The System Curve A fluid flow system is characterized with theSystem Curve- a graphical presentation of theEnergy Equation. The system head visualized in the System Curve above is a function of elevation - or the static head and themajor and minor lossesin the system and can be expressed as:...
System Curve and Pump Performance Curve Utilize the system curve and the pump performance curve to select the proper pump for a particular application. The System Curve A fluid flow system is characterized with the System Curve - a graphical presentation of the Energy Equation. The system head ...
Bernoulli equation defines the total head requirement and describes the pump system characteristic. Net Positive Suction Head Required is a characteristic of the pump. A pump curve indicates the pump capability to overcome the system head, which is different from the system curve which indicates the...
WATSYS 3 Point Curve A pump curve can be generated using the WATSYS 3 point method. When using the WATSYS 3 point method, a curve is created from three sets of user specified flow-head values using the equation: (8) Where: h = head q = flow rate M, L and f = coefficients Power...
Pump Curve To provide an example of a pump curve developed using the equationH=Hmax[1-(Q/Qmax)2], letQmax=1500 gpm(when head is zero) andHmax=900 ft(whenQis zero). The pump curve used in the calculation will look like: The Colebrook equation is solved for f using Newton's method ...
The energy of the pump system enclosed within the boundaries will be a combination of mechanical and thermal energy: (17.36)E=12Jω2+mu=2π2JN2+mu Hence, by differentiating E and using the conditions of equation (17.35) in equation (3.34), we may write: (17.37)4π2JNdNdt+d(mu)dt=...
and the method shall be agreed upon by the purchaser. Fan cooling for the bearing housing shall be the first choice. If fan cooling is inadequate, one of the plans in Annex B shall be selected. The cooling system shall be suitable for operationwith the coolant type, pressure and temperature...
3.3) into the resulting equation gives the temperature rise of the fluid pumped: (3.7)ΔTf=H(1−ηp)778cηp where ΔTf = temperature rise in the fluid, °F H = head developed by the pump, ft c = specific heat capacity of the fluid, BTU/lb/°F ηp = pump efficiency, –. ...
Series pumping is most effective when the system head pressure curve is steep. When head pressure is not a constraint, parallel pumping is preferred. The Eurotherm Process Automation control module for pump sequencing allows efficient management of pump load and offers a robust control combined with...
Suction-specific speed, S, an index number relating to a pump's suction performance, is calculated at BEP flowrate with the maximum diameter impeller at a given rotational speed and is defined by Equation (A.2): 吸入比转速,S,是关于泵吸入性能的指数,通过最大叶轮下最佳效率点处流量和给定转速...