Booster critical pressure

HMTeA, AN/TNT AN/Comp B) show that chge density, per se, has the strongest influence on critical pressure. Another important factor is reaction zone length. Chem differences betwn expls have a minor effect dynamites contg NG are a notable exception The problem of sensitivity testing is also examined because deton limit data show that the critical shock pressure decreases with increasing particle size. This seems to run counter to the results of minimum booster-type sensitivity tests. The discrepancy is resolved when shock wave initiation is viewed as a combination effect of both pressure duration... 

Cook states that MB varies approximately as the inverse of the booster detonation pressure, ie, the higher the detonation pressure of the booster the smaller the size of the booster required to detonate Slurries. A variety of Slurry boosters are now being sold. Most expl manufs make specific recoimnendations as to the type of boosters to be used with their Slurries The critical diams of SE and SBA are influenced differently by Slurry d. This is shown in Fig 6 taken from Ref 9. For SBA or even SE that contain no self-expl ingredients, sensitivity (ie, inverse d. ) decreases as Slurry d is increased. Just the opposite effect is observed with SE ccHitaining TNT and presumably other self-expl materials. Incidentally, Cook claims that coarse TNT is almost as good a sensitizer as more powerful expls such as Comp B or even RDX... 

Steam jet thermocompressors or steam boosters are used to boost or raise the pressure of low pressure steam to a pressure intermediate bettveen this and the pressure of the motive high pressure steam. These are useful and economical when the steam balance allows the use of the necessary pressure levels. The reuse of exhaust steam from turbines is frequently encountered. The principle of operation is the same as for other ejectors. The position of the nozzle with respect to the diffuser is critical, and care must be used to properly posidon all gaskets, etc. The thermal efficiency is high as the only heat loss is due to radiation [5]. 

A booster pump is required, for it is quite important to keep the pressure above the minimum value of about 3500 lb. The temperature of the reduction is above the critical temperature of ammonia, and the pressure will not fall much below 3500... 

In examining the process of initiation of expls, ic is of importance to determine not only the critical density, p, and critical diameter, dc, of a detonator (or booster), but also its critical length, lc, which is the shortest length required for steady state detonation. It is known that if the initial velocity of shock wave of an initiator is equal to or lower than the velocity of sound, C0, in the charge to be initiated, no detonation can take place even with a large initiator. This means that the critical detonation velocity of an initiator, Dc, must be higher than a certain value which is different for each explosive to be initiated. Another requirement for successful detonation is that pressure at the front of a detonation wave produced by initiator at the expense of chemical energy, must be maintained at a certain minimum level... 

Of potential practical importance is the observation that reduction of drop size produces enhanced foam stability with these systems. In part, this derives from the relative dimensions of the Plateau borders and the PDMS drops as revealed by consideration of Equations 4.40 and 4.41. If the drop size is too small, it will simply pass through the Plateau borders without being subject to the applied capillary pressure required to rupture the relevant pseudoemulsion films. However, in the case of 0.1 M solutions of sodium dodecyl polyoxyethylene sulfate, the critical capillary pressure for rupture of the pseudoemulsion film also actually increases with decreasing drop size as shown in Figure 3.7. Enhanced stability of the foam of this solution could also be achieved by addition of a betaine foam booster as shown in Table 4.4. The principle effect of the betaine in this context would appear to be an increase in p. ... 

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