RCM for Gas Turbines
Specialized RCM programs for Gas Turbine Reliability & Maintenance.
Why it matters
Key Benefits
Optimized Task Selection
RCM decision logic evaluates each failure mode of gas turbines components to determine whether condition monitoring, scheduled restoration, scheduled discard, or redesign is the most effective response. This eliminates both excessive and insufficient maintenance.
Function-Focused Analysis
RCM analysis for gas turbines starts with defining operating context and required functions before identifying how those functions can fail. This ensures maintenance strategies protect the functions that matter most to production and safety.
Documented Maintenance Basis
RCM produces a living document that records why each maintenance task for gas turbines exists and what failure mode it addresses. This documentation prevents well-intentioned but misguided changes to maintenance programs over time.
Context
Challenge & Approach
The Reliability Challenge
Gas turbine OEM maintenance intervals are based on a combination of fired hours and starts using equivalent operating hour (EOH) calculations — the RCM analysis evaluates whether site-specific factors (fuel quality, inlet air conditions, load profile, start type) warrant adjustment of these intervals. Combustion hardware failure modes (liner cracking, transition piece distortion, fuel nozzle coking) have different progression rates by unit model and fuel type, and the analysis must determine whether borescope inspection intervals provide adequate detection lead time. Hot gas path coating degradation (TBC spallation, oxidation) is detectable through borescope inspection, but the P-F interval varies significantly with firing temperature and fuel contaminants. Compressor fouling affects performance and surge margin — the analysis evaluates whether performance-based online/offline wash scheduling is more effective than fixed intervals. Protective system hidden failures (flame detector degradation, exhaust thermocouple drift, vibration sensor calibration drift) require failure-finding task intervals based on SIL and consequence analysis.
Our Approach
We conduct the RCM analysis with gas turbine operations, maintenance, controls, and engineering personnel. Functions are defined with quantified performance standards (output, heat rate, exhaust temperature limits, emissions compliance). Failure modes are cataloged by section: compressor (blade fouling, erosion, FOD, stall/surge), combustion (liner crack initiation and propagation, crossfire tube erosion, fuel nozzle flow imbalance), hot gas path (blade creep extension, coating loss, platform oxidation, shroud wear), bearings and seals (Babbitt fatigue, oil contamination, seal wear), and protective systems. The JA1011 decision logic determines: performance monitoring as an on-condition task for compressor fouling (triggering wash events), borescope inspection at defined EOH intervals for combustion and HPT components with go/no-go criteria, vibration monitoring for bearing condition, exhaust temperature spread analysis for combustion system health, and failure-finding tasks for SIL-rated protective functions. We document where OEM intervals are validated, where they can be extended based on operating data, and where additional tasks are required to close detection gaps.
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Learn More →RCM for gas turbines follows a structured decision process that defines operating context, identifies functions and functional failures, lists failure modes and effects for the compressor blades, combustion liners, turbine nozzles, bearings, and fuel system, then applies decision logic to select the most effective maintenance task for each mode. Tasks are classified as condition-directed, time-directed, or failure-finding, with redesign considered when no maintenance task is effective.
Traditional PM for gas turbines typically follows OEM time-based intervals regardless of failure patterns. RCM analyzes whether each failure mode is age-related or random, then selects the task type accordingly. This often results in replacing many time-based tasks with condition monitoring while adding targeted inspections for failure modes that the original PM program did not address.
A full classical RCM analysis for a fleet of gas turbines typically requires 30 to 60 hours of facilitated team sessions depending on equipment complexity. Streamlined RCM approaches can reduce this to 15 to 25 hours by focusing on high-criticality failure modes. The analysis team should include operations, maintenance, and engineering personnel with direct experience on gas turbines.
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