Not All Filters Perform the Same & It’s Important to Know Why
The above diagram shows the response difference between Nominal & Absolute Rated Filters and
the unloading seen when the DP (Differential Pressure) increases across nominal filters.
- The problem with this response is contaminants can unload downstream and without careful
monitoring, the media itself can actually migrate and cause numerous costly downstream issues from
well bore plugging in water flood operations to mechanical equipment and process problems in
- Nominal Filters have Medias which can move under increasing DP as the pore structure is not a
fixed-pore construction and subject to deformation so previously captured particles are released
downstream. This defeats many of the advantages of filtering in the first place. I have actually
taken field samples where the downstream effluent is dirtier than the influent due to unloading of
previously captured particles.
- This effect can be seen in fluctuating differential pressure readings and cycles of
increasing DP followed by a sharp decrease (Saw Type Curve) when the Media moves and unloads
contaminants. This can lead to the false impression of deceptively long filter life and the filter
- Absolute Rated Filters are manufactured differently to provide consistent performance over
the actual life of the filter with a low DP that increases gradually over time till the filter is
completely plugged and the change-out DP is reached.
- Because of the Fixed-Pore construction the pore size is not subject to change over DP
increasing and the Media Integrity is also maintained. This guarantees a consistent effluent
quality at the designated micron chosen and the efficiency is not in jeopardy during operation.
- Our unique OEM proprietary pleated design will also provide much higher dirt capacity than
Nominal type filters and ensure no quality compromise for your operational requirements.
Make Sure You Have the Right Filter for the Job
Make sure your filters are doing exactly what you want them to do for the job you need done. If you have any questions about which filters would be right for you or how the filter works. Give us a call today and our professionals will be happy to answer your questions.
NEIL RICHARDS, BSc, MPS
As an Energy Industry Professional Neil has a well-rounded knowledge of what it takes to effectively produce oil and gas to maximize the benefit. For the past 34 years working in the Oil-Patch, Safety and Environmental Protection has always been important to Neil and his associates. Neil feels Energy Companies and the Industry have come a long way to do things better and safer while continuing to contribute to a Global Economy and continues to look at the future with a positive attitude.