Axial growth


Metal expands with an increase in temperature, and shrinks with a decrease in temperature.

A rule of thumb states that a stainless steel shaft will expand or contract 0.001 inch per inch of shaft length or diameter, for each 100°F change in temperature (0,001 millimeter per millimeter of shaft for each 50°C change in temperature).

Axial growth will affect both the open impeller to volute clearance setting and the mechanical seal face loading.

Radial growth can affect the load on both the precision bearings and the dynamic elastomer squeeze in rotating seal designs.