by not allowing an asset to reach complete end of life (catastrophic) failure, other components can be saved from complete destruction or wear.
with powerful trending techniques, defects can be detected at earlier stages of the P-F interval, thus allowing planned preventative maintenance tasks around shutdown
providing piece of mind that all of your critical assets have been checked thoroughly and reported on, providing clear communication that can give stakeholders confidence.
As a family owned business, we 'go the extra mile' for our service quality, we don't believe in compromising service quality for cost or time. Our engineers have extensive experience, and training in services offered, and our reports are tailor made for your requirements. We ensure consistency, and repeatability by having a dedicated engineer for your vibration analysis requirements, reducing the inaccuracy caused by differing measurement locations. We utilise the latest technology on the market for our services.
We believe that up to date training is extremely important to provide the best service, that's why we have an in-house ISO 18436-2 CAT IV Analyst
Most commonly performed monthly, routine monitoring is one of the most adopted forms of vibration analysis across the globe.
Why so regular?
Trending is a very powerful tool for machinery diagnostics. Although there are standards, and guidelines, each machine can run a little bit different. When the machine is a little out of the norm, these standards and guidelines may not suit that particular machine anymore.
Here at PFE Limited, we have experience with a whole host of machinery types, and we can custom program/set alarms based off your individual machines. We don't settle for broad or general alarm settings, and we look through data on every route (spectrums, waveforms, trends).
I prefer my report a certain way
We customise our reports based off your requirements, each of our customers have their own custom report format, and any time you wish to tweak or change your report, we can do that.
An ad-hoc (one-off) analysis visit may assist you to help identify what's happening.
It's usually best to pair ad-hoc analysis with regular monitoring, whether in the form of an online system, or routine monitoring. That being said, PFE are able to assist you with your diagnostic requirements.
It's a fan, it's probably imbalance?
Actually, fan units can develop a whole host of problems, in fact its quite common that we are called out to a situ balance when actually another issue is present. The 1X signal from a machine can present itself from numerous faults.
I'll just replace the bearings, then see how it is...
You can cause more problems by replacing bearings from a noisy machine, when it may be another issue altogether. Unfortunately, installation related faults are very common, and if there's nothing wrong with the bearings, it may cause further issues by replacing them prematurely.
We've already had an analyst come to site, but he said he can't read the spectrum...
Unfortunately, inexperienced and untrained analysts are very common around the industry, this means that the quality of service can vary a lot. Some machinery (such as generator sets, looking at the alternator), can produce a lot of 'rogue frequencies' or simply process related frequencies. These can be filtered out, or simply ignored and a better analysis taken place. One size certainly doesn't fit all when it comes to vibration.
Online systems can measure machines significantly more times than feasible on routine monitoring, but require significantly larger initial investment.
Wired or Wireless?
One of the most frequent questions asked in the new digital age is Wired or Wireless. PFE believe in fair, non bias comparison between technologies and manufacturers and thus we will assess the best solution for your requirements and equipment.
Wireless is a convenient solution requiring very little installation requirements, and often a lower initial investment. The result is data points often around 1-8 times a day, system dependant. This is clearly a great improvement on a data point every month, though per asset it can still take a long time for ROI when there's a lot of machines on a route. Wireless definitely has it's place in the modern IoT world with easy to use dashboards and easy to install/compact sensors.
Wireless, can struggle with variable speed machinery, with the exception of some specific equipment on the market. Even so, wireless systems to date are not capable of taking phase measurements especially across multiple sensors. Phase is an incredibly powerful tool for fault diagnostics, to be able to whittle down potential fault types.
Wired is often the most expensive, and most comprehensive solution. This is due to the installation requirements (running cables, junction boxes, power supplies, etc). Wired systems usually have significantly more flexibility with regards to sensor type, size, connectors, sensitivities, etc. They are capable of full phase analysis including cross-channel phase comparisons, which gives them extremely high fault diagnostic capabilities.
In short, there is no defining answer to whether wired or wireless is better, it depends on your requirements, equipment, and budget.
Piezo or MEMS?
The recent increase in sensor (especially wireless) technology being available has given massive rise to MEMS (micro-electrical mechanical system) sensors over the 'classic' Piezoelectrical crystal sensors. The main advantages to MEMS sensors are that they are smaller & often cheaper, thus they are used in a significant amount of wireless systems on the market. Unfortunately, there are downsides with MEMS sensors in comparison to Piezo; they typically have a worse frequency response, sampling rate, and signal-noise ratio. This means that they are not suitable for all purposes, specifically high frequency scenarios, such as high speed gearboxes.
Which part can PFE help with?
There's not always a simple solution to every issue, sometimes you require something more specialist, or perhaps your machine is something that isn't covered in the 'norm', for example, a turbine.
It's no secret that not every analyst knows how to approach turbomachinery, specifically proximity probe measurements. Using the latest technology, we can measure turbomachinery from buffered outputs, and we have great connections to help you acquire new proximity probes/protection systems,
Whether a simple, single point impact test, or a complex multipoint modal analysis, we can perform these tests and interpret the results. We also have close partners who can assist with 3D modelling, and plotting the data into ME'Scope for full FEA analysis of the complex resonant problem. This is a test that is performed when the machine is offline, and helps to determine the resonant frequencies of components.
A completely different test to Modal Analysis, ODS helps to determine the way (or shape) that a machine is moving during operation using varying amounts of measurement locations to measure phase vs vibration. This can be plotted onto a 3D model. This service is more often being superseded by MA (Motion Amplification) but there are still benefits to a physical ODS test, especially in small testing scenarios where it can in fact be quicker.