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The WOODWARD 8237-1369 is a critical piece of safety equipment, specifically a ProTech-GII Overspeed Protection Device. It is designed to ensure the safe operation of various types of turbines by preventing them from reaching dangerous overspeed conditions.
Woodward is a global leader in designing and manufacturing control systems for industries such as power generation, oil & gas, and process control. The ProTech-GII series is a specialized line of products focused on safety and redundancy for these critical applications.
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Product Overview
The WOODWARD 8237-1369 is a ProTech-GII Overspeed Protection Device that is primarily a safety system for turbines. It continuously monitors a turbine’s speed and, if the speed exceeds a preset limit, it triggers a safe shutdown. This prevents catastrophic equipment failure and enhances personnel safety.
A key feature of the ProTech-GII series is its Triple Modular Redundant (TMR) design. This means the device contains three independent modules (A, B, and C) that work together. This architecture is often used with a 2-out-of-3 voting logic, where at least two of the three modules must agree that a trip is necessary to initiate a shutdown. This design significantly improves reliability by reducing the chance of a false trip from a single module failure.
- Product Type: Overspeed Protection Device
- Manufacturer: Woodward
- Model Number: 8237-1369 (ProTech-GII Series)
- Primary Function: To continuously monitor turbine speed and safely shut down the turbine if it reaches an overspeed condition.
Detailed Product Description
The WOODWARD 8237-1369 is engineered for high reliability and integration into a wide range of industrial turbine applications. It is a panel-mount device, typically installed in a control room or equipment cabinet for easy access and visibility.
Here is a breakdown of its key features and benefits:
- Overspeed and Over-acceleration Detection: The device’s core function is to monitor speed via magnetic pickups (MPUs) or other sensors. It can be configured to not only trip on a speed limit but also on a rate of acceleration, providing an extra layer of protection.
- Triple Modular Redundancy (TMR): The system’s TMR architecture is its most significant safety feature. It consists of three independent modules that monitor the turbine’s speed. This redundancy allows for a single module to be replaced while the system remains operational, minimizing downtime.
- 2-out-of-3 Voting: This logic is a key part of the redundant design. For a shutdown command to be issued, at least two of the three independent modules must agree. This prevents a single sensor or component failure from causing an unnecessary trip, thus improving system availability.
- Integrated Testing and Diagnostics: The ProTech-GII performs automatic, routine tests to ensure that each module is functioning correctly. It also stores a log of overspeed events, sensed trips, and their associated times, which is critical for post-event analysis and troubleshooting.
- Communication: The device supports Modbus communication, allowing it to integrate with other control systems, such as a Distributed Control System (DCS) or a PLC, for remote monitoring and data logging.
- Robust and Durable Design: The internal electronics are protected by a conformal coating, making the device resistant to corrosion from gases like sulfur contamination, hydrogen sulfide (), and sulfur dioxide (), which are common in power plant environments.
Technical Specifications (General)
| Specification | Details |
| Product Type | ProTech-GII Overspeed Protection Device |
| Manufacturer | Woodward |
| Model Number | 8237-1369 |
| Input Power | Dual redundant power supply options: High Voltage (HV) and Low Voltage (LV) |
| Inputs | Speed signals from active or passive MPUs, discrete inputs |
| Outputs | Dual redundant trip relays (2-out-of-3 voted), alarm relays, 4–20 mA analog output |
| Communication | Modbus communication relays |
| Operating Temperature | -20°C to +60°C (-4°F to +140°F) |
| Dimensions | 330 x 445 x 159 mm (13 x 17.5 x 6.25 inches) |
| Features | Overspeed and over-acceleration detection, TMR design, 2-out-of-3 voting, on-line repair capability, conformal coating |
Application Areas
The WOODWARD 8237-1369 is a vital safety component in any industrial application that uses a prime mover where overspeed is a serious risk. Its primary applications include:
- Power Generation: Providing overspeed protection for steam, gas, and hydro turbines.
- Oil & Gas: Ensuring the safety of turbines used to drive compressors, pumps, or generators in refineries and on offshore platforms.
- Process Industries: Any process where high-speed rotating equipment is used, and a failure could lead to dangerous or costly consequences.
