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The velocity is constant in a steady flow pipe while in the unsteady flow the velocity is not constant.
the flow of liquid throw a pipe line is said to be stream line if at any given point , the velocity of the particles is constant.
Is the measured process media a liquid or a gas? Is the flow measurement occurring in a pipe or in an open channel? What is the the flow rate? How much does the flow vary? If liquid, is it clean or does it contain suspended solids or air bubbles? What accuracy is required? How much head loss by the flowmeter is permissible? Is the flow corrosive or erosive? What types of flowmeter technologies can be accommodated in the location? What types of post installation service is available in area?
Is the measured process media a liquid or a gas? Is the flow measurement occurring in a pipe or in an open channel? What is the the flow rate? How much does the flow vary? If liquid, is it clean or does it contain suspended solids or air bubbles? What accuracy is required? How much head loss by the flowmeter is permissible? Is the flow corrosive or erosive? What types of flowmeter technologies can be accommodated in the location? What types of post installation service is available in area?
i think defects of pipe 1. bending of pipe 2. leakage of pipe
1.Flow Rate 2.Inside diameter of the pipe 3.Roughness 4.Corrosion and Scale Deposits 5.Viscosity of the liquid 6.Length of the pipe 7.Fittings 8.Straightness of the pipe
of course liquid can flow through a pipe?
A device for controlling the flow of liquid can sometimes be a pipe.
For a fluid flowing in a pipe, the pressure loss will be greater for a liquid flow due to more frictional losses on the pipe walls.
Riser
The velocity of flow in any pipe is determined by three things. The internal pipe diameter, the mass flow rate of the liquid and the fluid density.
An externally operated valve regulating the flow of a liquid inside a pipe.
That depends entirely on the viscosity of the liquid in the pipe ! Water would flow faster than oil !
In order to effectively answer this question more factors would need to be known. The most important factor being the type of liquid flowing through the pipe. Different liquids have a different rate of flow, even with varying elevations.
Velocity of fluid. Area of pipe.
You speed up the pump, which increases its pressure on the solid or liquid. Narrowing the pipe does not increase the pressure or flow rate, it only increases the speed at which the liquid or gas passes by a given point.
you have a severe pressure drop and a loss of velocity