Original Date: 05/20/2002
Revision Date: 01/18/2007
Information : Condition Based Maintenance
The Maintenance and Logistics Command-Pacific implemented Condition Based Maintenance to optimize maintenance policies for approximately two-thirds of the cutters it operates.
In 1997, when repetitive failures were observed for critical equipment, a decision was made by the Maintenance and Logistics Command-Pacific (MLCPAC) to implement Condition Based Maintenance (CBM). CBM uses analytical and empirical data gained through non-invasive inspection to plan corrective and recurring maintenance. Machinery history is used to identify causes of failure that can be prevented. MLCPAC applies the following criteria to implement CBM for equipment selection; and pressure tests, thermography, lube oil analysis and vibration analysis are used:
Critical: Failure is catastrophic
Non-Critical but Important: Failure will cause a loss in mission capability
Non-Critical: Equipment failure is acceptable
Annual visits and in-port and underway surveys are conducted to assess equipment condition. A Vibration Test and Analysis Guide (VTAG) is used during these surveys, and thermal imaging surveys are also conducted. Based on these surveys, equipment condition detail reports are prepared and repair recommendations are made. CBM Reports also include a System Assessment Summary Graph (Figure 3-1) where the following material condition assessment codes are used:
EXCL: Performance at or near design; very minor discrepancies only
GOOD: Performance below design but acceptable; minor discrepancies allowed
FAIR: Performance marginal; minor moderate repairs may be recommended
POOR: Performance unsatisfactory; major repairs and overhaul needed
OOC: Out of commission due to major discrepancies or overhaul in progress
OOS: Out of service due to support equipment problems or minor discrepancies
The use of CBM has increased machinery reliability, reduced maintenance costs, increased workforce effectiveness, avoided unnecessary maintenance, reduced Casualty Reports (CASREPs), and identified excessive and insufficient preventive maintenance actions. MLCPAC is currently moving to web-based reports with pre-generated Current Ship Maintenance Projects (CSMPs).
Figure 3-1. System Assessment Summary Graph
For more information see the
Point of Contact for this survey.