Up Time Magazine- April/May 2008 - (Page 19) SSC Critical Crane RCM Pilot Project 480 AC Crane Control S/S 4 SIG Hoist S/S 1 (Up and Down Axis) N-S Motion Bridge S/S (N.S. Axis) 3 Trolley S/S E-W Motion STRUCT CONNECT SIG 480 AC assigned applicable and effective PM tasks and non-critical failure modes were given a formal Sanity Check to evaluate whether they could be Run-ToFailure (Step 7). 2 Managing your weight just got easier. The results of this analysis are sumCONNECT marized in Figure 3, the Systems Analysis Profile. Z MOTION The detail that was achieved by the team is reflected Figure 2 - Functional Block Diagram, Step 3-2 in the large number of individual discussion including a fully developed examcomponents and the analyzed failure modes ple and a review of seven actual case studies (45 and 137, respectively). It is especially imis given in Reference 1. This article reports portant to note that 9 out of every 10 failure on the results of Steps 1 to 7, the Systems modes were critical from either a safety and/ Analysis portion of the process. or outage point of view. Thus, a focused PM program becomes very necessary to mitigate AMS has achieved success with Classical safety risks and preserve the crane availabilRCM over the past 25 years by using a team ity for use and reliability for actual operation. approach to the analysis. Specifically these Notice also that 1 in 6 failure modes are hidteams must be composed of craft technicians den from the operator and pose a special risk and engineering specialists who operate and concern if not properly treated. perform the hands on maintenance of the STRUCT (E.W. Axis) Trico’s High-Viscosity Gear & Lube Oil Portable Filter Cart up to 10,000 SUS selected equipment/systems plus a facilitator who is an expert in the application of the RCM methodology. This approach was followed here, and once again proved to be the right combination to produce a significant amount of new information to upgrade not only the PM program content, but also a series of new inputs to the design standard and operating procedures. The analysis was done by dividing the Crane System into four Subsystems as shown in Figure 2. The lines between the subsystems indicate the functional in/out interfaces where the out interfaces define the Subsystem functions to be preserved (Step 4). A Failure Mode and Effects Analysis was then performed on the components in each Subsystem to pinpoint exactly what failure modes could potentially produce a Functional Failure (Step 5). Each failure mode was then put through the Logic (Decision) Tree Analysis (Step 6) to assign a specific level of criticality; including hidden if applicable. Finally, critical failure modes were www.uptimemagazine.com RCM Program Results Figure 3 identified 168 PM Task Decisions and we will now discuss the specifics of those decisions. An important part of this discussion includes a comparison between the RCM-based PM tasks and the conventional (pre-RCM) tasks. Since the crane used in the Pilot study is a new installation, a formalized conventional PM program had Introducing the Industrial Gear and Lube Oil Filtration System from Trico designed specifically for higher viscosity fluids. This recently released product features a substantial viscosity capability of 2000 cSt @ 40oC, making it one of the most versatile filtration systems available. • Conditions lubricants in use • Filters new oil before putting into service • Complements existing system filtration as part of a preventative maintenance program • Transfers new fluids from drums to storage tanks or system reservoirs ELIMINATE YOUR WEIGHT WATCHING WORRIES. CALL TRICO. SSC Critical Crane RCM Pilot Project Systems Analysis Profile Number of Subsystems (1) Hoist, (2) Trolley, (3) Bridge, (4) Controls Number of Subsystem Functions Number of Subsystem Functional Failures Number of Subsystem Components Number of Failure Modes Analyzed - Number of Critical Failure Modes (91%) - Number of Hidden Failure Modes (16%) Number of PM Task Decisions Made (Includes Run to Failure) 4 10 26 45 137 125 22 168 Figure 3 - System Analysis Profile www.tricocorp.com 800-558-7008 61 http://www.tricocorp.com http://www.uptimemagazine.com
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