Submersible Pump Specifications: What A Data Sheet Must Show

A Complete Set Of Submersible Pump Specifications Must Show The Required Duty Point, Pump Curve, Operating Range, Motor Data, Component Materials, Dimensions, Cable Requirements, Liquid Limits, And Test Basis. A Model Number, Horsepower Rating, Maximum Flow, And Maximum Head Are Not Enough To Approve A Pump.

The Most Reliable Review Uses Three Separate Layers:

1. Selection Inputs: What The Well And Water System Require.
2. Manufacturer Commitments: What The Offered Pump Will Deliver.
3. Acceptance Evidence: What Documents Or Tests Will Prove Compliance.

This Structure Prevents Buyers From Mistaking A Supplier Assumption For A Project Requirement. It Also Makes Competing Data Sheets Easier To Compare.

Quick Submersible Pump Specifications Checklist

Use This Table Before Approving A Deep-Well Pump Data Sheet.

Why Are Basic Submersible Pump Specifications Not Enough?

Many Product Listings Show Only:

• Motor Power
• Maximum Flow
• Maximum Head
• Nominal Pump Diameter
• Outlet Size
• Voltage

However, These Values Only Help Buyers Eliminate Obviously Unsuitable Models. They Do Not Confirm The Actual Operating Point.

For Example, A Pump Listed With A Maximum Flow Of 20 Cubic Meters Per Hour And A Maximum Head Of 200 Meters Does Not Normally Deliver 20 Cubic Meters Per Hour At 200 Meters. Maximum Head Usually Occurs Near Zero Flow, While Maximum Flow Occurs At Much Lower Head.

Therefore, The Data Sheet Must Show The Complete Q-H Relationship Or At Least Several Verified Performance Points. The Buyer Must Then Locate The Required Flow And TDH On That Curve.

Layer 1: Define The Buyer’s Selection Inputs

The First Layer Describes The Water System, Not The Pump. Without These Inputs, A Manufacturer Can Only Make Assumptions.

Required Flow

State The Normal Required Flow, Peak Flow, And Minimum Acceptable Flow When They Differ. Also State The Unit Clearly, Such As Cubic Meters Per Hour, Liters Per Second, Or GPM.

Therefore, Required Flow Should Reflect The Actual Application And Sustainable Well Yield. A Larger Flow Number Does Not Automatically Produce A Better System.

Required Total Dynamic Head

Total Dynamic Head Should Include:

• Lift From The Dynamic Water Level
• Elevation After The Wellhead
• Required Outlet Pressure
• Friction Through Pipe, Valves, And Equipment

Do Not Use Total Well Depth As TDH Unless The Hydraulic Layout Truly Requires It. Review What Size Submersible Well Pump Do I Need If You Have Not Yet Calculated The Duty Point.

Minimum And Maximum System Head

A Well System Does Not Always Operate At One Head. Water Level, Tank Pressure, Valve Position, Filter Condition, And Irrigation Zones Can Change The System Curve.

Consequently, Give The Manufacturer The Minimum, Normal, And Maximum Expected TDH. The Offered Pump Must Remain Inside Its Permitted Flow, Power, And Thrust Range At All Three Conditions.

Well And Installation Data

Next, State:

• Total Well Depth
• Static Water Level
• Dynamic Water Level And The Test Flow
• Lowest Seasonal Water Level
• Pump Setting Depth
• Casing Internal Diameter
• Known Well Deviation Or Restrictions
• Riser Pipe Material, Diameter, And Length

For Example, A Dynamic Water Level Without Its Pumping Flow Is Incomplete. Drawdown Changes When The Test Flow Changes.

Liquid And Operating Data

Also Provide Water Temperature, pH, Chlorides, Sand Content, Daily Operating Hours, Starts Per Hour, And Any Chemical Or Abrasive Conditions. These Inputs Affect Materials, Clearances, Motor Cooling, And Service Life.

Layer 2: Read The Manufacturer’s Hydraulic Specifications

Next, The Second Layer Defines What The Proposed Pump Will Do Under Stated Conditions.

Duty Point Versus Maximum Head And Maximum Flow

The Duty Point Is A Flow And Head Pair. Write It In One Line, For Example:

Required Duty Point: 12 Cubic Meters Per Hour At 93 Meters TDH

In Contrast, “Maximum Head 150 Meters” And “Maximum Flow 25 Cubic Meters Per Hour” Describe Different Ends Of The Curve. Never Combine Them Into A False Operating Point.

Pump Performance Curve

A Useful Submersible Pump Performance Curve Should Identify:

• Pump Model And Stage Count
• Speed And Frequency
• Flow And Head
• Efficiency
• Power Demand
• Recommended Operating Range
• Test Liquid Or Reference Conditions

First Confirm That The Curve Matches The Exact Offered Model. Next Plot The Required Duty Point. Finally, Check The Pump At The Minimum And Maximum Expected System Head.

Recommended Operating Range

Do Not Approve The Pump Merely Because Its Curve Crosses The Required Point. Instead, Require The Data Sheet To Define The Manufacturer’s Permitted Or Recommended Flow Range.

Operation Too Far Left On The Curve Can Increase Heating, Recirculation, And Downthrust In Some Designs. Operation Too Far Right Can Increase Power Demand, Upthrust, And Well Drawdown. Therefore, The Normal Duty Should Remain In A Favorable Region Rather Than At An Extreme.

Pump Efficiency

Tie Efficiency To A Specific Flow And Head. However, A Single Peak-Efficiency Number Does Not Show Efficiency At The Project Duty Point.

When Comparing Two Pumps, Use Efficiency At The Same Required Duty. Also Confirm Whether The Value Describes The Pump End Only Or The Complete Pump-And-Motor System.

Hydraulic Power, Shaft Power, And Electrical Input

These Values Are Related But Not Identical:

• Hydraulic Power: Energy Delivered To The Water
• Pump Shaft Power: Mechanical Power Required By The Pump End
• Motor Output Power: Mechanical Power Available At The Motor Shaft
• Electrical Input Power: Power Drawn From The Electrical Supply

For Clean Water, Preliminary Hydraulic Power Can Be Estimated With:

Hydraulic Power In kW = Flow In Cubic Meters Per Hour × Head In Meters ÷ 367

However, The Motor Must Also Cover Pump Efficiency, Motor Efficiency, Operating Range, And Applicable Service Margin. Ask The Manufacturer To State Which Power Value Appears On The Data Sheet.

How To Read Mechanical Submersible Pump Specifications

Mechanical Data Determines Whether The Pump Fits The Well, Connects To The Riser, And Resists The Actual Water.

Maximum Outside Diameter

“4-Inch Pump” Is A Nominal Product Class, Not A Guarantee That The Complete Assembly Has An Exact 4-Inch Diameter.

Request The Maximum Outside Diameter With The Cable Guard, Cable, Fasteners, And Any Project Accessories Installed. Then Compare It With The Smallest Verified Internal Diameter Of The Well.

Overall Length And Weight

Therefore, The Data Sheet Should Show:

• Pump-End Length
• Motor Length
• Complete Assembled Length
• Dry Weight
• Approximate Installed Lifting Load When Relevant

A High-Stage Pump May Fit The Casing Diameter But Still Be Difficult To Lower Through A Deviated Well. Length And Weight Also Affect Handling Equipment And Service Planning.

Discharge Connection

State The Connection Size, Thread Or Flange Standard, Pressure Rating, And Material. A “2-Inch Outlet” Is Incomplete If The Supplier And Buyer Use Different Thread Standards.

The Outlet Size Also Does Not Automatically Determine The Best Pipe Diameter. Use The Actual Flow, Friction, Pressure, And Suspended Load When Selecting Submersible Pump Pipe Size.

Stage Count

Stage Count Helps Identify The Offered Configuration, But It Is Not A Performance Specification By Itself. Different Hydraulic Families Can Produce Different Head Per Stage.

Therefore, Use Stage Count To Confirm Model Identity And Construction. Use The Pump Curve To Confirm Flow And Head.

Component-Level Materials

A Complete Material Schedule Should Identify At Least:

• Outer Casing
• Impellers
• Diffusers
• Pump Shaft
• Coupling
• Intake Strainer
• Discharge Head
• Bearings Or Bushings
• Fasteners
• Check-Valve Components

Do Not Accept “Stainless Steel” As A Complete Material Specification. It May Describe Only The Outer Casing, And It Does Not Identify Whether The Grade Is AISI 304, AISI 316, Duplex, Or Another Alloy.

How To Read Motor And Electrical Specifications

Review The Pump And Motor As One Operating Unit.

Rated Motor Output

The Motor kW Or HP Usually Describes Rated Mechanical Output, Not The Pump’s Water Output And Not Necessarily The Electrical Input.

Check That The Motor Can Carry The Pump Load Across The Entire Permitted Operating Range. A Motor That Is Adequate At The Design Point May Overload At A Lower System Head If The Pump Moves Farther Right On The Curve.

Voltage, Frequency, And Phase

The Data Sheet Must State:

• Rated Voltage And Permitted Variation
• 50 Hz Or 60 Hz
• Single-Phase Or Three-Phase
• Rated Current
• Speed
• Starting Method

Frequency Changes Pump Speed, Flow, Head, And Power. Therefore, Never Approve A 50 Hz Pump Using Only A 60 Hz Curve.

Motor Construction

Next, Identify Whether The Motor Is Water-Filled, Oil-Filled, Encapsulated, Or Rewindable. Also Confirm Insulation, Enclosure Or Ingress Protection, Bearing Arrangement, Thrust Capacity, Permitted Temperature, And Required Cooling Conditions.

Franklin Electric’s Application, Installation, And Maintenance Resources Connect Motor Application, Cable Selection, Installation, And Protection In One Technical Reference.

Cable And Lead Length

The Data Sheet Should Separate:

• Factory Motor Lead Length
• Supplied Drop-Cable Length
• Recommended Conductor Size
• Maximum Circuit Length For The Selected Conductor
• Cable Insulation And Temperature Rating
• Waterproof Splice Requirement

However, A Short Factory Lead Is Not A Complete Well Cable. Use A Verified Submersible Pump Cable Calculation Based On Current, Voltage, Phase, Route Length, Starting Method, And Allowable Voltage Drop.

Control And Protection Requirements

State Whether The Motor Requires A Control Box, Starter, Soft Starter, Or VFD. Also Define Overload, Short-Circuit, Phase, Voltage, Dry-Run, Level, And Temperature Protection Where Applicable.

If A Protection Device Is Optional, The Data Sheet Should Identify The Operating Risk That The Option Controls. This Makes It Easier To Separate Required Protection From Unnecessary Features.

Check The Application Limits In Submersible Pump Specifications

Moreover, Footnotes Often Contain The Application Limits That Determine Whether The Pump Survives.

Water Temperature

State The Maximum Continuous Water Temperature And Any Motor Derating Above The Standard Condition. Hotter Water Can Reduce Motor Cooling And Change Material, Cable, Bearing, And Seal Requirements.

Sand Content

The Data Sheet Should State The Permitted Sand Concentration, Particle Condition, Or Manufacturer Limitation. However, A Sand-Tolerant Pump Does Not Correct A Poorly Developed Or Damaged Well.

If The Supplier Gives Only A Percentage, Ask Whether The Supplier Measured It By Weight Or Volume And Whether It Applies Continuously Or For Short Periods.

Water Chemistry

Therefore, Water Analysis Should Guide Material Selection. Include Chlorides, pH, Salinity, Iron, Manganese, And Any Aggressive Chemical Conditions.

Standard Stainless Steel Is Not Universally Corrosion-Proof. Therefore, The Manufacturer Should Confirm Material Compatibility For The Stated Water Rather Than Relying Only On A General Material Name.

Minimum Submergence And Motor Cooling

The Pump Intake Must Remain Below The Dynamic Water Level With Adequate Margin. At The Same Time, The Motor May Require A Minimum Water Velocity Along Its Surface.

The Data Sheet Should Define Minimum Submergence, Maximum Setting Depth Or Immersion Pressure, Permitted Orientation, And Any Need For A Flow Sleeve.

Layer 3: Define Acceptance Evidence

Finally, The Third Layer Answers A Different Question: How Will The Buyer Confirm That The Delivered Pump Matches The Approved Data Sheet?

Published Curve Versus Individual Test

A Published Family Curve Shows Expected Model Performance. An Individual Factory Test Records The Performance Of A Specific Pump Or Pump Assembly.

For Example, Routine Factory Inspection And A Published Curve May Be Sufficient For Standard Orders. In Contrast, Critical Municipal, Industrial, Or High-Value Projects May Require An Individual Performance Test, Witnessed Test, Or Third-Party Inspection.

Test Standard And Tolerance

Do Not Request A “Zero-Tolerance” Performance Test Without A Defined Engineering Basis. Instead, State The Test Standard, Acceptance Grade, Guaranteed Point, Measurement Scope, And Permitted Tolerance.

ISO 9906 Defines Hydraulic Performance Acceptance Tests For Rotodynamic Pumps And Includes Different Acceptance Grades. The Purchase Specification Should Identify The Applicable Standard And Grade Rather Than Mentioning Only “ISO Test.”

Required Submittals

Depending On Project Risk, Request:

• Completed Pump Data Sheet
• Certified Q-H Curve
• Efficiency And Power Curve
• Motor Data Sheet
• General Arrangement Drawing
• Component Material Schedule
• Cable Recommendation
• Control Diagram
• Factory Test Report
• Material Certificates
• Installation And Operation Manual
• Spare-Parts List
• Warranty Scope

Therefore, Request These Documents Before Order Approval. Otherwise, The Supplier May Treat Them As Additional Work After Production.

Submersible Pump Specifications Comparison Sheet

Finally, Use One Sheet For Every Supplier.

However, Do Not Mark A Field Compliant Because The Supplier Writes “Yes.” Record The Curve, Drawing, Certificate, Or Manual Section That Supports The Answer.

Example: How To Audit An Incomplete Data Sheet

Assume A Listing Shows:

• 4-Inch Submersible Pump
• 5.5 kW
• Maximum Flow: 20 Cubic Meters Per Hour
• Maximum Head: 200 Meters
• Stainless Steel
• 380 V

This Information Does Not Confirm:

• The Flow Available At The Required Head
• Whether The Curve Is 50 Hz Or 60 Hz
• The Exact Stage Count
• The Recommended Operating Range
• Pump Efficiency And Maximum Power
• Whether 5.5 kW Means Motor Output Or Electrical Input
• Three-Phase Or Single-Phase Power
• Rated Current And Starting Method
• Actual Maximum Outside Diameter
• Which Components Use Which Stainless Steel Grade
• Permitted Sand And Water Temperature
• Cable Length And Conductor Size
• Test Standard And Acceptance Tolerance

Therefore, This Listing Can Support Initial Product Search, But It Cannot Support Final Technical Approval.

Common Submersible Pump Specification Mistakes

Treating Maximum Flow And Head As One Point

Maximum Flow And Maximum Head Usually Occur At Different Ends Of The Curve.

Selecting By Motor Power

Equal Motor Power Does Not Guarantee Equal Flow, Head, Efficiency, Stage Count, Or Pump Diameter.

Ignoring The Curve Frequency

Do Not Use A 60 Hz Curve As The Guaranteed 50 Hz Performance.

Using Nominal Pump Diameter As Actual Diameter

The Cable Guard And Accessories May Create The Largest Installation Diameter.

Accepting A General Material Description

“Stainless Steel” Does Not Identify The Grade Or The Components Made From It.

Omitting Maximum Power Demand

Motor Selection Must Cover The Pump Load Across The Permitted Operating Range, Not Only At One Point.

Ignoring Footnotes

Temperature, Sand, Submergence, Orientation, And Cooling Limits Often Appear Outside The Main Performance Table.

Requesting Documents After Production

Define Special Tests, Certificates, Drawings, And Third-Party Inspection Before Order Placement.

Frequently Asked Questions About Submersible Pump Specifications

What Are The Most Important Submersible Pump Specifications?

Prioritize Required Flow At TDH, Complete Pump Curve, Recommended Operating Range, Motor Power And Current, Component Materials, Maximum Diameter, Voltage, Frequency, Phase, Cable Requirement, Liquid Limits, And Test Basis.

Is Maximum Head The Pump’s Rated Head?

No. Maximum Head Usually Occurs Near Zero Flow. Always Pair Rated Or Duty Head With A Stated Operating Flow.

Can Two Pumps With The Same HP Have Different Performance?

Yes. They May Use Different Hydraulic Families, Impeller Designs, Stage Counts, Speeds, And Pump Diameters. Compare Their Curves At The Required Duty Point.

What Does P1 And P2 Mean On A Pump Data Sheet?

The Manufacturer Must Define The Exact Labeling On Its Data Sheet. Commonly, P1 Refers To Electrical Input Power And P2 Refers To Mechanical Output Power. Do Not Assume The Meaning When The Sheet Does Not Define It.

Why Must Frequency Appear In Submersible Pump Specifications?

Frequency Affects Motor Speed And Therefore Changes Pump Flow, Head, And Power. The Performance Curve Must Match The Actual 50 Hz Or 60 Hz Supply.

Does A 4-Inch Pump Fit Every 4-Inch Well?

Not Automatically. Compare The Pump’s Maximum Actual Diameter With The Well’s Minimum Internal Diameter, Including Cable Guard, Cable, Couplings, Encrustation, And Deviation.

Should Every Pump Receive An Individual Performance Test?

Not Necessarily. The Required Test Scope Depends On Project Risk, Order Value, Standard Practice, And Contract Requirements. Critical Projects May Justify Individual Or Witnessed Testing.

What Documents Should A Supplier Provide Before Order Approval?

Request The Completed Data Sheet, Pump Curve, Motor Data, Dimensional Drawing, Material Schedule, Cable Recommendation, Control Requirements, Test Basis, Installation Manual, And Warranty Scope.

Final Answer

Reliable Submersible Pump Specifications Must Connect The Project Requirement To A Specific Manufacturer Commitment And A Clear Acceptance Record.

First Define The Required Flow, TDH, Operating Range, Well, Water, And Electrical Supply. Next Confirm The Exact Pump Curve, Motor, Materials, Dimensions, Cable, And Application Limits. Finally, Define Which Drawing, Data Sheet, Certificate, Or Test Report Will Prove Compliance.

For Project-Specific Submersible Pump Selection, Send Liyuan Pump Your Well Data, Duty Point, Water Analysis, Electrical Supply, Cable Route, Control Requirements, And Required Test Documents. Liyuan Can Then Return A Complete Pump-And-Motor Data Package For Technical Review.

Email:Liyuan@liyuan-pump.com

WhatsApp:+86 181-2828-2767