Collapse rating is calculated, not assumed
Reinforcement ring spacing is derived from open-area ratio and basket length for the actual duty, then proof-tested to 3.5 bar minimum.
GUARD Series
Simplex, duplex and Y-type strainers with reinforced baskets that survive the surge event rather than collapsing into the impeller.
- Open area to pipe area ratio
- 8:1
- Perforation
- 0.8 mm to 12 mm; mesh linings from 20 to 400 mesh
- Standard configurations
- 5
- Industries served
- 6
Overview
The last line of defence for every pump on the plant.
A strainer basket has one job on its worst day: hold together when a slug of debris arrives at full line velocity. Most collapse failures are not media failures — they are the perforated cylinder buckling because the reinforcement ring spacing was chosen from a catalogue rather than calculated.
GUARD baskets are designed to a 3.5 bar collapse differential as standard, with ring spacing derived from the actual open-area ratio and basket length. Where the duty warrants it, we specify a heavy-duty variant rated to 7 bar.
The duplex configuration uses a single-lever transflow valve that transitions between chambers without interrupting flow and without a momentary dead-head. On critical pump-protection duty this is the difference between a planned basket clean and an unplanned shutdown.
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Specifications
Technical envelope
- Line sizes
- ½" to 48" — ANSI 150# to 900#, DIN PN10 to PN100
- Perforation
- 0.8 mm to 12 mm; mesh linings from 20 to 400 mesh
- Open area ratio
- Minimum 4:1, standard 8:1 relative to pipe cross-section
- Collapse rating
- 3.5 bar standard, 7 bar heavy-duty reinforced
- Materials
- SS 304/316L, Duplex 2205, CS, bronze, Alloy 20, titanium
- Design temperature
- −45 °C to +400 °C
- Types
- Simplex, duplex transflow, Y-type, T-type, temporary conical
- Drain & vent
- Standard on all sizes 2" and above
Configurations
GUARD-S
Simplex basket strainer with quick-open cover for routine pump protection.
GUARD-D
Duplex strainer with single-lever transflow valve, zero-interruption change-over.
GUARD-Y
Y-type inline strainer for compact installations and steam service.
GUARD-T
Fabricated T-type for large-bore pipelines up to 48 inches.
GUARD-AUTO
Motorised self-cleaning variant with scraper and purge valve.
Advantages
What this platform does that a catalogue item does not.
Uninterrupted duplex change-over
The single-lever transflow valve crosses over without a dead-head instant, protecting pumps that cannot tolerate a flow interruption.
Baskets that survive cleaning
Rolled-and-welded perforated sheet with a formed rim withstands repeated pressure-washing and manual scraping without distortion.
Low permanent pressure loss
An 8:1 open-area ratio keeps clean-condition pressure drop under 0.1 bar at rated flow, so nothing is stolen from the pump curve.
Applications
Where it is installed
- Suction-side protection for centrifugal and positive-displacement pumps
- Debris removal on seawater and cooling-water intakes
- Nozzle and spray-header protection
- Heat exchanger and plate-pack inlet guarding
- Pipeline commissioning and start-up screening
- Control valve and instrument protection on steam lines
Industries
Sectors this platform serves
Technical drawings
Issued with every order
Face-to-face dimensions
Installed envelope by line size and pressure class.
Basket construction detail
Perforation, mesh lining and reinforcement ring positions.
Transflow valve schematic
Duplex flow paths in both service positions.
Pressure drop curves
Clean and 50%-loaded conditions across the flow range.
FAQs
Questions engineers ask about basket filters & strainers
For liquid duty, a minimum of four times the pipe cross-sectional area, and preferably eight times. Below 4:1 the strainer becomes a restriction in its own right and blinds unacceptably fast.
Related platforms
Frequently specified alongside
Next step
Specify the basket filters & strainers for your duty.
Send flow, contaminant, rating, chemistry and available pressure. We return a configuration with the sizing basis attached.
Or call +91 79 4890 2200 · sales@worldasatech.com