Module
Module turns up in 2 fields: refractories, gears. Here is what it means to the people in each one.
Module in refractories
Block of folded or stacked fiber blanket, compressed and fitted with anchor hardware for fast furnace lining.
A pre-engineered block of fiber, typically 300 mm square, made by folding or stacking blanket under compression and banding it around internal hardware that fastens to studs on the furnace shell. Modules are laid in parquet or soldier patterns, and when the bands are cut they expand against their neighbors to close the joints and allow for shrinkage. They let crews line large heater and furnace walls and roofs in days.
"Roof modules go in parquet pattern, cut the bands only after the whole row is tight."
Module in gears
The metric measure of gear tooth size: pitch diameter in millimeters divided by the number of teeth.
The basic size parameter of metric gearing, equal to reference pitch diameter in millimeters divided by tooth count, so a 40-tooth, 2 module gear has an 80 mm pitch diameter. Larger module means bigger, stronger teeth. Standard tooth proportions follow from it: addendum is one module and whole depth about 2.25 module. Module equals 25.4 divided by diametral pitch.
"It's a 3 module, 20 degree gear, so order the cutter by module, not by DP, or the teeth won't match."