Centrifugal Pump Datasheet - Key Parameters Reference

1. Datasheet Overview

1.1 Purpose and Structure

1.2 API 610 12th Edition Datasheet Changes

2. General Information Section

2.1 Equipment Identification

2.2 Equipment Arrangement

3. Operating Conditions

3.1 Flow Rate Parameters

Flow Margin Guidelines:

Process flow variation: ±10%
Instrument uncertainty: ±2%
Future capacity: +10-20%

Recommended:
  Q_rated = Q_normal × 1.10 to 1.15

3.2 Head Parameters

Total Dynamic Head Calculation:

TDH = H_static + H_friction + H_pressure

Where:
  H_static = Z_discharge - Z_suction (m)
  H_friction = Head loss in piping (m)
  H_pressure = (P_d - P_s) / (ρ × g) (m)

Example:
  H_static = 25 m (tank elevation difference)
  H_friction = 15 m (at rated flow)
  H_pressure = (2 bar - 1 bar) / (1000 × 9.81) × 100000 = 10.2 m
  TDH = 25 + 15 + 10.2 = 50.2 m

3.3 Pressure Parameters

Design Pressure Selection:

3.4 Temperature Parameters

Temperature Impact on Design:

4. NPSH Data

4.1 NPSH Parameters

4.2 NPSHa Calculation

NPSHa = (P_s - P_v) × 10.2 / SG + h_s - h_f

Where:
  P_s = Suction pressure (bara)
  P_v = Vapor pressure at pumping temperature (bara)
  SG = Specific gravity
  h_s = Static head to pump centerline (m, positive if below liquid)
  h_f = Friction losses in suction piping (m)

Example (Atmospheric tank):
  P_s = 1.013 bara
  P_v = 0.074 bara (water at 40°C)
  SG = 1.0
  h_s = 5 m (liquid above pump)
  h_f = 0.5 m

  NPSHa = (1.013 - 0.074) × 10.2 / 1.0 + 5 - 0.5 = 14.1 m

4.3 NPSH Margin Requirements

Example:

If NPSHr = 4.0 m:
  API 610 margin = MAX(1.0, 0.3 × 4.0) = MAX(1.0, 1.2) = 1.2 m
  Minimum NPSHa = 4.0 + 1.2 = 5.2 m

5. Liquid Properties

5.1 Required Properties

5.2 Viscosity Impact on Performance

5.3 Corrosive/Hazardous Properties

6. Construction Data

6.1 Pump Type Selection

6.2 Material Classes

6.3 Material Selection Guide

7. Mechanical Seal Data

7.1 Seal Selection Parameters

7.2 API 682 Arrangement Selection

7.3 Common Flush Plans

7.4 Seal Face Material Selection

8. Driver Data

8.1 Electric Motor Parameters

8.2 Motor Sizing

Motor Power Calculation:
  P_motor ≥ P_rated / η_pump × SF

Where:
  P_rated = Q × H × ρ × g / (3.6 × 10⁶) (kW)
  η_pump = Pump efficiency at rated point
  SF = Service factor (1.10-1.25)

Example:
  Q = 500 m³/h, H = 80 m, ρ = 1000 kg/m³
  P_hydraulic = 500 × 80 × 1000 × 9.81 / (3.6 × 10⁶) = 109 kW
  η_pump = 0.75
  P_shaft = 109 / 0.75 = 145 kW
  P_motor = 145 × 1.15 = 167 kW → Select 185 kW motor

8.3 Hazardous Area Classification

9. Instrumentation Requirements

9.1 Standard Instrumentation

9.2 Additional Instrumentation (Critical Service)

10. API 610 12th Edition - Five Operating Points

10.1 Operating Point Definitions

10.2 Example Multi-Point Datasheet

11. Datasheet Review Checklist

11.1 Before Issuing to Vendors

11.2 When Reviewing Vendor Response

12. Vendor Data Requirements

12.1 Mandatory Vendor Information

Vendor MUST provide the following data in their quotation/proposal:

Performance Data (Per Operating Point)

Impeller and Hydraulic Data

Mechanical/Construction Data

Mechanical Seal Data

Motor/Driver Data

12.2 Vendor Drawings Required

12.3 Vendor Curves Required

12.4 Vendor Test Data Required

12.5 Vendor Deviation Statement

Vendor MUST clearly state any deviations from specification:

Important: Vendors must provide deviation list even if “No Deviations” - explicit statement required.

13. Quick Reference Tables

13.1 Typical Margins

13.2 Unit Conversions

References

• API 610 12th Edition - Centrifugal Pumps
• API 682 4th Edition - Shaft Sealing Systems
• IOGP S-615 - Supplementary Specification to API 610
• Hydraulic Institute Standards