A HAZARDOUS ROAD TO SUCCESS
Chromatotec have established themselves in the Forefront of Sulphur Analysis in Hazardous Areas.
Their latest Enhancement of their MEDOR range has Augmented their Rapid Rise in this Expanding Market
Most natural gas production and exploitation sites are considered to be hazardous areas. This is certainly the case when it comes to Liquefi ed Petroleum Gas (LPG) sites. It is vital to avoid creating any areas, within the sites, in which the atmosphere contains fl ammable gas. The need to comply to stringent safety and environmental regulations and the associated cost and constraints associated with compliance, need to be factored in, when calculating a site’s profi tability.
Natural gas is a natural resource present on the earth which can vary in composition depending on the location of its extraction. In order to maximise the use and value of natural gas, it is necessary to control its composition. Even if it is composed mainly of methane, natural gas contains some traces of Sulphur compounds which can affect its quality as well as having dramatic effects during its transportation (for example: pipe corrosion). Therefore, companies that work with natural gas need to control the level of Sulphur compound impurities, as well as adding specifi c Mercaptans to make it odourant and easily detectable in cases of leakage.
For over 30 years, Chromatotec® has manufactured the MEDOR®
instruments, which are based on gas chromatography principles, to measure H2
S, all Mercaptans, Sulphides, Tetrahydrothiophene (THT) and Total Sulphur in natural gas or gaseous fuels. Thanks to
LNG Terminal application the advantages of the “MEDOR”® technology and its ubiquitous
deployment in the USA, American customers have defi ned a new guideline based on the solution: ASTM D7493-08 “Standard Test Method for Online Measurement of Sulphur Compounds in Natural Gas and Gaseous Fuels by Gas Chromatograph and Electrochemical Detection”.
As the MEDOR® analyser only needs between 5 to 60 mL/min
of nitrogen or zero air to operate, the development of an ATEX solution was a catalyst in expanding Chromatotec’s®
position
in the hazardous areas market. It all started in 2009 with the development of an ATEX and CSA certifi ed Purge solution to operate in hazardous areas zone I and II. Chromatotec®
managed
to overcome the main limitation, which is the use of an important fl ow of purge gas (from 30 to 60 L/min of nitrogen or air) which is not always available on site. The second phase, which started on January 2017, was to develop and produce an ATEX solution using a “d” type enclosure which does not need any purging gas. This solution can be implemented in area zone I and II depending on each customer’s specifi c needs.
H2
S TS Thermal Powerplant Application
This solution was developed, whilst keeping in mind the need to attain the certifi cations necessary for the various different parts of the world – such as CSA for North America. Now Chromatotec®
the only manufacturer to provide Sulphur analysers developed to require only 5 to 60 ml/min of zero air or nitrogen for operation including internal automatic calibration. In addition MEDOR® instrumentation technology is some of the most sensitive that is capable of detecting without pre-concentration and without any convertor down to 1 ppb of individual Sulphur compounds.
Other technologies require at least two gases to operate and/ or a convertor to convert Sulphur compounds into H2
S or SO2 Medor ex CSA – Odorization site in USA
depending on the detector. It can be a problem for some operators to use hydrogen cylinders in hazardous areas, the risk of leaks prohibits their use. Convertors are not 100% effi cient for all compounds and the effi ciency decreases over time which creates potentially critical errors of measurement.
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