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Engineering Notes

Technical pieces on pump component selection, materials and failure modes.

Freshly cast impellers stacked after shot blasting

2026-08-24

What Is a Pump Impeller?

The single component that converts shaft power into fluid energy — geometry, types and why the trailing edge matters.

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Sand mould block with twelve impeller cavities on the moulding line

2026-08-12

Closed vs Semi-Open Impellers: How to Choose

Efficiency, solids handling and clearance maintenance — the three trade-offs that decide the design.

White-hot iron being poured from a hand ladle

2026-07-30

CF8M or CD4MCu? Selecting Alloys for Pump Wet Ends

Chloride content, abrasion and cost drive alloy choice more than the pumped medium's name.

Flanged pump cover showing bolt holes and spigot register

2026-07-15

Why a Casting Fits or Does Not: The Interfaces That Decide

Flange face, bolt circle, spigot register and bore — the four dimensions that make a replacement casting drop in or go back in the crate.

More notes are added as questions come up in quoting. If there is something you want covered, say so in your enquiry.