WOODWARD 9904-816

الوصف

The WOODWARD 9904-816 is a mechanical-hydraulic speed droop governor specifically designed for controlling steam turbines, similar to the 9904-814 and 9904-815, but with a different rated speed and drive shaft rotation. It is also an ATEX-certified component.

WOODWARD 9904-816: Mechanical-Hydraulic Speed Droop Governor

The WOODWARD 9904-816 is a robust and self-contained control device crucial for the reliable operation of small to medium-sized steam turbines. It’s particularly suited for applications where precise, constant-speed (isochronous) operation isn’t the primary requirement, but rather stable speed control with a defined droop characteristic.

Product Overview

The 9904-816 operates 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: Counterclockwise (CCW) rotation.
• Rated Speed: 2400 rpm (nominal).
• Rated Speed @ 2° Droop: 1950 rpm (a specific configuration point for droop).
• Output: 16 N·m (12 ft-lb) rotary output.
• Environmental Certification: ATEX certified (suitable for potentially explosive atmospheres).

Detailed Product Description

The WOODWARD 9904-816 offers a reliable and cost-effective solution for steam turbine speed control. It’s often associated with the TG-13 series governors, serving as a modern equivalent or replacement in certain configurations.

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

• Mechanical-Hydraulic Operation: This governor is a self-contained unit. It 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 9904-816 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.
• Specific Rotation and Speed: The 9904-816 features a counterclockwise (CCW) drive shaft rotation and is designed for a nominal speed of 2400 rpm. The “Rated Speed @ 2° Droop = 1950 rpm” indicates a specific operating point for its droop characteristic. These specifications are crucial for ensuring compatibility with the mechanical interface of the specific steam turbine it will control.
• Rugged Construction and ATEX Certification: Built for harsh industrial environments, the 9904-816 features weatherproof construction and a self-contained sump. Its design is suitable for operation in demanding conditions and is ATEX certified, making it appropriate for use in potentially explosive atmospheres common in oil & gas, petrochemical, and power generation industries.
• Output Work Capacity: The governor’s 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 9904-816 provides a reliable and cost-effective solution for applications where a robust, self-contained mechanical-hydraulic governor with specific speed and rotation characteristics is required for steam turbine control.

Technical Specifications (General)

Typical Applications

The WOODWARD 9904-816 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 the turbine’s mechanical interface requires a counterclockwise rotating governor shaft and a 2400 rpm nominal speed:

• 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.