Protecting Lubricants in Standby and Intermittent Service

Greg Livingstone (Fluitec) & Vanda Franco (Petrotec)

A Technical Guide for Reliability Engineers Managing Turbines, Compressors, and Gearboxes through Extended Idle Periods

Supply chain disruption, demand volatility, and grid-balancing requirements have changed how critical rotating equipment operates. Assets that ran continuously a decade ago now sit in standby for weeks at a time.

Gas turbines that once carried base load now run as peakers. Spare compressors at petrochemical sites are kept warm but rarely loaded. Seal oil systems on idle FPSO trains and standby pumps continue to circulate through coolers, bearings, and seals on weekly or monthly cycles.

The asset is available. The lubricant, however, is operating in a regime it was never formulated for. This shift has exposed a gap in conventional thinking about lubricant management. Reliability teams know how to manage continuous service. They know how to lay up an asset for long-term storage.

The middle ground, where the asset cycles intermittently, and the oil circulates through the full system on each run, is where most operators are losing ground. Antioxidants deplete faster than expected. Varnish appears in systems that had clean oil six months earlier. Bearing temperatures creep up. Servo valves stick on the first start after a long idle period.

The root cause is not the equipment or the oil, but the operating profile. The systems we are addressing share a specific duty cycle.

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