Duplex Cartridge Filtration Unit

The Duplex cartridge filter unit is the most commonly used cartridge filter unit in the oilfield industry. OTS offers a number of modern filtration solutions backed by quality cartidges by Dutch Filtration.

This offshore proof, skid-mounted filter unit is equipped with all necessary valves and safety features.

The Duplex offers the most cost effective way to clean-up all possible oilfield fluids. It allows you to simultaneously filter with one vessel, and easily change out the used cartridges of the other vessel.

System Design Features

  • Standard serial/ parallel configuration
  • Standard TDW 610 serial: 50 cartridges per vessel
  • Compact space saving design
  • Innovative easy push lever and easy to handle swing-away vessel lid
  • Swing-bolts and nuts for quick opening
  • Self sealing, service friendly cover gasket
  • All 4 inch valves easy to operate from the front
  • Certified hoisting slings and forklift pockets
  • Safety valve set at 7 bar (105 Psi)
  • Robust offshore frame


  • Completion fluids
  • Water injection
  • Produced water
  • Seawater intake
  • Oily water clean up
  • Diesel
  • Pre-filtration RO

Filter Unit Range

  • TDW 610-50/40 (standard)
  • TDW 610-50/40-S (single)
  • TDW 510-30/40 (standard)
  • TDW 510-30/40-S (single)
  • Other types on request

Technical Specifications

Number ofCartridges per Vessel
50 cartridges

Max. Recommended Flow
12.6 bbl/min (120 m3/hr)

Maximum Working Pressure
7 bar (105 Psi)

Maximum Working Temperature
158 °F (70 °C)

Design Code Vessels
PED (PD5500)

Design Code Frame
EN 12079

Cartridge Diameter
2.5 ” (6.35 cm)

Cartridge Length
40 ” (101.6 cm) plug in type

Vessel Diameter
24 ”(610 mm)

Pipe Size
4 ”

Material of Vessel and Piping
SS 316 L (all wetted parts)

Material Frame
Carbon steel, epoxy coated

Main Valves
4 ” Butterfly valve, NBR seat, SS disc

in/outlet pressure gauge
(0-10 bar/0-150 Psi)

Lid Seal
EPDM O-ring

Hoisting slings (certified) and forklift pockets

Vessel Lid
Lever operated swing away

In-/ Outlet
4 ” union fi g.100 inch on 4″ NPT-M

1 ” SS 316 ball valve with 1″BSP-F

1 ” SS 316 ball valve with 1″BSP-F

Pressure Relief Valve
1 ” bronze, set point 7 bar (105 Psi)

Weight (Empty)
2650 Ibs (1200 kg)

Dimensions (Lx Wx H)
7.38 x 3.94 x 6.6 ft (2.25x 1.20x 2.00 m)

Product photos

Get in touch

Do you want to know more about the possibilities? Or do you want a quick quote? Call (+47) 51 71 53 80 or send an email to post@ots.as.

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