Building a spare parts list that survives an emergency
A list of model codes is not a spare plan. Four fields make it usable when a line stops.
Most spare lists are a column of model codes. Enough to reorder, not enough to act at 2 a.m.
Record the mounting, not just the model
Thread, insertion depth and clearance. Without them the replacement arrives and does not fit the bracket.
Record the function
Write “dosing pump outlet, 0–1.6 MPa” next to the code. Six months later nobody remembers which line the spare belongs to.
Record the revision
A batch or date tells you whether the spare matches the unit in service after a supplier changes a component.
Write the replacement rule
“Replace when zero drift exceeds 0.5% FS” is a rule. “Replace when it looks bad” is a guess.