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CFA » HR 420-800 CFA

Main specs overview

  • Model name
  • HR 420-800 CFA
  • Category
  • CFA
  • Max Torque
    (KNm)
  • 420
  • Max Diameter
    (mm)
  • 1.500
  • Max Depth
    (m)
  • 27 + 8 = 35
  • Weight
    (ton)
  • 120 - 135

More details

Description

The  HR 420-800 is our largest model, which has been specially designed and built for carrying out works requiring large bore diameters at great depths. 
This one of a kind drilling rig can be equipped with different rotarys with different torque values depending on your job requirements. The rotary can also be set up with the MCS (MAIT Casing System) or torque multiplier which can exert  a maximum nominal torque of 800 KNm for insertion and extraction on the casing tubes up to a maximum diameter of 3000 mm . 
The HR 420-800 is not limited to the conventional kelly bar drilling system, but it is able to utilize  Casing Oscillators, Continuous Flight Auger (CFA), Diaphragm Walls by kelly bar system, and Driven piles with hydraulic hammers.  The HR 420-800 is also available with a crowd winch system (THD), which allows a longer stroke along the length of the mast, therefore longer casing sections may be used when drilling.

Technical data

Rotary
Nominal torque available 280 - 360* - 420* KNm 206,500 - 265,500* - 309,800* lbsft
Nominal pullback 250 KN x 4 = 1.000 KN 56,250 lbs x 4 = 225,000 lbs
Nominal pulldown 35 KN x 2 = 70 KN 7,900 lbs x 2 = 15,800 lbs
Stroke 27.000 mm 89 ft
Winches
1st winch nominal pullback 250 -300 - 400* KN 56,200 - 67,500 - 90,000* lbs
2nd winch nominal pullback 120 - 180 KN 27,000 - 40,500 lbs
Engine
Brand CATERPILLAR
Model C15
Power 403 KW @ 2.100 rpm 540 HP @ 2,100 rpm
Hydraulic system
Hydraulic oil tank 1.000 lit 264 gal
fuel tank 600 lit 159 gal
Crawler
length 6.400 mm 21 ft
width 3.500 - 5.100 mm 11.5 - 17 ft
shoes 1.000 mm 3.3 ft
weight
approx weight 135 ton 297,700 lbs
* on rquest

Working characteristics

Works with Continuous Flight Auger
Max Diameter 1.500 mm 5 ft
Depths 27 + 8 = 35 m 88.5 + 26.5 = 115 ft

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