Product category:
Valves and manifolds
News Release from: Emerson Process Management | Subject: WhisperFlo
Edited by the Processingtalk Editorial
Team on 29 April 2004
Fisher valve system to upgrade LNG
facility
An order to replace existing propane and mixed refrigerant compressor anti-surge valves for an LNG facility in Brunei has been met with a Fisher optimised anti-surge system, increasing efficiency
Fisher optimised anti-surge system will protect liquefied natural gas compressors, increase efficiency, and reduce risk Emerson Process Management recently received an order to replace all existing propane and mixed refrigerant compressor anti-surge valves for an LNG facility in Brunei
This article was originally published on Processingtalk on 30 May 2005 at 8.00am (UK)
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The 25 existing valves will be replaced by the Fisher optimised anti-surge control valve system.
This major upgrade will protect compressors, increase efficiency, and enable monitoring for predictive maintenance that reduces risk of operations downtime.
The 12-inch through 30-inch valves in the Fisher optimised anti-surge system include custom designed multi-path, multi-stage WhisperFlo noise abatement trim that can reduce noise by up to 40 dBA.
The heart of the system is in the actuation.
It reduces the number of actuation accessories typically found in anti-surge valves by over 50 percent.
This improves operating performance and reduces start-up and commissioning times.
Tuning time is reduced from 12 hours with conventional anti-surge valves to 30 minutes with the Fisher optimised system, as a result of the reduced number of accessories and the Fieldvue valve controller.
The Fisher valves will open in less than two seconds to protect the compressors from anti-surge conditions.
Not only will the valves open quickly; they are designed to meet stringent closed-loop control criteria.
Linearity of the control signal is held to within 0.75% and is designed so the valve will have minimal overshoot in the open and closed directions.
The actuator is installed with a cushioning feature that provides a controlled deceleration into the travel stops, preventing damage that can occur when a heavy valve plug is moved from one stop to the other.
Because the anti-surge valves are critical to plant operation, their performance will be monitored on-line.
Diagnostic information can be collected, viewed and analysed in real time without shutting down the valve or disturbing the process.
A simple red, yellow or green light diagnostics-driven indicator identifies potential problems.
If an alert is triggered, the problem, potential causes and recommended actions are displayed, allowing the site to schedule maintenance rather than wait for a failure to occur.
More information is presented on this and other case histories involving anti-surge valves, available from the local Emerson sales office. Request a free brochure from Emerson Process Management ...
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