The Duplex cartridge filter unit is the most commonly used cartridge filter unit in the oilfield industry. 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)