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The height of many of the trees is tremendous and their crowns block the sky.
The segment of drilling line from the draw-works to the crown block is called the "fast line".
King Of The Hill: Stand on the crown blocks to gain your team points.
The line then exits the last sheave on the crown block and is fastened to a derrick leg on the other side of the rig floor.
The combination of the traveling block, crown block and wire rope drill line gives the ability to lift weights in the hundreds of thousands of pounds.
The drilling line then enters the sheaves of the crown block and is makes several passes between the crown block and traveling block pulleys for mechanical advantage.
The wire-rope drilling line winds on the drawworks drum and extends to the crown block and traveling blocks, allowing the drill string to be moved up and down as the drum turns.
A crown block is the stationary section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite and above the traveling block.
In a drilling rig, the drill line is a multi-thread, twisted wire rope that is threaded or reeved through the traveling block and crown block to facilitate the lowering and lifting of the drill string into and out of the wellbore.
A low rumbling sound came from underground, and then, with a force that shot 6 tons of 4-inch (100 mm) diameter pipe out over the top of the derrick, knocking off the crown block, the Lucas Gusher roared in and the Spindletop oil field was born.
