In industrial piping systems, the process medium may contain mechanical impurities such as sediment, debris, or solid particles. If not controlled, these impurities can travel with the flow and affect downstream equipment such as pumps, valves, or process equipment.

A Basket Strainer is one of the devices used to retain mechanical impurities in piping systems through a Screen – basket-type filter element. With a removable basket-type structure, the device allows the filter element to be inspected and cleaned when required.

The Lishui Jayu Basket Strainer SRBA-A150 is a basket-type strainer shown in the technical drawing provided, with DN80 and DN100 sizes. The equipment consists of main components including Body, Bonnet, Screen, Gasket, Vent, Drain, and Bolt/Nut, with different materials specified for each component according to the equipment structure.

Note: The provided document shows the construction, materials, and dimensions of the SRBA-A150, but does not provide parameters such as mesh size, filtration rating, maximum flow rate, working pressure, or pressure drop. Therefore, these parameters are not inferred in this article.

1. Overview of the Lishui Jayu Basket Strainer SRBA-A150

1.1. What Is a Basket Strainer?

A Basket Strainer is a device installed in a piping system to retain mechanical impurities of a size appropriate to the filter element.

Unlike some strainers with flat or Y-type filter elements, a Basket Strainer uses a basket-type Screen installed inside the body.

When the process medium passes through the Basket Strainer, the flow enters the strainer body and comes into contact with the Screen. Impurities are retained by the Screen, while the filtered medium continues downstream through the piping system.

As the amount of retained impurities increases, the Screen can be removed for inspection and cleaning according to the maintenance procedure of the system.

1.2. Introduction to Lishui Jayu and Model SRBA-A150

Lishui Jayu is the brand shown on the product provided, with the model SRBA-A150 Basket Strainer.

According to the technical drawing, the SRBA-A150 consists of:

• 1 – Bonnet
• 2 – Bolt/Nut
• 3 – Screen
• 4 – Body
• 5 – Drain
• 6 – Vent
• 7 – Gasket

The drawing currently provides two nominal sizes:

• DN80
• DN100

The equipment features a vertical strainer body, a removable bonnet on the top, and an internal Screen, allowing access to the filter element when inspection or maintenance is required.

1.3. Role of a Basket Strainer in a Piping System

A Basket Strainer can be used as a mechanical protection device for downstream equipment in a piping system.

Depending on the system design, the Basket Strainer may be installed upstream of:

• Pumps.
• Valves.
• Heat exchangers.
• Process equipment.
• Equipment requiring protection against mechanical impurities.

The actual installation location should be determined based on the process flow diagram, medium characteristics, and protection requirements of each piece of equipment.

2. Construction and Operating Principle of the Basket Strainer

2.1. Overall Construction

The Lishui Jayu SRBA-A150 is shown with a vertical strainer body, a bonnet on the top, and a Screen installed inside the body.

This construction allows the operator to access the Screen from the top after appropriate isolation and depressurization procedures have been completed.

The main components include:

Body → Screen → Bonnet → Gasket → Bolt/Nut → Vent → Drain

Each component performs a specific function during filtration and operation.

2.2. Body – Strainer Body

The Body is the main component forming the flow chamber and housing the Screen.

According to the drawing, the Body material is 20#.

The strainer body has two connections to the piping system, with the Screen installed internally to perform the filtration function.

When selecting and installing the Basket Strainer, the Body should be considered together with the actual operating conditions of the piping system and process medium.

2.3. Screen – Filter Basket

The Screen is the component that directly performs the filtration function.

According to the technical drawing, the Screen of the SRBA-A150 is made of 316L.

During operation, the process medium passes through the Screen while mechanical impurities corresponding to the retention capability of the filter element are retained.

As the Screen is the component directly exposed to the process medium and the location where impurities accumulate, its condition should be inspected periodically.

In particular, when a significant amount of impurities has accumulated on the Screen, cleaning should be carried out according to the applicable maintenance procedure.

Note on Filtration Capability

The current drawing does not specify the mesh size or filtration rating of the Screen. Therefore, a specific mesh size or particle retention size should not be stated unless additional technical documentation from the manufacturer is available.

2.4. Bonnet – Strainer Cover

The Bonnet is located at the top of the Basket Strainer.

According to the drawing, the Bonnet is made of Q235.

The Bonnet forms the upper section of the filtration chamber and is connected to the Body by the Bolt/Nut assembly.

From a structural perspective, the removable top-cover design provides access to the Screen for inspection and maintenance.

2.5. Gasket – Sealing Gasket

The Gasket provides sealing between the mating surfaces of the equipment.

According to the drawing, the Gasket material is specified as Metal.

The condition of the Gasket should be inspected whenever the equipment is disassembled. If the gasket is deformed, damaged, or no longer capable of maintaining proper sealing, it should be handled according to the maintenance procedure and technical requirements of the equipment.

2.6. Vent and Drain

The SRBA-A150 is shown with two auxiliary connections:

• Vent
• Drain

According to the drawing, both the Vent and Drain are made of A105.

Vent

The Vent is provided for venting or air release during appropriate operating procedures according to the system configuration.

Drain

The Drain is used for draining the medium or liquid contained within the equipment during appropriate operations.

During Basket Strainer maintenance, the Vent and Drain should be operated in accordance with the system isolation, depressurization, and safety procedures.

2.7. Bolt/Nut

The Bolt/Nut assembly connects the Bonnet to the Body.

According to the drawing, the Bolt/Nut material is B7 2H.

During assembly or maintenance, the bolts and nuts should be tightened in the appropriate sequence and to the tightening requirements specified by the equipment manufacturer.

3. Operating Principle of the Basket Strainer SRBA-A150

3.1. Flow of the Process Medium Through the Equipment

During system operation, the process medium enters the Basket Strainer through one of the equipment connections.

On the SRBA-A150 drawing, arrows on the piping indicate the flow direction through the equipment.

The medium then enters the chamber containing the Screen.

3.2. Retention of Impurities by the Screen

When the process medium passes through the 316L Screen, mechanical impurities corresponding to the retention capability of the Screen are retained.

The medium that passes through the Screen continues downstream through the piping system.

The basic process can be described as follows:

Medium containing impurities → Basket Strainer → Screen retains impurities → Filtered medium → Downstream equipment

The retained impurities gradually accumulate around the Screen during operation.

3.3. Filtered Medium Downstream

After passing through the Screen, the medium continues through the Basket Strainer and into the downstream section of the system.

The actual filtration performance depends on the characteristics of the Screen being used. Since the current documentation does not provide the mesh size or filtration rating, these parameters should be confirmed with the manufacturer before selecting the equipment for a specific filtration requirement.

3.4. Removal and Cleaning of the Filter Basket

When the Screen accumulates a significant amount of impurities, cleaning may become part of routine maintenance.

A general procedure includes:

Isolate the system → Depressurize/drain the medium → Open the Bonnet → Remove the Screen → Clean → Inspect → Reinstall → Check sealing → Return the system to operation.

The actual procedure must comply with the manufacturer’s instructions and the safety requirements of the system.

4. Materials of the Lishui Jayu Basket Strainer

The materials of each component are clearly specified in the SRBA-A150 technical drawing.

4.1. Body – 20#

The Body of the SRBA-A150 is specified as 20#.

This component forms the flow chamber and houses the internal Screen.

4.2. Screen – 316L

The Screen is made of 316L.

This is the most important component for the filtration function and is directly exposed to the process medium during operation.

When used with a specific medium, material compatibility should be evaluated based on the chemical composition and actual operating conditions.

4.3. Vent and Drain – A105

Both the Vent and Drain are specified as A105.

These components serve as auxiliary connections for venting and draining according to the system configuration.

4.4. Bolt/Nut – B7 2H

The Bolt/Nut assembly is made of B7 2H and is used to connect the Bonnet to the Body.

During maintenance, the condition of the threads, surfaces, and tightening capability of the fastening components should be inspected.

4.5. Bonnet – Q235

The Bonnet is made of Q235 according to the drawing.

The Bonnet forms the upper section of the equipment and provides access to the Screen during maintenance.

5. Technical Specifications of the Basket Strainer SRBA-A150

The technical drawing currently provides dimensions for two sizes: DN80 and DN100.

The above dimensions are taken directly from the Dimension table on the SRBA-A150 drawing.

Note

The above values represent the geometrical dimensions of the equipment, not its flow rate, working pressure, or filtration capability.

The current drawing does not specify:

• Mesh size.
• Filtration rating.
• Flow rate.
• Working pressure.
• Maximum operating temperature.
• Pressure drop.
• Filtration grade standard.

Therefore, these parameters should be confirmed separately when selecting the equipment for a specific system.

6. Dimensions and Connections of the SRBA-A150

6.1. DN80 Dimensions

For the DN80 version, the drawing specifies:

• L: 340 mm
• Ø: 159 mm
• H: 400 mm
• H1: 260 mm
• D: 190 mm
• D1: 152.4 mm
• D2: 127 mm
• S: 22.3 mm
• N-Ø: 4-Ø18

When arranging the DN80 equipment, these dimensions should be considered to verify the installation space and connection to the piping system.

6.2. DN100 Dimensions

For the DN100 version, the specified dimensions include:

• L: 420 mm
• Ø: 219 mm
• H: 470 mm
• H1: 310 mm
• D: 230 mm
• D1: 190.5 mm
• D2: 157.2 mm
• S: 22.3 mm
• N-Ø: 8-Ø18

Compared with DN80, the DN100 version has larger overall dimensions and uses the flange hole configuration shown as 8-Ø18.

6.3. Selecting the Size According to the Piping

When selecting a Basket Strainer, the nominal size should be compatible with the piping size and system design requirements.

The selection should not be based solely on nominal diameter. The following should also be checked:

• Flange dimensions.
• Installation face-to-face length.
• Space required for Bonnet removal.
• Clearance required to remove the Screen.
• Flow direction.
• Vent and Drain locations.

These factors are important to ensure that the equipment is not only compatible with the piping but also accessible for maintenance.

7. Advantages of the Lishui Jayu Basket Strainer SRBA-A150

7.1. Basket-Type Construction for Easy Screen Access

The SRBA-A150 features a Basket Strainer construction with the Screen installed inside the Body and the Bonnet located on the top.

This construction allows access to the Screen from the top when appropriate maintenance procedures are performed.

7.2. 316L Screen Material

The use of 316L for the Screen provides a defined material configuration for the component exposed to the process medium.

However, compatibility with each specific medium should still be verified according to actual operating conditions.

7.3. Vent and Drain Connections

The SRBA-A150 is equipped with Vent and Drain connections, providing provisions for venting and draining operations according to the system configuration.

7.4. Two Sizes Shown in the Drawing

The current documentation shows two versions:

DN80 and DN100

These allow selection according to the piping size within the range of the models provided.

7.5. Maintenance-Friendly Construction

The Basket Strainer requires periodic Screen inspection and cleaning during operation. With its removable Bonnet construction, the operator can access the Screen for maintenance after the system has been properly isolated and made safe.

8. Applications of Basket Strainers in Industrial Systems

Basket Strainers can be considered for piping systems where mechanical impurities need to be retained before downstream equipment.

8.1. Water Piping Systems

In water piping systems, a Basket Strainer can be installed to retain mechanical impurities within the retention capability of the Screen.

8.2. Pump Systems

A Basket Strainer can be installed at an appropriate location to help protect a pump from mechanical impurities contained in the process medium.

However, the exact installation location should be determined based on the pump suction/discharge arrangement and the pump manufacturer’s requirements.

8.3. Protection of Downstream Equipment

Impurities in piping systems can affect downstream process equipment. Therefore, a Basket Strainer can serve as a mechanical filtration stage upstream of:

• Valves.
• Pumps.
• Heat exchangers.
• Instrumentation.
• Other process equipment.

8.4. Industrial Systems Requiring Mechanical Impurity Removal

Depending on the material, process medium, and filtration requirements, a Basket Strainer can be considered for various industrial piping systems.

However, the mesh size and filtration rating should be determined before selection if the system has a specific particle-removal requirement.

9. Guidelines for Selecting a Basket Strainer

9.1. Selection According to Piping Size

The first step is to determine the piping size.

For the current documentation, the SRBA-A150 is shown in:

• DN80
• DN100

The selected size should be compatible with the piping design and connection configuration of the system.

9.2. Selection of Screen Material

The Screen is the component that directly performs the filtration function, so its material must be compatible with the process medium.

The SRBA-A150 drawing specifies 316L for the Screen.

If the system uses a special or corrosive medium, the compatibility of 316L should be verified before selection.

9.3. Determine the Filtration Requirement

This is one of the most important parameters, but it is not specified in the current drawing.

Before ordering, the following should be determined:

• Particle size to be retained.
• Mesh size.
• Filtration rating.
• Required flow rate.
• Allowable pressure drop.

These parameters should be confirmed with the manufacturer or supplier.

9.4. Check the Process Medium Conditions

The following should be identified:

• Type of process medium.
• Temperature.
• Pressure.
• Corrosiveness.
• Type and concentration of impurities.

The suitability of the Body, Screen, Gasket, and other components can then be evaluated based on the actual operating conditions.

9.5. Check Installation and Maintenance Clearance

Since the Screen needs to be accessed for cleaning, sufficient clearance above the Bonnet must be provided.

This is an important factor that can easily be overlooked when equipment is installed in a confined space.

10. Basket Strainer Operation and Cleaning Guidelines

10.1. Pre-Operation Inspection

Before putting the SRBA-A150 into operation, check that:

• The equipment has been installed in the correct location.
• The flow direction is consistent with the system design.
• The Bolt/Nut assembly is properly tightened.
• The Gasket is correctly installed.
• The Vent and Drain connections are in the appropriate condition.
• The Screen is correctly installed.
• The piping does not impose abnormal mechanical loads on the equipment.

10.2. Monitoring the Screen Condition

During operation, the Screen is a component that requires attention.

As the amount of retained impurities increases, the flow condition through the equipment may change. Therefore, the Screen should be inspected according to the system’s maintenance schedule.

If the system is equipped with differential-pressure measurement or another monitoring method, the data can be used to help determine when cleaning is required. However, the current drawing does not provide a specific pressure-drop value for the SRBA-A150.

10.3. Removing and Cleaning the Filter Basket

A general procedure may include:

Step 1: Isolate the Basket Strainer from the system.

Step 2: Ensure that the equipment has been depressurized and the medium has been safely drained.

Step 3: Use the Vent/Drain according to the appropriate procedure to ensure safe conditions before disassembly.

Step 4: Remove the Bonnet Bolt/Nut assembly.

Step 5: Remove the Bonnet.

Step 6: Remove the Screen from the Body.

Step 7: Clean the Screen and remove accumulated impurities.

Step 8: Inspect the Screen, Gasket, and related components.

Step 9: Reinstall the Screen and Bonnet.

Step 10: Properly tighten the Bolt/Nut assembly.

Step 11: Check sealing integrity before returning the equipment to operation.

10.4. Gasket Inspection

After each Bonnet removal, the Gasket should be inspected.

If the Gasket shows signs of damage or can no longer ensure proper sealing, it should be replaced according to the technical requirements.

10.5. Reassembly and Return to Operation

After cleaning has been completed, all connection points should be inspected before returning the Basket Strainer to operation.

The system should be returned to operation gradually, with the connection points checked for any abnormal leakage.

11. Important Considerations When Installing a Basket Strainer

11.1. Install in the Correct Flow Direction

Check the flow-direction arrow on the equipment and ensure that the installation direction is consistent with the system design.

11.2. Provide Sufficient Maintenance Clearance

Sufficient space must be provided above the Bonnet to allow the cover to be removed and the Screen to be taken out when cleaning is required.

This is particularly important for a Basket Strainer because the Screen is a component that requires periodic inspection.

11.3. Do Not Overlook the Vent and Drain

The Vent and Drain should be arranged and operated correctly according to the system design, especially during isolation and maintenance operations.

11.4. Check the Materials

The material of the Body should not be considered alone. All components exposed to the process medium should be evaluated, particularly the Screen, Gasket, and related components.

11.5. Confirm Filtration Specifications Before Ordering

If the system has a specific filtration requirement, the following should be confirmed:

Mesh size → Filtration rating → Flow rate → Pressure drop

with the supplier before selection.

These parameters are not specified in the current SRBA-A150 drawing.

12. Conclusion

The Lishui Jayu Basket Strainer SRBA-A150 is a basket-type filtration device designed for installation in piping systems to retain mechanical impurities through an internal Screen.

According to the technical drawing provided, the SRBA-A150 consists of Body, Screen, Bonnet, Gasket, Vent, Drain, and Bolt/Nut. The specified materials include 20# for the Body, 316L for the Screen, Q235 for the Bonnet, A105 for the Vent and Drain, B7 2H for the Bolt/Nut, and Metal for the Gasket.

The equipment is currently shown in two sizes, DN80 and DN100, with specific geometrical dimensions for L, H, H1, D, D1, D2, S, and N-Ø.

With its Basket-type construction, the SRBA-A150 allows access to the Screen from the top for inspection and cleaning when required. This is an important feature for the operation of piping systems containing mechanical impurities.

However, to determine whether the Lishui Jayu SRBA-A150 is suitable for a specific application, additional parameters should be confirmed beyond nominal size and material, including mesh size, filtration rating, flow rate, working pressure, temperature, and pressure drop. These parameters are not specified in the provided drawing.

ANCES can support the selection of Lishui Jayu Basket Strainers based on piping size, process medium, filtration requirements, operating conditions, and installation configuration of each system.