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The WOODWARD 9904-800 is a mechanical-hydraulic speed droop governor primarily used for controlling steam turbines. It’s part of the TG-17 Screw (TG17S) series, known for its robust and reliable mechanical operation.
WOODWARD 9904-800: Mechanical-Hydraulic Speed Droop Governor (TG-17S, 2400 rpm, CW Rotation)
The WOODWARD 9904-800 is a self-contained, mechanical-hydraulic control device crucial for the stable operation of steam turbines, especially those driving critical equipment like pumps, compressors, or generators where precise, constant-speed (isochronous) operation is not the primary requirement. It offers a straightforward and dependable method for speed control.
Product Overview
The 9904-800 constantly monitors the turbine’s rotational speed and adjusts the turbine’s steam admission valve to maintain a set speed, based on the principle of speed droop.
- Product Type: Mechanical-Hydraulic Speed Droop Governor
- Manufacturer: Woodward
- Series: TG-17S (Screw-operated)
- Application: Small to medium steam turbines.
- Key Feature: Speed droop control (not isochronous).
- Rated Speed: Designed for operation at 2400 rpm.
- Speed Setting Mechanism: Screw-operated (for fine, manual adjustment).
- Drive Shaft Rotation: Clockwise (CW) rotation.
- Output: 16 N·m (12 ft-lb) rotary output.
- Environmental Certification: ATEX certified (suitable for potentially explosive atmospheres).
- Rated Speed @ 2° Droop: 1950 rpm (a specific configuration point for droop, indicating how much speed drops for a given load increase).
Detailed Product Description
The WOODWARD 9904-800 provides a reliable and cost-effective solution for steam turbine speed control. It’s a member of the venerable TG-17 governor family, known for its durability and simple, yet effective, mechanical operation.
Here’s how it works and what sets it apart:
- Mechanical-Hydraulic Operation: This governor is a self-sufficient unit. It uses a drive shaft-driven ball head assembly to sense the turbine’s speed. An internal, shaft-driven oil pump generates the hydraulic pressure needed to actuate the power cylinder, which in turn controls the turbine’s governor valve. This design reduces reliance on external electronic components for its core function.
- Speed Droop Control: The 9904-800 operates on the speed droop principle. This means that as the load on the turbine increases, its speed will slightly decrease proportionally. This characteristic is often beneficial in applications requiring load sharing among multiple prime movers or where a slight, predictable speed variation due to load changes is acceptable.
- Direct Turbine Interface: The governor directly connects to the steam turbine’s rotor or an auxiliary shaft to obtain speed input. Its rotary output shaft then directly links to the turbine’s steam admission valve, precisely managing the steam flow.
- Designed for 2400 rpm: This specific model is configured for turbines operating around 2400 rpm. This speed capability is important for matching the governor to the operational characteristics of the prime mover.
- Screw-Operated Speed Setting: The “S” in TG-17S signifies that the speed setpoint is adjusted via a screw mechanism. This provides a precise and stable method for operators to fine-tune the desired turbine speed, which is typically preferred for applications that don’t require frequent or rapid speed changes.
- Clockwise (CW) Rotation: The 9904-800 specifically features a clockwise drive shaft rotation and output shaft rotation. This is a critical mechanical detail that ensures proper integration with the turbine’s drive train.
- Robust and ATEX Certified: Built to withstand demanding industrial environments, these governors feature a rugged construction and a self-contained oil sump. The ATEX certification confirms its suitability for use in potentially explosive atmospheres, which are common in many industrial plants.
- Work Capacity: The governor’s output terminal shaft delivers a substantial 16 N·m (12 ft-lb) of rotary work capacity, sufficient for operating various types of turbine governor valves.
In summary, the 9904-800 is a reliable, robust, and ATEX-certified mechanical-hydraulic governor, ideally suited for steam turbine applications operating around 2400 rpm that require precise screw-based speed adjustment and a clockwise drive shaft rotation.
Technical Specifications (General)
Typical Applications
The WOODWARD 9904-800 is commonly found in industrial settings utilizing small to medium steam turbines for mechanical drive or power generation, especially in situations where:
- Speeds are around 2400 rpm: Ideal for turbines operating within this speed range.
- Speed Droop Control is Adequate: For applications where load sharing or slight speed variation with load changes is acceptable.
- Mechanical-Hydraulic Simplicity is Preferred: When a robust, self-contained mechanical governor is favored over more complex electronic systems.
- Precise, Infrequent Speed Adjustment: Where the screw-based speed setting offers sufficient control.
- Clockwise Rotation: The turbine’s mechanical drive interface specifically requires a CW rotating governor.
- Common Use Cases Include:
- Pumps: Controlling steam turbines that drive various process pumps.
- Compressors/Turboexpanders: Regulating the speed of steam turbines used to drive compressors in chemical plants, refineries, or gas processing facilities.
- Generators: Controlling the speed of steam turbines connected to generators for power generation, often in parallel with other power sources.
- Fans: Managing steam turbines that power large industrial fans in power plants or other heavy industries.
