--- title: Donaldson Hy-Pro Lube & Hydraulic Filtration Industry Blog | case study description: case study | Learn about hydraulic fluid, lube oil, diesel fuel and industrial fluid contamination, filtration and conditioning on the Donaldson Hy-Pro blog. --- [![Donaldson Hy-Pro Logo_White](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo_White.png?width=591&height=265&name=Donaldson%20Hy-Pro%20Logo_White.png) ![Donaldson Hy-Pro Logo 2](https://www.hyprofiltration.com/hs-fs/hubfs/Hy-Pro%20Logos/Donaldson%20Hy-Pro%20Logo%202.png?width=584&height=262&name=Donaldson%20Hy-Pro%20Logo%202.png) ](https://www.hyprofiltration.com) [**](https://www.hyprofiltration.com/blog/topic/case-study#tmpmodule_1568675152246189) [![Distributors](https://no-cache.hubspot.com/cta/default/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4.png)](https://cta-redirect.hubspot.com/cta/redirect/170326/6a993b6f-f737-4a22-8a35-a45c4da5c3b4) ![ECATALOG](https://no-cache.hubspot.com/cta/default/170326/interactive-162302555948.png) ** ###### 2 min read ### [Copper Mine Achieves Amazing Results with Donaldson Hy-Pro](https://www.hyprofiltration.com/blog/copperminecasestudy) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Jul. 23, 2024 [![Copper Mine Promo for Email (9)](https://www.hyprofiltration.com/hs-fs/hubfs/Copper%20Mine%20Promo%20for%20Email%20(9).png?width=750&height=288&name=Copper%20Mine%20Promo%20for%20Email%20(9).png)](https://www.hyprofiltration.com/hy-pro-increased-papermill-filter-lifespan-case-study) ##### A new case study is available now! ###### Topics: [ISO Fluid Cleanliness Codes](https://www.hyprofiltration.com/blog/topic/iso-fluid-cleanliness-codes) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [cutdirtcutcosts](https://www.hyprofiltration.com/blog/topic/cutdirtcutcosts) [cleanoil](https://www.hyprofiltration.com/blog/topic/cleanoil) [Copper Mine](https://www.hyprofiltration.com/blog/topic/copper-mine) ###### 3 min read ### [Hy-Pro Filtration Helps Paper Mill Achieve 75% Cleaner Oil](https://www.hyprofiltration.com/blog/papermillcasestudy) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Dec. 05, 2023 [![META IMAGE case study](https://www.hyprofiltration.com/hs-fs/hubfs/META%20IMAGE%20case%20study.gif?width=739&height=283&name=META%20IMAGE%20case%20study.gif)](https://www.hyprofiltration.com/hy-pro-increased-papermill-filter-lifespan-case-study) ##### A new case study is available now! ##### With the help of Hy-Pro Filtration, a U.S. Paper Mill was able to achieve 75% cleaner oil.  ###### Topics: [ISO Fluid Cleanliness Codes](https://www.hyprofiltration.com/blog/topic/iso-fluid-cleanliness-codes) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [paper mill](https://www.hyprofiltration.com/blog/topic/paper-mill) [cutdirtcutcosts](https://www.hyprofiltration.com/blog/topic/cutdirtcutcosts) [cleanoil](https://www.hyprofiltration.com/blog/topic/cleanoil) ###### 3 min read ### [DFE: Testing Filters Under Real-Life Conditions (Part 4 of 4)](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-4-of-4) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Jul. 18, 2017 [![](https://www.hyprofiltration.com/hubfs/images/DFE/Fig2.jpg) ](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-4-of-4) Throughout the first three entries in this series (find parts [one](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-1-of-4), [two](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-2-of-4) and [three](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-3-of-4)), we've discussed the difference in two filter element testing methods, ISO16889 and DFE. We've also illustrated how many elements fall short of their stated beta ratio under dynamic flow conditions. Today we'll wrap it up with simulated cold-start tests. ## DFE Multi-Pass: Cold Start Contamination Retention Once the element has captured enough contaminant to reach approximately 90% of the terminal [ΔP](https://www.hyprofiltration.com/blog/bid/358065/filter-sizing-calculating-clean-element-dp) (dirty filter indicator setting), the main flow goes to zero and the injection system is turned off for a short dwell period. Then the main flow goes to maximum element rated flow accompanied by real-time particle count to measure retention efficiency of the contaminant loaded element. The dynamic duty cycle is repeated to further monitor the retention efficiency of the filter element after a restart. ###### Topics: [ISO 16889](https://www.hyprofiltration.com/blog/topic/iso-16889) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [filter performance](https://www.hyprofiltration.com/blog/topic/filter-performance) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) ###### 4 min read ### [DFE: Testing Filters Under Real-Life Conditions (Part 3 of 4)](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-3-of-4) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Jul. 11, 2017 [![](https://www.hyprofiltration.com/hubfs/images/DFE/Fig1.jpg) ](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-3-of-4) Last week we covered the differences between the ISO16889 Filter Test Procedure and the DFE Filter Test Procedure. This week we illustrate the difference between elements engineered to retain particles during dynamic flow conditions and those that are engineered only to pass the ISO16889 test. (Looking for previous posts? Find parts [one](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-1-of-4), [two](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-2-of-4) and [four](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-4-of-4).) ###### Topics: [ISO 16889](https://www.hyprofiltration.com/blog/topic/iso-16889) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [filter performance](https://www.hyprofiltration.com/blog/topic/filter-performance) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) ###### 2 min read ### [DFE: Testing Filters Under Real-Life Conditions (Part 2 of 4)](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-2-of-4) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Jun. 27, 2017 [![](https://www.hyprofiltration.com/hubfs/images/DFE/Fig1.jpg) ](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-2-of-4) Last week, in part [one](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-1-of-4), we briefly discussed how filter elements are rated by manufacturers. This week we're discussing the industry standard ISO16889 multi-pass test and Hy-Pro's standard, the DFE test. (Already read part two? Read parts [three](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-3-of-4) and [four](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-4-of-4).) ## Current Filter Performance Testing Methods To understand the need for DFE, it is important to understand how filters are currently tested and validated. Manufacturers use the industry standard ISO16889 multi-pass test to rate filter efficiency and dirt-holding capacity of filter elements under ideal lab conditions. Figure 1 depicts the test circuit where hydraulic fluid is circulated at a constant flow rate in a closed-loop system with on-line particle counters before and after the test filter. Contaminated fluid is added to the system at a constant rate. Small amounts of fluid are removed before and after the filter for particle counting to calculate the filter efficiency (capture). The capture efficiency is expressed as the Filtration Ratio (Beta) which is the relationship between the number of particles greater than and equal to a specified size (Xμ[c]) counted before and after the filter. In real-world terms, this test is the equivalent of testing a filter in an off-line kidney loop rather than replicating an actual hydraulic or lube system. It’s basically a filter cart test. ###### Topics: [ISO 16889](https://www.hyprofiltration.com/blog/topic/iso-16889) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [filter performance](https://www.hyprofiltration.com/blog/topic/filter-performance) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) ###### 3 min read ### [DFE: Testing Filters Under Real-Life Conditions (Part 1 of 4)](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-1-of-4) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Jun. 20, 2017 [![](https://www.hyprofiltration.com/hubfs/images/DFE/Filter-Element.jpg) ](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-1-of-4) The Dynamic Filtration Efficiency (DFE) Test is Hy-Pro's standard for testing filter elements. Throughout this four-part series  (find parts [two](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-2-of-4), [three](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-3-of-4) and [four](https://www.hyprofiltration.com/blog/dfe-testing-filters-under-real-life-conditions-part-4-of-4)) we'll discuss what it is, why it matters and why elements engineered with this test in mind outperform others in real-life applications. First, let's start with the basics. ## Why are filters used? How are they rated? All hydraulic and lube systems have a critical contamination tolerance level that is often defined by -- but not limited to -- the most sensitive system component such as servo valves or high-speed journal bearings. Defining the ISO fluid cleanliness code upper limit is a function of component sensitivity, safety, system criticality and ultimately getting the most out of hydraulic and lube assets. ###### Topics: [ISO 16889](https://www.hyprofiltration.com/blog/topic/iso-16889) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [filter performance](https://www.hyprofiltration.com/blog/topic/filter-performance) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) ###### 3 min read ### [When a Pump Fails, the Whole System Fails: Hydraulic Pump Reliability](https://www.hyprofiltration.com/blog/hydraulic-pump-reliability) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Tue, Feb. 21, 2017 [![](https://www.hyprofiltration.com/hubfs/images/Hydraulic-Pump.jpg) ](https://www.hyprofiltration.com/blog/hydraulic-pump-reliability) ## The Problem: Hydraulic Pump Failure  ## Pumps are the heart of hydraulic systems. When the pump fails, the entire system is down until the pump is operational again. This poses a serious threat to any operation relying on hydraulic systems for productivity. Recently, a hydraulic valve manufacturer was losing 25 pumps a year on their centralized hydraulic system at a cost of $2,440 each -- and that’s only the pump cost. When you account for maintenance resources, lost oil and lost production, each failure costs ~$25,320. ###### Topics: [hydraulic fluid](https://www.hyprofiltration.com/blog/topic/hydraulic-fluid) [ISO 4406](https://www.hyprofiltration.com/blog/topic/iso-4406) [breathers](https://www.hyprofiltration.com/blog/topic/breathers) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [hydraulic pump](https://www.hyprofiltration.com/blog/topic/hydraulic-pump) ###### 4 min read ### [Diesel Fuel Filtration 101](https://www.hyprofiltration.com/blog/bid/335796/diesel-fuel-filtration-101) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Wed, Apr. 02, 2014 [![](https://www.hyprofiltration.com/hs-fs/file-520621061-jpg/images/shutterstock_85522450.jpg) ](https://www.hyprofiltration.com/blog/bid/335796/diesel-fuel-filtration-101) # Reduce unplanned downtime and maximize the fuel efficiency of your diesel engines Diesel engines are widely used today. You can find them inside buses and tractor trailers traveling our roads, humming along in construction equipment and drill rigs, submerged in marine environments, and helping save lives in hospital generators, amongst many other applications. Diesel engines are popular for good reason. Not only do they have cleaner exhaust emissions, but they are also known for more reliable starts in extreme temperatures. ###### Topics: [water](https://www.hyprofiltration.com/blog/topic/water) [Water Contamination](https://www.hyprofiltration.com/blog/topic/water-contamination) [diesel](https://www.hyprofiltration.com/blog/topic/diesel) [filtration](https://www.hyprofiltration.com/blog/topic/filtration) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [contaminination](https://www.hyprofiltration.com/blog/topic/contaminination) ###### 1 min read ### [Keeping Clean in a Dirty Environment [Case Study]](https://www.hyprofiltration.com/blog/bid/266218/keeping-clean-in-a-dirty-environment) By [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) on Fri, Feb. 08, 2013 ![dirty mining excavator ](https://www.hyprofiltration.com/hs-fs/hubfs/mining-excavator-1736289_1920.jpg?width=575&name=mining-excavator-1736289_1920.jpg "dirty mining excavator ") Mining is a dirty business, as you can imagine, and equipment used to aid in mining efforts is not immune to the filth. Yet it is imperative to keep fluid clean. Not only will it save time and money, it lessens the amount of downtime for repairs, which is always a great goal. ###### Topics: [contamination](https://www.hyprofiltration.com/blog/topic/contamination) [case study](https://www.hyprofiltration.com/blog/topic/case-study) [hydraulic](https://www.hyprofiltration.com/blog/topic/hydraulic) [All posts](https://www.hyprofiltration.com/blog/all) ### Featured ### Sign up for updates ## Have a Question for Donaldson Hy-Pro? 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