The process is based on two rotating concentric drums whose axis is tilted at a slight angle to the horizontal (up to 10°). The inner drum has large (10 mm) perforations and the outer drum has replaceable fine mesh panels (typically 3 mm square mesh). The circulating fluid and waste pass through a flow control device into the inner drum. The fluid passes through the perforations and meshes into a collecting tank below the drums and via this tank back to the platform mud circuit. The swarf is retained within the drums, and due to the angle of inclination and the rotation of the drum is caused to travel down the length of the drum exiting the open end and by way of a chute into waste skips for disposal. 

The equipment once set up and tuned to the flow rate of milling fluid, requires no manual operator intervention other than to replace waste skips as and when filled.

Drum tilting and rotation are achieved through a simple hydraulic system from an integral 2.2 kW electro/hydraulic power pack.

There are few points of maintenance and these are designed for ease of access. A comprehensive illustrated manual describes safety, operational adjustments, and maintenance.

Technical specifications

Drum module

  • Weight: 2250 kg
  • Length: 4000 mm
  • Width: 1500 mm
  • Height: 1900 mm

Standard tank module

  • Weight: 1500 kg
  • Length: 4200 mm
  • Width: 1500 mm
  • Height: 1700 mm
  • Capacity: 1700 mm

Operating condition

  • Weight: including 30 bbl mud @ 1.6 sg 12,000 kg
  • Length: 4200 mm
  • Width: including access platform 2410 mm
  • Height: 3800 mm
  • Footprint: 3000 mm x 1450 mm

NOTE: These dimensions and weights exclude the discharge pump, supply and discharge pipework, valves etc.

Hydraulic power pack motor

  • Rating: 2.2 kW/3.0 hp 2 pole
  • Frame: Vertical shaft, flange mounted
  • Ex rating and voltage to suit zone of operation

Hydraulic pump

  • Model: PLP 10-6.300-81 E1 – LLB/BA-N
  • Displacement: 6.2 cc/Rev

Hydraulic motor

  • Model: MGLR-125 A25
  • Displacement: 125 cc/rev

Chain drive

  • Large sprocket: 25 teeth
  • Small sprocket: 9 teeth
  • Drive ratio: 2.78:1
  • Drum speed: 8 - 12 rpm under load

Swarf separation

  • 1st stage: Perforated drum, holes Ø=12 mm
  • 2nd stage: Woven wire screens (6) 3 mm x 3 mm aperture (4 mm x 4 mm optional)
Product sheets: 
PDF icon ott_prod_srs.pdf