Your Reliability Engineering Professional Development Site
A listing in reverse chronological order of these article series:
Bag house dust bag selection. The dust bags within a bag house must handle the process conditions they experience. The choice of bag materials is usually based on the cheapest fabric that will handle the conditions for a minimum of 3 to 5 years’ operation. The selection of the bag materials requires a good understanding of the process temperature, moisture content, chemical reactions with the bag fibre, dust loading effects and behaviour of the dust bags in operation. [Read more…]
One method to clean particles from a liquid or gas is to pass it through a filter. The filter is a screen that traps and holds the contaminants on its surface while allowing the fluid to twist its way past the build-up and screen. The screen can be used until the back- pressure from the collected contaminants choke it so severely that the fluid flow falls drastically. At that point the screen must be cleaned. This article explains how membrane and leaf filtration processes work and the critical factors that produce successful filtration results. [Read more…]
There has been much discussion (and often debate) around the P-F curve. The P-F curve illustrates the relationship between the warning signs that are detectable by various technology or methods and the progression of the failure. What is often not discussed and overlooked, is what happens before the equipment starts to deteriorate.
If the ultimate goal of an organization is to be proactive and ensure equipment uptime, wouldn’t the organization want to prevent the equipment from failing in the first place and not catch it after it has already started to fail? [Read more…]
In some process situations, mechanical level sensors are the best choice for the environment or are stipulated by law (as in boilers). To operate these devices requires the physical contact of the process being measured. They provide solid indisputable proof that a process condition has been achieved. Provided the mechanical mechanism is connected and working properly, these devices provide the most believable proof that a level in a vessel, tank or silo is actually what the instrument is saying it is. [Read more…]
In past articles I have often referenced Dr. Aubrey Daniels and the use of Behavioral Psychology and Analysis in the workplace. In the late 1980’s I was fortunate enough to attend a 2-week course in Performance Management put on by Dr. Daniels and two of his associates where we learned the importance of measuring behaviors as opposed to results. To say that this course was enlightening would be an understatement as it was in this class I first learned why we need to measure leading indicators as opposed to results. [Read more…]
A computerised maintenance management system (CMMS) is the maintenance department’s most important tool. It provides insight into the behaviour of the facility’s individual assets, i.e. the plant and equipment. For a CMMS to be of use it must be used as an information ‘bank’ that can be investigated. There are 9 really good reasons to use a CMMS. And each one of them alone makes a CMMS worth having. [Read more…]
When oil in gearboxes become contaminated there is a rapid loss of bearing operating life. It is critical that metal particles, dirt, sand, oxidisation products, etc be removed from the oil before they gouge and tear-up the finely toleranced machine parts. Oil replacement, contamination prevention and oil filtration are common practices religiously adopted by the best in the equipment reliability management business. This article explains the fine requirements for successful contamination control to insure long trouble- free equipment life. [Read more…]
In nearly 40 years I’ve seen it all, from those who are proud to be the best to plant sites that are in such a deplorable state, you hope you get through the tour without some type of injury, fire or explosion.
The first thing I learned when I began providing Asset Management and Reliability Centered Maintenance services as a consultant was how lucky I was to have worked my first 19 years for a company who took Employee Health, Safety and Environment seriously. In that time, I don’t remember ever wondering if the people I worked with or the Managers I worked for considered Health, Safety and Environment as the top priority. It was stated almost every day and reinforced with every job we performed through lock-out, tag-out procedures.
Steam boilers not used for power generation and of smaller size and energy output are termed packaged boilers. The heat source is usually either electric coils or a burning fuel. When a flame is used to heat the water it is known as a fired packaged boiler. Fired boilers are considered efficient steam generators with about 85% of the available energy converted to steam. They can be of water-tube or fire-tube design. Boilers incorporate many key aspects of heat transfer to create steam from water. This article describes how fired boilers work and their key components. [Read more…]
Heat is energy and its nature is to flow from a state of high excitement to one of low excitement. Heat is transferred from a hot place to a cold place by convection, conduction or radiation. This article explains the three modes of heat transfer and provides simple examples of each. Methods to reduce and increase heat transfer are also presented. [Read more…]
In continuing this year’s theme regarding common questions on relevant topics, today I have the 5 most common questions people have been asking me about the Industrial Internet of Things. Like every other article or Blog I have posted in the past I encourage you to all to jump into the conversation by asking questions or providing comments to my questions and answers. [Read more…]
The electrical conductivity (and its opposite, resistivity) of water based solutions indicate its electrical current carrying ability. High conductivity occurs when many charged atoms and ions are in the water. This typically means the presence of dissolved metals, salts, acidic or alkali chemicals. Conductivity probes are used to measure the total level of charged particles present. This article explains how conductivity probes work and their application in boiler water treatment and management. [Read more…]
When is the best time to do an RCM analysis on your equipment?
While RCM Blitz™ can be applied at any time in the asset lifecycle, the best time to do an RCM analysis is in the design phase of a capital project. Reliability Centered Design is much more than a thorough RCM analysis on a critical asset, it also uses [Read more…]
A spinning pump impeller provides the means to draw incoming product through the pump, energise it, and then force it out under pressure. The impeller coverts the electrical energy from the motor into hydraulic energy of the liquid. It does this by taking the liquid into the center of the impeller and flinging it outward at high speed. To efficiently continue to do this the impeller must remain in the same condition as it was when first installed. If the impeller deteriorates the conversion from electrical to hydraulic energy becomes inefficient. Power is wasted, flow and pressure fall and the pump cannot do its designed duty. [Read more…]
How do you decide what level and type of maintenance to use on an individual item of plant and its sub-assemblies? Not all equipment is equally important to your business. Some are critical to production and without them the process stops. Others are important and will eventually affect production if they cannot be returned to service in time. While other items of plant are not important at all and can fail and not affect production for a very long time. [Read more…]