Page 83 - Oil and Gas Production Handbook An Introduction to Oil and Gas Production

Maintenance Management
Asset ERP-System
Condition Create work order
Document Work order history
MMS
C
Messenger CMMS* * Maintenance status
Preventive maintenance,…
Asset Monitor
Operator Service staff
extern

Diagnosis
and
Status Data

Actuator/
Valve Heat Exchanger

Maximize the utilization of
plant assets over their lifecycle
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, for which that corrosion may be metered), tension force
meters and free swinging strings. These statistics are logged to a central
structure condition monitoring system, to portray 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 which 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
numerical or computed variables interpreted to trigger a maintenance
request. A Work Order Procedure is then automatically initiated in the
CMMS.

81