Ultimate Guide to basket strainer

The mesh size is the key factor in the filtration efficiency of the strainer basket. It needs to be selected to filter the undesired debris. It determines the function and the size of particles that could be removed. So, you always choose the mesh size that is smaller than the smallest particles you want to remove.

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How to select the best basket strainer for your application?

Based on the different requirements of different industries and applications, the suitable basket strainer is accordingly different. Let&#;s analyze the factors from outside to inside.

The first thing you need to choose is the filter housing for the basket strainer. Where do you want to place the inlet and outlet, which connection type do you want to choose for your filter and application, and what kinds of sealing material is more suitable for your need? All those factors are important things you can see from the outside.

When it comes to the inside of the basket strainer, the strainer basket is what we pay attention to. Brother Filtration offers both standard top type and slanted top type for strainer baskets. The slanted top type is specially designed for the simplex basket strainer with the inlet and outlet at the same height.

Duplex Strainer: The Complete Guide for Importers

The following graphs of pressure drop and strainer sizing curves are used to design strainers:

Alternatively, a strainer could be referred to as a coarse filter.

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

Before we proceed further, how about you get a glimpse of filter and strainer structural difference.

Each strainer body may consist of one basket element or a string of small basket elements installed carefully.

The table below is courtesy of Hydac indicates a summary of standard filter housing technical specifications:

The design philosophy comes with a number of advantages:

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

The chambers are fitted with permanent strainers and the duplex unit mounted either horizontal/vertically.

Since you are now more enlightened about what duplex strainers are, it would be wiser to understand its structure.

The body is an important component of duplex strainer structure.

Now, let&#;s explore some of these essential structures:

The following units form the main structure of a duplex strainer:

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

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

That&#;s exactly what I am going to discuss in this section.

For that reason, you need a duplex strainer with a better design structure.

These may include compressors, pumps, valves and other sensitive components.

One of the main reasons for installing a duplex strainer is to protect other equipment and accessories downstream.

You can see the working principle of duplex strainer is simple and straight forward.

Let the fluid flow until chamber two gets clogged then direct flow again to the chamber that was in standby.

At the same time, clean the clogged chamber.

Switch to the next chamber which was on standby.

Once this chamber gets clogged, an alarm may go off or you&#;ll see a high pressure drop.

So basically, fluid will flow to one chamber of the duplex strainer through the inlet.

The problem could be in the piping system.

But don&#;t confuse this with an increased pressure drop due to sudden drop in fluid flow rate.

Once they get clogged the alarm goes off, hence a time to switch and clean the basket strainer.

In fact, there are duplex strainers with alarm systems.

It monitors changes in pressure within the duplex strainer chambers.

Normally, the clogging indicator can be in the form of a differential pressure gauge.

From the clogging indicator, you will know when to switch to the next chamber and clean the clogged one.

This will prevent possible back pressure or the basket strainer bursting (due to high inlet pressure).

You need to monitor the basket strainer for high pressure drop so that you can clean it in time.

It is time to switch to the next duplex strainer (the one which was on standby).

So, what does this imply?

This causes clogging and more pressure drop.

As the fluid flows through the duplex strainer, contaminants or parts begin to build up within the basket strainer.

Of course, at this point, the basket strainer will have virtually no or very little contaminants.

At the beginning, there will be a low pressure drop across the basket strainer.

In fact, the fluid flow shifts to the other chamber without filtration interruption once the set threshold is attained.

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.

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.

Both the inlet and outlet are labelled on the duplex strainer.

Logically, the proper orientation of flow will begin at the &#;inlet&#; and flow peripherally out to the &#;outlet&#;.

Besides, the inlet and outlet openings should match the piping flow.

It is important to order a duplex strainer with appropriate pressure and flow rating that match your pipe systems.

And by the way:

Of course, you can see that from the video above.

They have no moving parts.

The working principle of duplex strainer is very simple.

But first, I want you to watch this video:

Now, with that, let&#;s go ahead and learn how a duplex strainer works.

At the same time, it gives access to other duplex chamber parts without necessarily taking the strainer off the system.

Furthermore, it also reduces suction operation risks like air ingress.

The image shows various parts of duplex strainer courtesy of Mueller Steam Specialty:

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

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

Anyway, let&#;s get straight to the main subject of this chapter.

This way, you can make an informed decision when evaluating various specifications of a duplex strainer.

It is an essential information for both duplex strainer importers and buyers.

In this a chapter, you&#;re going to learn how a duplex strainer works.

Now, let me take you a step further and explore how a duplex strainer works.

You can switch from chamber A to B or vice versa, to ensure continuous flow in pipe systems.

You can easily know when the chambers need cleaning.

You will know when the system is clogged and needs cleaning.

A differential pressure unit will help you in checking the basket chamber operation conditions.

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

Moreover, a duplex strainer may have other accessories such as:

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.

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.

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.

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

i. Iron is commonly used because it is affordable compared to the other materials. It is also resistant to corrosion.

Please, I want you to note the following:

In most cases, the twin strainers are made from any of these materials:

Depending on the specific needs of your application, you can use a different straining element.

Its design is such that, fluid flows from inside to outside.

As the fluid flows through the basket, the element traps all solid contaminants.

At times it is covered with mesh widths and wire-cloth material.

The basket straining element is made of straight or staggering perforated plate.

Other liquid filter media are also competitively priced or customized.

The standard screens are usually for filtering water, oil, gas acronym WOG, etc.

This is an important component of the duplex strainer.

Also, the double strainer is available with either flanged or threaded end connections.

The unit has identical twin chambers tightly held with bolts to the central ball-valve assembly.

A duplex strainer is a simple unit that houses opposing outlet and inlet flange.

Depending on the design of the duplex strainer, they guarantee the following key advantages:

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

The truth is, there are many systems that require an uninterrupted flow system:

Below is an image of duplex strainer courtesy of Hayward:

Furthermore, in the process, there is no flow interruption.

This gives operators ample time to open, clean and replace the duplex filtering cartridge.

Diverter cartridge ensures an excellent seal shutoff between the twin chambers.

Of course, the medium flows similarly as in the other design.

This special cartridge functions the same way as the diverter plug.

Other duplex strainers, have the diverter cartridge instead of diverter plug.

But, that&#;s not all.

Do not worry, I will learn more about the ball and plug system in chapter 3.

It allows medium to flow either right or left.

Also, the duplex strainer may come with a diverter plug.

By a single operation or turning the lever, you will initiate the changeover mechanism.

Every duplex strainer has an integral ball-valve or plug system.

How do you make the change-over between the on-line and standby chambers?

I know you&#;re probably asking yourself this question:

Basically, there will be no downtime even when you&#;re cleaning or doing routine maintenance.

Therefore, you can use a duplex strainer continuously without stopping the system.

When the chamber that was working gets clogged, simply switch to the one that was on standby.

As one chamber is working, the other remains on standby.

Now, this is what happens:

Look at this:

In fact, each strainer has a dual basket filter element configuration.

Duplex strainer is a closed system, with two separate basket strainer chambers.

By the end of this guide, you will be able to import the right duplex basket strainers.

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

That&#;s why I want to help you choose a suitable duplex strainer.

You know, shutting down some systems is both impractical and uneconomical.

Yes, you need a duplex strainer to ensure continuous operation of the piping system.

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

Courtesy of Hayward Filtration

But this alone is not enough.

You need to know the relationship between the solid particle dimension and required screen specification.

Below is a strainer&#;s mesh sizes table courtesy of Project Materials:

 

STRAINER MESH AND OPENING SIZEMESH SIZEPARTICLE DIAMETER, µm45,,,,,

The standard mesh screen sizes ranging from 20 to 200 mesh.

And please have this in mind.

The mesh size does not necessarily indicate the particle retention ratings of the cleanable screen.

The number and diameter of inch/wire is what determines the particle size retention.

However, for critical applications, the cleanable screen should be chosen through a special particle retention ability.

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

 

TypeConnection Size Din DNMaterialsPressure range*

Temperature

[0C]

Weight

[kg]

Volume

[l]

Stainless SteelCarbon SteelWithout int. corrosion protectionWith int. corrosion protection 

50/

80/

100

&#; 

 

 

 

 

PN 16

 

 

 

 

 

-10 to 90

 

80

 

20

&#;&#;

100/

150/

200

&#; 

130

 

46

&#;&#;/

200/

250

&#; 

300

 

118

&#;&#;

200/

250/

300

&#; 

360

 

213

&#;&#; 

300

&#; 

460

 

433

&#;&#;

For finer medium straining, the common practice is to reinforce the basket perforations with a wire-mesh liner.

This is because the screen alone would not suffice.

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

They are conveniently placed inside the strainer bowl.

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.

The best and most common type of material is stainless steel.

Now, let&#;s take a look at the duplex strainer general structure.

Basically, a duplex strainer is designed and manufactured with dual-parallel basket strainers.

They ease and protect of the in-line of the filtration mechanism.

During cleaning and routine maintenance, the inline piping is bypassed.

3.3 Duplex Strainer Covers

The duplex strainer cover forms an integral structure of this mechanical device.

It should be easy to open, allowing for cleaning and maintenance.

3.3.1 Types of Strainer Covers

Some of the main types of covers include:

• Bolted Covers

In most strainers, the cover is usually bolted.

The bolts are not permanent as they are loosened to take over the cover to easily access the basket.

Duplex strainers with bolted covers

According to researches, bolt held covers are the strongest and highly recommended for high pressure systems.

• Clamping Yoke Cover

Tee-shaped and threaded handles are used to lock together cover to the strainer&#;s body.

Generally, the cover gets attached to the vessel with a hinge-mechanism, which gives the ease during removal.

Duplex strainer with a clamping yoke cover &#; Photo courtesy: Philips Pump LLC.

This type of duplex strainer is expensive as compared to the standard ones.

• Automatic Type

Duplex strainers designed with automatic type need no manual cleaning as the name suggests.

Here, the basket is made with a circular screen and made to rotate, and water inlet is routed to the basket.

This type of duplex strainer is typically for larger water supply systems.

For instance, lakes and rivers water inlets used for process and cooling.

Now, we are going to look into various duplex strainer structures.

You can remember in chapter 1, we mentioned ball-valve and plug system.

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

Let&#;s begin by the medium flow changeover mechanism type:

3.3.2 v Ball Type Duplex Strainer

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

It completely shuts off fluid for cleaning of the filter element.

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The table provides a size selection table for ball type duplex strainer structure courtesy of Hydac:

SizeBody & Cartridge MaterialConnectionSeat/SealDiverter BallsRating Standard (Metric)¾&#;, 1&#;, 1-1/4&#;, 1-1/2&#;, 2&#;, 2-1/2&#; 

Iron

Threaded 

 

TFE/ Buna N*

 

 

Stainless Steel

125# ANSI 200 PSIG @ 150F (PN16 13.8 bar @66C)1&#;, 1-1/2&#;, 2&#;, 2-1/2&#;, 3&#;, 4&#;Flanged¾&#;, 1&#;, 1-1/4&#;, 1-1/2&#;, 2&#;, 2-1/2&#;

Bronze

Carbon Steel

Stainless Steel

Threaded**

150# ANSI

200 PSIG @ 150F (PN16 13.8 bar @66C)

1&#;, 1-1/2&#;, 2&#;, 2-1/2&#;, 3&#;, 4&#;Flanged

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.

The system is activated using a handle to divert the system flow direction into the other free basket chamber.

Since the handle needs low operating torque, only human effort can easily turn the lever over.

Take a glimpse at a sketch of ball type duplex strainer technical details courtesy of Hayward Filtration:

Duplex Strainer Sample Technical Schematic

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

The position of the lever-handle indicates the chamber in service.

3.3.3 v Plug Type Duplex Strainer

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

The image shows the interior section of a plug type duplex strainer structure courtesy of Hayward:

Duplex Strainer Sections

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).

The table offers the duplex strainer selection chart courtesy of Hayward Filtration:

SizeBody MaterialPlug MaterialEnd ConnectionsSealsRating5&#;, 6&#;, 8&#;IronIron or BronzeFlanged 125# 

Buna N

200psi@ 100F. 5&#; and 6&#; sizes.

150 psi @ 100F. 8&#; size.

BronzeFlanged 150#6&#;, 8&#;Carbon SteelBronze or Stainless SteelFlanged 150#6&#;, 8&#;Stainless SteelStainlessFlanged 150#Viton

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

The entire medium flow diversion takes about 30 seconds.

The following is a sample sketch of technical details in this strainer courtesy of Hayward Filtration:

Duplex Strainer Technical Drawing Sample

The integral stop automatically places the plug each time at the exact right place.

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.

After the diverting the medium flow, the same lifting jack is used to place back the plug.

The lifting jack works even better under extreme pressures.

How about we continue with duplex strainers according to sizes:

3.3.4 v Large Duplex Strainers

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

In such instances, sliding-gate valve arrangements are preferable to change the medium flow direction.

The table shows the various sizes of large duplex strainer, where you can choose from courtesy of Hayward Filtration:

SizeMaterialEnd ConnectionSealsPressure Rating10&#; to 12&#;IronFlanged 125# 

Buna N

200 psi @ 100FBronzeFlanged 150#14&#; to 18&#;IronFlanged 125#150 psi @ 100FBronzeFlanged 150#

The valves-discs are accurately and precisely actuated by a set of hand-wheels, and synchronized to work inversely.

That is, as one basket housing opens to the medium flow, the other basket chamber is completely sealed off.

Here is a technical sketch on a large duplex strainer:

 Large Duplex Strainer Technical Drawing

You may come across other huge duplex strainers that use synchronized butterfly-valves to change medium flow course.

Do you have any question on duplex strainer structure and design?

You can leave a quick comment below.

Meanwhile, let&#;s explore another important of duplex strainers.

Chapter 4: Duplex Filter Element Working Principle

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

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

Filter basket

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

The duplex filter element should give a reliable oil purification mechanism for long periods before being changed.

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.

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.

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

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

At any point, a duplex strainer will use one filter chamber while the other is on standby.

The lever-handle is instrumental in the choice of filter and chamber to use.

The position of the lever-handle indicates the filter under operation.

Duplex filter technical data

Before you set duplex filter element in use, it should be filled and vented.

And please, note the flow direction of the as indicated on the filter element.

This will make sure the medium enters the duplex filter element from the top.

But, remember:

Cylindrical elements are highly recommended for filtering coarse solid particulates.

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

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

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

The dirty filtering cartridge can be removed, cleaned or changed.

It then remains on standby for use once the other gets clogged.

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

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.

A high surface-area pleated-screen provides a more effective filtration area.

You can place it in the medium flow path.

Chapter 5: Steps for Cleaning Duplex Strainer

In this chapter, I am going to walk you through how to clean a duplex strainer.

It is an important maintenance process.

Normally, when the duplex strainer is in use, it will eventually get clogged with solids and particles.

And as I had mentioned earlier, this leads to an increase in pressure difference.

Besides, it will also reduce the efficiency of the duplex strainer.

Remember, during this time, dirt will also accumulate in the filtering zone.

The good news is &#; with duplex strainers, you don&#;t have to shut down the entire system when doing the cleaning.

So is what you should do:

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

       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.

      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.

Changeover lever handle

         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.

 Position of the drain plugs

         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.

 Nuts holding the duplex strainer housing

           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.

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

        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.

          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.

           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.

         xi. Now you can take a complete turn of the handle to resume straining on the cleaned chamber.

        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.

       xiii. The process should be carried out for the other chamber when it is clogged.

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.

Caution: Ensure you don&#;t surpass the highest differential pressure to prevent the screen from collapsing.

Chapter 6: Duplex Basket Filter Element Changeover Procedure

In the earlier chapters, you learned that duplex strainer can run continuously with no shutdown.

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

Step 1: Monitor the Clogging Indicator for Possible Changeover

For a fact, the basket filter elements also have a service life, after which they get wear-out or need changeover.

Pressure gauge is usually fitted around the filter basket to check the optimal contamination capacity of the strainer.

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

Note that duplex strainer basket filter element without contaminant indicator are advisedly changed twice annually.

On the other hand, the ones with contamination indicator are done once a year.

Clogging indicator

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

As an operator, you must be vigilant to prevent use of worn out filter elements.

Step 2: Check Pressure and Change Flow

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.

This is a very important safety measure, you must adhere to.

The isolation valves on the strainer make it easier to cut-off pressure supply to strainer from the source.

It also prevents possible bodily injury and flood when taking out the strainer plug.

Balance valve

In the process, the medium is admitted slowly into the other standby basket housing through equalizing valve.

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.

Unfortunately, if there is leakage, shut-off the equalizing valve, vent and drain the basket filter element chamber.

Remove the basket chamber cover, address the leakage before re-assembling the unit.

Step 3: Remove the Old Basket from the Housing then Replace with a New One

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.

Take some time holding the basket filter element right above the chamber to drip.

Remove old basket from the housing

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

With basket filter element made of stainless metal, must be completely replaced because it is used.

Also, check the strainer cover seal and if it is damaged replace it.

Step 4: Reassemble the Duplex Strainer Unit

Reassemble the unit and secure the basket chamber cover.

To confirm the strainer&#;s chamber does not leak, open the equalizing valve to let medium flow from the vent-valve.

Take your time and check if there is any leakage otherwise close the vent-valve.

Parts of a duplex strainer

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.

Please make sure that the threads of the drain and vent plugs are clean and smooth during reinstallation.

In case, you choose to use thread sealer, it should be compatible with line medium.

The newly fitted basket filter element and cleaned housing are ready for medium changeover.

Chapter 7: Applications of a Duplex Strainers in Piping Systems

You can use duplex strainers in many industries.

Just as I had mentioned, it protects the components downstream.

These components may include relief valves, pressure-reducing valves and many others that must be clean.

It is one of the best ways to increase their service lifespan.

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

They are useful in oil purification systems.

Some of the main applications of duplex strainers include:

7.1 Duplex Strainers in Power Generation

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

Insufficiency of pre-filtration implies that aerosols and solids can ingress the combustion chambers unhindered.

This introduces abrasion and wear in the block, and costly repair and maintenance.

Hydro power generation plant

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.

It is equally required to strain transformer oil to curb clogging of the system.

7.2 Petrochemical Industry

Turbo machines are some of complex invention often used in the petrochemical industry.

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

Section of turbo machinery

The shaft movement creates a tiny opening of approximately 3 µm on the seal.

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

7.3 Petroleum Industry

Duplex strainers are useful in petroleum pipelines as in power generation.

They help remove and clean unwanted foreign impurities in gasoline and crude oil.

More specifically, fuel oil sometimes may contain gums, tars or other dirt which muffle the nozzles of fuel burner.

Hence, duplex strainers are installed in every oil burner to eliminate such impurities.

Section of a pipeline

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.

7.4 Duplex Strainer in Marine and Offshore Drilling

In order for ship engines together with its subsystems to work properly, you need clean and dry gases and fuel.

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.

Marine applications

In offshore oil and gas drilling, duplex strainers are recommended to increase throughput of the mining process.

7.5 Chemicals Manufacturing Industry

By far, the chemical industry is largest duplex strainer user for their pipeline.

In fact, chemical pipelines cannot run optimally without duplex strainers.

Chemical manufacturing plant

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

7.6 Water Treatment Plants

Just like in chemical industry, water pipelines are also other biggest beneficiaries of duplex strainers.

They are essential in removal of gravel, sand, debris from wells, lakes and stream.

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

They strain out lint and hair from large swimming pools before filtering the water.

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.

Water treatment plant

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

7.7 Pharmaceuticals and Cosmetics Industries

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

This helps remove such undesirable substances that ruin their products.

7.8 Paper and Pulp

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.

Paper pulp industry

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.

7.9 Process Plants

Most process systems usually cost a colossal amount of money thus, demand protection while running.

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

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

7.10 Food Industry

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.

I can&#;t list all applications here.

However, whichever the case, you will use duplex strainers in pipelines where continuous operation is paramount.

Conclusion

As you can see from this guide, duplex strainers play an integral role in most industries.

And, I am sure, the information in this guide will help you to buy efficient and reliable duplex strainer.

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

Feel free to contact us in case you have any questions on duplex strainers.

We are here to serve you, that&#;s why we offer free consultations on duplex strainers and other filtration systems.

Contact us to discuss your requirements of Water treatment basket strainer China. Our experienced sales team can help you identify the options that best suit your needs.

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