How to choose the suitable vertical long shaft semi submersible turbine pumps?

Choosing a suitable vertical long shaft semi submersible turbine pump requires comprehensive consideration of flow rate, head, medium characteristics, pipeline layout, operating conditions, and economy. The following are specific steps and analysis:
1、 Clarify the core parameter requirements
Flow rate and head
Flow rate: Determine the required amount of liquid to be transported based on process requirements (such as leakage in industrial processes and leakage and evaporation in agricultural irrigation).
Head: Calculate the pressure drop (head loss) of the suction tank, drainage tank, and pipeline system, for example, the head loss of the lifting pipe and filter screen is about 1 meter every 5 meters.
Matching principle: The flow rate of the pump should be equal to or slightly less than the optimal flow rate of the system, and the head should cover the actual demand (including losses).
Medium characteristics
Physical properties: temperature, density, viscosity, solid particle diameter and content (such as maximum size and specific gravity of sewage particles).
Chemical properties: corrosiveness, toxicity, etc., determine the material (such as stainless steel, fluoroplastic) and shaft seal form (such as packing seal, mechanical seal) of the vertical long shaft semi submersible turbine pump.
Special requirements: For media containing abrasive particles, wear-resistant vertical long shaft semi submersible turbine pumps (such as impellers made of hard alloy material) should be selected.
2、 Optimize pipeline layout design
Pipe diameter
Excessive diameter: high cost, but low resistance loss.
Small diameter: High resistance loss, increasing the head and energy consumption of vertical long shaft semi submersible turbine pumps.
Suggestion: Choose a reasonable diameter based on the flow rate and velocity (usually the economic flow rate is 1.5-3m/s).
Pipeline layout
Try to minimize bends and accessories and shorten the length of the pipeline.
The bending radius of the elbow should be 3-5 times the diameter of the pipeline, and the angle should be ≥ 90 ° to reduce resistance.
Valves (such as ball valves, globe valves) and check valves must be installed on the discharge side to prevent backflow and water hammer impact.
3、 Adapt to operating conditions
Environmental factors
Altitude: The impact of thin air on the performance of vertical long axis semi submersible turbine pumps needs to be considered in high-altitude areas.
Temperature: Extreme temperatures may affect the pump material and lubrication method (such as requiring special cooling systems for high temperatures).
Continuous operation: A backup vertical long shaft semi submersible turbine pump should be prepared to avoid failure caused by prolonged operation of a single vertical long shaft semi submersible turbine pump.
Installation requirements
The pump diameter should be 25-50mm smaller than the wellbore diameter to avoid vibration damage caused by close contact with the wellbore.
The underwater depth needs to be matched with the multi section lifting pipe design of the vertical long axis semi submersible turbine pump (if customized to a maximum of 20 meters or more).
4、 Balancing Economy and Reliability
Cost composition
Equipment cost: including initial investment in pump body, motor, control cabinet, etc.
Operating costs: energy consumption, maintenance frequency, and spare parts costs.
Management fee: Installation, commissioning, and after-sales service fees.
Suggestion: Choose a pump type with low lifecycle cost (such as an efficient and energy-saving vertical long shaft semi submersible turbine pump that can reduce long-term electricity costs).
Manufacturer and after-sales service
Priority should be given to reputable and professional manufacturers of vertical long shaft semi submersible turbine pumps, such as Hunan Perfect Industry, to ensure high precision and reliable quality of components.
Confirm whether the manufacturer of the vertical long shaft semi submersible turbine pump can provide comprehensive selection support and after-sales service (such as quick response maintenance).
5、 Typical application scenario selection example
Municipal water supply and drainage
Requirement: High flow rate, medium head, capable of transporting clean water or wastewater containing small amounts of impurities.
Recommendation: Closed impeller vertical long shaft semi submersible turbine pump, made of stainless steel and equipped with an automatic exhaust system.
Sewage treatment plant
Requirement: Corrosion resistant, wear-resistant, capable of transporting wastewater containing solid particles.
Recommendation: Semi open impeller vertical long shaft semi submersible turbine pump, made of duplex steel, with external cooling and lubricating water for the guide bearings.
Mining Metallurgy
Requirement: High lift, high flow rate, for conveying mud or corrosive liquids.
Recommendation: Multi stage guide vane vertical long shaft semi submersible turbine pump, equipped with wear-resistant coating and mechanical seal for shaft seal.
Agricultural irrigation
Requirement: Energy saving, easy to maintain, capable of transporting clean or sandy water.
Recommendation: Single stage centrifugal vertical long shaft semi submersible turbine pump, made of cast iron and equipped with a simple control cabinet.