MR-HM 150.24 Hydraulic Ram – Pumping Using Water Hammer Vocational Training Equipment Hydrodynamics Experiment Apparatus Description • formation and effect of waterhammer • principle of a ram • transparent tank and visiblecheck valve for optimal observation of the function
Abruptly interrupting the water flow cancause water hammer in the pipeline. This generally undesired effect is usedspecifically in special equipment (hydraulic ram) to raise water to a higher level. Unlike conventional pumps, no additionalmechanical drive is required here. MR-HM 150.15 can be used to demonstrate the formation and effect of waterhammer and to study how a hydraulicram works. The water is fed to the ramvia a long pipe at a gradient. Above a certain water velocity the wastevalve in the ram closes automatically,due to the flow forces. This happenssuddenly, so that the kinetic energy ofthe water in the pipe is converted intopotential pressure energy. The pressureopens a check valve and the water flowsinto an air vessel. The air cushion in theair vessel dampens the water hammerand ensures a uniform lift into the elevated tank. After the water hammer hassubsided, the waste valve opens due tothe dead weight, the water in the pipestarts to flow again and the process repeats itself.
The operation of the waste valve as afunction of the weight load, the valve liftand the flow rate is studied. Furthermore, it is possible to shown how thevolume of air in the air vessel affects thelift. Valves are used to adjust the flow rate. Transparent tank, a visible check valve inthe air vessel and the visible movementof the waste valve all permit excellentobservation of the function. All components are clearly mounted on a frontplate. The water is supplied and flow ratemeasured by the base module MR-HM 150. Alternatively, the experimental unit canbe operated by the laboratory supply.
Learning objectives/experiments • demonstrate formation and effect ofwater hammer • principle of a ram • function of an air vessel • effect of air volume in the air vesseland the flow velocity on the pump behaviour • efficiency analysis
Specification [1] formation and effect of water hammer [2] pumping using water hammer [3] fixed overflow tank is used as a water source, e.g.river, pool [4] elevated tank with variable pump head [5] waste valve with adjustable lift, closes cyclically dueto flow force of the water [6] tank with check valve and air volume is used as anair vessel [7] air volume in the air vessel is varied by vent valve [8] flow rate measurement using base moduleMR-HM 150 [9] closed water supply using base module MR-HM 150 orvia lab supply
Technical data Ram • max. head 0,27m • max. flow rate: 90L/h LxWxH: 1100x640x1400mm Weight: approx. 57kg Required for operation MR-HM 150 (closed water circuit) or water connection,drain Scope of delivery 1 experimental unit 1 set of hoses 1 set of weights 1 set of instructional material