WOODWARD 9904-815

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The WOODWARD 9904-815 is a mechanical-hydraulic speed droop governor specifically designed for controlling steam turbines, similar to the 9904-814. It’s often used as a replacement or upgrade for older TG-13 governors in certain applications.

WOODWARD 9904-815: Mechanical-Hydraulic Speed Droop Governor for Steam Turbines

The WOODWARD 9904-815 is a robust, self-contained control device essential for the reliable operation of small to medium-sized steam turbines, particularly those driving pumps, compressors, or generators where a precise, constant-speed (isochronous) operation isn’t the primary requirement.

Product Overview

The 9904-815 functions as a mechanical-hydraulic governor. It continuously senses the turbine rotor speed and compares it to an internal setpoint. Based on this comparison, it precisely adjusts the turbine’s governor valve to regulate the inlet steam flow, thereby controlling the turbine’s speed.

• Product Type: Mechanical-Hydraulic Speed Droop Governor
• Manufacturer: Woodward
• Application: Small to medium steam turbines (e.g., driving pumps, compressors, generators).
• Key Feature: Speed droop control (not isochronous).
• Drive Shaft Rotation: Clockwise (This is a key differentiator from the 9904-814, which is counterclockwise).
• Output: 16 N·m (12 ft-lb) clockwise rotary output terminal shaft.
• Speed Set Range: Typically 1200-2400 rpm (may vary slightly by specific configuration).
• Environmental Certification: Designed for hazardous locations (HAZLOC) and ATEX certified.

Detailed Product Description

The WOODWARD 9904-815 provides a reliable and cost-effective solution for steam turbine speed control. It’s frequently referenced as a modern equivalent or replacement for older TG-13 governors, offering similar core functionality but with updated design elements or certifications.

Here’s a breakdown of its features and how it functions:

• Mechanical-Hydraulic Operation: This governor is a self-contained unit that senses turbine speed using an integrated driveshaft-driven ball head assembly. An internal, driveshaft-driven oil pump generates the necessary hydraulic pressure to create the force required to move and control the turbine’s governor valve. This mechanical-hydraulic design makes it inherently robust and minimizes reliance on external electronic components for its core speed sensing and actuation.
• Speed Droop Control: The 9904-815 operates on a speed droop principle. This means that as the load on the turbine increases, its speed will slightly decrease (or “droop”) proportionally. This characteristic is often desirable in applications where load sharing among multiple prime movers is needed, or where a slight, predictable speed variation under load changes is acceptable.
• Direct Turbine Connection: The governor directly couples to the steam turbine’s rotor or an auxiliary shaft to sense the turbine’s speed. Its rotary output terminal shaft directly connects to the turbine’s governor valve, precisely controlling the inlet steam flow.
• Key Differentiator: Clockwise Drive Shaft Rotation: Unlike its counterpart, the 9904-814 (which has counterclockwise rotation), the 9904-815 features a clockwise drive shaft rotation and a clockwise output terminal shaft rotation. This is a critical specification for ensuring compatibility with the mechanical drive configuration of the specific steam turbine it will control.
• Rugged Construction: Built for harsh industrial environments, the 9904-815 features weatherproof construction and a self-contained sump. Its design is suitable for operation in demanding conditions, including those found in HAZLOC and ATEX certified areas, making it suitable for potentially explosive atmospheres.
• Typical Speed and Output: The governor typically has a screw speed set range of 1200-2400 rpm. Its output terminal shaft delivers a significant 16 N·m (12 ft-lb) of rotary work capacity, which is sufficient to operate various turbine governor valves.

The 9904-815 provides a reliable and cost-effective solution for applications where a robust, self-contained mechanical-hydraulic governor with speed droop characteristics and a clockwise drive/output rotation is required for steam turbine control.

Technical Specifications (General)

Typical Applications

The WOODWARD 9904-815 is primarily used in industrial settings that employ small to medium steam turbines for mechanical drive or power generation, especially where constant-speed operation isn’t mandatory and where the turbine’s mechanical interface requires a clockwise rotating governor shaft:

• Pumps: Controlling steam turbines that drive process pumps in various industries.
• 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 where they might operate in parallel with other power sources or grid connections that can absorb speed droop.
• Force and Induced Draft Fans: Managing steam turbines that power large industrial fans in power plants or other heavy industries.
• Shipbuilding Industry: Used in marine applications for controlling steam turbine-driven auxiliary machinery.