Drawworks Disc Brakes 22 DUAL BRAKES FOR GREATER SAFETY. This is actually a dual braking system.  The hydraulic circuits for the driller's side and the off-driller's side service caliper assemblies are completely independent. ADDITIONAL BACK-UP. The air-operated back-up hydraulic pump supplies hydraulic fluid at approximately the maximum system pressure to operate the brake in the unlikely event of a primary pump failure. ACCURATE CONTROL. The driller can control the main service brakes to a fine degree. Sensitive operations are accomplished with ease. ELECTRONIC REMOTE CONTROL PACKAGE. With the growing trend to remove the operation of the drilling func- tion to enclosed areas and driller’s cabins, National Oilwell can now offer the ability to electronically control the drawworks functions. Whether use of an existing band brake or with a disk brake system, the interface of the drawworks controls can be safely operated through the electronic control package. ELECTRONIC JOYSTICK CONTROLS. Safely remove the driller from harsh environments and offer precise control of all of the drawworks functions. TOUCH SCREEN, MENU DRIVEN. With the provision of electronic driller’s control screen, every func- tion and operation of the drawworks is displayed for ease of opera- tion and can also provide warning signals to prevent dangerous conditions and limits. SYSTEM COMPATIBLE. The National Oilwell electronic remote control package can inter- face with other rig floor systems to provide a reliable, safe and inte- grated system. With the installation of the National Oilwell electronic drawworks controls, the driller can be assured the operation of the drawworks is performing to the safe design limits and capabilities of the equipment. TOTAL PACKAGE. With the addition of the Energy Monitor and Autodriller System a complete package which provides not only operator interface, but additional safety features to maintain safe and reliable operation in harsh environments. CREW SAFETY AND OPERATION LIMITS. When the Energy Monitor System is in operation, the preset limits of safe operation are continuously monitored.  If ever these limits are approached, the Energy Monitor System warns the operator of approaching limits.  The system automatically applies braking func- tions when these limits are exceeded to bring the equipment safely under control. AN IMPORTANT OPTION. To take full advantage of the benefits afforded by the Universal Disc Brake System, National Oilwell offers an integrated PLC based Energy Monitor and Autodriller System.  This system ensures that the maximum kinetic energy of the traveling equipment is not exceeded, while monitoring the position of the traveling equipment within preset limits of travel.  It also provides precise control of bit weight when drilling. The automatic drilling system is designed to relieve the burden of constant actuation of the controls by the driller.