Material for Hazardous Area Classifications (Chapter 2)

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About Course

In a modern industrial setting, hazardous conditions may result from a wide range of products and processes. Since working in or near hazardous conditions is necessary, it is crucial to know what makes a location hazardous and what methods of protection are available. It is also important to gain an appreciation for the industrial safety standards and practices related to hazardous locations.

This chapter provides a working definition of hazardous location and provides some basic information about explosive atmospheres, the conditions required for ignition and the conditions required for a hazardous location to be explosive. The chapter also includes a description of protection methods used for the design and installation of apparatus used in hazardous locations.

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What Will You Learn?

  • GENERAL PRINCIPALS
  • 2.1 What is a Hazardous Location?
  • 2.2 What Causes an Explosion?
  • 2.3 Fire Triangle
  • 2.4 Ignition source must be present
  • 2.5 Anatomy of an Explosion
  • 2.6 Terminology of Hazardous Locations
  • 2.7 Temperatures
  • 2.8 Minimum Ignition Values
  • 2.9 Explosive Limits
  • 2.10 Explosion Pressures
  • 2.11 Working in Hazardous Locations
  • 2.12 General Design Concepts
  • 2.13 Protecting Systems

Course Content

Hazardous Area Classifications (chapter 1)
Explosions can happen almost anywhere. Any spark or heated surface that comes in contact with a hazardous atmosphere can result in an explosion. Hazardous locations are environments that are extraordinarily susceptible to explosions. Finding ways to operate in hazardous locations is not a new problem. Many of the basic processes and systems used today were actually developed in the early 1900sFor example, one of the first documented uses of intrinsically safe products occurred in coal mines in England in 1912 after a communication system fault contributed to disastrous explosions. Following World War I as the demand for petrochemical products and the use of electrical control systems increased, the concept of containing components in explosion-proof enclosures was introduced and widely used. Today, changes in technology require new methods of protection. In addition, worldwide economic changes have prompted a harmonization of the standards for classification of hazardous locations, certification of products, and codes governing installations. This chapter introduces the concepts and classifications of hazard locations. It begins with a brief history and overview of working in hazardous locations. The chapter includes summary information on certifications, standards, and codes.

  • Material for Hazardous Area Classification (Chapter 2)
  • Quiz

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