Solids Filtration

Duration Filtration System reached 25 years in the field in 2017. To celebrate the milestone, the company has introduced a 25-year warranty on its filter elements.

Developed by John Hopkins Unlimited Inc., the Duration Filtration System is a solids filtration system with no disposable elements. “In the beginning, we started with oil filtration for natural gas engines,” said John Hopkins, president and founder of John Hopkins Unlimited Inc. Headquartered in San Antonio, Texas, USA, John Hopkins Unlimited manufactures the Duration Filtration System for global distribution. “After years of real-world testing, we found that the make and model of the engine didn’t matter. It works on high-speed and low-speed engines – Caterpillar, Clark, Cooper, Delaval, Jenbacher, Waukesha, White Superior. We have installed the Duration System onto engines running in the field in all conditions, in all operating environments, and the same filter element works across the board. Our filtration technology has not changed since day one. The only thing that has changed since the first filter went into the field 25 years ago is that today we offer two and three stage filtration systems. We have filtration systems running in engine oil, hot oil, amine, glycol, saltwater disposal, inlet gas, water jacket applications. The Duration Filtration System can replace 75% of an end user’s solids filtration needs, with no disposable elements what so ever.”

The Duration Filtration System is comprised of three components: a full-flow stainless steel bag-type filter element, a magnet, and a centrifuge. The three-stage system incorporate each component and is typically utilized in engine applications. The single, two-stage, three stage system utilizes only the filter element and magnet and is typically utilized in process applications such as inlet gas, amine, water jacket, and glycol saltwater disposal. The housing for the filter element can be designed to meet all required ASME codes for the application the system is being installed into.

The filter element is a bag-type filter made of 316L stainless steel. The filter element is designed to replace disposable filters such as cartridge filters, paper filters, sock-type filters, wire mesh systems, and others. Filtration properties go as small as from 10 micron and differential pressure (DP) as high as 250 DP.

“The advantage of bag-type filter element versus a cartridge filter element is that the bag-type filter flows inside-out, containing all solid contaminates with the element itself. With cartridge filters, the flow is outside-in. When oil or process fluid is drained to remove the filter, contaminates that did not impregnate on the filter fall to the bottom of the filter housing,” said Hopkins. “The reality is, not everyone is a diligent as they should be when it comes to cleaning or purging the bottom of the housing before the new filter element is put it. When the unit is restarted, all of the contaminates are immediately drawn back into the new filter element, shorting its lifespan. With the Duration Filtration System, the operator pulls the filter element and all of the contaminates remain inside the filter element. No purging is required, no drums to haul filters in, and no draining filters before disposal and packing drums to dispose. The filter element is cleaned with a pressure washer and returned to service. There is nothing to dispose of.”


Click here to read the entire article in the April issue.


Want your own copy of Gas Compression Magazine delivered directly to you each and every month? Subscribe for free and choose print or digital delivery (or both!).

Free to subscribe. Free to renew. Don’t miss an issue of Gas Compression Magazine!


Click here to subscribe to Gas Compression Magazine