Delayed ignition

To make these polymers have the desired properties, certain additives (chemicals), as noted below, are added to the sheathing compound in specific ratios. The additives act like Hame retardants and diminish the igniiability of the insulation by lowering the temperature of the cable, delaying ignition and resisting the spread of fire in the insulation and ihe polymeric compounds... 

The time delay decreases as the ignition temperature increases. Tliis means that when a flammable fluid in a flow system comes in contact with a hot surface for a time (shorter than tlie time delay), ignition mtiy not occur. 

Zeit-wort, n. verb. -2Under, m. time fuse delay-action cap, delay igniter. -2iindung, /. delayed ignition. -2wischenrauni, m. time interval. 

With a very small amount of concentrated sodium hydroxide solution mixed with zinc, the temperature rise is such that water vapourises rapidly and the remaining zinc can detonate spontaneously. Attempts to obtain delayed ignitions of the mixture with this reaction have failed. 

Class 1B flammable liquid, if released at atmospheric pressure and ambient temperatures, forms a pool of flammable liquid that, if ignited, develops into a pool fire. If delayed ignition occurs, experience has shown a flash fire may result. For the example under consideration, explosions are extremely unlikely because ... 

Liquid evaporation rate] x [time for cloud to achieve delayed ignition]... 

The release of pressurized material from a compressor or its associated piping may be subject to delayed ignition, resulting in an explosion (if located in a building) or a flash fire (if located outdoors). 

The release of a flammable gas or the vaporization of a liquefied flammable gas can lead to different types of fire scenarios dependent on the release mechanism and the point of ignition. Figure 5-2 on page 53 illustrates the different outcomes expected from a gas release. If ignition of a gas release does not occur immediately at the origin of the release, then a gas cloud can develop (the same situation can also occur above flammable liquid spills). A delayed ignition of the gas cloud can result in a flash fire in which the premixed (fuel and air) gas cloud burns rapidly, typically in a matter of seconds. 

Fig l-20d ILLUMINATING HAND GRENADE Mkl W/DELAY IGNITION FUZE... 

Italian Igniters, pp 173-76 Chemical Delay Igniter (for demolition charges), Time Delay (Lead shear wire), Friction Delay (Micca Da 40 60) 50-Day Clock French Bomb Fuzes, Mechanical Impact Nose, pp 189-200 Type A, Type H, Type RSA Models 1925, 1928, 1929 1930, Type MBis, Nos 9, 10 11 Ditto, Tail Fuzes, pp 201-03 No 3 Bis,... 

Rocket bomb fuze assembly) Ger 166 (Rocket propellent igniter) Ger 174-175 (Self-destroying fuze) Ger 199-202 (Igniters for tracers described under Tracer Compositions) Ger 215 (V-22 Delay-igniter unit)... 

Heiskell claims a tracer unit for a projectile, suitable for improving daylight visibility having a non-flash slow-burning compn which delays ignition of the tracer compn for a predetermined time (Ref 5)... 

A. Stettbacher, 30, 2387 (1936) and Nitrocellulose, 6, 202 (1935) Chemical and mechanical delay igniters. A review, mainly of chemical delay incendiary bombs... 

The inner part of typical fuze consisted of two sections, as shown in Fig E7 a) The upper section, called the switch block, was molded polystyrene which has been machined to take various plunger contacts, the trembler switches, and in some cases long delay igniter bridge... 

Fig 18 Experimental Setup in a Vacuum System for Testing the Delayed Ignition of Spontaneously Ignitable gases (from Ref 7)... 

Delay Igniters (Zeitziinder, in Ger). Various chemical and mechanical delay igniters are described by A.Stettbacher in Nitrocellulose 6, 202-04 220-25 (1935) and 9, 75 7, 100-01 ... 

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