reliable sealing performance and long service life.   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

o select a suitable mechanical seal, the following technical information should be provided. Accurate operating data helps ensure proper seal performance, reliability, and service life. ⸻ 1. Equipment Information 1.1 Equipment Type Please specify the equipment where the mechanical seal will be installed: * Centrifugal pump * Mixer / agitator * Reactor vessel * Compressor * Rotary equipment * Other special equipment Example: Equipment: Chemical centrifugal pump ⸻ 1.2 Manufacturer and Model Number Provide: * Equipment manufacturer * Pump / agitator model * Existing mechanical seal model (if available) Example: Pump Model: XYZ-100-50-200 Existing Seal: 59U / M7N ⸻ 1.3 Seal Installation Location Please indicate: * Pump side seal * Motor side seal * Agitator top entry seal * Bottom entry seal * Side entry seal ⸻ 2. Operating Conditions 2.1 Medium / Process Fluid Please provide: * Fluid name * Chemical composition * Concentration percentage * Presence of solids or particles Example: Medium: * Sulfuric acid 50% * Polyurethane resin * Diesel fuel containing FAME * Wastewater with particles ⸻ 2.2 Operating Temperature Provide: * Normal operating temperature * Maximum temperature * Minimum temperature Example: Operating temperature: 120°C Maximum temperature: 150°C ⸻ 2.3 Operating Pressure Provide: * Normal operating pressure * Maximum design pressure * Vacuum condition (if applicable) Example: Operating pressure: 8 bar Maximum pressure: 12 bar Vacuum: -0.8 bar ⸻ 2.4 Rotation Speed Provide shaft speed: * RPM (revolutions per minute) Example: Speed: 1450 RPM ⸻ 3. Mechanical Dimensions 3.1 Shaft Diameter The most important dimension: * Shaft diameter (d) * Sleeve diameter (if applicable) Example: Shaft diameter: 50 mm ⸻ 3.2 Seal Chamber Dimensions Provide: * Seal chamber diameter * Seal chamber depth * Installation length * Stuffing box dimensions ⸻ 3.3 Shaft Details Provide: * Shaft material * Shaft tolerance * Shaft runout * Surface finish ⸻ 4. Seal Design Requirements 4.1 Seal Type Please specify: Single Mechanical Seal Used for: * Clean fluids * Low leakage requirements Double Mechanical Seal Used for: * Toxic media * Flammable fluids * High-temperature applications * Vacuum applications ⸻ 4.2 Seal Arrangement Provide: * Internal seal * External seal * Back-to-back arrangement * Tandem arrangement ⸻ 4.3 Cartridge or Component Seal Please specify: * Cartridge mechanical seal * Component mechanical seal ⸻ 5. Material Selection 5.1 Seal Face Material Common combinations: Carbon / Silicon Carbide (C/SiC) Applications: * Water * General chemical service Silicon Carbide / Silicon Carbide (SiC/SiC) Applications: * Abrasive media * Corrosive chemicals * High temperature Tungsten Carbide / Carbon (WC/C) Applications: * High pressure * Heavy-duty applications ⸻ 5.2 Secondary Seal Material Provide elastomer requirement: * NBR * EPDM * FKM (Viton) * FFKM * PTFE Consider: * Chemical compatibility * Temperature resistance ⸻ 5.3 Metal Parts Material Common materials: * SS304 * SS316 * Hastelloy * Titanium ⸻ 6. Operating Environment Provide information about: 6.1 Installation Environment * Indoor / outdoor * Humidity * Dust * Corrosive atmosphere ⸻ 6.2 Special Requirements Examples: * Food grade requirement * FDA approval * ATEX requirement * API 682 compliance * Emission control requirement ⸻ 7. Flush and Support System Please provide: Single Seal: * Flush plan * Cooling requirement * External flushing Double Seal: * Barrier fluid type * Barrier pressure * Reservoir system * Circulation system ⸻ 8. Application History If replacing an existing seal, provide: * Previous seal model * Failure reason * Leakage problem * Operating hours * Photos of damaged seal ⸻ 9. Photos and Drawings Required Please provide: ✓ Equipment drawing ✓ Seal installation drawing ✓ Existing seal photo ✓ Shaft photo ✓ Seal chamber photo ✓ Nameplate photo ⸻ Mechanical Seal Selection Data Sheet (Customer Information) Equipment: Manufacturer: Model Number: Medium: Concentration: Temperature: Normal: ___ °C Maximum: ___ °C Pressure: Normal: ___ bar Maximum: ___ bar Vacuum: ___ bar Speed: ___ RPM Shaft Diameter: ___ mm Seal Type: □ Single Seal □ Double Seal □ Cartridge Seal Seal Face Material: O-ring Material: Metal Material: Flush System: Special Requirements: 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

A mechanical seal is designed to prevent fluid leakage between rotating equipment components, such as pumps, mixers, and reactors. However, leakage can occur due to many different reasons, including improper installation, incorrect seal selection, operating conditions, or equipment problems. Understanding the causes of mechanical seal leakage helps users improve equipment reliability and extend seal service life. 1. Dry Running of the Seal Faces One of the most common causes of mechanical seal failure is dry running. Mechanical seals rely on a thin lubricating film between the rotating face and stationary face. When the seal operates without sufficient liquid lubrication, the sealing faces generate excessive heat, causing: * Seal face damage * Cracking of carbon faces * Overheating * Rapid wear To avoid dry running, always ensure proper fluid circulation before starting the equipment. ⸻ 2. Improper Installation Incorrect installation is another major reason for seal leakage. Common installation problems include: * Damaged O-rings during assembly * Incorrect installation dimensions * Dirty sealing faces * Improper spring installation * Misalignment between shaft and seal The sealing faces must be clean, flat, and correctly aligned during installation. ⸻ 3. Wrong Mechanical Seal Selection A mechanical seal must be selected according to the actual operating conditions. Important factors include: * Temperature * Pressure * Rotational speed * Medium characteristics * Chemical compatibility For example, a standard carbon/ceramic seal may not be suitable for high-temperature chemical applications. In such cases, materials like silicon carbide, tungsten carbide, or special elastomers may be required. ⸻ 4. Excessive Vibration and Shaft Movement Equipment vibration can damage mechanical seals. Possible causes include: * Shaft misalignment * Bearing wear * Pump imbalance * Excessive shaft runout Continuous vibration can cause uneven wear of sealing faces and lead to leakage. ⸻ 5. Damaged or Incorrect Elastomers O-rings and rubber components provide secondary sealing. Leakage may occur when elastomers are: * Chemically attacked * Swollen or hardened * Cracked due to high temperature * Incorrectly selected Choosing the correct elastomer material, such as FKM, EPDM, or PTFE, is critical. ⸻ 6. Contaminated Sealing Medium Solid particles in the fluid can damage the sealing faces. Examples: * Sand * Metal particles * Crystallized materials * Slurry particles For abrasive media, special seal designs such as hard face combinations or double mechanical seals may be required. ⸻ 7. Incorrect Operating Conditions Mechanical seals may leak when actual operating conditions exceed design limits. Problems include: * Pressure exceeding seal rating * Temperature exceeding material limits * Running below minimum flow * Frequent start and stop cycles Always check that the seal operating conditions match the original design requirements   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