Oil and gas production handbook An introduction to oil ... - ABB Group

Messenger
Asset
Condition
Document
ERP-System
CMMS*
Maintenance Management
Create work order
Work order history
Maintenance status
Preventive maintenance,…
Operator
Asset Monitor
Service staff
extern
Diagnosis
and
Status Data
Actuator/
Valve
Heat Exchanger
Maximize the utilization of
plant assets over their lifecycle
Figure 34. Computerized maintenance management system
Condition monitoring includes both structural monitoring and condition
monitoring for process equipment such as valves and rotating machinery.
For structural monitoring, the devices are corrosion meters (essentially
plates that corrode, so that corrosion may be metered), tension force meters
and free swinging strings. These statistics are logged to a central structure
condition monitoring system, to show what forces are acting against the
installation, and the effect those forces are having.
Condition monitoring of machinery is generally used for large rotating
apparatus, such as turbines, compressors, generators and large pumps.
Input devices are vibration meters, temperature (bearing, exhaust gases,
etc.), as well as the number of start/stops, running time, lubrication intervals
and over-current trip-outs. For other process equipment, such as valves, the
system can register closing times, flow and torque. A valve that exhibits a
negative trend in closing time or torque ("stiction") can be diagnosed. The
maintenance trigger is the mechanism whereby field device or equipment
monitor resident information, in the form of digital status signals or other
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