Woodward Swift™ Gas Metering System

Introduction

This manual describes the Woodward Swift™ Gas Metering System for

micro/mini-turbines, small industrial turbines, and high-pressure fuel cell

applications. This manual provides installation instructions, product description,

troubleshooting, and specifications. This manual does not contain instructions for

the operation of the complete prime mover system. For prime mover or plant

operating instructions, contact the plant-equipment manufacturer.

Applications

The Woodward Swift gas metering system operates on micro/mini-turbines, and

small industrial turbines ranging from 30 to 2000 kW, as well as high-pressure

fuel cells (> 97 kPa/14 psig) up to 3000 kW. The Swift system has four valve

sizes with maximum fuel flows of 6 to 88 g/s (50 to 695 lb/hr) of standard natural

gas, depending on the system pressures (see Table 1-1). The system is

designed for installation in the prime mover enclosure and can accommodate gas

temperatures up to 121 °C (250 °F).

Description

The system is available in two primary configurations. The "Swift" configuration

provides either single- or dual-metering valves in a single housing. This

configuration can be integrated into a new or existing gas metering system to

provide low-cost, accurate, reliable control. The Swift Model 200 system, sizes

65. 36. and 20. have been designed to provide system mass flow accuracy of 2%

of point at 100% of rated flow across the entire temperature range. The Swift

Model 200 system, size 11. has been designed to provide system mass flow

accuracy of 6.2% of point between 50 and 100% of rated flow, across the entire

temperature range.

The Swift gas metering system components include one or two metering valves

and one valve driver (see Figure 1-1). For fuel systems requiring two

independently modulated fuel flows, the primary valve can be integrated with a

secondary metering valve. The primary valve can accommodate this integration

without duplicating either electrical or mechanical connections.