The Ultimate Guide to Deep Well Pump Installation: A Comprehensive Playbook

Proper deep well pump installation is crucial for ensuring efficient and reliable water supply from your well. This comprehensive guide delves into the key data points and technical considerations that must be meticulously evaluated to achieve a successful deep well pump setup. From selecting the right pump type to calculating the precise lift requirements, this playbook will equip you with the knowledge and tools necessary to tackle your deep well pump installation project with confidence.

Selecting the Appropriate Deep Well Submersible Pump

The first and most critical step in deep well pump installation is choosing the right type of submersible pump. This decision is primarily based on the diameter and depth of your well.

Matching Pump Size to Well Diameter

• For a 200mm (8-inch) bore diameter well, the suitable pump options are typically 8JD or SD8 models.
• Maintaining adequate clearance between the pump and the well casing is essential to prevent interference and ensure smooth operation.
• Pump diameter should be at least 2 inches smaller than the well diameter to allow for proper water flow and prevent the pump from getting stuck.

Considering Well Depth

• The depth of the well is a key factor in determining the appropriate pump type and size.
• Submersible pumps are available in various stages or impeller configurations to accommodate different lift requirements.
• Deeper wells generally necessitate pumps with higher stages or more impellers to overcome the increased lift.
• Consulting the manufacturer’s specifications and recommendations is crucial to select the optimal pump for your well depth.

Calculating the Water Level Drop

Determining the water level drop is a crucial step in deep well pump installation, as it directly impacts the selection of the pump and the overall system design.

Measuring the Flow Rate (Qe)

• Measure the flow rate (Qe) of the well when the water level is at its rated value.
• This can be done by capturing the water flow in a container of known volume and timing the fill rate.
• Accurate flow rate measurement is essential for calculating the water level drop.

Calculating the Water Level Drop (SM)

• The water level drop (SM) is calculated by multiplying the flow rate (Qe) by the specific speed (S) of the pump.
• The specific speed (S) is a pump performance characteristic provided by the manufacturer.
• SM = Qe × S

Determining the Depth of the Moving Water Level (Hd)

The depth of the moving water level (Hd) is a critical parameter that must be accurately calculated for proper deep well pump installation.

Calculating the Depth of the Moving Water Level

• Hd = Hi + SM
• Where:
• Hd = Depth of the moving water level (m)
• Hi = Static water level (m)
• SM = Water level drop (m)

Measuring the Total Length of the Submersible Pump Pipe (L)

The total length of the submersible pump pipe (L) is another essential data point for deep well pump installation.

Calculating the Total Pipe Length

• L = Ha + M
• Where:
• L = Total length of the submersible pump pipe (m)
• Ha = Static water level (m)
• M = Total length of the aqueduct (m)

Ensuring Compliance with Manufacturer Specifications

• The calculated total pipe length (L) should not exceed the maximum length specified by the pump manufacturer.
• Exceeding the recommended pipe length can lead to performance issues and potential damage to the pump.

Determining the Total Loss Head (Hz)

The total loss head (Hz) is a crucial factor in calculating the lift required for the deep well pump.

Calculating the Total Loss Head

• Hz = 0.1 × h × L
• Where:
• Hz = Total loss head (m)
• h = Friction loss per meter of pipe (m/m)
• L = Total length of the submersible pump pipe (m)

Factors Affecting Friction Loss

• Pipe diameter: Smaller diameter pipes have higher friction loss.
• Flow rate: Higher flow rates result in increased friction loss.
• Pipe material: Rougher pipe materials, such as galvanized steel, have higher friction loss compared to smoother materials like PVC.

Calculating the Lift Required (Hx)

The lift required (Hx) is the final parameter that determines the appropriate deep well pump selection and configuration.

Determining the Lift Required

• Hx = Hd + Hz
• Where:
• Hx = Lift required (m)
• Hd = Depth of the moving water level (m)
• Hz = Total loss head (m)

Selecting the Appropriate Pump Head Series

• Based on the calculated Hx, the pump impeller series is selected to ensure the water pump’s rated lift is not less than Hx.
• The formula for this is: He = K × Hx, where:
• He = Rated lift of the water pump (m)
• K = Reserve factor, typically around 1.1 – 1.2

By meticulously calculating and considering these key data points, you can ensure the selection and installation of the most suitable deep well submersible pump for your specific application. This comprehensive playbook will guide you through the process, empowering you to achieve a successful and efficient deep well pump installation.

References:

• Hellen Jiang, “What data should be calculated when deep well submersible pump used?”, LinkedIn, 2017.
• Han, Yoo Min MD, PhD et al., “Visceral Adipose Tissue Reduction Measured by Deep Neural Neural Network Architecture Using Computed Tomography”, The American Journal of Gastroenterology, 2024.
• Grundfos, “Pump sizing and installation in domestic groundwater applications”, Ecademy, 2024.