EXECUTION OF ZONE CLASSIFICATION FOR TEST SITE
We offer all types of classification
Eltronic FuelTech offers all types of classification in areas such as Methanol tank yards and fuel/gas supply systems where flammable gas, vapour or mist may occur.
The classification is used to support the proper selection and installation of equipment for use in hazardous areas.
Based on initial drawings and the yard layout, an initial analysis is made to identify the requirements of walls and safe distances outside the access openings as well as changes in the initial design that may be needed in order to decrease the size of the hazardous (explosive) area surrounding the yard.
We follow classification procedures
1) Identification of the characteristics for the media used:
• Relative density to atmospheric air
• Lower and upper explosive concentration limit (LEL/UEL).
• Gas type, minimum ignition energy, flash point etc.
2) Identifying possible sources of release and the grades of release under normal operation conditions. Flange connections, valves etc. are a possible source of release.
3) Calculation of possible release rates from different sources of release
4) Calculation of ventilation rate, movement of air and its replacement with fresh air due to the effects of wind, temperature gradients or artificial means
5) Definition of ventilation availability:
• Good: ventilation is present and virtually continuous.
In an outdoor area, the ventilation is considered as good.
• Fair: ventilation is expected to be present during normal operation.
• Poor: ventilation which does not meet the standard of fair or good ventilation.
6) Calculation of zone and zone extent, using media data, release rate and ventilation rate.
7) Preparation of graphical zone plan of the hazardous area from calculations and zone definition:
• Zone 0: an area in which an explosive gas atmosphere is present continuously or for long periods or frequently.
• Zone 1: an area in which an explosive gas atmosphere is likely to occur under normal operation.
• Zone 2: an area in which an explosive gas atmosphere is not likely to occur under normal operation but, if it does occur, will persist for a short period only.
Classification according to EN/IEC 60079 series standards
Selection and installation of proper equipment for use in hazardous areas
All components have been selected according to the actual placement and the zones as indicated on the zone plan, with respect to the component certificates.
When the zone is classified as Zone 1, the used component must at least be suitable for Zone 0 or 1 and the gas type.
Verification of components before first use
Prior to first use, all components placed in a hazardous area must go through an inspection to ensures that replaceable items are of the correct type and rating.