b. Centrifugal pump filling
Before starting the pump, the pump housing and suction pipe must be filled with water first, as air present prevents the formation and maintenance of a vacuum by the pump suction.
c. Centrifugal Pump Warm-up Pump
Multistage centrifugal pumps for transporting high-temperature liquids, such as feedwater pumps for power plant boilers, must be pre-heated before startup. This is because, during startup, high-temperature feedwater passes through the pump, causing the pump body temperature to rapidly increase from ambient to 100-200°C. This temperature difference between the inside and outside of the pump and its various components can lead to uneven expansion without adequate heat transfer time and proper temperature control measures. This can cause deformation, wear, vibration, and bearing seizing accidents in different parts of the pump body.

II. Product Features:
1. Utilizing superior hydraulic models and manufacturing techniques, significantly enhances the pump's performance and lifespan.
2. The mechanical seal using hard alloy and fluororubber as the shaft seal material enhances the pump's operational reliability and the temperature of the transported medium.
3. The overflow section of the pump is made of stainless steel plate stamping and welding, allowing the pump to be suitable for mildly corrosive media.
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 horizontal line as the pump base, making them directly usable in pipelines.
6. Standard motors are used, allowing users to easily equip the motor according to their needs.
7. Smart protectors can be equipped according to customer requirements, providing effective protection against dry running, phase loss, overload, and more.
III. Product Application:
Water Supply: Waterworks filtration and conveyance, zoned water supply from waterworks, main pipeline pressure boosting, high-rise building pressure boosting.
Industrial Boosting: Process Water Systems, Cleaning Systems, High-Pressure Washing Systems, Fire Protection Systems.
Industrial Liquid Transfer: Cooling and Air Conditioning Systems, Boiler Feed and Condensing Systems, Machine Tool Accessories, Acid and Alkaline Medium Transfer.
Water Treatment: Ultrafiltration systems, reverse osmosis systems, distillation systems, separators, and pool water treatment systems.
Irrigation: Field irrigation, sprinkler irrigation, drip irrigation.
IV. Transmission Medium:
Non-flammable and non-explosive medium, thin, clean, free of solid particles or fibers.
2. Mineral water, softened water, pure water, refined oil, and other light chemical industry media.
3. Pumps are primarily made of stainless steel, suitable for transferring mildly corrosive mediums.
V. Technical Specifications:
LQDLF
LQDLF
Flow Rate: 1-22 m³/h
Flow Rate: 6-232m³/h
Power: 0.37-15 kW
RPM: 2900 r/min
Bore size: φ25 - φ50
Temperature Range: -15°C to +120°C
6. Model Meaning: CDL - Light Vertical Multistage Centrifugal Pump F - Flow Parts Made of Stainless Steel (304 or 316) 2 - Rated Flow (m³/h) 70 - Stage × 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 of different materials ensure no leakage in the transport of various media. Low Noise: The pump, supported by two low-noise bearings, operates smoothly with minimal noise, mainly just the faint sound of the motor. Low Failure Rate: Simple and rational structure; key parts are made with matching components, significantly increasing the trouble-free operation time of the entire unit. Easy Maintenance: Replacing seals and bearings is simple and convenient. Space-saving Design: The outlet can be directed left, right, or up, facilitating pipeline layout and installation, and saving space.

Maintain
3.1 Analysis of Centrifugal Pump Mechanical Seal Failure
The shutdown of centrifugal pumps is primarily caused by the failure of mechanical seals. The manifestation of failure is usually leakage, and the causes of leakage include the following:

The pump casing is divided into sections along a plane perpendicular to the shaft, which are connected to each other with long bolts.
Split case for centrifugal pump, divided in the plane perpendicular to the axis of rotation
Screw casing pumps are centrifugal pumps equipped with helical water pressure chambers, such as the commonly used end-suction cantilever centrifugal pumps.
Turbine-type pump equipped with a guide vane water pressurizing chamber centrifugal pump
Structure
The pipeline pump is a part of the piping system and requires no alteration to the pipeline during installation.
Submersible pump and motor integrated, designed for immersion in water
Submersible pump housing immersed in liquid
The shielded pump impeller is integrated with the motor rotor and housed within a single sealed casing, eliminating the need for a separate sealing structure, making it a leak-free pump.
The magnetic pump is fully enclosed except for the inlet and outlet. The connection between the pump and the motor is driven by magnetic attraction using magnets.
Self-priming pump requires no priming fluid when starting up.
High-speed pumps increase the pump shaft speed through a speed-increasing box, typically achieving speeds above 10,000 rpm, and can also be referred to as part-flow pumps or tangential pressure boost pumps.
The vertical cylinder pump has its inlet and outlet connections at the same height on the top. It features an inner and outer casing, with the inner casing consisting of a rotor, guide vanes, etc., and the outer casing serving as the inlet flow channel, where the liquid is drawn in from the bottom.
ISG Residential Water Pump, Domestic Water Pump, Community Water Pump, Domestic Supply and Drainage Equipment, designed based on the performance parameters of IS, IR centrifugal pumps and the special structure of vertical pumps, and manufactured in strict accordance with ISO2858 standards. Designed using domestic hydraulic models, it is an ideal new generation horizontal pump product. This product uses hard alloy mechanical seals exclusively. Application Range: ISW pumps are suitable for industrial and urban supply and drainage, such as high-rise building pressure boosting, garden sprinkling, fire fighting pressure boosting, long-distance transportation, HVAC refrigeration cycles, bathroom pressure boosting, and equipment matching, with operating temperatures not exceeding 85°C. ISWR pumps are widely used in metallurgy, chemical industry, textile, papermaking, and catering industry boiler water pressure boosting, transportation, and urban heating systems. SGWR type has an operating temperature not exceeding 120°C.