Step 2: Suction Conditions & NPSH Evaluation

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(Prevent cavitation)

Required Data

Suction source (tank, pit, pipeline)
Liquid level (minimum / normal / maximum)
Suction pressure
Suction linesize & length
NPSHa (Available)

Vendor Requirement

NPSHr at rated point
Minimum NPSH margin (API 610 recommended)

NPSHa must always be greater than NPSHr.

Step 1: Define Process Requirements
(Define what the pump must do)Required DataFlow rate (m³/h or GPM)Total Dyn.....
Step 3: Select Pump Type (API 610 Classification)
Selection GuideOH Pump → General service, moderate pressureBB Pump → H.....
Step 5: Mechanical Seal & Sealing System
(Safety and reliability)Required DataFluid toxicity/ flammabilityTemperature and.....
Step 6: Driver Selection (Motor / Turbine)
Required DataRequired power (kW)Voltage / frequencyArea classification (ATEX / h.....
Step 7: Pump Curve & Operating Point Check
(Avoid hydraulic problems)Required DataPump performance curveBest Efficiency Poi.....
Step 8: Standards & Compliance
Required StandardsAPI 610API 682 (seals)ISO / ASME (if applicable)DocumentationD.....
Step 9: Vendor Evaluation & Technical Clarification
Evaluation CriteriaCompliance with datasheetDeviation listPast referencesLead ti.....
Step 10: Final Purchase & Inspection
Required ActionsTechnical approvalFactory Acceptance Test (FAT)Inspection planPr.....