Manometric pressure bomb

If experimental test results (manometric pressure bomb) for the maximum pressure using different loading densities are available, the force fE and the covolumes bE can be calculated as follows ... 

The ballistic bomb (pressure bomb, manometric bomb) is used to study the burn-up properties of a -> Gunpowder or -> Propellant charge powder. It consists of a pressure-resistant (dynamic loading up to about 1000 MPa (10000 bar) hollow steel body that can be bolted... 

Its rate of detonation, as detd by the Dautriche method, was about the same as that of TNT (6880m/sec). Its sensitivity to impact, as detd in Fr, was considerably lower than for PA, but according to tests conducted in Engl, TNPht was more sensitive than PA (Ref 8). When pellets of TNPht (d 0.25g/cc) were fired in a manometric bomb, the pressure developed was 2490kg/sq cm, as against 3230 for PA... 

Determination of Detonation Velocity (71-4) Sensitivity to Impact (Sensibilite/ au choc) (74-5) Sensitivity to Friction (75-6) Sensitivity to Initiation (Sensibilite a 1 amorce) (76) Pressure Measurements by Manometric Bomb, by Crusher Test and by Piezoelectric Manometer (79 97) Density Determination (99-100) Chronographs of Schulze and of Le Boulange (101) Tests for Stability by Methods of Abel, Spica, Vieille at 110°C, German at 135° Bergmann-Junk, Su, Hansen-Grotannelli, Silvered Vessel and Taliani (107-09) Explosion Test (109-10)... 

The explosive power of tetryl at a loading density of 0.3, was compared with that of other explosives in a manometric bomb by Koehler [51] who determined the following pressure values from which the temperatures of explosion have been computed ... 

Bomb Manometric. A manometric bomb is a device for measuring the pressure developed on expln and of some other props of expls and proplnts. One of the best known devices is the Bichel Bomb, briefly described in Vol l,p VIII... 

None of the nitrated naphthalenes is very sensitive to shock. a-Nitronaphthalene is not an explosive at all and cannot be detonated. Dinitronaphthalene begins to show a feeble capacity for explosion, and trinitronaphthalene stands between dinitrobenzene and dinitrotoluene in its explosive power. Tetranitro-naphthalene is about as powerful as TNT, and distinctly less sensitive to impact than that explosive. Vennin and Chesneau report that the nitrated naphthalenes, charged in a manometric bomb at a density of loading of 0.3, gave on firing the pressures indicated below.46... 

Resorcinol nitrates readily to the trinitro compound, yellow prisms from water or alcohol, m.p. 175.5°. Styphnic acid is more expensive and less powerful than picric acid. Liouville67 found that styphnic acid exploded in a manometric bomb, at a density of loading of 0.2, gave a pressure of 2260 kilos per sq. cm., whereas picric acid under the same conditions gave a pressure of 2350 kilos per sq. cm. It did not agglomerate to satisfactory pellets under a pressure of 3600 kilos per sq. cm. It is a fairly strong dibasic acid, and its salts are notably more violent explosives than the picrates. Lead styphnate has been used to facilitate the ignition of lead azide in detonators. 

The conditions under which mono-, di-, tri- and tetra-nitronaphthalenes Me formed were investigated in detail by Patart [19] in extensive experimental work. By applying similar conditions (temperature and time) for the nitration of naphthalene with various nitrating mixtures, Patart determined the compositions of the products (the number of nitro groups) from the pressures they produced in a manometric bomb. The pressures, produced by pure substMices were known, viz. ... 

Desvergnes has tested the explosive properties of l-chloro-2,4-dinitrobenzene in a manometric bomb. At a density of 0.25, on comparison with other dinitro compounds, he obtained pressures ... 

Figure 3 shows the time profile of the pressure in the manometric bomb for a typical 7-hole powder. Initially the pressure is increasingly steep, since burn-up takes place more quickly the higher the pressure... 

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