Duplex Basket Strainers

A basket strainer is a device that uses a mesh screen to filter out foreign particles in a horizontal pipeline. These particles are removed from the strainer and will not make their way into downstream equipment like pumps, valves, and traps.

A duplex Basket Strainers Duplex strainer or twin basket strainer is a type of filter built into a fuel, oil, or water piping system, and it is used to remove large particles of dirt and debris. The duplex strainer system usually consists of two separate strainer baskets housings. The system also contains a valve handle between the two baskets to divert the liquid flow to one strainer while the other is being cleaned. The valve will work automatically on some strainers, and the strainer will perform a self-cleaning operation.

These strainers are installed in pipelines where the flow cannot be stopped. Depending upon their NB size, they are capable of filtration up to 40 ┬Ám. Basket Strainers find use in industries where impurities are primarily solids. Unlike other strainers, it is easy to conduct maintenance on them.

Duplex strainers are mainly used in various industries such as the process industry, power industry, chemical industry, oil, and gas industry, pulp and paper industry, pharmaceutical industry, metals and mining industry, water and waste management, firefighting industry, refineries, and petrochemical plants. Strainers are used to remove hazardous elements that might cause partial or complete breakdown of operations if they get into the system.

Cast stainless steel body is standard with duplex strainers with flanged and thread ends. They are for use in continuous flow applications to avoid shutting down the system for cleaning. Sim ly moving the handle to the right or left will divert flow to the chamber under the handle, which allows for cleaning the basket that is not in use.

This duplex is designed with two stainless steel balls or diverters that efficiently divert the pipeline flow from one basket chamber to the other. In addition, TFE seats ensure a positive seal and help prevent seepage into the chamber being cleaned.

The duplex basket strainer has a low torque handle that is easy to open. And no special tools are required to access and remove the straining element, which can be any configuration of perforation or mesh lining.

 The ideal use for a duplex basket strainer is when the piping system cannot be shut down for basket cleaning. Two screened baskets trap debris with a lever that switches between the two, allowing one basket to be cleaned with no interruption in flow – a benefit that is sometimes crucial. 

The duplex strainers (dual strainers) are available with threaded or flanged connections. Standard screens are provided for WOG (water, oil, gas) service, but other screens are available on request. Different screens can also be used in each chamber so that different batches can utilize the most appropriate screen. 

These strainers are usually supplied in one of four materials: iron, carbon steel, bronze, or stainless steel. Y strainers are also used on pipelines. Iron is used most often because it costs the least and has good corrosion resistance in the water and many other services. Industrial Strainers and Carbon steel are used where higher temperatures or concern with thermal or mechanical shock is an issue, making them popular in the oil and petrochemical industries. Bronze handles thermal and mechanical shock better than iron and is better in some corrosive applications but is limited in the temperature ra e. Stainless steel is needed where corrosion could be an issue. It is widely used in the chemical, food, and pharmaceutical industries. Bronze Strainers can be used in continuous flow applications to avoid shutting down the system for cleaning. Simply moving the handle to the right or left will divert flow to the chamber under the handle, which allows for cleaning if the basket is not in use.

Standard diverters are bronze but are also available in bronze or stainless steel. And different size basket perforations and meshes are available in stainless steel, Monel, and brass to meet specific media requirements. Other options include magnetic inserts, 100% shutoff seals, air eliminators, mounting hardware, and unique sealing materials. Non-Shock Working Pressure for the DBF is 255psi at 150F for water, gas, and oil (WOG) liquids. Not for steam service.

Cast Iron and duplex strainers have cast iron steel bodies for use in continuous flow applications to avoid shutting down the system for cleaning. It supplements the DCF model duplex strainer available in up to 4″ sizes.

It utilizes four stainless steel ball valves that efficiently divert the pipeline flow from one basket chamber to the other. In addition, Teflon seats ensure a positive seal and help prevent seepage into the chamber being serviced for cleaning.

The handle position clearly indicates which basket is in service and which basket can safely be removed for cleaning. Other strainers include a temporary strainer, Wye Strainer, and Tee Strainer.

Duplex Basket Strainers made of Cast Iron are not recommended for some services. However, Duplex strainers are used in the Wastewater and the chemical industry.