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Through large amounts of on-site tests, the crown saver unit was put into use on since 2004. At present, they are also mounted on mechanical rigs and various workover rigs.
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The crown saver unit keep monitoring speed and direction of the travelling block while it is travelling up and down. A safe curve is store in the unit, thus if speed and height of travelling block exceed the top margin while moving up, the unit can automatically decelerate speed of the TB and then set brake if height of the TB exceeds up allowable limit. This is a two step design, firstly decelerate the TB when it detect unsafe speed at certain height and trigger visual and audible alarm simultaneously, secondly set the drum brake if height exceed up margin, which can significantly lower the overshoot and also avoid drilling lines jump out of groove in result of sudden brake.
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Meanwhile, when the travelling block is lowering down, speed and height is aso monitored by the unit to avoid touch-down.
BOP interlock function is also available accidently pull-to-break the string joints while bop is closed.
Main features:
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- Continuous monitoring and control for travelling blocks system according to travelling block’s height, running speed and directions.
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- Prejudging, pre-alarm, preprocessing for potential security problem
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- Set safety running curve according to various height and speed. Soft stop and soft landing by forewarning and pre-deceleration
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- The bop status display and interlock function
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- Backup power control to prevent the protection function failure caused by blackout.
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- System is simple, lightweight, quick plugging interface, ease of installation.
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- Wide voltage and frequency design, suitable for various rigs.
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- Degree of protection: IP56
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- Explosion-proof: meet the requirement of explosion-proof area
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- Response time: 100ms
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- Certification: CCS, ATEX
