End suction chilled water pump specs

End Suction Chilled Water Pump Specifications | Technical Guide by EKG (Malaysia) Sdn Bhd

Precision Engineering for Reliable Chilled Water Circulation
End suction centrifugal pumps are the industry standard for chilled water circulation, valued for their simplicity, reliability, and efficiency. Correct technical specification ensures optimal performance, energy savings, and longevity. EKG (Malaysia) Sdn Bhd provides this technical guide and professional specification support to ensure your chilled water pump is perfectly matched to your system's hydraulic requirements.

Critical Technical Specifications

For accurate pump selection, the following parameters must be defined:

1. Hydraulic Performance Requirements

• Flow Rate (Q): ______ m³/h (or L/s) at design conditions.

• Total Dynamic Head (TDH): ______ meters. This must be accurately calculated including:

  • Chiller evaporator pressure drop (typically 5-12m)

  • Pipe friction losses (entire circuit)

  • Cooling coil/terminal unit pressure drops

  • Control valve pressure drop (fully open)

  • Strainer, fitting, and balancing valve losses

• Duty Point: The intersection of required Flow and Head on the pump curve.

• Net Positive Suction Head Available (NPSHa): ______ meters. Must exceed pump NPSH required (NPSHr).

2. Pump Construction & Materials (Standard for Closed Chilled Water Loops)

• Casing: Cast iron (Grade 250), flanged to PN16/ANSI 125.

• Impeller: Bronze (C95800) or cast iron, dynamically balanced to ISO 1940 G6.3 or better.

• Shaft: Stainless steel (AISI 416 or equivalent), minimum diameter sized for continuous duty.

• Wear Rings: Renewable, bronze or cast iron.

• Shaft Seal: Mechanical seal, single or double. Standard: Carbon/Ceramic faces, EPDM elastomers. Alternative: Silicon carbide for abrasive conditions.

• Bearings: Deep groove ball bearings, grease-lubricated, L10 life > 100,000 hours.

3. Motor Specifications

• Efficiency Class: Minimum IE3 (Premium Efficiency) per MS IEC 60034-30-1. IE4/IE5 recommended for optimal life-cycle cost.

• Power: ______ kW, sized with a service factor of 1.15 minimum.

• Voltage/Frequency: 415V, 3-phase, 50Hz (standard Malaysian supply).

• Insulation Class: Class F (155°C) with Class B (130°C) temperature rise.

• Protection: IP55 enclosure minimum (Totally Enclosed Fan Cooled - TEFC).

• Starting Method: Direct-On-Line (DOL). Specify if VFD is to be used.

4. Mechanical Configuration

• Mounting: Foot-mounted on rigid baseplate, coupled to motor.

• Orientation: Horizontal shaft.

• Connection: Flanged suction and discharge, same size or reduced discharge.

• Rotation: Viewed from motor end, standard clockwise rotation.

5. Performance & Testing Requirements

• Efficiency: Pump shall operate at or near its Best Efficiency Point (BEP) at specified duty.

• Testing: Hydraulic performance tested per ISO 9906 Grade 2B. Test certificate to be supplied.

• Curve: Full certified performance curve (Head vs. Flow, Efficiency vs. Flow, NPSHr vs. Flow, Power vs. Flow) to be provided.

• Noise Level: Maximum ______ dB(A) at 1 meter under design conditions.

Our Specification & Selection Support

1. Free Hydraulic Review: We verify your calculated head and flow requirements.

2. Pump Curve Analysis: We ensure the selected pump operates in the preferred operating region (70-120% of BEP flow) to avoid cavitation and excessive bearing load.

3. Alternative Proposals: We may suggest an impeller trim or different model for better efficiency or cost savings.

4. Complete Data Submission: We provide full technical submittals for approval, including:

   • Dimensional drawings

   • Performance curves

   • Material certifications

   • Motor data sheets

   • Installation and maintenance manuals

Common Specification Pitfalls to Avoid

• Oversizing: Specifying excessive head "for safety" leads to energy waste and operation far from BEP.

• Ignoring NPSH: Not verifying NPSHa > NPSHr + 0.5m safety margin risks cavitation.

• Incorrect Materials: Specifying stainless steel unnecessarily for closed, treated chilled water loops increases cost without benefit.

• Underspecified Motors: Accepting IE2 or lower efficiency classes misses significant energy savings.

Optional Features & Upgrades

• Variable Frequency Drive (VFD): For variable flow systems, with bypass and control panel.

• Advanced Monitoring: Vibration sensors, temperature probes, and smart connectivity (Modbus, BACnet).

• Spare Parts Kit: Including seals, gaskets, and wear rings.

Request a Professional Specification Review
For a no-obligation technical review of your pump requirements or to receive a detailed specification proposal:

Please provide:

1. System flow ______ m³/h @ ______ meters head.

2. Chiller make/model/capacity (for evaporator pumps).

3. Any existing pump model (if replacement).

Contact EKG (Malaysia) Sdn Bhd's engineering team. We will provide a complete, compliant pump specification and technical submittal tailored to your chilled water system.