In this article, the stability of pipes during gas passage, gas passage through the nozzle grid at different pressures is investigated. The experiments conducted to study the characteristic allow us to analyze the influence of the static pressure distribution along the perimeter of the pipe and the nozzle grid, which depends on the height of the pipe rise, air flow, live cross-section and diameter of the nozzle grid itself. The experiments showed that an area of excess pressure is formed on the lower half of the pipe. At , excess pressure is abruptly replaced by a rarefaction area. The magnitude of the rarefaction depends on the air outlet speed between the pipe under study and the edge of the nozzle grid, as well as the height of the pipe rise. Depending on the height of the pipe lift h and the gap between the pipe under study and the edge of the nozzle grid δ, different channel configurations are observed. With a further increase in the angle, the static pressure on the pipe surface decreases sharply and at it passes from excess to vacuum. At the height of the pipe lift mm, the channel has the shape of a confuser, in this case the pressure on the pipe surface decreases smoothly when the angle changes within the range of . With a further increase in the angle, the static pressure decreases sharply, and at it passes to vacuum. The value of the vacuum increases with increasing height of the pipe lift, when . The nature of the static pressure distribution along the perimeter of the nozzle grid within the angle approaches the pressure on the surface of the pipe under study. the static pressure values around the nozzle grid perimeter for both diffuser and confuser channel shapes are very close to the values on the pipe surface.