A QUICK GUIDE TO OVERHEAD CRANE TERMINOLOGY


TYPES OF CRANES:

 

JIB CRANES:

FLOOR MOUNTED

O'Brien Jib CranesBEST FOR:
  • Loads under 40,000Lbs
  • Small areas, up to 65′ of reach
  • Loading and Unloading of machines
  • Workstations with one or two workers
  • Can be slewed (turned) electrically

 

WALL MOUNTED:

BEST FOR:O'Brien Tie-Rod Jib Crane
  • Loads up to 20,000Lbs
  • Small areas, up to 48′ of reach
  • Low duty cycles
  • Workstations
  • Usually not slewed electrically

 

BRIDGE CRANES

TOP RUNNING SINGLE GIRDER (TRSG)TRSG Low Headroom Overhead Crane19

BEST FOR:
  • Loads up to 40,000Lbs
  • Spans up to 80 ft
  • Light to moderate duty cycles
  • Low to moderate speeds

 

 

 

Top Running Double Girder (TRDG)Double Girder Overhead Crane

BEST FOR:
  • Loads up to 500,000Lbs +
  • Spans up to 150 ft +
  • Light to heavy duty cycles
  • Low to high speeds

 

 

 

 

Under Running Single Girder (URSG)Underslung-Crane-Under-Running-Crane

BEST FOR:
  • Loads up to 20,000Lbs
  • Spans to 80 ft
  • Light to moderate duty cycles
  • Low to moderate speeds
  • Applications where floor space is at a premium

 

 

 

 

 

Under Running Double Girder (URDG)under-running-double-girder-crane-large

BEST FOR:
  • Loads up to 40,000Lbs
  • Spans to 120 ft
  • Light to moderate duty cycles
  • Low to moderate speeds
  • Applications where floor space is at a premium

 

 

 MONORAILwhite crane

BEST FOR:
  • If material being lifted does not have to transfer out of a certain path.
  • To get material out of tight spaces
  • Loads up to 55,000Lbs
  • Low to moderate speeds
  • Low to moderate duty cycles

 

 

TYPES OF HOISTSliftket chain

CHAIN HOIST:

Best For:

  • Loads up to 55,000Lbs
  • Light to moderate duty cycle
  • Low to medium speeds
  • Applications with tight dimensional requirements

 

 

 

 

WIRE ROPE HOISTS:hi temp

Best For:

  • Loads to 630 tonnes
  • Light to heavy duty cycle
  • Low to high speeds
  • Normal or extreme environments

 

Commonly used terms:

  • Hoist: The portion of a crane that does the lifting of the load.
  • Trolley: The structure that supports the hoist.
  • End Truck: The part on a bridge crane that has the drive wheels in it and supports the girder.
  • Bridge Girder:  The beams on a bridge crane that connect the two end trucks and on which the hoist/ trolley assembly runs.
  • Conductor Bar/ Downshop Conductors: The power bar that most often runs along the runway and feeds power to one or multiple cranes.
  • Festoon System: The sliding power cable system that feeds power to the hoist/ trolley from the main power source.
  • Pendant: Enclosure with push button controls in it to control crane functions.
  • Duty Cycle: A term used to describe how much use a crane gets, see Table 1.
  • Contactor control: An electric motor starting method whereby full voltage and frequency is applied to a motor in order to start it rapidly.  Characterized by quick starting and stopping of the motor.
  • Inverter Control: An electric motor starting method whereby voltage and frequency to a motor are gradually ramped up from min to max.  Characterized by smooth and gradual starting and stopping of the motor.

 

Crane Components

FEM HMI ISO CMAA EXAMPLES/ APPLICATIONS
1Cm H1 M2 A STANDBY OR INFREQUENT SERVICE0-2 Lifts per hour

-Used only occasionally

-Very light use

-Rarely lifts to capacity

-Slow speeds

-Should only be specified in very rare instances

-Maintenance hoists for turbines / motors / pumps

1Bm H2 M3 B LIGHT SERVICE2-5 Lifts per hour

-Occasional use

-Light maintenance and service use

-Sometimes lifts to capacity

1Am H3 M4 C MODERATE SERVICE5-10 Lifts per hour

-Light but steady use on one shift

-Average load is 50% capacity or less

-Moderate speeds

2m H4 M5 D HEAVY SERVICE10-20 Lifts per hour

1-2 shifts

-50% capacity loads are common

-Higher speeds

3m H4 M6 D HEAVY SERVICE10-20 heavy lifts per hour

-2 shifts

-Often has dead load below hook

-Capacity loads are common

4m H5 M7 E SEVERE SERVICE-20+ heavy lifts per hour

-2-3 shifts

-Has heavy dead load below hook

5m H5 F CONTINUOUS SEVERE SERVICE-30+ at or near capacity loads per hour

-24/7 operation

-shut down only for maintenance

Table 1

 

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