Magnetic Inserts for Fabricated and Standard Cast Pipeline Strainer Baskets from Eaton

Although a mesh lined Eaton strainer basket will catch and remove very small unwanted particles (down to 400 mesh), there are applications where microscopic iron or steel particles are present in the fluid. Because of their size they will often pass through the finest mesh screen. The problem is particularly prevalent whenever there is wear of iron or steel parts against each other in the system.

Examples are cooling or lubricating lines to bearings, liquids being processed on rolls or roller mills such as paint or ink, and any material passing through a gear system. A simple, cost-effective way to remove these damage causing particles is to install magnetic inserts in the Eaton strainer basket. All the fluid passes over the powerful magnets, which catch the fine steel or iron particles that may otherwise pass through the mesh lining of the basket.

The magnets are Alnico, guaranteed to retain their magnetism indefinitely, and so powerful they will hold metal several times their own weight. They are
completely encased and sealed in a 1/8” thick type 316 stainless steel shell— thus assuring freedom from contamination or corrosion.

Learn how to figure the ratio of free area to pipe area from Eaton Filtration

We are often asked how to figure the ratio of free area to pipe area when a customer changes/requires different perforations or  mesh sizes  in a industrial strainerHere is a simple calculation to do this.

A. With perforated basket( s ), take the gross · screen area of the model and size strainer times the percent open area of the perforation required and divide by 100. This gives the new free area. Divide the new free area by nominal area to get the new ratio of free area to pipe. Ex.: 2″ #72 with 7/64 perf- gross area 50.9 X 46.0 the (% open area of 7/64″) divided by 100 =
23.4. 23.4 divided by 3.35 (nominal area) = ratio free area to pipe of 6.9:1.

B. With mesh basket(s)- the same calculation as for perforated baskets above but use 5/32 perf (standard with mesh lined baskets) having 63.0% open area. After
you get the free area of the perf, multiply it by the open area % of the mesh divided by 1 00 to obtain the free area of perf/mesh combined. Divide this answer by the nominal area of the pipe to get the new  ratio of free area to pipe. Ex.: 2″ #50 with 100 mesh- gross area 64.0 X 63.0 (the % open area of 5/32″ perf) divided by 1 00 = 40.3. 40.3 X 30.3 (% open area of 100
mesh) divided by 100 = 12.2. 12.2 divided by 3.35 (nominal area) = ratio free area to pipe of3.6:1.

After you try it a few times, you will see how really simple it is!

For more helpful tips follow Eaton Filtration on Twitter @AskFilterman or like us on Facebook

Baggage-Free Eaton Strainers Make Perfect Landing at JFK – Success Story

John F. Kennedy International Airport

“The Eaton strainer has been operating at JFK airport for the last 15 years without maintenance or attention. The ruggedness and durability has been great.”

Christopher Gogola
Maintenance Manager, JFK Energy Center


Located on Jamaica Bay in the southeastern section of Queens County, N.Y., John F. Kennedy International Airport has more than 30 miles of runway surface and occupies some 4,930 acres of land. Better known as JFK, the airport has seven operating airplane terminals and roughly 125 aircraft gates.

More than 90 airlines operate out of JFK, which also serves as the base of operations for JetBlue Airways and the international gateway hub for American Airlines and Delta Air Lines. The airport is the fourth largest hub for American and the sixth largest hub for Delta.

JFK handles close to 60 million yearly passengers, making it the world’s 12th busiest airport by that measure. The airport also serves as the work site for some 35,000 employees.


All those passengers and employees are kept warm in the winter and cool in the summer thanks to a heating, ventilation and air conditioning plant with a cooling tower located in the central terminal area. The tower must operate efficiently 24 hours a day seven days a week through all weather conditions.

To ensure this critical function is ready, the tower needs a strainer system that can not only handle the full load of 25,000 gallons per minute running through the tower, but also be maintenancefree and automated. Because of space constraints, the strainers also needed to be the primary source for removing dirt and other impurities.


JFK eventually chose Eaton for the job and selected a Model 2596 36-inch fabricated, automatic, self-cleaning strainer. Designed for the continuous removal of entrained solids from liquids, the automatic backwash strainer ensures maintenancefree operation of the system.

“This strainer has handled the full load of our water continuously for years for the supply of power to all of JFK airport,” says Christopher Gogola, maintenance manager for the JFK Energy Center. “It is critical to us to be sure there is no interruption in the power supply to the facility. Eaton has been a key component in this endeavor.”

With an automatic control system constantly monitoring the strainer operation, cleaning is accomplished by an integral backwash system in which a small portion of the screen element is isolated and cleaned by reverse flow. The remaining screen area continues to strain thereby providing uninterrupted water flow. The efficient design requires only a small amount of the strained liquid to carry away and dispose of the debris from the strainer.


Fifteen years ago, when the strainers were initially installed, Eaton’s engineers believed they had the precise design needed at JFK. That turned out to be a very good call, as the Eaton strainers are still delivering continuous, uninterrupted, maintenance-free service.

Gogola agrees, and noted, “The Eaton strainer has been operating at JFK airport for the last 15 years without maintenance or attention. The ruggedness and durability has been great.”

During that 15-year run, JFK has, of course, experienced delays and cancellations, unfortunately associated with any airport. Safely putting people and aircraft into the air and onto the ground practically dictates complications… especially so at one of the world’s busiest facilities.

Fortunately, all of those same people dealing with the delays and cancellations remained cool, warm and comfortable thanks, to a large degree, to the uninterrupted service of Eaton strainers