Selection, Sizing and Design
of Pumps
Overview
Dynamic Pumps
• Centrifugal
• Flow
• Axial
• Mixed Flow
• Radial
• Suction
• Single Suction
• Double Suction
• Construction
• Impeller Design
• Bearing Arrangement
• Volute or Diffuser
• Vertical
Displacement Pumps
• Reciprocating
• Plunger/Piston
• Direct Acting
• Power Pump
• Diaphragm
• Pneumatic
• Mechanical
• Rotary
•
•
•
•
Gear
Lobe
Screw
Progressing Cavity
Dynamic Pumps
• Constant Head Machine
• Dynamic pumps add energy to the
working fluid in the form of
velocity
• The fluid velocity is then
converted to pressure by
slowing through a
volute/diffuser
• Bernoulli’s Principle:
Displacement Pumps
• Constant Flow Machine
• Displacement pumps simply move
fluid, increasing pressure by forcing
the fluid against a resistance
• Flowrate is proportional to speed
and stroke length
• Flowrate is irrespective of
discharge pressure - will pump
until failure
Initial Selection
• GPSA Fig 12-3
• Very preliminary
• Outdated
• Doesn’t cover a number of pumps
• Requirements
• Varying flow?
• Varying pressure?
• Metered flow?
• Fluid properties
•
•
•
•
Viscosity
Multi-phase
Lubricity
Slurry/Emulsion/Solids
Initial Selection
Repsol Pump Selection Guide – 20-00153DC
Centrifugal Pumps
• ANSI / ISO
• ANSI B73.1 (Horizontal, 2012), B73.2 (Vertical, 2016), B73.3 (Sealless, 2015)
• Defines standard design dimensions
•
•
•
•
Footprint
Nozzle centerlines
Shaft size
Baseplates
• Foot-mounted
Installation considerations
• Grouted vs non-grouted
• Mounting feet, pads
• Quality checks prior to
installation and shipment
(planarity, surface, prealignment)
Commissioning Support
• Installation practice (API 686)
• Seal system setup and charging
• Baseline vibration
• Cold vs hot alignment
• Pipe strain