Maintenance & Reliability
HP Reliability: Avoiding electrical damage to bearings
Major machinery often suffers bearing damage due to shaft currents. Common sources of shaft currents are electromagnetic, static charge buildup and electrical equipment related. Such damage can appear..
HP Reliability: Consider retrofit-free bearing upgrades for your pumps
Next to mechanical seals, rolling element bearings are the components that fail most frequently in centrifugal pumps. There are many reasons for these failures. Previous columns have highlighted remed..
Reduce corrosion in amine gas absorption columns
Polymer coating systems provide barriers to protect vital plant equipment against stress-corrosion cracking
HP Reliability: Consider third-party inspection
The HPI, as a provider of quality services and products, would like to receive guaranteed quality from its suppliers. Unfortunately, having set high standards for ourselves does not guarantee that oth..
HP Reliability: Pursue a comprehensive infrared condition monitoring strategy
The best reliability-based condition monitoring programs begin small and expand as needed to cover the plant thoroughly. A thermography program normally begins with the electrical system. This applica..
HP Reliability: Consider reliability-focused maintenance
Reliability professionals attending one of HP's recent International Process Plant Reliability Conferences were briefed on the improvement approach taken by a large U.S. organization. This forward-loo..
HP Reliability: Publish or perish – a reminder to industry
A number of useful textbooks dealing with machinery reliability and dozens of technical papers dealing with related subjects owe their existence to an interesting policy. Twenty-one years ago, one of ..
HP Reliability: Closed-loop oil mist systems are a viable lubrication option
Although plantwide, centralized oil mist systems have served industry well since the early 1960s, closed-loop oil mist systems have made major inroads only in this decade. Environmentally-acceptable a..
HP Reliability: Reliability growth models for process plants
Failure data are used to build simple log-log plots for predicting future failures and identifying if failure trends are improving or deteriorating. On the Crow/ AMSAA plot (Fig. 1), stable processes ..
HP Reliability: How installation and operation influence MTBF
Mean-time-between and mean-time-to-failure (MTBF and MTTF) can differ for the same equipment. The differences are often attributable to quality of installation and grade of operation. This situation i..
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