WESTLOCK CONTROLS CORPORATION
280 MIDLAND AVENUE, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.westlockcontrols.com
5/05/12 TECH-461/D.W.O. 19909 Page 8 of 24
The equipment contains communication devices. Any changes or modifications made to the
equipment without the written consent of WESTLOCK, and its resellers or distributors, can
nullify the user's authority to operate this equipment.
The user assumes all risks associated with the use and handling of the equipment, and
specifically acknowledges that WESTLOCK, and its resellers or distributors, will not be liable for
any damages of any kind, including personal injury or property damages resulting from use of
the equipment.
1.7 System Principles of Operation
1.7.1 Introduction
The Westlock Wireless Valve Monitoring System, or Westlock WVMS, provides real-time
information about the status of valves. The data is fed directly into the customer’s control
system thereby reducing failure while increasing safety and yield. The WVMS is based on the
ZigBee Pro standard protocol and serves as an add-on layer, over traditional process
management systems, providing enhanced monitoring capabilities, with considerably reduced
complexity. The WVMS includes support for a wide range of standard interfaces, physical and
logical, that are common in the industry. This makes the WVMS, from the perspective of
connectivity, almost transparent for system designers and integrators, since they can easily
integrate the WVMS into any of the most widely-used system architectures in the process
industry.
The Westlock Wireless Valve Monitoring System has the following main functionalities:
Manual Valve Operation Monitoring: Many process valves are activated manually by
field operators who receive instructions from the control room. Such manual processes are
vulnerable to human error and can result in substantial damage and poor yield. The WVMS
provides the plant with an efficient, cost-effective solution to monitor installed devices.
Actuated Valve Operation Monitoring: Although actuated process valves are activated
remotely, many do not have any feedback on the operation and, in cases of actuation
failure, a false perception of the valve position may be reported. The WVMS complements
the actuated operation with a full monitoring feedback.
Actuated Valve Maintenance: Wear and tear of actuated valves can result in a broken
shaft (causing an excessively fast response), or in shaft deterioration that slows down the
valve's movement. The dynamic profile of actuated valves during transactions must
consistently remain within a pre-set range. Whenever these limits are breached, an alarm is
generated.
Partial Stroke Monitoring: Static valves that remain in the same position for long periods
of time may lose their operational flexibility. To facilitate periodic “instruction” of such a
valve to move, the Partial Stroke Test (PST) is initiated, either by the control system or
manually. Valve positioning monitoring allows such a PST to be recorded and stored for
audit and evidence.
To Next Page
Loading...
