Hydraulics 318 option 6

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Uploaded: 22.02.2013
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Problem number 4
To fill the pipeline fire reservoir used length L = 300 m. Determine the required pump head when the reservoir elevation above the source Z = 18 m hydraulic gradient i = 0,01, free head at the end of the line NSV = 9.
Problem number 5
To determine the maximum height of the axis of the centrifugal pump above the source water h, if the flow of water from pump Q = 45 l / s, the diameter of the suction pipe d = 200 mm. Vacuum pressure generated in the intake pipe PB = 5 x 104 Pa pressure loss in the suction line of 1 m.
Problem number 6
To preserve the integrity of fire water storage tank in the suction line is equipped with an air tube, the upper section is located at the level of the stock in the tank fire. It is assumed that when the level of water to the fire the stock due to the air-vozniknove of vacuum in the section, which are welded to the tube penetrates into the suction side of the pump, there will be failure of the pump and the water intake end.
Determine whether to save the emergency supply of water if the uro-Wen water is at a height h = 3 m above the axis of the suction pipe. Pipe Diameter D = 125 mm, flow rate Q = 50 l / s. The tube is equipped with a suction valve grid (ξ1 = 6) and has a foot (ξ1 = 0,5).
Objective number 7
Determine an increase in pressure in the pipe length L = 600 m dia-meter d = 0,3 m and a wall thickness δ = 3,3 mm when the hydraulic shock if Q = water flow rate of 20 l / s, the moduli of elasticity of the pipe walls Em = 2 x 1011 Pa and water hedgehog = 2 x 109 Pa. The closing time of the valve in the pipeline with t3 = 2,4.
Task number 8
Determine the maximum possible length of the main line LM, if the second barrel (dN2 = 19 mm) is necessary to obtain a stream of performance g2 = 4,8 l / s.
Sleeve system consists of a main line diameter dM = 77 mm, and three business lines lengths l1 = 60 m, l2 = 40 m, l3 = 60 m; diameter d1 = 51 mm, d2 = 66 mm, d3 = 51 mm and stems with diameters of nozzles dN1 = 13 mm dN2 = 19 mm, = 16 mm dN3. Stems are raised relative to the height of the branching Z1 = 4 m, Z2 = 4 m, Z3 = 2 m, and is installed relative to the axis of branching fire engine pump PDA-40 (130) at a height of 4 m = Zrazv.
Objective number 9
Determine the number AHP-pump - 40 (130) needed for water supply to the pumping, if the difference in elevation between the head-pump and water source Z = 12 m. Pumping is done at a distance L = 1800 m on two lines with a bag rubberized d1 = 77 mm and d2 = 66 mm. The head-pump, located at the site of the fire, provides the two trunks with diameters of nozzles dN1 = 19 mm and 16 mm = dN2. The pump operates in α = 0,75. Sleeves of rubber.
Problem number 10
To fire monitors from the nozzle dN1 = 32 mm water supply from two fire trucks APR-40 (130) and AA-40 (131). From car PDA-40 (130) is extended hose line diameter d1 = 77 mm rubberized sleeves length L1 = 100 mm, and from the vehicle AA-40 (131) - from rubberized sleeves diameter d2 = 77 mm and a length L2 = 155 mm . The trunk is raised to a height of Z = 1 m. Determine the pitch of each of the fire pumps.


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