Classifying Explosion Prone Areas for the Petroleum, Chemical and Related Industries

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Overview

The degree of danger in the atmosphere of a hazardous location needs to be determined prior to selecting an acceptable electrical equipment installation. If maximum safety is the predominant factor in determining the type of electrical installations, the cost of electrical equipment will be extremely high. If low cost of electrical installation is the predominant factor, safety to personnel and equipment may be unacceptably low. It is, therefore, necessary to find a point of balance at which the cost and safety requirements are both satisfied and acceptable.

In nine out of ten cases, a hazardous location is classified much too conservatively. The reason for this conservative approach is a lack of knowledge and a misunderstanding of the actual concept of safety and danger. This book provides an in-depth understanding of the factors that influence the classification of a hazardous location. One factor, in combination with one or more other factors, will have an impact on the level of danger and its hazardous boundaries. These factors and their influences are explained in detail, and once their impact is understood, the classification of a hazardous location becomes a straightforward procedure.

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Product Details

  • ISBN-13: 9780815513667
  • Publisher: Elsevier Science
  • Publication date: 4/1/1995
  • Pages: 442
  • Product dimensions: 1.00 (w) x 7.00 (h) x 10.00 (d)

Table of Contents

Introduction
Section 1. Fundamentals
Flammable and Combustible Principles of Hazardous Products
Classifying Sources of Hazard
The Extent of Explosion Danger for NEC Class I Locations
Spatial Considerations
The Degree of Explosion Danger for NEC Class H Locations
Ventilation Requirements
Electrical Equipment for NEC Class I Locations
Electrical Equipment for NEC Class II, Group F Locations
Intrinsically Safe Equipment and Wiring
Installation of Electrical Instruments in Hazardous Locations
Hydrogen Gas
Cathodic Protection
Static Electricity
Grounding of Tanks, Pipelines, and Tank Cars
Grounding Requirements for Electrical Equipment
Application of Seals in NEC Class I Locations
Application of Seals in NEC Class II Locations
Section 2. Application of Fundamentals
Appendix: Properties of Flammable Liquids, Gases and Solids
Definitions
Bibliography
Index
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