If the strainer contaminant indicator has never shown need for basket filter element replacement, then the by-pass valve could be no longer functional.

Make sure that your order of new Filson duplex strainer or replacement meets all the specification as your present application. And then, it will ensure that the pressure of the system is always at a constant level.

In chapter 2, we learned about duplex strainer working principle, and here you are going to expound on duplex filter element working principle.

Hence, paper and pulp pipeline strainers trap and hold the unseen lumps as well as clean traces of paper or pulp from waste water effluent during discharge.

Filson stainless steel duplex strainer is mainly made of stainless steel 304 or stainless steel 316. The special material makes it possess a good rigidity and high strength and with excellent temperature and corrosion resistance, stainless steel duplex strainer is always applied under tough conditions.

All these duplex strainers can be put into use for chemical industry, oil and gas industry, pulp and paper industry, pharmaceutical industry, metals and mining industry, water and waste management, power industry, petrochemical and refining.

In essence, filter and strainer are semantically related words each standing for different meaning depending on the duplex filter design and specification.

v. Take out the cover nuts to lift out the cleanable screen to purge out the sediment or dirt lodged on the perforation of the screen.

First, before trying to remove the basket filter element, you must release pressure within the strainer, and make sure that specific unit is cooled off.

You need to consider so many factors, from type of material, design and ability to filter water, oil or any other fluid.

Filson 2 inch duplex strainer is a type of basket strainer built to fit a fuel, oil or water piping system and it is used to remove large particles of dirt and debris.

xii. Alternatively, if you use an equalizing valve, it is possible to run it after refitting the top cover solely for the purpose of venting that chamber. However, the valve should be closed once the operation done and the cleaned chamber is ready for operation.

A recommended safe differential pressure to start cleaning of the screen is 20 psi since the there is a rapid rate of increase in pressure drop when the screen gets heavily clogged.

iv. Stainless steel the most suitable housing material for duplex strainers where corrosion poses the greatest challenge. That is why most chemical, beverage and food, and pharmaceutical industries widely use stainless steel strainers.

Also, duplex strainers are similarly used in the same way in refineries as well as in oil pipelines to protect meters and pumps from undesirable materials.

The system also contains a valve handle installed between the two baskets to switch the flow to one strainer while the other is being cleaned or changed out. On some Filson duplex strainers, the valve will be designed and built to work automatically and the independent strainer will perform a self-cleaning operation.

Here, pipeline duplex strainers help remove skins, pulp or foreign matters from blended fruit juices. On the other hand, they are used to take out lumps from honey and chocolate syrup.

ix. Check whether the cover seats on the handle correctly before touching the strainer housing units. Place the cover and cover nuts back to tighten it properly.

iii. Bronze has better corrosion resistance properties. Also, it can withstand mechanical and thermal shock more effectively as compared to iron. On the contrary, it has a limited temperature range.

There are somewhat four types of duplex strainer structures differentiated by the medium flow diverter mechanism and size.

This helps avoid damages from by-products, dirt and scale and constantly averting costly downtime by installing pipeline duplex strainers preceding the line.

The real trapping and collection of these coarser impurities in any pressure system is done by the screen filter element.

The installation of two duplex filter element chambers allow for uninterrupted operation even during maintenance of duplex filter assembly.

Filson duplex water strainer is the best choice for a water system. It captures the particles, solids and impurities of the passing water flow to filter the medium. With two independent strainers, it allows a high working efficiency.

Filson duplex filter mainly consists of two welded steel housing with covers that are fastened via screws and nuts. You can download this duplex filter PDF catalog to learn more about Filson duplex filters.

In order to achieve low pressure loss, the medium is taken through a rather straight flow path that experiences minimal diversion in the directional flow.

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ii. Carbon steel is suitable for applications with higher temperature, mechanical or thermal shock. It’s a perfect choice for petrochemical and oil industries.

In addition, they trap birds’ feathers, insects, leaves and many more to prevent ingress of cooling towers, which are open to the environment.

Leave your name, email and requirements of connection size, flow rate, operation temperature, strainer housing and other duplex strainer specifications in the information sheet, our professional engineering sales will show you a suitable duplex strainer.

Once the clogging indicator alarms, it is recommended to immediately carry out basket filter element changeover exercise.

Filson designs and manufactures high-quality duplex basket filters and strainers to top brands in different industries. Like the Chemical industry, Power plants, air-conditioning and refrigeration technology, automotive and construction machinery industry, Shipping processes, Lub oil filtration, Ballast Water, and so on.

Filson provides 10inch duplex stainer in a high design and manufacturing standard according to ANSI and ASME. And it can be customized to fit your specific needs.

For offshore applications, extremely compact design is recommended to promote smooth operation as well as a standby option in a single duplex unit.

Duplex strainers are conveniently positioned at the intake of condensers, heat exchangers and pumps to avoid clogging of nozzles and flow meter.

x. Restore the plug into its original place to avoid damage to the O-ring. You may now move the lever-handle slightly to allow for partial medium flow into the cleaned bowl to vent-off air and precisely re-seat the bleed screw.

vi. Use pressure water to thoroughly clean and flush the chamber, but remember to protect the basket chamber screen from intentional contamination during the cleaning. The bottom section is clean or filtered part of the duplex strainer.

As the duplex strainer size increases, the use of the ball or plug type diverter design becomes cumbersome and impractical altogether.

4Duplex Strainer

They are fitted with dry-gas seals that are extremely sensitive to fluid particulates such as aerosols, condensates and solid particles.

The duplex filter element consists of innumerable housing containing with a couple of 3 µm filters, check valve and a differential pressure switch-system.

Industrial parks sewer pipelines incorporate strainers to fish out solid materials that can build-up and lead to blockage of the waterway.

In all these systems, in case the duplex strainer is clogged or there is a breakdown, simply switch to the other chamber.

iii. First, identify the chamber to be cleaned. Of course, you can identify it using the position of the lever handle. Therefore, you have to turn the plug handle in the position of the other standby chamber.

iv. Make sure the handle completely turns into place, this will protect the operator from leakage if a tight shut-off is not immediately incorporated. Do not rush in but carefully undo the drain plug-in that chamber to release pressure before fully accessing the chamber.

This duplex strainer structural design permits no operation interference because a special plug port is infused in the diverter mechanism plug.

In order to present the market with smooth paper finishes, there is need to discuss the problem of unseen and undispersed clumps contained in coatings.

For the fossil power generation engines to work at optimum performance specification, their fuel-gas combustion chambers require clean and dry supply of gases.

However, before rushing to open up the strainer, make sure you check whether there is any leakage, but if none continue to the next step.

I know you’d wish to remove debris, dirt or large particles from oil, water or fuel without shutting down the entire system.

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If you also need single basket strainers or a portable filtration system, Filson can also help with this. We request your inquiry on any problem with our duplex filters.

Therefore, whenever the strainer basket requires to be cleaned, you should turn the lever-handle thereby setting the used chamber free.

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It eventually clogs or get contaminated, the pressure differential shoots up between the duplex strainer input and output flow.

A ball type duplex strainer effectively removes debris and dirt from medium flow as well as provide protection on other sensitive components.

This type of duplex strainer is economical, simple and trouble-free design fitted with pressure-rated plug valve to the straining chambers.

Filson duplex strainer, as well as duplex type strainer or dual strainer, is a main basket strainer type manufactured by Filson. It is a perfect choice to provide continuous operation without any downtime during basket cleaning or change out.

Most products of cosmetics and pharmaceuticals that contain undissolved matter or undispersed clumps flow into pipeline strainers.

viii. Now, take back the screen into the strainer’s chamber and make sure that its handle protrudes above the top of the strainer body.

Filson manufactures 3 inch duplex strainer to adjust a 3 inch size pipeline. It can be made of stainless steel, carbon steel, cast iron and PVC to meet customer specifications.

Filson Metal Filter Cartridge is an ideal choice for backwash filtration, high temperature and harsh environment applications. It can be cleaned and re-used for many times.

The new technology has made most manufacturers to rely on the novel-modular structural design concept that allows for use of fabricated body.

This allows you to give the best in-pipeline protection in various industries such as chemical plants, petrochemical plants, process plant and refineries.

The duplex strainers come with an in-built lifting jack that is used to lift up the diverter plug off its port when operating the lever-handle.

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i. You should wear all the necessary safety gear such as overall, gloves, goggles, etc. They will protect you from possible injuries.

However, it does not mean that those basket filter elements are perfect as at times they may breakdown or need an overhaul.

An ideal duplex filter working principle should allow for overhaul of filter media while running, and the duo filter element in the assembly provides redundancy.

When the fluid drains to a level below the top of the basket filter element, close the drain valve, and go ahead and remove the basket.

And of course, whenever you’re buying duplex strainers, they should come with differential pressure gauges and electrical switch units.

Furthermore, using duplex strainers help improve occupational health and safety at work as well as protect the environment.

Therefore, it is very important to use duplex strainers to clean water drawn from the ocean or sea to avoid abrasive wear on the system components.

I will walk you through every aspect, from basic definition, working principle, installation to technical data of duplex basket strainers.

Just like ball type duplex strainer, lever-handle is used to accomplish the medium change-over by turning it through a 900 arc manually by hand(s).

Filson 4 inch duplex strainer provides a continuous work with two seperate strainer baskets working by turns. Spare both time and labor and improve the filtration efficiency to the maximum at the meantime.

Duplex strainers also form an integral part of desalinization equipment where they eliminate unwanted solid matters or dirt from the inlet before the salt removal process.

The duplex filter assembly is designed to ensure a clean filtered medium supply in an oil filtration system under pressure.

Filson manufactures duplex strainers with a wide range of connection size from 1inch to 24inch. And 8inch duplex strainer is one of them to block contaminants and unidentified matters from liquid, viscous and gaseous media.

We have certified, professional and expert technicians based locally in Sydney, so we can send a technician to your place in a timely manner - each and every time.

As the pressure differential increases through the filter system, a preset limit is reached and pressure switches turn on because the contact closes.

ii. Check both the pressure and temperature of the duplex strainer system. Furthermore, you should confirm that medium in the duplex strainer is neither hazardous nor cause and form of risk.

According to strainer industry, the screen openings is known as mesh, while the size of the opening through the basket filter media is called perforations.

Duplex strainerworking principle

This helps to eliminate potentially dangerous and costly leakage into the unused chamber during cleaning and routine maintenance.

vii. Continue to replace the washer and drain plug. Also, check whether the O-ring is still in condition otherwise, replace it.

When the system is in operation, the two separate duplex strainer basket works by turns to realize a non-stop working process. The work of a Filson duplex strainer is basically to remove impurities such as debris, huge particles and other dirt from fluids. It also guarantees a smooth flow of the fluid in the system.

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The filter chamber is kept under pressure while working to allow the fluid to flow via the basket filter element in the designed directional flow.

Anyway, that was just a by the way – but I guess the type of basket strainer material is critical, you can’t just ignore it.

As the oil purification systems filter gallons, the filter media in operation traps and removes impurities from the medium stream.

There are different areas where pipeline duplex strainers mean equipment protection, cleaner products and simpler separation of unwanted solid materials from liquids.

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Filson 12inch duplex strainer, with special material and robust construction, can be applied in many industrial usage including chemical, pharmaceutical, water and waste management.

Filson supplies various duplex strainers types, such as 2 inch duplex strainer, 6 inch duplex strainer, duplex oil strainer, duplex water strainer, stainless steel duplex strainer…

Therefore, fossil power generation must use duplex strainers not only to clean the fuel but also to protect the machines and clean water for cooling.

The integral ball-valve system design provides an instantaneous shutoff and bubble tight sealing at the point of diversion.

You will hardly notice the difference between the two; duplex strainer and duplex filtering cartridge. Although, they both serve the same purpose.

And the table below shows a summary of filter elements technical specifications courtesy of Hydac as per the industry recommendations:

Our technician will give you a fixed upfront cost, meaning you will always know the price before we start any work. No surprises!

This gap allows the seal gas to flow, and to protect the seal for longer service life, the seal gases must be strained appropriately.

We strive to provide the most effective, trustworthy, specialised heating and cooling services out there for a wide range of residential and commercial purposes.

Filson duplex oil strainer, also named duplex fuel oil strainer, is an ideal strainer for oil handling systems. And it is also applied for those applications which require a continuous supply of oil without any interruption.

Note that leakage around the strainer housing is due to poorly tightened bolts or cover knobs, damaged or dirt cover seal, drain plug and vent plug.

Also, the duplex filter element surface is critical in determining the differential pressure, hence, it is fitted with an electrical switch, which closes contacts to alert a lodged filter.

Now, you can carefully unpack the new basket filter element, remove the packaging papers and reinstall the basket at the same position.

Over years, there has been a tremendous development in the structure of duplex strainers to meet system or medium requirements.

The two chambers of the duplex strainers come with a pleated or smooth filter elements through which the fluid flows from the inner to the outer piping.

It is usually fitted with a unique ball-valve cartridge flow diverter that helps isolate the two basket chambers as well as to prevent medium overflow.