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Proceedings Paper

Valve health monitoring system utilizing smart instrumentation
Author(s): Scott L. Jensen; George J. Drouant
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Paper Abstract

The valve monitoring system is a stand alone unit with network capabilities for integration into a higher level health management system. The system is designed for aiding in failure predictions of high-geared ball valves and linearly actuated valves. It performs data tracking and archiving for identifying degraded performance. The data collection types are: cryogenic cycles, total cycles, inlet temperature, outlet temperature, body temperature, torsional strain, linear bonnet strain, preload position, total travel, and total directional changes. Events are recorded and time stamped in accordance with the IRIG B True Time. The monitoring system is designed for use in a Class 1 Division II explosive environment. The basic configuration consists of several instrumentation sensor units and a base station. The sensor units are self contained microprocessor controlled and remotely mountable in three by three by two inches. Each unit is potted in a fire retardant substance without any cavities and limited to low operating power for maintaining safe operation in a hydrogen environment. The units are temperature monitored to safeguard against operation outside temperature limitations. Each contains 902-928 MHz band digital transmitters which meet Federal Communication Commissions requirements and are limited to a 35 foot transmission radius for preserving data security. The base-station controller correlates related data from the sensor units and generates data event logs on a compact flash memory module for database uploading. The entries are also broadcast over an Ethernet network. Nitrogen purged National Electrical Manufactures Association (NEMA) Class 4 Enclosures are used to house the base-station.

Paper Details

Date Published: 10 May 2006
PDF: 8 pages
Proc. SPIE 6222, Sensors for Propulsion Measurement Applications, 62220F (10 May 2006); doi: 10.1117/12.668497
Show Author Affiliations
Scott L. Jensen, NASA (United States)
George J. Drouant, NASA (United States)

Published in SPIE Proceedings Vol. 6222:
Sensors for Propulsion Measurement Applications
Valentin Korman, Editor(s)

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