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# 50911 Hydraulics code 0913

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# Description

Task 1

The U-shaped container are poured water and mercury. The line between fluids located below the free surface of the mercury in the hrt = 7 cm. Determine the level difference h in both parts of the vessel.

Task 2

Determine the effect of hydrostatic pressure of water on a square board with a side of d, closing the hole in the wall of an inclined plane, as well as the depth of immersion of pressure center hc.

The proportion of water γ = 1000 kg / m3; α = 450; d = 0,3 m; a = 0.5 m.

Activity 3

Determine the height of the Z-axis centrifugal pump above the water level in the water sources, if the pump flow Q, suction pipe diameter d, the pressure loss in the suction pipe is 1.45 m.vod.st., the vacuum created by the pump Pm.

Q = 20 l / s; d = 100 mm; Rvak = 6 x 104 Pa.

Task 4

Water in an amount Qp supplied by the centrifugal pump to the ejector, creating pressure upstream of the nozzle Px. Dimensions ejector following: inlet pipe diameter d1 = 70 mm, nozzle diameter d2 = 20 mm.

The water from the flow line installation pours into the atmosphere. Is it possible to raise the ejector according to the water tank, which is located at a height of H = 4,5 m below the axis of the ejector? Water density = 103 kg / m3, the atmospheric pressure Rath = 9.81 x 104 Pa.

P1 = 35 x 104 Pa; Q = 5,6 l / s

Task 5

Determine the pressure p1 in a horizontal section 1-1 of the jetting nozzle, the speed required to impart water outlet section 2-2, V2, if the water velocity at the section 1-1 V1.

V1 = 3 m / s; V2 = 38 m / s

Task 6

To determine the diameter d of the narrowed portion of the horizontal pipe, at which the water will rise to a height h = 3,5 m at a flow rate Q, the expanded diameter part D.

Q = 6 l / s; D = 90 mm.

Task 7

To determine the pressure increase? P in the steel pipe of length L, diameter d and wall thickness δ in the hydraulic shock if the water flow rate Q, the moduli of elasticity of the material of the pipe wall E = 2 x 1011 Pa and water E0 = 2 x 109 Pa. The closing time of the valve in the pipeline τ.

L = 500 m; d = 0,2 m; δ = 5 mm; Q = 25 l / s; τ = 4.

Task 8

Water is supplied to the fire AN-40 (130) 64 by the tubular system consisting of a backbone length LM diameter dm and three working lines length lp diameter dp through trunks with DH = 13 mm. Rubber hoses, guns raised to the level of the second floor. Assessing whether the work of the Academy of Sciences of the pump-hose system, if you want to get the length of a compact jet of the jet at least 17 m.

LM = 60 m; lp = 40 m; dm = 66 mm.

Task 9

Required to implement pumping water at a flow rate Q a distance L through 40-APR-pump on two lines with a bag neprorezinennym diameter 77 mm. Excess head-pump over the water source z. Determine the number of pumps and pumping distance between them. What can be done to reduce the number of pumps involved in pumping and thereby increase the distance between them?

Q = 15 l / s; L = 2000 m; z = 12 m.

Activity 12

Determine the height of the water tower, if the pressure loss on the network with the drinking water supply hc, when the water supply during a fire hsl. Height difference dictating the points and the installation of the tower Zd.t - Zv.b. Should we turn off during a fire a water tower when a low-pressure water:

hc = 45 m; hsl = 50 m; Zd.t - Zv.b = -16; Number of Floors = 5

Activity 13

To determine the amount of emergency reserve water tank water tower, the total for the settlement enterprise and if the area of \u200b\u200bthe enterprise more than 150 hectares, and the two main workshops are located in buildings with lanterns II degree of fire resistance category B, the volume V1 and V2. The number of inhabitants in the village N, five-storey building construction. The maximum water flow for drinking and sanitary needs Qpot.

V1 = 30 m3; V2 = 70 m3; N = 27 thousand .; Qpot = 95 l / s.

# Additional information

Activity 14

Identify the emergency supply of water in reservoirs of clean water (PWR) for the combined water supply system of the village with a population of N persons, five-story buildings and businesses located outside of the village in a building of II degree of fire resistance category B, the volume V, width of less than 60 m. Area businesses S. maximum economic-drinking, industrial water consumption in the water Qhoz.

N = 15 thousand .; V = 30 m3; S = 110 ha; Qhoz = 120 l / s.

Task 15

Identify the emergency supply of water in the CWR for combined water supply system, if the village is home to N people, four-story building, and the company occupies an area of \u200b\u200bless than 150 hectares, has a plant capacity of V, width 60 m, building II degree of fire resistance, the production of category B. The company is located within the village. Maximum economic-drinking, industrial water consumption in the water Qhoz.

N = 17 thousand .; V = 25 m3; Qhoz = 120 l / s.

Task 16

Identify the emergency supply of water in the CWR for combined water supply system, if the village is home to N people, five-story building, and the company covers an area of \u200b\u200b150 hectares, has a housing volumes V1 and V2, II degree of fire resistance of the building, production Category A. The company is located outside of the village . Maximum economic-drinking, industrial water consumption in the water Qhoz.

V1 = 15 m3; V2 = 22 m3; N = 22 thousand .; Qpot = 130 l / sec