3.2 Requirements Post-Cessation of Centrifugal Pump Operation
After the centrifugal pump stops operating, close the pump's inlet valve and then, after the pump has cooled down, close the valves of the auxiliary system in turn.
②High-temperature pump shutdown should be carried out according to the equipment's technical specifications. After shutdown, the pump should be rotated half a turn every 20 to 30 minutes until the pump body temperature drops to 50℃.
③During shutdown of low-temperature pumps, the pump should be kept filled with liquid unless otherwise specified; both the suction and discharge valves should remain open; for low-temperature pumps with double-face mechanical seals, the liquid level controller and the sealing fluid in the pump's sealing chamber should maintain the grouting pressure of the pump.
④ Pumps for transporting media that are prone to crystallization, solidification, and sedimentation should prevent clogging after shutdown and be flushed with clean water or other media promptly. ⑤ Drain the accumulated liquid in the pump to prevent rusting and cracking due to freezing.
Maintain
3.1 Analysis of Centrifugal Pump Mechanical Seal Failure
Centrifugal pump shutdown is primarily caused by the failure of the mechanical seal. The manifestation of failure is usually leakage, with the following reasons for leakage:
Features
By inhalation method
Single-stage pump liquid enters the impeller from one side, resulting in an axial force.
The double-suction pump's liquid enters from both sides into the impeller, eliminating axial force, and the pump's flow rate is almost doubled compared to a single-suction pump.
By grade
II. Product Features:
1. Utilizing an excellent hydraulic model and advanced manufacturing techniques, the pump's performance and service life are significantly enhanced.
2. The mechanical seal using hard alloy and fluororubber for the shaft seal enhances the pump's reliability and the temperature of the conveyed medium.
3. The overflow section of the pump is made of stainless steel plate stamping and welding, making the pump suitable for slightly corrosive mediums.
4. Compact overall structure, small size, light weight, low noise, significant energy-saving effect, and easy maintenance.
5. The pump's inlet and outlet are on the same level as the pump base, allowing direct usage in pipelines.
6. Standard motors are used, allowing users to easily equip the motor as needed.
7. Smart protectors can be equipped according to customer needs, providing effective protection against dry running, phase loss, and overload.
III. Product Applications:
Water Supply: Water plant filtration and transmission, district water supply from water plants, main pipeline pressure increase, high-rise building pressure increase.
Industrial Boosting: Process Water Systems, Cleaning Systems, High-Pressure Washing Systems, Fire Protection Systems.
Industrial Liquid Transportation: Cooling and air conditioning systems, boiler make-up and condensate systems, machine tool accessories, acidic and alkaline medium transportation.
Water Treatment: Ultrafiltration systems, reverse osmosis systems, distillation systems, separators, and swimming pool water treatment systems.
Irrigation: Field irrigation, sprinkler irrigation, drip irrigation.
Four: Conveying Medium:
1. Non-flammable and non-explosive medium, thin, clean, and free of solid particles or fibers.
2. Mineral water, softened water, pure water, refined oil, and other light chemical industry media.
3. The pump is mainly made of stainless steel and is suitable for pumping mild corrosive media.
V. Technical Specifications:
LQDLF
LQDLF
Flow Rate: 1-22 m³/h
Flow Range: 6-232m
Power: 0.37-15 kW
RPM: 2900 rpm
Bore: φ25-φ50
Temperature Range: -15℃ to +120℃
Six, Model Significance: CDL - Light Vertical Multistage Centrifugal Pump F - Flow Component in Stainless Steel (304 or 316) 2 - Rated Flow (m³/h) 70 - Stage x 10
6. Smooth Operation: The concentricity of the pump shaft and the excellent dynamic balance of the impeller ensure smooth operation and minimal vibration. Leakproof: Hard alloy seals made of different materials guarantee leak-proof delivery of various media. Low Noise: The pump, supported by two low-noise bearings, operates smoothly with minimal noise, primarily just the faint sound of the motor. Low Failure Rate: Simple and reasonable structure with key parts made of quality materials; the overall failure-free working time is significantly increased. Easy Maintenance: Replacing seals and bearings is simple and convenient. Space-Saving Design: The outlet can be positioned left, right, or upward, making it easy for pipeline layout and installation, thus saving space.