--- title: "Filter Sizing: Calculating Clean Element Delta P" description: Choosing which filter element you need can be a challenge because there are several factors to consider. One of the factors that should be considered is the differential pressure or Delta P of your filter. Check out this blog post A quick tutorial on calculating clean element Dp and filter element sizing. image: https://www.hyprofiltration.com/hs-fs/file-2655851405-jpg/images/clean_element_dp1.jpg --- [![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/bid/358065/filter-sizing-calculating-clean-element-dp#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) ** ###### 1 min read ### [Filter Sizing: Calculating Clean Element Delta P](https://www.hyprofiltration.com/blog/bid/358065/filter-sizing-calculating-clean-element-dp) Wed, Nov. 19, 2014 - [Tweet](https://twitter.com/share) ![filter elements and differential pressure](https://www.hyprofiltration.com/hs-fs/hubfs/Filter-Element-198030-edited.jpg?width=189&name=Filter-Element-198030-edited.jpg "filter elements and differential pressure")Choosing the best filter element size and media for a specific application can be tricky. You want media that is tight enough to help you reach your target ISO code. However, if you choose a media that is too tight for your application, the element differential pressure (Delta P or ΔP) will rise too quickly and you will be replacing elements far too frequently. To prevent these situations you should always calculate clean element Delta P whenever changing the filter media or manufacturer. ## Step 1: Gather Necessary Information Before you start, you'll need to gather a few pieces of essential information. They are: 1. Flow rate 2. Lowest temperature *What is the lowest temperature this oil will reach during shutdown, transfer, etc? (This will be used to calculate maximum viscosity in centistokes.)* 3. Specific gravity of the fluid 4. Filter element ΔP factor ## Step 2: Viscosity Chart Calculations  Use a [viscosity chart](https://www.hyprofiltration.com/viscosity-chart-/) to calculate the maximum viscosity of the fluid at its lowest temperature in centistokes. ## Step 3: Calculate the Delta P  Use the information you have gathered to solve the equation below for clean element Dp. ![Clean Element Dp](https://www.hyprofiltration.com/hs-fs/file-2655851405-jpg/images/clean_element_dp1.jpg?width=575&height=63&name=clean_element_dp1.jpg)   And that should be it for calculating your clean element Delta P. If you have any questions, please let us know if the comments below.  Next Step: Use our free [viscosity calculator](https://www.hyprofiltration.com/calculators). ###### Topics: [hydraulic fluid](https://www.hyprofiltration.com/blog/topic/hydraulic-fluid) [filter sizing](https://www.hyprofiltration.com/blog/topic/filter-sizing) [filter elements](https://www.hyprofiltration.com/blog/topic/filter-elements) #### Written by [Hy-Pro Marketing](https://www.hyprofiltration.com/blog/author/hy-pro-marketing) ###### [** Previous Post](https://www.hyprofiltration.com/blog/bid/347356/proper-filter-element-change-out-procedure) [![filter elements](https://via.placeholder.com/300x150.jpg/e0e7ee)](https://www.hyprofiltration.com/blog/bid/347356/proper-filter-element-change-out-procedure) ###### [How to Change Out a Filter Element](https://www.hyprofiltration.com/blog/bid/347356/proper-filter-element-change-out-procedure) ###### [Next Post **](https://www.hyprofiltration.com/blog/fluid-analysis-reference-guide) [![Hy-Pro Filtration fluid analysis test reports ](https://via.placeholder.com/300x150.jpg/e0e7ee)](https://www.hyprofiltration.com/blog/fluid-analysis-reference-guide) ###### [Fluid Analysis Reference Guide](https://www.hyprofiltration.com/blog/fluid-analysis-reference-guide) ### Featured ### Sign up for updates ## Have a Question for Donaldson Hy-Pro? 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