Crown Block

The crown block is a stationary part of the traveling system for drilling rig, and is installed on the head of the drilling derrick. The crown block is used in the oil and gas field to solve problems of supporting tools or casing pipes, and also for various technological and hoisting operations when drilling wells. Includes one or more rollers mounted on a single frame installed on the crown block platform of the tower. Drilling crown block include:

Crown block axis
Crown block frame
Pulley sections
Auxiliary pulleys
Safety cover

Crown Block for drilling rig

Crown blocks of drilling rig are available with lifting capacity from 30 to 675 tons. The crown block is lifted onto the tower in assembled form with the auxiliary and tartar blocks installed. Auxiliary blocks for the cable coming from the auxiliary winch or other special devices are suspended from the crown block frame. The pulley sections consist of axles mounted on bearings, clamped on the axle, locked with a screw, followed by installation of cotter pins in the groove of the nut. The pulley sections are covered with casings on top. The top end of the guide for the top drive system is also attached to the crown block frame.

Technical Parameters for Drilling Crown Block

Model	Ropes	Wire rope dia. in	Load lbf	Main pulley dia in	Fast line dia. in	Bailing wheel dia. in	Overall dimension ft	Dead weight lbs
TC60	3x2	7/8	134885	19.68	19.68		5.37x4.36x4.89	1305
TC70	4x3	7/8	157366	24.02	24.02		4.86x2.05x2.07	1598
TC90	4x3	1	202328	24.02	24.02		4.46x3.28x4.10	1764
TC135	4x3	1	303492	29.92	36.02		6.09x4.95x4.27	2866
TC158	5x4	1 1 1/8	355198	29.92	36.02	19.68	7.64x4.69x4.82	3263
TC158	6x5	1 1 1/8	355198	29.92	36.02	19.68	7.64x5.38x4.82	3472
TC160	4x3	1 1/8	359694	36.02	36.02	19.68	7.23x3.23x3.41	4393
TC180	6x5	1 1/4	404656	36.02	36.02		8.14x2.70x3.18	4574
TC225	6x5	1 1/4	505820	36.02	36.02	19.68	6.56x4.59x4.43	5158
TC315	7x6	1 3/8	708148	50	60	30	12.84x9.67x9.24	19294
TC450	7x6	1 1/2	1011640	60	60	29.92	11.38x10.06x9.73	21459

Technical Features for Drilling Crown Block

The crown block will be manufactured in accordance with API Spec 4F and 8C.
Each bearing of the crown block has an individual lubrication channel.
The crown block frame is made of high-strength steel materials.
Bearings and pulleys on the crown block are possibly interchangeable within the limits corresponding to the traveling block.
Crown block grooves are filled for increased service life
Rope stops are installed to prevent ropes from falling out of the groove.
The crown block is equipped with wooden buffer blocks and fixing mesh.
The crown block is equipped with tartar rope crown block pulleys and auxiliary pulleys.

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