Shenyang water pump boiler feed water pump mechanical seal practical technical guide

Shenyang water pump boiler feed water pump mechanical seal practical technical guide

1. Key points of seal selection

 

Dielectric characteristic matching

1. Clean water working conditions: Single-end container seal (standard configuration of Shenyang water pump) is selected.
2. Containing particulate media: Equipped with Shenyang water pump S-type cyclone separator + cemented carbide sealing ring.
3. High temperature operating conditions (> 120 ℃): Forced use of double face seal + external cooling system.

Parameter adaptation rules

1. Pressure ≤ 4.0 MPa: balanced seal.
2. Pressure 4.0-8.0 MPa: Unbalanced type seal (30% increase in leakage allowed).
3. Speed > 3000rpm: Shenyang water pump anti-flutter spring assembly is required.

Economic recommendations

1. Continuous running equipment: Inlet sealing (e.g. Bergmann) is recommended.
2. Intermittent operation equipment: Shenyang water pump's self-developed seal is more cost-effective.

2. Installation precautions

 

Frequently asked questions handling

1. Static sealing surface deformation (accounting for 42%): Contact Shenyang Water Pump to provide flatness testing service.
2. Spring failure (accounting for 35%): the elastic element is forced to be replaced every 2 years.
3. Auxiliary system failure (accounting for 23%): Focus on monitoring cooling water flow and filter pressure difference.

Installation specifications

1. The radial runout of the shaft should be \u003C 0.05 mm (Shenyang Water Pump provides on-site correction service).
2. The deviation of seal compression amount is controlled within ± 0. 3mm.
3. Auxiliary lines must use original transition joints (to prevent electrochemical corrosion).

3. Operation and maintenance management plan

 

Daily Monitoring

1. 1. The amount of leakage was recorded weekly (normal value: 3-5 drops/min).
   2. Check the oil quality of bearing housing every month (water content ≤ 0. 1%).
   3. Clean the cooler quarterly (maintain the temperature difference \u003C 15 ℃).

Fault emergency treatment

1. Sudden leakage: Immediately switch the backup pump, close the faulty pump valve, and contact Shenyang Water Pump for 24-hour technical support.
2. Overheating of the sealed chamber: Check the cooling water system and use the Shenyang water pump remote diagnosis program for analysis.
3. Leakage fluctuation: To check the pressure stability of the system, a pressure compensation device can be installed.

Spare parts management

1. Regular seal stocking period: 6 months usage.
2. Key components (such as silicon carbide ring) must be purchased from original Shenyang water pump parts.
3. The seal spring is recommended for 3-year preventive replacement.

4. Transformation cases and cost comparison

 

Example of Reconstruction of Tieling Thermal Power Plant

1. Equipment: DG270-140 feed pump
2. Original seal life: 8-10 months
3. Retrofit program: the use of Shenyang pump improved seal (increase the flushing hole)
4. Retrofit effectiveness: life extension to 18 months, a single set of annual savings of 28,000 yuan

Comparison of maintenance costs

1. Imported seals: purchase cost of 12-15 million, annual maintenance of 32,000, response 48 hours
2. Shenyang seals: purchase cost of 5-8 million, annual maintenance of 18,000, response 12 hours five technology development direction Ceramic seal mass production technology (cost reduction of 40%) Intelligent leakage monitoring system (reduce 30% of spare parts type) Standardized seal components (reduce 30% spare parts type) 18,000, response 12 hours

V. Technology Development Direction

 

1. Ceramic seal mass production technology (cost reduction of 40%)
2. Intelligent leakage monitoring system (in line with API 682C class standard)
3. Standardized seal components (reduce 30% spare parts model)

Shenyang pumps selected seal components have been applied in 600+ power plants in China, with an average service life of 28,000 hours. Users are recommended to select the model according to the actual operation data and develop maintenance strategy in combination with the working conditions.