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Telescopic crane

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The above presentation is about telescopic crane, it's working principle and it's financial viability O&O costs.

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Telescopic crane

  1. 1. Introduction • These are truck cranes that have a self contained telescoping boom. • Telescoping boom contains a number of tubes fitted one inside other. • Can travel on public highways. • Once the crane is leveled at the new worksite it is ready to work without setup delays. • If job require crane utilization for few hours to a couple of days, telescopic crane should be given first consideration because of it’s ease of movement.
  2. 2. Manufactures • Porclain • JCB • Escorts • ACC • Hitachi • Rolex • Hyundai • Apex • Ace
  3. 3. Work Cycle Loading Elevating Unloadin Driving Steering g
  4. 4. Working Principle L L A B • To lift the load A, force B should be applied at equal distance on the other end. (B>A)
  5. 5. A B’ L l
  6. 6. Concept in cranes • In cranes, the force A is the load to be lifted. • Force B is the force applied i.e. counterweight. (counterweight also contains fixed pulley block on which the cable is wrapped) • The pulley system delivers a force to the load that is equal to the applied force multiplied by the length of cable (boom) between the load lifted and counterweight. • This is known as Mechanical advantage. • So we can say that, load lifting capacity of any crane depends on the length of the boom.
  7. 7. Specifications Extension boom Fixed boom Cable Counterweight Hook hydraulic Cabin Outrigger
  8. 8. Dimensions
  9. 9. Machinery
  10. 10. Operation cycle timing • Boom Raising : 27 sec. • Boom Lowering : 20 sec. • Telescopic In : 8 sec. • Telescopic Out : 14 sec. • Hoist Line Speed : 52 m/min. • Steering : 7 sec.
  11. 11. Economy Before using or buying an equipment owner should answer two question?? 1- how much does it cost to operate the machine on a project ? 2- what is the optimum economic life and the optimum manner to secure a machine ? The reason to purchase an equipment maybe to generate profit . • Upon deciding there are two costs associated the construction equipment • ownership cost • Operation cost • Generally know as O&O costs • Suppose $90/hr and a production of 300 tons/hr so production cost would be $90/h/300 tons /hr
  12. 12. Problem 14 Telescopic crane costs 325000 USD service life is 15 years Per hour ownership cost = 2.471 USD each year it should work= 2500 hours Yearly ownership= 2166.32 USD Rental options Monthly: 6500 USD Weekly: 2500 USD Daily : 695 USD Rental Duration Rates Hours Rental Rate $/hr Operating hours Break even 2166.32 point Operating hour break even point 6500/hr Monthly 6500 216 30 72 - Weekly 2500 83 30 72 216 Daily 695 23 30 72 216
  13. 13. Ownership cost • Purchase expense • salvage value • tax saving from depreciation • Major repairs and overhauls • property taxes • insurance • Storage and miscellaneous
  14. 14. Operating cost • Fuel • Lubricant, filters and grease • Repairs • Tires • Replacement of high-wear items
  15. 15. Thank you

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