Positive-lock seal, verified at 3.5 bar
The restrainer seat is machined, not stamped, and mechanically locks the bag collar so differential pressure cannot lift it into bypass.
STRATA Series
Single and multi-bag vessels with positive-seal restrainer baskets that stop bypass — the failure mode that quietly ruins downstream equipment.
- Single-vessel throughput
- 1,100 m³/h
- Flow range
- 5 to 1
- Standard configurations
- 5
- Industries served
- 6
Overview
High dirt-holding capacity at the lowest cost per litre filtered.
Bag filtration wins on economics: a size-2 bag holds several kilograms of solids for a fraction of the cost of the equivalent cartridge area. What it loses on, in badly built systems, is bypass. A bag seal that lifts under differential pressure sends unfiltered fluid straight downstream, and nothing on the gauge tells you it happened.
The STRATA restrainer basket uses a machined snap-band seat with a positive mechanical lock, tested to hold at 3.5 bar differential — well beyond the 2.5 bar collapse point of the bag itself. The bag fails before the seal does, which is the correct order.
Multi-bag vessels are laid out with a central inlet diffuser so the first basket does not take the full solids load. In a four-bag STRATA, loading across baskets stays within 12% of one another, which means the plant changes all four bags on one shutdown instead of chasing them individually.
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Specifications
Technical envelope
- Bag sizes
- Size 1, 2, 3, 4 and size 12 extended length
- Flow range
- 5 to 1,100 m³/h per vessel
- Design pressure
- Up to 25 bar g standard, 40 bar g on request
- Design temperature
- −20 °C to +200 °C depending on media and seal
- Micron range
- 1 µm to 1,500 µm nominal; 5 µm to 200 µm absolute-rated media
- Materials
- SS 304L, SS 316L, Duplex 2205, CS with epoxy or rubber lining
- Seal options
- Snap-band, plastic flange ring, and O-ring collar
- Closure
- Eye-bolt swing, davit-assisted, or quick-lock band clamp
Configurations
STRATA-1
Single-bag housing, side inlet / bottom outlet, 5 to 40 m³/h.
STRATA-4
Four-bag multi vessel with diffuser plate, 40 to 320 m³/h.
STRATA-12
Twelve-bag high-flow vessel with davit head, up to 1,100 m³/h.
STRATA-DUP
Duplex twin-vessel skid with change-over valve for uninterrupted service.
STRATA-SAN
Sanitary bag housing, electropolished, fully drainable, clamp closure.
Advantages
What this platform does that a catalogue item does not.
Even loading across the bundle
Inlet diffusion holds basket-to-basket load variance under 12%, so all bags reach change-out together on one planned shutdown.
Two-minute change-out
Band-clamp closures, counterbalanced heads and pull-tab bag handles cut a four-bag change from twenty minutes to under five.
Full drain, no residual pocket
Sloped floors and low-point drains empty the vessel completely — critical where product changeover or CIP validation is in play.
Applications
Where it is installed
- Paint, ink and resin filtration before spray application
- Cooling-tower side-stream solids removal
- Sugar syrup and edible oil clarification
- Pre-filtration ahead of membrane and cartridge stages
- Plating bath and electrocoat particulate control
- Well-water and river-intake pre-treatment
Industries
Sectors this platform serves
Technical drawings
Issued with every order
Vessel general arrangement
Overall envelope with clearance required for head swing.
Restrainer basket detail
Perforation pattern, seat geometry and seal engagement dimensions.
Diffuser plate layout
Hole pattern and open-area calculation for multi-bag models.
Skid piping isometric
Duplex change-over arrangement with valve tag numbering.
FAQs
Questions engineers ask about bag filter systems
When the solids load is above roughly 50 ppm and the required rating is 5 µm or coarser, bags almost always win on total cost. Below 5 µm absolute, or where extractables and validation matter, cartridges take over.
Related platforms
Frequently specified alongside
Next step
Specify the bag filter systems 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