Difference Between Derrick and Crane
Derrick and cranes are types of lifting machines. The Derrick, is used primarily in construction, the loading and unloading of cargo ships and dredging operations is usually stationary engines mounted on stiff legs, the column or attached to the wall, and often held in place by a rope guy. Lifting hook it hangs from one end of the liquidity boom, the other end is attached to a pivot support mast. Hoisting ropes and pulleys raise, lower and move the boom from side to side, and thus load moves. (Derrick term is also applied to the rigid tower erected over the drill holes to reach reservoirs of oil. The Derrick supports the rigging that raises and lowers the drill pipe .) The boom of a crane is called a “jib” when it is connected to a fixed, horizontal position,it is always stationary in relation to the tower. Cranes range in size from small wall jib cranes for self-propelled or truck-mounted machine with steel Lattice work booms, some extremely long. A crawler crane is mounted on a vehicle that moves on the crawler or caterpillar, tracks. The tower cranes used in construction of tall buildings is a rigid, vertical towers of steel beams and held in position by a rope guy. A Steel Lattice work jib on the top of the tower supports the load lifting rigging. The stress alone costs of traveling crane catches the underside of the horizontal member at a standstill, like bridge building. The gantry crane looks like overhead crane, except that its legs are mounted on tracks. Too-heavy load of high crane can cause it to topple. A crane’s designated capacity is the weight, which is safe to lift that is placed from a distance from the center of the rotation.