Effective Maintenance: The Key to Profitability
Today maintenance is recognized as a contributor to company competitiveness, playing a fundamental role in the control of total equipment costs, quality and delivery times for products and services.
The operating condition and therefore the performance of a production unit are both directly linked to the effectiveness of equipment maintenance. In the case of predictive maintenance, deterioration is detected and monitored during the working life of machines and parts so as to anticipate any fault in time.
Any factory would love to be able to increase its efficiency and avoid spending a fortune on repairs. Fortunately, ultrasound testing has the benefit of being fast, non-intrusive and predictive. When used as a first step for predictive maintenance on all of your plant’s assets, the technology can provide valuable insight about where a problem is occurring. While ultrasound leak detection is an excellent way to determine where a plant is losing steam or compressed air, its ability to supply predictive maintenance is of equal value. Problems within machinery do come out of nowhere, although there is usually a long period of degradation before a malfunction becomes rampant. As a component deteriorates, its performance declines, creating inefficiencies and unexpected costs. Therefore, it is not enough to resolve an issue once it becomes evident, because the machinery loses operating efficiency long before that.
A substantial body of literature has been accumulated on the advantages of using ultrasound in partnership with other predictive maintenance techniques to uncover performance trends. As there are success stories about the ways ultrasound has helped companies save money and increase plant efficiency, as well as ultrasound uses that apply to manufacturing plants of any variety.
Ultrasound probing lets the user hear inside a machine, which provides an understanding of a piece of equipment that a visual inspection does not.
The simplicity and speed of ultrasonic testing as performed by the experienced ultrasonics technician allows many plants to run multiple diagnostics checks per year on their entire infrastructure. Some companies run a check on all of their hundreds or thousands of pieces of equipment twice per year. Then, if one component indicates noise inconsistent with the norm, they can use further condition monitoring to determine the specific issue.
The ability to run multiple checks per year on all or most of a plant’s equipment will also let factory managers track and log trends so they can successfully predict when components will wear out, rather than reacting to issues once they’ve become evident later along the P-F curve. Also units and parts can stay in use longer as ultrasound is quick and non-intrusive so it doesn’t require any dismantling of machinery. Additionally, the need for major repairs is prevented, allowing installations to run productively year-round. And because managers will know exactly which parts are needed and when, they can keep inventory to a minimum and save money and space.
The present age points towards the growing necessity of structured survey techniques for most systems, mainly when it comes to high voltage machineries and electrical equipment. In order to keep a constant track of the condition of valuable electrical assets, timely surveys and inspections is imperative. The information drawn from these survey reports is used to prioritize replacement and maintenance activities, which eventually reduces outages, as well as operation costs. It also increases factors like safety, durability, and reliability of the particular equipment.
Collecting data trends is an essential part of the implementation of a good predictive maintenance system. Over the course of a few years, a plant manager should have a firm grasp on some emerging patterns in their equipment. Some parts will show corrosion or damage after certain time intervals, so repairs can be made before it gets out of control.
What Is Ultrasound
Technically, ultrasounds are sounds that cannot be heard by the human ear. In other words, sounds with a frequency above 20 kHz. Ultrasounds have a number of specific characteristics that make them useful in industrial applications.
Ultrasounds can be very precisely measured. Differences in intensity as the waves travel through a medium or body can be quantified. Various phenomena that can adversely influence the operation and quality of machines and systems can be clearly identified often without interrupting their operation.
High frequency sounds are also more directional than lower frequency. This makes it easier to pinpoint the source with precision even in the presence of other background noise.
Another major benefit of ultrasounds is the sheer number of issues that produce them. Leaks, stress, electrical discharges, cavitations (the appearance of cavities filled with damp and gas) in flowing liquids, turbulence in flowing gas or liquids; each emits ultrasounds that can be detected and measured.
How Ultrasound Inspections Work
Ultrasonic testing is a very versatile inspection method, and inspections can be accomplished in a number of different ways.
Most problems occurring in machines and electrical equipment produce sound and vibration at ultrasonic frequencies (greater than 20kHz) that cannot be detected by the human ear. Now, these ultrasonic sounds emitted from the faulty mechanical or electrical devices are detected by ultrasonic survey instruments used by the technology. The method allows the engineers to detect faults or loopholes in high voltage equipment and machineries, which cannot be identified by either vibration tests or infrared surveys.
The ultrasonic survey probe senses high frequency sounds produced by operating equipment leaks and electrical discharges. It electronically translates these signals by heterodyning them down into the audible range so that a user can hear these sounds through a headset and see them as intensity increments on a display so that they are easily recognized and understood.
Ultrasonic leak detection survey is extremely broad based. Sensing ultrasounds generated by a leak, the ultrasonic survey probe can be used to locate leaks in pressurized systems regardless of the type of gas used. This is especially beneficial in areas where there is a saturation of gases or where a wide variety of gases, pressurized vessels and vacuum processes exist.
Ultrasonic survey probes can also be used to detect flow turbulence problems that occur in fluid power, water or steam systems. Identification of a problem will then involve the replacing of defective parts or redesigning a system
Ultrasound surveys can assist thermography on high voltage systems as they are able to detect discharges that occur due to air being ionized either through defective connections, defective contacts or loading.
Time and convenience are also improved with ultrasonic detection since equipment may be tested while on-line.
Ultrasonic detection is now recognized to be a decisive strategic priority. It enables you to achieve major savings through the elimination of huge wastage. It avoids numerous unexpected incidents which are usually very costly. It also contributes to the improvement of the quality of your production as well as output and it provides you with the most complete response to a wide range of maintenance operations.
Ultrasonic technology provides the most precise and cost effective solutions in the following areas:
As it is thermography, ultrasound inspection itself is an interpretive skill, and should be performed by someone who is qualified and experienced. There are ultrasonic testing equipment manufacturers who virtually insist that “anybody can do it”, prompting factory managers to acquaint themselves with different sounds, after purchasing of course their equipment. It takes only a false positive decision to stop production in order to have the ‘faulty’ piece of equipment replaced or repaired only to find out, in your chagrin, that you weren’t so lucky this time. In all fairness, let’s say it could happen even to a well seasoned ultrasonics technician (not a chance!) but, it would be their responsibility, not yours.
Conclusions
Today maintenance is recognized as a contributor to company profitability and competitiveness, playing a fundamental role in the control of total equipment costs, quality and delivery times for products and services.
Ultimately, the best way to keep operations running smoothly and efficiently is by taking action before a problem arises or a mechanical failure occurs. By taking a proactive approach and using some of the techniques outlined, plants can maximize their potential and minimize their maintenance expenses.
With that said, ultrasound inspection is a good place to start.