The Fabricated Duplex Strainer (also known as a Twin Basket Strainer) is the ultimate filtration solution for critical piping systems that require continuous operation without shutdown. Unlike simplex strainers, the duplex design consists of two separate filtration chambers connected by a manual or automated changeover valve. This allows one chamber to be cleaned or serviced while the other remains in full operation, ensuring 100% system uptime.
Custom-engineered from Mild Steel (MS) or Stainless Steel (SS), these fabricated units are designed to handle high flow rates and heavy debris loads in large-diameter pipelines where process interruption is not an option.
Key Features & Benefits:-
- Zero Downtime Operation: The integrated changeover mechanism (ball, butterfly, or plug valve) allows for a seamless transition between chambers. You can clean the "offline" basket without ever stopping the flow.
- Large Filtration Area: Fabricated construction allows for extra-large "pots," providing a high ratio of screen area to pipe area. This results in an exceptionally low pressure drop and longer intervals between cleanings.
- Mild Steel (MS): Cost-effective for water, oil, and non-corrosive fluids (available with epoxy or rubber lining).
- Stainless Steel (SS 304/316/316L): Ideal for corrosive chemicals, food-grade processes, and high-purity water systems.
- Compact Footprint: Despite having two chambers, the fabricated design can be optimized to fit into specific spatial constraints on skids or in mechanical rooms.
- Safety & Ease of Use: Equipped with pressure equalization lines and vent valves to ensure safe changeovers, along with bolted or quick-opening covers for rapid basket retrieval.
Technical Specifications:-
| Feature |
Mild Steel (MS) Fabricated |
Stainless Steel (SS) Fabricated |
| Common Grades |
IS 2062 / ASTM A516 Gr. 70 |
ASTM A240 304 / 316 / 316L |
| Size Range |
2" to 48" (DN50 – DN1200) |
2" to 36" (DN50 – DN900) |
| Pressure Ratings |
PN10, PN16, ANSI Class 150/300 |
PN10, PN16, ANSI Class 150/300 |
| Changeover Type |
3-Way Ball Valve / Butterfly Valve Linkage / Plug Valve |
3-Way Ball Valve / Butterfly Valve Linkage / Plug Valve |
| Screen Material |
SS 304 / 316 / 316L |
SS 316 / 316L / Monel / Hastelloy |
Target Industrial Applications:-
Fabricated Duplex Strainers are essential for "non-stop" industrial processes:
- Oil & Gas Refineries: Protecting fuel oil burners, lube oil systems, and pump suctions from debris.
- Power Plants: Continuous filtration of cooling water, boiler feed water, and turbine lubrication.
- Chemical Processing: Managing aggressive chemical streams where stopping the pump for cleaning would disrupt the chemical reaction.
- Marine & Shipbuilding: Essential for seawater cooling, ballast systems, and fuel transfer lines.
- Water Treatment: Ensuring constant filtration for desalination plants and large-scale municipal pumping stations.
Why Choose Fabricated Duplex over Simplex?
In many industrial sectors, the cost of a 15-minute shutdown to clean a strainer screen far exceeds the initial investment of a Fabricated Duplex Strainer. By choosing a duplex system, you eliminate the risk of emergency shutdowns, protect expensive downstream machinery around the clock, and significantly reduce operational labor costs.
