Flow Measurement Devices Pdf

Where a measuring accuracy of 5 is sufficient these lengths should be a minimum of ten and three equivalent pipe diameters respectively.

Flow measurement devices pdf.

Accurate flow measurement is very important for proper and equitable distribution of water among water users. In a differential pressure drop device the flow is calculated by measuring the pressure drop over an obstructions inserted in the flow. Because they are used for domestic water measurement piston meters also known as rotary piston or semi positive displacement meters are the most common flow measurement devices in the uk and are used for almost all meter sizes up to and including 40 mm 1 1 2 in. In general we can split the fluids into two classes.

The flow measuring device including flow measurement valves should be positioned upstream of any associated valve and installed with a reasonable length of straight pipe upstream and downstream of the device. Clean or dirty wet or dry hazardous corrosive or safe single or multi phase laminar of turbulent varying pressure contents provided in this presentation are for reference purpose the detailed theory to be read written from respective text book class notes varying pressure varying temperature. Information concerning the volume of available water is very helpful in planning. Crude methods of flow measurement but as you will see these crude methods are still in use today.

Industrial flow measurement industrial flow measurement basics and practice d184b075u02 rev. Cryogenic flow metering techniques 1. The piston meter operates on the principle of a piston rotating within a. 1 1 types of flow measurement devices fluid flow devices fall into a number of device categories as well as fluid classes.

A venturimeter is a device meant for measuring the quantity of a liquid flowing through a pipe. Fixed restriction variable head type flow meters using different sensors like orifice plate venturi tube flow nozzle pitot tube dall tube quan. Numerous practical details provide the user with valuable information about flow metering in industrial applications. Pressure drop devices based on bernoulli principle a venturi b orifice plate c pitot tube 2.

Hot wire anemometers based on h f v 4. Flow measurement pdf 1. In its simplest form the device consists of a short converging section leading to a throat and followed by a diverging section. The differential pressure flow meter is based on the bernoulli equation where the pressure drop and the further measured signal is a function of the square flow speed.

Friction pressure drop packed screens 3. Types of flow meters and their applications flow measuring device 1. 2 industrial instrumentation c 8 n ind book1 1 they are. Flow measurements types of flow encountered.

Acoustic flow meters based on doppler effect 5. Mechanical type flow meters. Flow measuring devices are generally classified into four groups.