31. The 7N21 ( 9?9mm overpressure variant features an armour-piercing bullet and generates a peak pressure of. 32. However, the deflection of propellant gases rearward and the resulting overpressure may cause whiplash to the crew. 33. So it could be that this opening is specific to the fan drive segment creating the large overpressure . 34. This mine is resistant to traditional explosive mine countermeasures, which use sudden blast overpressure to detonate mines. 35. Inert gas lines are usually vented out of a gas bubbler placed in-line to prevent overpressure . 36. Metallurgic examination of the tube fragments determined that cumulative damage may have occurred from overpressures of earlier rounds. 37. Still it is possible for overpressures to occur when the washing machine or dishwasher suddenly closes a supply valve. 38. Later test explosions of nuclear weapons with houses and other test structures nearby confirmed the 5 psi overpressure threshold. 39. Similarly grassy fields and lots of foliage can help attenuate the strength of the overpressure of a sonic boom. 40. The enclosed hull reduced situational awareness but allowed for the installation of central heating and an NBC overpressure system.
