What are characteristics curves?

What are characteristics curves?

A characteristic curve is a graph of the relationship between the amount of exposure given a film and it’s corresponding density after processing. 1. A typical film characteristic curve is made by plotting density produced, against the log of exposure given (Log E).

What are the characteristics of pumps?

Pump characteristics—such as flow, pressure, efficiency and brake horsepower—are shown graphically on a pump curve.

How pump characteristics curve is important for selection of any suitable pump?

It is also important to check that the flow rate and head of the pump are within the required specifications, which are normally presented as the Pump Characteristic curves. These plots play an important role in understanding the region in which the pump needs to be operated thus ensuring the life of the pump.

What is the importance of characteristic curve?

I-V characteristic curves are generally used as a tool to determine and understand the basic parameters of a component or device and which can also be used to mathematically model its behaviour within an electronic circuit.

How do you find the characteristic curve?

For a PDE a(x,y,z)zx+b(x,y,z)zy=c(x,y,z), you can obtain the characteristic by solving the ODE’s dxds=a(x,y,z), dyds=b(x,y,z) dzds=c(x,y,z).

What is performance curves for pumps?

A pump performance curve indicates how a pump will perform in regards to pressure head and flow. A curve is defined for a specific operating speed (rpm) and a specific inlet/outlet diameter.

Why are pump curves important?

Pump curves are not only used to pick the correct pump for an application but can also be used to estimate flow rates for an already installed system. By knowing the model, discharge pressure, suction pressure, and impeller size, the flow rate can easily be determined from the curve.

What do you understand by the characteristic curves of a centrifugal pump explain various important types of characteristic curves?

The characteristic curves of centrifugal pumps plot the course of the following parameters against flow rate (Q): head (H) (see H/Q curve), power input (P), pump efficiency (η) and NPSHr, i.e. the NPSH required by the pump.

What does characteristic shape mean?

n. 1 a distinguishing quality, attribute, or trait. 2 (Maths)

What is a characteristic curve PDE?

Characteristics of first-order partial differential equation For a first-order PDE (partial differential equation), the method of characteristics discovers curves (called characteristic curves or just characteristics) along which the PDE becomes an ordinary differential equation (ODE).

How do you find the characteristic curves PDE?

For a PDE of the form (2.1), we look for integral curves for the vector field V = (a(x, y),b(x, y),c(x, y)) associated with the PDE. These integral curves are known as the characteristic curves for (2.1). These characteristic curves are found by solving the system of ODEs (2.2).

What’s the significance of pump characteristic curves?

The pump characteristic curve can be used effectively to select a suitable pump for the duty that is required and it can also be used to establish the capacity of a pipeline system as a function of the speed of a pump that already exists in the pipeline.

What do you understand by characteristics curves of a pump?

A pump curve is a graphical representation of the performance characteristics of a pump. A pump curve provides a wealth of information regarding the performance capabilities of a pump. Information is plotted on an x-y graph where the x-axis is measured in units of flow and the y-axis is measured in units of head, power, and NPSHr.

How to read a pump curve?

Head & Flow. The first piece of information provided by a pump curve is the flow that the pump will develop at any given…

Efficiency. In addition to head and flow, most pump performance curves will also provide efficiency information.

Net Positive Suction Head Required (NPSHr). The next part of the pump curve is the Net Positive Suction Head…

What are the characteristics of centrifugal pump?

Pump Terms. Suction lift exists when the source of supply is below the centerline of the pump.

Power. The work performed by a centrifugal pump is a function of the total head and the weight of the liquid pumped in a given time period.

Reading a Pump Performance Curve.

Affinity Laws Applied to Centrifugal Pump Applications.