Fire suppression methods systems

The objectives of fire suppression systems are to provide cooling, control the fire (i.e., prevent it from spreading) and provide extinguishment of the fire incident. A variety of fire suppression methods are available to protect a facility. Both portable and fixed systems can be used. The effectiveness of all fire extinguishing measures can be determined by the rate of flow of the extinguishing agent and the method or arrangements of delivery. 

Designing plant safety systems so that redundant safety equipment is protected by automatic fire suppression systems and separated from each other and from other plant areas by fire barriers such that a fire would not endanger other safety related equipment required for safe shutdown. Alternate or dedicated shutdown capability should be provided where the protection of safety systems required for safe shutdown is not provided by established fire suppression methods. 

For means of protection, the use of water based suppression systems may be a hazard due to the disposal of firewater water, which will freeze quite readily in exposed locations. This may also be the case with exposed hydrocarbon fluid lines that, if isolated, say for an ESD activation, may freeze up due to lack of circulation. This will hamper restart operations for the facility. Typical use in the past has been the reliance on gases fire suppression agents for enclosed area, particularly Halon. Other methods include fire water storage tanks that are kept warm, together with fire mains deeply buried and continually circulated. 

This win hamper restart operations for the facility. Typically this use of gas fire suppression systems is utilized for enclosed areas. Other methods include... 

Development of model based DBS techniques exploiting the methods of nonlinear dynamics and statistical physics was pioneered by P. A. Tass, who proposed a number of approaches. The main idea of these approaches is that suppression of the pathological rhythm should be achieved in such a way that (i) activity of individual units is not suppressed, but only their firing becomes asynchronous, and (ii) the stimulation should be minimized, e.g., it is desirable to switch it off as soon as the synchrony is suppressed (see [48, 49] and references therein). Following these ideas we suggested in our previous publications [40, 41] a delayed feedback suppression control scheme (Fig. 13.5), cf. delayed and non-delayed techniques for stabilization of lowdimensional systems [5, 22, 39] and for control of noise-induced motion [24]. In our approach it is assumed that the collective activity of many neurons is reflected in the local field potential (LFP) which can be registered by an extracellular microelectrode. Delayed and amplified LFP signal can be fed back into the systems via the second or same electrode (see [37] and references therein for a description of one electrode measurement -stimulation setup.) Numerical simulation as well as analytical analysis of the delayed feedback control demonstrate that it indeed can be exploited for suppression of the collective synchrony. 

Automatic sprinklers are particularly effective for life safety because, they warn of the existence of fire and, at the same time, apply water to the burning area (Hisley, 2003). Standard sprinklers will typically detect a fire much later than a smoke or heat detector. Therefore, a combination of a detection/alarm system and suppression system is a dependable method of protection. 

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