Explosion Protection Equipment From The Explosive Atmosphere Experts
Published 21 Sep 2016
- By Chris Dodds : estimated reading time 3 minutes
Hazardous Area Knowledge & Experience
All T&D Sales Engineers hold CompEx Certificates (Hazardous Awareness Course EX F) and undertake advanced and ongoing Explosion Protection training with suppliers – we can be safely trusted to specify and supply Electrical, Mechanical, Process & Instrumentation Equipment for use in hazardous areas and explosive atmospheres.
The CompEx Certificates were awarded following successful completion of the course and written examination at Roxby Training Solutions Ltd, a UK Approved Licensed CompEx Centre.
Details of forthcoming Hazardous Area Training courses are available here, Book A Course.
The CompEx Scheme is now the global solution for validating core competency of employees and contract staff of major users in the gas, oil & chemical sectors, both with offshore and onshore activities – designed and developed by industry for industry.
Terry McDonald (Thorne & Derrick Business Development Manager – Hazardous Area Industries) commented on the training, “The CompEx Foundation course delivered by Roxby Training Solutions Ltd was well received by the candidates.
The course was excellently presented by a knowledgeable instructor who has a wealth of experience working within Hazardous Areas.
The topics covered reinforced our employees’ current knowledge and bridged the gaps where required. With candidates being certificated in the ExF unit of the CompEx scheme, it has instilled greater confidence that Thorne & Derrick can continue to provide the support to customers.
Overall we were very pleased with the standard of training received and wouldn’t hesitate to recommend Roxby Training Solutions Ltd services.”
Hazardous area topics covered reinforced our current knowledge and filled in the gaps. Keith helped give a genuine appreciation of the dangers and consequences of failure to comply with ATEX regulations and although ultimate responsibility lies with the end user, T&D can continue to support our customers in the knowledge that we are competent to EX F Foundation in Hazardous Awareness level and have a very sound understanding of hazardous areas, protection concepts and DSEAR/ATEX regulations.”
Explosion Protection Types
Ex i Intrinsic Safety
Type of Explosion Protection Ex ‘i’ is a protection type in which the energy available in the hazardous area is limited to a level below that which could ignite a flammable atmosphere.
Ex i intrinsic safety is the traditional electronic explosion protection where the power supply to electrical equipment is fed through a safety barrier (Shunt Diode Safety Barrier or Galvanically Isolated Barrier) that limits the current and voltage so that the minimum ignition energy and ignition temperature of an explosive mixture cannot be reached.
Ex ‘i’ Definition: a type of explosion protection in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions.
Temperature classifications T1 to T6 have been introduced for hazardous area equipment – the equipment is assigned to a temperature class according to its maximum surface temperature. The temperature classes are:
|Temperature Class||Max Equipment Surface Temperature||Ignition Temperature Of Combustible Substances|
Ex e Increased Safety
Type of Explosion Protection Ex ‘e’ is a protection type where the occurrence of sparks and impermissable temperatures that could act as a source of ignition is prevented through additional mechanical protective measures.
Type Ex e protection requires an Ingress Protection minimum of IP 54. Ex e increased safety equipment, conforming to the requirements of the ATEX Hazardous Area Directive, is marked to indicate conformity with the Directive. The explosion protected equipment should also be marked with the requirements of the international hazardous area standard (eg IEC 60079-7).
- IEC 60079-7: Explosive Atmospheres – Part 7: Equipment Protection By Increased Safety “e”
For more information, refer to the relevant standards, EEMUA 186 – A Practitioners Handbook.
Ex ‘e’ Definition: a type of explosion protection in which additional measures are applied so to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions.
Ex d Flameproof Enclosure
Type of Explosion Protection Ex ‘d’ is a protection type where electrical equipment is installed in a flameproof enclosure to ensure that possible sparks cannot escape. The electrical components that could trigger ignition are built into an enclosure that will withstand the pressure of an explosion – the openings of the enclosure are designed and manufactured to prevent the explosion from escaping the enclosure.
Ex ‘d’ Definition: a type of explosion protection in which the parts that can ignite an explosive atmosphere are placed in an enclosure that can withstand the pressure developed during an internal explosion of an explosive mixture and which prevent the transmission of that explosion to the explosive atmosphere surrounding the enclosure.
Ex p Pressurized Enclosure
Type of Explosion Protection Ex ‘p’ is a protection type where electrical equipment and controls are installed in an enclosure that is constantly kept under slight overpressure with nitrogen or a nonexplosive gas to prevent penetration by flammable gases. The equipment enclosure in filled with an inert gas and an explosive gas mixture cannot get to the possible sources of ignition that are arranged on the inside of the enclosure.
Ex ‘p’ Definition: a type of explosion protection using the technique of guarding against the ingress of the external atmosphere into an enclosure by maintaining a protective gas therein at a pressure above that of the external atmosphere. Protection by pressurisation is subdivided into 3 explosion protection types (px, py and pz) which are selected based upon the external explosive atmosphere, the potential for an internal release and whether the electrical equipment within the pressurised enclosure is ignition capable.
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