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الرجاء المساعدة السريعة

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  1. [1]
    الصورة الرمزية المهندسة الكيماوية
    المهندسة الكيماوية
    المهندسة الكيماوية غير متواجد حالياً

    جديد

    تاريخ التسجيل: May 2008
    المشاركات: 6
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    الرجاء المساعدة السريعة

    انا بحاجة الى مساعدة سريعة
    احتاج الى معلومات عن explosion proof equipment
    لاننا نقوم بدراسة عن هذا الموضوع
    وتسليم المشروع يوم الاحد 23/8
    لذلك احتاج المعلومات بسرعة لو سمحتوا
    ولكم جزيل الشكر

    من مواضيع المهندسة الكيماوية :


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  2. [2]
    المهندسة الكيماوية
    المهندسة الكيماوية غير متواجد حالياً
    جديد
    الصورة الرمزية المهندسة الكيماوية


    تاريخ التسجيل: May 2008
    المشاركات: 6
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    تعديل

    عفوا تسليم المشروع 23/11 يوم الاحد

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  3. [3]
    عثمان الراوي
    عثمان الراوي غير متواجد حالياً
    عضو فعال جداً
    الصورة الرمزية عثمان الراوي


    تاريخ التسجيل: Sep 2008
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    Practical Electrical Equipment and Installations in Hazardous Areas
    by Geoffrey Bottrill, Derek Cheyne, G Vijayaraghavan



    Book Description:
    This book provides the reader with an understanding of the hazards involved in using electrical equipment in Potentially Explosive Atmospheres. It is based on the newly adopted international IEC79 Series of Standards that are now harmonizing and replacing older national Standards. Explosion-proof installations can be expensive to design, install and operate. The strategies and techniques described in this book can significantly reduce costs whilst maintaining plant safety. The book explains the associated terminology and its correct use - from Area Classification through to the selection of explosion-protected electrical apparatus, describing how protection is achieved and maintained in line with these international requirements. The IEC standards require that engineering staff and their management are trained effectively and safely in Hazardous Areas, and this book is designed to help fulfill that need. A basic understanding of instrumentation and electrical theory would be of benefit to the reader, but no previous knowledge of hazardous area installation is required.

    An engineer's guide to the hazards and best practice for using electrical [COLOR=orange! important][COLOR=orange! important]equip[/COLOR][/COLOR]

    in Potentially Explosive Atmospheres.
    Fully in line with the newly adopted international standards, the IEC79 series
    * Clear explanations of terminology and background information make this the most accessible book on this subject

    http://mihd.net/84bito/e0750663987.pdf


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  4. [4]
    mnci
    mnci غير متواجد حالياً
    تم إيقافه لمخالفة القوانين
    الصورة الرمزية mnci


    تاريخ التسجيل: Jul 2006
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  5. [5]
    محسن النقيب
    محسن النقيب غير متواجد حالياً
    عضو فعال
    الصورة الرمزية محسن النقيب


    تاريخ التسجيل: Oct 2007
    المشاركات: 149
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    السلام عليكم

    مرحبا .......................... هذه ممكن تفيدكم

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    الملفات المرفقة

  6. [6]
    المهندسة الكيماوية
    المهندسة الكيماوية غير متواجد حالياً
    جديد
    الصورة الرمزية المهندسة الكيماوية


    تاريخ التسجيل: May 2008
    المشاركات: 6
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    مشكورين على المساعدة
    المعلومات كتير فادتنا
    ادعولنا يكون مشروعنا امنيح وتكون علامتنا امنيحة
    مشكورين كمان مرة

    0 Not allowed!



  7. [7]
    المهندسة الكيماوية
    المهندسة الكيماوية غير متواجد حالياً
    جديد
    الصورة الرمزية المهندسة الكيماوية


    تاريخ التسجيل: May 2008
    المشاركات: 6
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    الاخ محسن النقيب اذا سمحت بدي عناوين الانترنت اللي اخذت منهم الملفات
    لانو مطلوب منا نحط refrances في اخر المشروع
    وشكرا

    0 Not allowed!


    لا تجعل نفسك ارضا يداس عليها بل اجعلها سماء يتمنى الناس الوصول اليها

  8. [8]
    ibrahim Abass
    ibrahim Abass غير متواجد حالياً
    عضو فعال


    تاريخ التسجيل: Aug 2006
    المشاركات: 63
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    It is very important to read about ATEX for selection of equipments in hazard area. For dust zone 20,21 and 22
    For vapour and explosive gas zone 0,1 and 2

    Explosion proof equipment in hazardous areas
    A Guide to the Selection of Electrical Equipment for Installation in Hazardous Areas

    The information below is given as a guide to enable the users of this catalogue to select the correct hazardous area equipment for their application. It should not be used to define the nature of hazardous areas, this is a task for experienced professionals in the field of hazardous area definition. Nor should it be used as replacement for the very detailed standards which cover the installation of electrical equipment in hazardous areas.
    Hazardous Atmospheres
    What conditions are required for an explosion?
    There are three elements required in order to create a hazardous area.
    1. Air.
    2. A flammable medium for example gases, vapours, mists and dusts.
    3. A source of ignition of sufficient energy and /or a rise in temperature.

    What is an explosive atmosphere?
    The classification of hazardous areas
    Gases, Vapours, Mists and Dusts.
    Explosive atmospheres are caused by a mixture of gases, vapours, mists dusts and air. If the explosive atmosphere is caused by gases, vapours and mists the hazardous area is coded G. If the explosive atmosphere is caused by dusts the hazardous area is coded D.
    Explosion Groups
    Explosion protected electrical equipment is classified in terms of the ignition temperature, the ignition capability and flame transmission capacity of the explosive atmosphere in which it is designed to operate.

    In the first instance equipment is divided into two groups dependingon its location above or below ground.

    Group I Electrical equipment for use below ground in areas susceptible to firedamp.

    Group II Electrical equipment for all other areas.

    Group II equipment is further divided into three sub groups depending on the ignition and flame transmission characteristics of the explosive hazard.

    These sub-groups are designated IIA, IIB and IIC.Zones


    An explosive atmosphere is created when air and an flammable medium mix such that a rise in temperature or an electrical spark produces an explosion.
    The probability of an explosive atmosphere occurring.
    Zone 0 defines an area in which an explosive atmosphere caused by a mixture of air and gases, vapours and mists is present continuously for long periods or very frequently.

    Zone 1 defines areas in which an explosive atmosphere caused by a mixture air and gases, vapours and mists is expected to occur occasionally.

    Zone 2 defines areas in which an explosive atmosphere caused by a mixture of air and gases, vapours and mists is unlikely and if it should occur it will be for a short time and then only rarely.

    Zone 20 defines an area in which an explosive atmosphere caused by a cloud of combustible dust and air is present continuously for long periods or very frequently.

    Zone 21 defines areas in which an explosive atmosphere caused by a cloud of combustible dust and air is expected to occur occasionally.

    Zone 22 defines areas in which an explosive atmosphere caused by a cloud of combustible dust and air is unlikely and if it should occur it will be for a short time and then only rarely.



    What is a potentially explosive atmosphere?
    An atmosphere is defined as potentially explosive when in its normal state it is not explosive but there exists the possibility that in abnormal circumstances it will become explosive. For example in the case of a gas leak or the vapourisation of a fluid leak.

    Ignition Energy
    An explosive atmosphere needs a minimum energy for ignition. The energy produced by arcs and sparks are many times greater than this minimum.

    Self Ignition Temperature
    An explosive atmosphere can self ignite if the local temperature rises above the so-called self ignition temperature. This temperature is different for different flammable mediums. Self ignition temperatures for a range of commonly found flammable gasses and dust


    Ex II 2 G/D EEx p IIB T4

    Label above electrical equipments whish use in explosion zone

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  9. [9]
    المهندسة الكيماوية
    المهندسة الكيماوية غير متواجد حالياً
    جديد
    الصورة الرمزية المهندسة الكيماوية


    تاريخ التسجيل: May 2008
    المشاركات: 6
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    شكرا كتير للاخ ابراهيم عباس
    بس احنا مشروعنا بتركز اكتر على ال equipment
    مشكور

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    لا تجعل نفسك ارضا يداس عليها بل اجعلها سماء يتمنى الناس الوصول اليها

  
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