Why Was This Book Written

There is a need in many chemical processes for protection against propagation of nnwanted combnstion phenomena snch as deflagrations and detonations (inclnding decomposition flames) in process eqnipment, piping, and especially vent manifold systems (vapor collection systems). 

There are different ways, both passive and active, to provide this desired protection against deflagrations and detonations. Methods inclnde DBAs, venting, pressnre containment, oxidant concentration rednction (inerting and fnel enrichment), combnstibles concentration rednction (ventilation or air dilntion), deflagration snppression, and eqnipment and piping isolation. These are discnssed in more detail in Chapter 3. 

This book makes reference to flame arresters, deflagration flame arresters, and detonation flame arresters. Flame arresters is the generic term for both deflagration and detonation flame arresters. Deflagration flame arresters are nsed when a flame only propagates at snbsonic velocity, whereas detonation arresters are nsed when a flame can propagate at all velocities inclnding snpersonic velocities. 

One of the major reasons that this book was written is that nonspecialist chemical engineers know little abont DBAs. Althongh DBAs have been specified and installed for many years, qnite often they have failed becanse the wrong type of flame arrester was specified, or it was improperly installed, or inadeqnate inspection and maintenance were provided. 

It is intended that this book will foster effective nnderstanding, application and operation of DBAs by providing cnrrent knowledge on their principles of operation, selection, installation, and maintenance methods. 

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