Product category:
Gas monitoring and analysis
News Release from: Emerson Process Management | Subject: X-Stream on VRU
Edited by the Processingtalk Editorial
Team on 30 October 2007
Gas analysers for vapour recovery units
Emerson is providing Rosemount Analytical X-Stream Process Gas Analysers to Roplex Engineering, a leading UK provider of Vapour Recovery Units and services to petroleum distribution terminals
These Rosemount Analytical X-Stream analysers will monitor the VRU effectiveness and provide additional levels of safety The explosion proof, dual channel XStream infrared analysers are being used to measure carbon monoxide and butane, monitoring the effectiveness of the VRU in removing all the hydrocarbons and thereby adding additional levels of safety at terminals
This article was originally published on Processingtalk on 30 Dec 2002 at 8.00am (UK)
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"A prime consideration for these applications is accuracy and reliability," said John Robson, managing director of Southampton based Roplex Engineering.
"We used to purchase cheaper analysers that used electrochemical sensors, but we find that the proven X-Stream infrared technology provides a superior solution, something our customers will readily acknowledge".
VRUs have long been installed on petrol tanker loading terminals in response to legislation limiting the amount of hydrocarbon vapours that can be emitted to the atmosphere.
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When tankers arrive at the refuelling points they are empty of fuel but full of air saturated with vapour, up to 40% by volume.
As the tanker is filled, the expelled vapour is collected and fed to a VRU where the hydrocarbons are removed before the air is vented to atmosphere.
A typical VRU has two scrubbers both containing activated carbon.
Installed in parallel, the scrubbers are routinely switched.
One adsorbs the hydrocarbons and then, once saturated, the beds switch and the hydrocarbons are removed and returned to liquid form.
The X-Stream analysers detect carbon monoxide in the gas exiting the adsorber bed--a presence of the gas provides an early indication of an upset condition that has the potential to become a hazard.
The second measurement, butane, is made on the final vent-to-atmosphere to ensure that the VRU is working effectively.
The X-Stream analysers utilise appropriate non-dispersive infrared (NDIR), ultraviolet (UV) spectroscopy as well as paramagnetic and thermal conductivity detectors when needing to detect oxygen, carbon monoxide, carbon dioxide, hydrogen, or other gases.
X-Stream analysers offer single or dual channel analysis and provide real-time control to help customers fine-tune their processes for increased productivity and profitability.
With EExd Flameproof or EExp ATEX certification the X-Stream Analyser is rated to IP66/NEMA4X for field mounting and is suitable for operating temperatures from -20 to +50C.
A 19inch rack mounting version is also available. Request a free brochure from Emerson Process Management ...
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