Start with fields that support real engineering and operating decisions:
- unique asset code;
- asset name and description;
- parent system or equipment;
- physical location;
- department or owner;
- process role and production dependency;
- upstream or downstream dependency where useful;
- utility dependency where relevant;
- manufacturer, model, and serial number where available;
- criticality;
- consequence of failure;
- key technical ratings;
- status: active, standby, out of service, or retired;
- photograph and nameplate evidence;
- manuals and drawings;
- safety or isolation references within the approved process;
- compatible critical spares;
- preventive-maintenance strategy;
- runtime or condition-data source if one exists;
- maintenance-history source if one exists;
- data owner and last verification date.
Do not turn the register into a large business-intelligence workbook too early. Add detail only when it supports work planning, inspection, spares, safety, analysis, operating consequence, or a management decision.