Posi-Stop Plus System

Posi-Stop Standard System

The Posi-Stop is an independent system that does not interfere with existing drilling control systems or electronics and can be used on all Service Rigs (including live shaft draw works), and Production Rigs including Mechanical, SCR and DC powered rigs. The Posi-Stop block limit control system can be turned off without interrupting rig operation. If preset upper or lower block limits have been exceeded, a solenoid-operated pneumatic valve is actuated, the drawworks clutches and throttle are disengaged, the drawworks brake is applied, and a red limit light is illuminated. The brake is released and throttle and clutch control is restored when the red bypass switch is pressed. An amber warning light indicates when the block is within 5% of the upper or lower limit. An audible alarm also sounds when the blocks are at the 10% and 95% position and sounds progressively faster as the blocks approach the lower or upper limit.

For Top Drive rigs the Posi-Stop can add an interface with the Top Drive console to indicate when the Top Drive unit is in an unsafe position to travel through the pipe platform zone. The Posi-Stop is configured to add an “Intermediate” Zone where the block will be stopped if the Top Drive is in an unsafe position.

The Posi-Stop System can include a block speed control function to prevent the block from over running the upper and lower limits. Certain speed and load conditions can cause the block to over run the limits even with the brake engaged due to inertia. In addition, if the block travel speed exceeds a pre-set speed at 85% of travel going up, the throttle control can be shut off. This signal can be supplied to the SCR panel on an electric rig or to the throttle control on a diesel engine rig. The red limit light flashes if the speed limit is exceeded in either direction. In addition, the audible alarm sounds three times at the 30% position in the down direction and at 70% in the up directions.

Block speed is calculated by the Posi-Stop and if pre-set speed vs position limits are exceeded, a relay is activated at 90% or 95% when the block is moving up, and at 15%, 10% or 5% when the block is moving down. This relay will provide a signal to the auxiliary brake to engage when activated. This is usually connected to a Baylor type brake control but can also interface with a hydromatic brake or a disk brake. The Posi-Stop monitors the draw works RPM and if the RPM is above a preset value at the specified block position, the auxiliary brake is engaged then is released when the RPM decreases below the set minimum. This provides a reduced block momentum at the upper or lower limit set point.

Data acquisition and transmission capabilities are available that capture all operating parameters from the Posi-Stop system and transmit these data via satellite or cellular network for later retrieval and analysis via the Internet. Position Tracking Systems provides this remote monitoring and reporting service through “Rigseye”.

Complete Posi-Stop Plus System Kit includes:

• Posi-Stop Plus Console
• Encoder (Prox Switches or Standard Encoder) to determine speed and block position by counting rotations of the draw works drum
• Encoder Connecting Cable (including connector)
• Electronic Load Pin with wiring harness
• Digital Weight Gauge with connecting cable and protective enclosure
• Solenoid Valve Assembly (Not pictured) to release air supply to clutch and throttle

Complete Standard Posi-Stop System Kit includes:

• Encoder (Proxy Switches or Standard Encoder) to determine speed and block position by counting rotations of the draw works drum
• Encoder Connecting Cable (including connector)
• Solenoid Valve Assembly (Not pictured) to release air supply to clutch and throttle

Remote monitoring system that communicates with the Posi-Stop and the rig’s ECM to collect data that is sent over the internet to allow remote users real time access to the rigs activity. Please download this file for more information.

Rigseye System Presentation

The Dynamic Brake System is a pneumatic/spring activated brake system that works alongside the mechanical brake linkage. By welding a stop on the brake equalizer shaft (or using a key stop), an actuator installed on the equalizer shaft is rotated by the brake chamber when energized that will then activate the band brake. The actuator is free to rotate on the equalizer shaft, which allows the mechanical brake linkage to freely rotate the shaft. Additional benefit is if air pressure supplied to the brake system is low or lost then the spring in the brake chamber will activate the brake.

A Brake Handle can be added to this brake to allow the operator to operate the brake chamber with a handle mounted at the end of the brake lever. This allows the operator to maintain contact with the brake lever and use wrist to operate the brakes to lower fatigue.

“Deadman” Brake is a lever mounted on the handle that must be held down to allow normal operation of the drawworks. If contact is not made on the lever then the brake is set and air flow to the throttle is stopped.

Dynamic Brake System Kit includes:

• Brake Chamber
• Brake Chamber Harness
• Shaft Spacers
• Actuator Arm and Actuator
• Weld Stop
• Rod Clevis with Pin
• Park Brake Assembly
• Brake Handle Assembly (Optional)
• “Deadman” Brake Assembly (Optional)

The Standard Brake System works by applying air to a cylinder that either pushes or pulls a shaft that is connected to an actuator on the equalizer shaft of the band brakes. This will rotate the equalizer shaft and thus closing the band with the brake pads around the drum. The “Posi-Stop” system applies the brakes when limit conditions are met by activating a solenoid valve that opens the air circuit to the air cylinder.

Standard Brake System Kit includes the following:

• Air Cylinder
• Rear Clevis Mount
• Rod Clevis
• Actuator
• Half Moon Actuator Stop