Breech residue

Washout. A water jet built into the chamber of a heavy gun, so that water can be squirted in to extinguish any smouldering residue from the bag charge before the breech is opened. Such residue is rarely met, but if, as is generally the case with coast and naval guns, someone is standing dose behind the breech with the next round s bag charge in his arms, it needs only one flash-back to kill everybody in the turret, and the draft... 

There is evidence to suggest that the FDR on the firer s hand is blasted on to the hand during the firing process and that residue settling from the atmosphere does not appear to contribute. Copious amounts of FDR issue from the muzzle but play a secondary role in hand deposits. The hand deposits are mainly emitted from openings around the breech and ejection port in self loading firearms and from the flash gap between the cylinder and barrel in revolvers.174 Such residues can also be deposited on to the face, head hair, and clothing of the firer. 

Finally, breech discharge residue was examined to investigate the occurrence of mercury-containing particles that would be SEM/EDX detectable (Figure 22.3) using the same pump, filter, and liquid traps as the previous experiment. Results are given in Table 22.11. 

Residue or ash removal and handling systems Waste heat recovery boiler systems Emissions control systems Breeching, stacks and dampers Controls and instrumentation... 

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