Block Control System (BCS)

NOV engineers combined our proven M/D Totco™ instrumentation and sensor technologies with the powerful Baylor 2025B eddy brake controller to create a closed-loop block control system (BCS) that overcomes the inherent deficiencies of traditional crown/rig floor savers and kinetic energy devices. The closed-loop control technology allows our system to constantly calculate when to apply the eddy current brake while continuously measuring the effect of the brake’s application and adjusting the force accordingly. The result is smooth, proportional control of traveling block movement.

With our BCS, absolute control of the brake is always available to the driller. The eddy current brake will instantly respond to the greater braking command—either from the driller’s control or the BCS. In the event of an auxiliary braking failure, the system actuates the manual band or disc brake as soon as insufficient braking is detected. This occurs long before the desired operating limits are exceeded.

The system is constantly monitoring the hookload and block velocity to calculate the optimum level of braking necessary to bring the block to a smooth stop as driller-programmed limits for floor, crown, and monkeyboard are approached. Necessary friction braking is applied long before eddy current braking can become inadequate. For block positioning, the system can easily be preset by the driller to stop the block smoothly at any position along its range of travel.