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Duplex Strainer

Description

Duplex Strainer Manufacturer India

DUPLEX STRAINER

Industrial Duplex Basket Strainer | Continuous Filtration System | DN 25 – DN 600

MNC Industrial Valves is a leading Duplex Strainer Manufacturer in India, supplying industrial duplex basket strainers designed for continuous pipeline filtration without process interruption.

Duplex strainers consist of two strainer chambers connected with a changeover valve system, allowing one basket to remain in operation while the other is cleaned. This design ensures uninterrupted flow and continuous protection of critical process equipment.

These strainers are widely used in oil & gas, chemical processing, water treatment, power plants, and marine industries where pipeline filtration must continue even during maintenance.

Fabricated construction allows large diameter sizes, higher flow capacity, and customized industrial designs for demanding process conditions.

PRODUCT TYPE

Product Duplex Strainer
Construction Options Cast Body
Fabricated Heavy Duty Body
Function Continuous Pipeline Filtration
Design Dual Basket Strainer Housing with Changeover Valve

INDUSTRIES

Duplex strainers are widely used in:

  • Oil & Gas Industry
  • Petrochemical Plants
  • Chemical Processing Plants
  • Power Generation Plants
  • Water Treatment Plants
  • Marine Industry
  • Steel Plants
  • Cooling Water Systems
  • Process Industries

APPLICATIONS

Typical applications include:

  • Pump suction protection
  • Cooling water filtration systems
  • Chemical process pipelines
  • Fuel oil filtration
  • Marine engine protection systems
  • Hydrocarbon transfer lines
  • Utility pipeline filtration

SUITABLE MEDIA

Water Sea Water Oil Fuel Oil Gas Petroleum Products Chemical Fluids Cooling Water Process Liquids

SIZE RANGE

Manufacturing Range: DN 25 mm to DN 600 mm

Extended Range: Above DN 600 mm available on request

Fabricated construction allows large pipeline filtration systems for high flow applications.

PRESSURE RATING

Available Pressure Ratings: PN16, PN25, PN40

ASME Pressure Classes: Class 150, Class 300

Pressure rating depends on body design and material thickness.

TEMPERATURE RANGE

Typical Temperature Range: βˆ’20Β°C to +300Β°C

Temperature capability depends on material and gasket selection.

END CONNECTION

End Type: Flanged End

Applicable Standards: ASME B16.5, EN 1092-1

DESIGN STANDARDS

  • Design Standard: ASME B16.34
  • Inspection & Testing: API 598
  • Valve Marking: MSS SP-25
  • Fabrication Welding: ASME Section IX

MATERIAL OF CONSTRUCTION (MOC)

Component Material
BodyWCB / SS304 / SS316
CoverWCB / SS304 / SS316
Strainer BasketSS304 / SS316
Changeover ValveCarbon Steel / Stainless Steel
GasketPTFE / Spiral Wound
BoltsASTM A193 B7
NutsASTM A194 2H

Material selection depends on process media compatibility.

FILTRATION ELEMENT

The filtration element consists of perforated stainless steel basket with internal wire mesh lining.

Typical filtration mesh sizes include:

  • 40 mesh
  • 60 mesh
  • 80 mesh
  • 100 mesh

Mesh selection depends on required filtration accuracy and process conditions.

DESIGN FEATURES

  • Dual basket strainer chambers
  • Continuous filtration operation
  • Manual changeover mechanism
  • Fabricated heavy duty construction
  • Large dirt holding capacity
  • Low pressure drop
  • Easy basket cleaning
  • Suitable for high flow industrial pipelines

OPERATING PRINCIPLE

Fluid flows through one basket chamber while the other remains on standby.

When the active basket becomes clogged, the changeover valve diverts the flow to the second chamber, allowing the first basket to be removed and cleaned without interrupting the process flow.

This design ensures continuous filtration in critical industrial applications.

INSTALLATION GUIDELINES

  • Install in horizontal pipeline
  • Ensure proper changeover valve orientation
  • Provide space for basket removal
  • Install isolation valves if required
  • Ensure proper gasket and bolting torque

MAINTENANCE GUIDELINES

  • Inspect baskets regularly
  • Clean accumulated debris
  • Replace damaged mesh
  • Check gasket condition
  • Ensure smooth changeover valve operation

ADVANTAGES OF DUPLEX STRAINERS

  • Continuous filtration without shutdown
  • Dual basket configuration
  • Large dirt holding capacity
  • Low pressure drop
  • Heavy duty fabricated construction
  • Reliable protection of pumps and equipment

DUPLEX STRAINER vs BASKET STRAINER

Feature Duplex Strainer Basket Strainer
OperationContinuousShutdown required for cleaning
Filtration ChambersTwoOne
MaintenanceOnline cleaningOffline cleaning
Process FlowContinuousInterrupted

Duplex strainers are preferred for critical processes where shutdown is not acceptable.

Frequently Asked Questions

1. What is a duplex strainer? +
A duplex strainer is a dual basket filtration system that allows continuous filtration while one basket is cleaned.
2. Why are duplex strainers used? +
They are used where pipeline filtration must continue without shutting down the process.
3. What industries commonly use duplex strainers? +
Refineries, power plants, marine systems, and chemical plants.
4. What materials are used for duplex strainers? +
Typical materials include WCB carbon steel, SS304, and SS316 stainless steel.
5. What mesh sizes are available? +
Typical mesh sizes range from 40 to 100 mesh depending on filtration requirement.
6. What pressure ratings are available? +
Common ratings include PN16, PN25, PN40, and Class 150 / 300.
7. What is the function of the changeover valve? +
The changeover valve diverts flow between two basket chambers.
8. Can duplex strainers handle high flow pipelines? +
Yes, they are designed for high capacity industrial filtration.
9. Are fabricated duplex strainers available? +
Yes, fabricated construction allows large diameter custom designs.
10. Are duplex strainers suitable for seawater service? +
Yes, especially when manufactured from SS316 stainless steel.
11. What testing standard applies? +
Testing is typically conducted according to API 598.
12. What filtration accuracy can be achieved? +
Accuracy depends on mesh size selection.
13. Can duplex strainers be automated? +
Yes, automated changeover systems can be provided.
14. What maintenance is required? +
Regular basket cleaning and inspection.
15. Where are duplex strainers installed? +
Usually upstream of pumps, compressors, and process equipment.
16. What is the advantage over Y strainers? +
Duplex strainers allow continuous filtration without pipeline shutdown.
17. Can duplex strainers handle slurry? +
Yes, depending on mesh size and design configuration.
18. What pressure drop occurs across the strainer? +
Pressure drop depends on flow rate, mesh size, and debris accumulation.
19. Can custom designs be manufactured? +
Yes, fabricated designs allow custom sizes and pressure ratings.
20. How to select the correct duplex strainer? +
Selection depends on pipeline size, flow rate, pressure class, mesh size, and media.

ENQUIRY DETAILS REQUIRED

To select the correct duplex strainer, please provide:

  • Strainer Type
  • Pipeline Size (DN / Inch)
  • Pressure Rating
  • Media
  • Operating Temperature
  • Mesh Size Required
  • End Connection
  • Quantity
  • Application Details

Our engineering team will assist in selecting the correct filtration solution for your industrial pipeline system.