WOODWARD 1-9907-1978

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The WOODWARD 1-9907-1978 is a crucial safety component: a QuickTrip Electro-Hydraulic Trip Block Assembly. It’s designed for use in turbine shutdown systems, specifically for hazardous locations.

WOODWARD 1-9907-1978: QuickTrip Electro-Hydraulic Trip Block Assembly (Zone 1 & 2)

The WOODWARD 1-9907-1978 is a highly specialized and independent safety system. It’s engineered to provide rapid and reliable shutdown capabilities for steam, gas, and hydro turbines. This assembly is a key element in preventing catastrophic overspeed events or other dangerous conditions by quickly dumping hydraulic trip oil.

Product Overview

This part number designates a specific configuration within Woodward’s highly respected QuickTrip series, which is designed to act as an independent layer of protection, separate from the main turbine control system.

• Product Type: Electro-Hydraulic Trip Block Assembly / Safety Shutdown System Component
• Manufacturer: Woodward
• Part Number: 1-9907-1978
• Model Designation: QuickTrip
• Safety Integrity Level (SIL): This model is SIL-3 certified (IEC 61508/61511 compliant). This signifies a very high level of safety integrity, meaning it’s suitable for the most critical safety functions where a dangerous failure is highly improbable.
• Hazardous Area Rating: The “1-” prefix specifically indicates certification for Zone 1 & 2 hazardous locations. This means it can safely operate in environments where flammable gases, vapors, or mists may be present under normal operations (Zone 1) or occasionally (Zone 2). It features chemically resistant seals.
• Function: When activated by a trip signal (e.g., from an overspeed detection system, emergency stop, or process interlock), this assembly rapidly vents (dumps) the hydraulic pressure from the turbine’s trip oil header. This sudden loss of pressure causes the turbine’s steam or fuel valves to close immediately, initiating an immediate and controlled shutdown of the prime mover.
• Hydraulic Pressure Range: It is designed for use with low-pressure (5–25 bar / 73–363 psi) hydraulic trip oil headers.

Detailed Product Description

The Woodward 1-9907-1978 QuickTrip Electro-Hydraulic Trip Block Assembly is engineered for maximum safety and reliability in the most demanding industrial environments. Key features and characteristics include:

• SIL-3 Certification: Compliance with IEC 61508/61511 standards at SIL-3 ensures the system meets stringent requirements for safety-critical applications where failure could lead to severe consequences.
• Independent Operation: It’s designed to operate independently of the primary control system, ensuring that a malfunction in the main governor or DCS won’t compromise the safety shutdown function.
• Fast Trip Times: A critical feature for any trip system, this assembly boasts very fast response times, typically with solenoid action in less than 50 milliseconds, ensuring rapid valve closure.
• Dirt-Tolerant Design: Woodward’s patented “Dirt-tolerant design” is a significant advantage, particularly in hydraulic systems where oil contamination can be an issue. It features no orifices to plug, a self-cleaning valve design, and a high “rotary chip shear force” (e.g., 25 lb), which helps prevent common failures caused by contaminated oil.
• Increased Reliability (2-out-of-3 Voting): The QuickTrip typically incorporates a 2-out-of-3 voting design for its internal components (e.g., solenoids). This means that a single component failure will not cause a false trip (nuisance trip) and also prevents a single point of failure from disabling the safety function. This significantly increases system availability and reliability.
• Online Repair and Testing: A major benefit of this design is its ability to be repaired and tested online without requiring a full shutdown of the turbine. This feature is crucial for maintaining high uptime in power generation and process industries.
• API-670 Compliant: It meets API-670 compliance, which is a widely recognized standard for machinery protection systems in the petroleum, petrochemical, and natural gas industries.
• Local & Remote Position Indications: It provides local indications (e.g., bright position indication LEDs: run & trip) and remote indications (via integrated limit switches for safety system and plant DCS status and health validation) to show its current status and position.
• Compact Size: Designed to be compact, minimizing trip header piping and related system delays when located near the turbine and trip & throttle valve.

Technical Specifications (for the 1-9907-1978 QuickTrip Trip Block)

Parameter	Value
Product Type	Electro-Hydraulic Trip Block Assembly
Manufacturer	Woodward
Part Number	1-9907-1978
Model Series	QuickTrip
Safety Integrity Level (SIL)	SIL-3 certified (IEC 61508/61511 compliant)
Hazardous Area Rating	Zone 1 & 2 (with chemically resistant seals)
Function	Rapidly dumps hydraulic trip oil to initiate turbine shutdown
Input Signal	Electrical trip signal from a safety system
Output	Hydraulic pressure dump (to close turbine valves)
Trip Oil Pressure	5–25 bar (73–363 psi)
Trip Time (Solenoid Action)	< 50 milliseconds
Key Features	Dirt-tolerant, 2-out-of-3 voting, online repairable/testable
Compliance	API-670
Operating Temperature	Typically –40 °C to +85 °C (–40 °F to +185 °F)
Applications	Steam, gas, and hydro turbine shutdown systems in hazardous locations
Reference Documentation	QuickTrip Electro-Hydraulic Trip Block Assembly Product Manual (e.g., Manual 35035)

Typical Applications

The WOODWARD 1-9907-1978 QuickTrip Electro-Hydraulic Trip Block Assembly is indispensable in any industrial setting where the safe and rapid shutdown of high-speed rotating machinery is critical, especially in potentially hazardous environments:

• Power Generation Plants: Essential for protecting large steam turbines, gas turbines, and hydro turbines in thermal, combined cycle, and nuclear power plants.
• Oil & Gas Industry: Used on turbines driving compressors or generators in refineries, pipelines, and offshore platforms, where Zone 1 & 2 hazardous atmospheres are common.
• Chemical and Petrochemical Processing: Protecting turbines and engines in plants where hazardous, flammable, or corrosive materials are present and a quick, reliable shutdown is paramount for safety.
• Marine Propulsion: Ensuring the safe operation of marine turbines and large engines.