Balance Below: by Rich Merhige
Has equipment failure cost you a charter or owner’s trip? When it comes to yacht maintenance, failure to plan results in, well, failures.
The yachting world has been hesitant to adopt a predictive and preventative maintenance mindset, mostly due to preconceived notions about cost, when in reality some of the most advanced diagnostics are quite affordable thanks to new technology.
In a perfect world, machinery would be monitored continuously so any deviations from the baseline data could alert crew that they have a problem brewing. Continuous monitoring allows for early detection so conditions such as misalignment, engine misfire, or worn parts can be remedied before an unplanned outage occurs, keeping machinery running smoothly while increasing its lifespan.
Online condition monitoring is a relatively newer development in reliability-centered maintenance that allows engineers to detect irregularities in their machinery before shutdowns occur. It is the process of continuous monitoring of a machine that pulls data that can be accessed 24/7 wirelessly and is a significant component of predictive maintenance. The system will generate data at the machine’s most crucial moments and can detect changes in the machinery’s performance.
While commercial and government fleets have more familiarity with remote monitoring, these newer systems are designed to be more user-friendly and affordable for yacht owners and operators. Working smarter, not harder, is the concept. These units send data to a trusted vibration analyst who can diagnose exact problems and address the root cause.
How do online condition monitoring systems collect continuous real-time data and determine machinery health? Accelerometers are permanently affixed to the desired machinery, and cables are connected from the accelerometer to the online condition-monitoring system. A machinery database with the relevant machinery, measurement tasks and alarm levels is then created and uploaded into the online condition-monitoring system.
Vibration data is collected across all channels simultaneously (good for picking up any transient events) and transferred to the integrated yacht management system via ethernet, or to an onshore server via mobile cellular router. The real-time data can then be analyzed in two ways: on-site quick check using automated email notifications and visualization software; or remotely by a qualified vibration analyst.
Captains or chief engineers also can set up alarms to receive notifications of machinery updates on their phone or computer. Some of the more advanced analyzers on the market, using 16 or 20 measuring channels, can detect machine failures such as unbalance, misalignment, gear mesh and bearing failures. Other online condition-monitoring systems can monitor hydraulic fluid.
Online wear particle sensors are used to detect oil cleanliness. The sensor is installed upstream of the oil filter and connected to the integrated vessel management system via ethernet — it also can be paired well with the online vibration data collector. The sensor then uses eddy currents to detect wear debris from gears and bearings in the oil that passes through it. This data can then be sorted into the subsequent size and contamination level classes outlined in ISO 16232. Online condition monitoring systems can detect early signs of wear in pressurized lubricated systems.
The list of benefits of condition monitoring is extensive, and it can have an enormous impact on machinery’s productivity levels:
The newest systems on the market are a fraction of what they used to be, and are much more accurate and user-friendly. Next time an opportunity to invest in condition monitoring presents itself, don’t say “Why?” — say “Why not?”
Rich Merhige is owner of Advanced Mechanical Enterprises and Advanced Maintenance Engineering in Ft. Lauderdale (www.AMEsolutions.com). Comments are welcome below.