The substances and materials produced and processed within the petrochemical plants pose a constant risk to the environment and the people who work there.
Oil and gas, processed in the petrochemical industry, are naturally combustible and, consequently, the risk of explosion and fire in these places is very high.
The distinction between "petrochemical processes" and "refinery processes" lies in the destination of the products obtained: the products obtained from the refining of crude oil, in fact, are intended for the production of energy (i.e. they are used as fuels), while the products of the petrochemical industry are used as materials in other downstream processes.
Oil and gas are extracted, transported, stored and refined in extremely difficult conditions.
Explosion-protected products must not only be able to offer maximum reliability and high performance, but must also resist heat, cold, humidity, vibrations and shocks. Day after day, they must continue to operate with minimal maintenance requirements.
The Oil & Gas industry is divided into several segments: onshore, offshore, transport and storage, gas and LNG processing.
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In intrinsically safe systems, associated equipment plays a key role in the safety of the system. Their positioning can be foreseen outside the hazardous area or, alternatively, in explosion-proof enclosures that can provide them with adequate protection for installation in Zone 1.
In installations with areas classified as being at risk of explosive atmospheres, the 'Ex i' is the protection mode with the most certificates active on the IECEx website. The intrinsically safe method of protection is based on the principle of eliminating the ignition by limiting the energy in the danger zone.
Cold flow in cables is the movement of the cable sheath/filler under compressive forces created by moving gaskets in the cable glands, where the compressive force applied by the gasket is greater than the resistance of the cable sheath/filler to deformation.
Combined protection methods represent a fundamental approach to guarantee the safety of electrical equipment in areas classified for the presence of potentially explosive atmospheres. Their application makes it possible to satisfy different construction and operational needs, combining the advantages of the various protection methods available.
Metallic materials are not subject to the typical problems of plastic materials such as aging and resistance to UV rays, but rather can become ignition sources themselves. This is why the legislation pays particular attention to the parts that act as housing.
The main materials of non-metallic origin in electrical equipment are plastic and elastomeric materials. Their enemies are aging, ultraviolet rays and electrostatic charges
In this article, we will delve into the connection of 'Ex db' and 'Ex eb' electric motors with 'Ex eb' junction boxes to the power line using electrical connection accessories, i.e. adapters, sealing fittings, cable glands and flexible tubes. Being able to use an Ex-eb cable gland is not at all negligible from an economic point of view. The time saving during installation compared to installing a sealing fitting or an Ex-db cable gland is considerable.
Increased safety electric motors or flameproof electric motors with increased safety connection box have been on the market for many years. Let's see the connection of Ex- db electric motors with Ex- db connection box to the power line by using some examples of system applications
In the design and use of electrical devices we must manage conductive parts with different electrical potential, with even very high voltage differences. The risk of formation of electric arcs in the air and creeping currents on the surface of the insulation material must be considered. To limit these phenomena, during the design phase we intervene on the distances between exposed conductive parts.
There are a series of physical phenomena which concern all electrical devices in general, but which assume great importance in equipment for areas classified as hazardous for potentially explosive atmospheres. One of these phenomena is called "breathing".
In a world where the installation speed, the overall site security and the installation and maintenance costs are increasingly important, the use of specific connectors as FlowEx series can find wide application.
In Europe, the process of harmonization of regulations has opened a new phase in technological development and, to all intents and purposes, can be considered a success of the process of integration of the European Union. The birth of the EEC, the establishment of the CENELEC and CEN technical committees, the first ATEX 94/9/EC regulation and then the new ATEX 2014/34/EU regulation... let's retrace together the last steps that led to the present day have a harmonized regulatory framework at Eu
Often the meaning of the supplementary letter is little known, misunderstood and misinterpreted. Not understanding the difference between component and equipment or thinking that a certificate with the final "X" is a sort of B-series certificate with strong limitations on the use of the equipment is completely anachronistic today.
In the United States, the path that led to the development of equipment suitable for use in areas at risk of explosion has followed an almost parallel path to Europe, addressing the issue first in the mining industry and then extending it to electrical devices in the NEC. The use of still current techniques demonstrates how much the more traditional methods of protection can boast a history of reliability and safety spanning more than a century.
The systems are mainly divided into systems with metal protective conduits and cable systems. The various devices require cable entries suitable for the type of protection used. The type of cable entry may appear to be a mere theoretical argument, but it has a decisive impact on the safety level of the system.
In areas at risk of explosive atmospheres, systems with electrical cable installations are nowadays a valid alternative to traditional systems with conduits systems. Their diffusion has been driven by the increasing presence of increased safety equipment such as junction boxes or 'Ex eb ' lighting fixtures, which implicitly lead to the need for sections of the system with cable installation.
In sites where there is a risk of the formation of an explosive atmosphere, we often find the electrical conduit in a metal protective tube (also called conduit conduit). Although it has recently been joined by more versatile armored and non-armored cable systems, with cable gland entry, its use is recommended in plants where production or use and maintenance activities can present dangerous situations for the integrity of the cables.
Today we define the methods of protection as techniques that are made available to us by harmonized standards, to satisfy the Essential Health and Safety Requirements. It appears clear how the first decades of the twentieth century proved to be fundamental for the development of the techniques underlying the current methods of protection.
Sealing fittings are often considered only as secondary or minor components, but the safety of an installation with metal electrical conduits and related explosion-proof enclosures depends on them. The main function of a conduit sealing fitting is to prevent the propagation of an explosion from the inside of the ‘Ex d’ flameproof enclosure to the outside.
Nowadays, the classification in an area at risk of explosion concerns many sectors of the industry and includes the use of the most diverse equipment. This great variety of devices and applications must not make us forget that the origin of explosion risk containment techniques lies down there, in those dark mines where it all began.
Explosion-proof joints are one of the basic aspects of the protection offered by an equipment or an explosion-proof enclosure. For this reason, understanding their function is a prerequisite for the correct use and the proper maintenance of all electrical devices that adopt this type of protection.
The 'Ex d' type of protection, now referred to as 'Ex db', is based on a simple theoretical concept: containment by means of a sturdy casing and flame retardancy. Its success is due to this simplicity, it is in fact one of the first methods of protection developed in the mining industry and still today it is one of the most widespread in areas classified for potentially explosive atmospheres.
A fundamental principle of the ATEX Directive 2014/34 / EU, shared with the other Union directives, is the limitation of legislative harmonization to essential health and safety requirements of public interest. Within this legislative harmonization, a role of primary importance is played by the harmonized technical legislation and the concept of the state of the art. The ATEX Directive refers to this concept as a requirement requested of manufacturers.
ATEX device's manufacturers use different types of protection to achieve a certain EPL. These methods of protection are constantly evolving both technical and regulatory. In any case, the most used are those that have established themselves historically.
Each equipment that must be installed in an ATEX classified area must have a certain level of protection, indicated in the legislation with the acronym EPL (Equipment protection Level). The level of protection is obtained by applying technical regulations that define the protection methods. There are many ways of protection, some have a historical origin, others are more recent...
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