WOODWARD 5466-318

Description

Product Overview

WOODWARD 5466-318 is a digital speed switch / frequency monitoring module developed by Woodward for prime mover overspeed and underspeed protection applications. This module is designed to monitor rotational speed from magnetic pickups or proximity sensors and provide relay outputs at programmed speed setpoints. WOODWARD 5466-318 is part of the ProTech series of overspeed protection devices and is widely used on steam turbines, gas turbines, hydro turbines, and large reciprocating engines where independent, redundant overspeed protection is required by API 670 and ISO 10437 standards. The module is extensively deployed in power generation, oil and gas, marine propulsion, and industrial compressor applications worldwide.

Technical Specifications

WOODWARD 5466-318 features the following technical specifications:

• Function: Triple modular redundant overspeed detection system

• Input Channels: 3 independent magnetic pickup/proximity sensor inputs

• Input Frequency Range: 1 Hz to 15 kHz

• Sensitivity: 100 mV RMS minimum, 30 V peak maximum

• Setpoints: 2 per channel (overspeed + auxiliary), independently programmable

• Accuracy: ±0.1% of full scale

• Response Time: <20 ms from overspeed condition to relay trip

• Output Relays: 3 trip relays (1 per channel) + 1 common alarm relay

• Relay Contacts: 2 Form C (DPDT) per trip relay, 10 A at 250 V AC / 30 V DC

• Voting Logic: 1oo1, 2oo2, 2oo3 selectable

• Diagnostics: Continuous self-test, sensor fault detection, relay coil monitoring

• Communication: Modbus RTU (RS-485/RS-232) optional

• Power Supply: 18–32 V DC or 88–264 V AC/DC (model dependent)

• Mounting: Panel mount, NEMA 4X / IP66 enclosure option available

• Operating Temperature: -40°C to +70°C

• Vibration: 5g, 10–150 Hz

• Certifications: ATEX, CSA, IECEx, SIL-3 capable per IEC 61508

A defining characteristic of WOODWARD 5466-318 is its Triple Modular Redundant (TMR) architecture. Three independent measurement channels with dedicated processors and power supplies continuously monitor speed and vote on trip conditions, enabling the module to tolerate any single component failure without nuisance tripping while maintaining full protection capability.

Advantages & Features

WOODWARD 5466-318 represents the industry standard for high-integrity overspeed protection. Key advantages include:

• SIL-3 Capable: Certified for safety instrumented functions up to SIL-3 per IEC 61508

• Fault Tolerant: TMR architecture with 2oo3 voting eliminates single points of failure

• Sensor Independence: Each channel uses dedicated sensor—common mode failures are eliminated

• Comprehensive Self-Testing: Automatic online testing detects latent faults without process interruption

• Flexible Voting: Selectable 1oo1, 2oo2, or 2oo3 logic optimizes availability vs. safety

• API 670 Compliance: Meets or exceeds all applicable requirements for turbomachinery protection

For facilities operating critical turbomachinery, WOODWARD 5466-318 provides the highest level of overspeed protection integrity available. The combination of TMR architecture, comprehensive diagnostics, and SIL-3 certification makes it the preferred choice for both new installations and safety upgrades of existing equipment.

Application Examples

Typical applications for WOODWARD 5466-318 include:

• Steam Turbines: High-integrity overspeed protection for utility and industrial steam turbine generators

• Gas Turbines: Emergency overspeed shutdown for pipeline compressors and power generation turbines

• Hydro Turbines: Speed monitoring and overspeed protection for Kaplan, Francis, and Pelton units

• Reciprocating Engines: Critical speed monitoring for large bore gas engines and diesel generators

• Turboexpanders: Overspeed protection for cryogenic expansion turbines in LNG plants

A major North American pipeline operator recently standardized on WOODWARD 5466-318 for overspeed protection across 45 gas turbine compressor stations. The decision followed a comprehensive reliability assessment that documented zero spurious trips and zero dangerous failures across 2.5 million operating hours of installed base data. The operator reported that the module’s 2oo3 voting logic reduced unnecessary turbine trips by 94% compared to their previous dual-channel systems.

Competitive Comparison

Primary competitors to WOODWARD 5466-318 include Amot 4410, Metrix IT531, and GE Speedtronic overspeed protection modules. Comparative analysis:

WOODWARD 5466-318 maintains distinct advantages in fault tolerance and safety integrity certification. While competitive products offer adequate protection for many applications, the TMR architecture and SIL-3 capability of the 5466-318 make it the preferred choice for the most critical, high-hazard turbomachinery installations where maximum safety and maximum availability are both essential requirements.

Selection Recommendations & Precautions

1. Model Verification: WOODWARD 5466-318 is a specific model within the ProTech product family. Verify that this exact part number matches your application requirements. The 5466 prefix indicates TMR architecture; 5465 indicates dual-channel architecture.

2. Power Supply Configuration: WOODWARD 5466-318 is available with 18–32 V DC or 88–264 V AC/DC power supply options. Confirm power source compatibility before ordering.

3. Sensor Selection: For new installations, Woodward recommends dedicated passive magnetic pickups for each channel. Active proximity sensors require additional signal conditioning and may reduce overall system reliability.

4. Voting Logic Selection: 2oo3 voting provides maximum availability with full safety integrity and is recommended for most applications. 1oo1 may be appropriate for non-critical service; 2oo2 provides additional safety but reduces availability.

5. Proof Testing: Periodic proof testing is required to maintain SIL certification. Woodward provides detailed proof test procedures and recommended intervals (typically 1-5 years depending on application).

6. Spare Parts Strategy: Given the critical nature of overspeed protection, maintain minimum one spare WOODWARD 5466-318 per five installed units. Woodward maintains 24-hour emergency shipment programs for critical spares.

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