crown block

crown block

[′krau̇n ‚bläk]
(petroleum engineering)
A wooden or steel beam joined to the tops of derrick posts of an oil well to support pulleys.
References in periodicals archive ?
Derricks and mast are used in oilfield drilling rigs to support the crown block and the drill string used during drilling a wellbore.
Coeur will be focused on a quick restart of the Sterling Mine while aggressively exploring the highly prospective Crown Block and other targets.
On the other end of the spectrum, the original Arrow Crown block contains 89 patches, making it a great candidate for discovering Hidden Blocks; I discovered over 30.I started simplifying this block from the outside in, and then got creative with my changes, as seen below.
Once you get comfortable with the above fairly straightforward changes, you can cut loose as with the Arrow Crown block.
Number of Blocks & Finished Size 9 Sawtooth Star Blocks 12" x 12" 9 King's Crown Blocks 12" x 12"
Parts include, but not limited to mud pumps, drawworks, traveling blocks, hooks, swivels crown blocks and deadline anchors.