Duplex Strainer
A duplex strainer provides continuous filtration by using two basket chambers connected via a common changeover valve. One basket remains in service while the other is isolated for cleaning, ensuring uninterrupted operation for critical processes.
How It Works
- Dual baskets allow online cleaning by switching the flow from the clogged basket to the clean one.
- Changeover valve (three-way/plug or butterfly arrangement) diverts flow without stopping the pump.
- Differential pressure across the basket indicates fouling; plan cleaning before excessive ΔP increases energy costs.
Typical Applications
- Pumps protection in water, seawater, glycol, and utilities.
- Process fluids with suspended solids where uptime is critical.
- Upstream of control valves, heat exchangers, and meters.
Material Options
- Carbon Steel (WCB) for general service.
- SS304/SS316/SS316L for corrosion resistance and hygienic utilities.
- SS904L or Duplex for aggressive chloride service.
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Materials of Construction
| Part |
Carbon Steel |
Alloy Steel |
Stainless Steel |
| Body | A216 WCB/WCC; A352 LCB/LCC | A217 WC6/WC9 | A351 CF8/CF8M |
| Cover | A216 WCB/WCC; A352 LCB/LCC | A217 WC6/WC9 | A351 CF8/CF8M |
| Changeover Valve | WCB (plug/ball/butterfly) | A217 WC6/WC9 | CF8/CF8M |
| Basket/Screen | — | — | SS304 / SS316 / SS316L |
| Blow‑off/Drain | A105 / A216 WCB | A182 F11/F22 | A182 F304/F316 |
| Studs | A193 B7 | A193 B16 | A193 B8 |
| Nuts | A194 2H | A194 7 | A194 8 |
| Gasket | Spiral wound SS316/304/321 with graphite filler |
