Prognost Reciprocating Machinery Protection

PROGNOST provides machinery protection and condition monitoring technologies for critical rotating equipment, with specialized capabilities for reciprocating machinery such as compressors. Its portfolio supports applications ranging from safety-related machine protection to condition monitoring and diagnostics. For industrial operations, these technologies can help protect critical assets, improve visibility into equipment condition, and support reliability and maintenance decisions. The appropriate approach depends on machine type, criticality, failure modes, existing instrumentation, and the level of diagnostic insight required.

Reciprocating machinery has dynamic behaviour that differs from conventional rotating equipment, so traditional overall vibration measurements may not adequately represent every mechanical condition or failure mode. Compressors, for example, experience changing forces and vibration throughout each crankshaft revolution. Specialized monitoring can evaluate measurements in relation to crank angle and incorporate parameters such as crosshead vibration and piston rod position. Reliability teams should match monitoring techniques to credible failure modes rather than relying on a single measurement for machine protection.

Segmented vibration analysis evaluates vibration during specific portions of a reciprocating machine’s revolution rather than relying only on an overall vibration value. This helps distinguish mechanical events that occur at particular crank-angle positions. PROGNOST-SILver, for example, divides a 360-degree revolution into 36 segments of 10 degrees for its segmented vibration analysis. The technique can provide more meaningful protection information when assessing crosshead and other vibration behaviour on reciprocating compressors.

Reciprocating compressor protection can incorporate several measurements depending on the machine design and credible failure modes. These can include crosshead vibration or acceleration, piston rod position, cylinder vibration, pressure, speed or phase reference, and other relevant machinery signals. Combining appropriate measurements can provide better coverage than relying on overall frame vibration alone. The protection strategy should begin by mapping important mechanical failure modes to suitable sensors, measurements, alarm limits, and shutdown functions.

Piston rod position monitoring provides information about rod movement that can help identify changes in the mechanical condition of reciprocating compressors. Depending on the monitoring approach, rod position measurements can complement vibration data and support assessment of components such as piston rods, packing, crosshead connections, and rider rings. Because operating conditions and compressor geometry influence these measurements, appropriate sensor installation, baseline behaviour, alarm criteria, and interpretation are important when incorporating rod position into a reliability or machinery protection strategy.

Yes. PROGNOST machinery monitoring can be incorporated into industrial environments where process control, safety, and machinery protection systems already exist. The specific integration architecture depends on the selected PROGNOST technology, available instrumentation, protection requirements, and existing operational technology infrastructure. For brownfield projects, teams should document current sensors, signals, shutdown logic, system interfaces, communications, and cybersecurity requirements before determining how new machinery protection or condition monitoring should connect with the existing environment.

Specialized machinery protection can help create more meaningful alarm and shutdown logic by evaluating signals in the context of how reciprocating equipment actually operates. Because vibration changes throughout a compressor’s operating cycle, machine-specific analysis can provide better context than applying a general vibration limit alone. However, nuisance-trip performance also depends on sensor selection and installation, alarm configuration, process conditions, commissioning, and maintenance. Protection settings should therefore be engineered and validated for the individual compressor and its operating environment.

Spartan Controls supports compressor and engine applications across reliability, controls, performance, emissions, and regulatory compliance. Services include vibration and condition monitoring, compressor performance analysis, tuning and PID optimization, control-system troubleshooting, commissioning and startup support, and reliability consulting. Spartan also provides emissions testing and program management, including MSAPR performance testing, emissions checks, engine fleet analysis, methane slip testing, and compliance reporting. Together, these capabilities can help operators connect compressor reliability and asset performance with emissions and compliance requirements.