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  • Technique of coal mining and gas extraction without coal pillar in multi-seam with low permeability
    BSM1002-E concrete pump from Putzmeister, which consists of an explosion - proof electric machine, hydrau- lic power unit , spiral feeder, a water distribution mixing system and hydraulic cylinder delivery system, is chosen.
  • Materials Handling Handbook 2nd Edition Complete Document
    Other special power units: NEMA-rated power units ( explosion proof ), temperature-rated power units , and other configurations. .... supply lifts without power units and supply the displacement required so an existing hydraulic system (if pressures…
  • Top-Drive Drilling Systems: Electric vs. Hydraulic-A Technical Overview and Comparison
    By virtue of the hydraulic motor being explosion proof the hydraulic Top Drive does not require any purge systems as is the case of the electric powered machine. .... It's cooling fluid is hydraulic oil, which requires heatexchangersto be relocated from the unit itself to the…
  • New Approach for Installing Welded Conductors on Platforms Without Interrupting Adjacent Drilling and Production Operations
    The hydraulic power unit for the conductor jack assembly consists of an electric-motor-driven pump providing 64 gpm at a maximum pressure of 2000 psi. .... The electrical components of the power unit are all explosion proof .
  • Modernizing Offshore Control Systems
    driven by certified explosion proof charge controllers do not produce. .... installed in Hydraulic Power Units energy during the day light hours.
  • Research of novel water cooling jacket for explosion-proof motor
    increasing of power and decreasing of volume, the electromagnetic loads selection in the calculation of electromagnetic scheme becomes higher, which is bound to make motor heating increase.so hydraulic pressure should be increased to take the surplus heat away. .... The motor cannot be drawn out from the motor unit because of deformation of its water jacket .... Water jacket of mining explosion - proof motor is thinner and lower strength because of the dimensional limit.
  • Decommissioning of High Torque Threaded Drilling Riser at World Record Break Out Torques of 257,000 ft-lbs
    This rotation is achieved by three parallel driven hydraulic motors located on the tong casing, which transfers the mechanical power to turn the rotary gear in either direction. .... Remote operation and positioning of the mechanized 21-300 was made possible using the control system, which is an explosion proof portable PLC unit and a Universal Remote Control System (URCS), making possible sequenced operation of the tong and integration into the…
  • Light Weight Proofing Roller (LWPR)
    The Pearson Light Weight Proofing Roller (LWPR) is primarily designed to detonate and neutralise mines and buried pressure-activated explosive devices ahead of the host vehicle - particularly of the heavy tracked variety. .... Hydraulic power is used to transfer a proportion of vehicle weight onto the roller wheels to generate the push down force necessary to detonate explosive devices which may be present. .... The system is comprised of three roller units which cover the entire width of the vehicle.