Definition - What does Hoisting System mean?
Hoisting System is the system used on a drilling rig to perform all lifting activities on the rig. These activities basically include the lowering and lifting of necessary equipment in or out of the hole. This system is the main component that performs the drilling operation by either lifting or lowering the casing or drill pipes to drill and finally complete the well. The major components of a Hoisting System are derrick, block & tackle system, drawworks and miscellaneous hoisting equipment like elevators, hooks and weight indicator.
An overhead crane is a type of crane found in industrial environments. It contains runways accompanying travelling bridge closing the gap. These cranes are spread over a rectangular area by moving loads backward-forward and side-to-side. A hoist, which is the lifting element of a crane, travels beside the bridge. Overhead cranes, unlike construction or mobile cranes are typically utilized either in manufacturing or in maintenance applications, in which downtime or efficiency are critical factors. The overhead lifting solutions improve efficiency, safety and productivity and diminish the environmental impacts.
Petropedia explains Hoisting System
Every drilling rig is required to have a Hoisting System that helps in either lowering or raising necessary equipment in or out of the hole. The Hoisting System consists of three major components:
- Derrick: This is a long steel tower used in the drilling rig to provide vertical height which is required to raise or lower sections of pipes into the hole. It is the most important identifiable symbol on the drilling rig.
- Block & Tackle System: This is a system in the Hoisting System that comprises of travelling block, crown block and the drilling line. They are used to provide a mechanical advantage that helps in handling large loads easily.
- Drawworks: The main operating component of the Hoisting System. They are used to transmit power from prime movers to the hoisting drum that lifts the casing, drilling string or tubing string. They also transmit power to a rotary drive sprocket that helps in driving a rotary table.
When moving extremely bulky or heavy loads through overhead spaces, overhead cranes which have great lifting capabilities are used. The movement of the crane is operated directly by an operator either with wireless controls or wired pendant station or manually. These cranes are generally used during the refinement of metals like steel, copper and aluminum. The cranes are manufactured in different configurations depending on applications:
- EOT Crane- The Electric Overhead Travelling Crane is most popular kind of overhead crane used in most factories. These cranes, as suggested by the name, are operated by radio remote pendant, control pendant or an operator cabin attached to crane itself.
- The Rotatory Overhead Crane is a kind of overhead crane that has one end of the bridge which is positioned on fixed pivot and the other end is supported on an annular track.