Question { 3704 }

How can measure flow in oil line?which type of transmitter
is generally used?

Answer

concept:flow is directly proportional to the square root
of differential pressure. You can use differential pressure
transmitter with orifice plate,orifice plate is used for
create DP in oil flow line.

Question { TNPL, 7481 }

why most of the DP transmitters using maximum range as
0-2500mmwc?why not 1000 2000 3000 4000mmwc

Answer

0-2500mmwc its not a standard range of transmitters, range of transmitters defending upon process requirements.

but flow transmitters you may see most of transmitters are having 0-2500mmwc, this is also fixed by process flow requirements, in this case, differential pressure may same, but size of orifice, size of the pipe, density of the flowing liqiud,quantity of the flow may differ.

Question { Sugar Factory, 8059 }

T.x range -0.1 to 0.2 milibar,so how much mili ampear at 0.1 milibar?

Answer

TX range is -0.1mbar to 0.2mbar

span= maximum-minimum
= 0.2-(-0.1)
= 0.3

mA = given value- zero value/ span x 16+4

= 0.1-(-0.1)/0.3 x 16+4

= 0.2/0.3 x 16+4

= 14.66 mA

Question { CCIE, 5661 }

What is the cv of a control valve?

Answer

No of gallons water flowing through a fully open control
valve with 1 psi pressure drop at 60 deg F.

Question { Hindalco, 16853 }

Why Flow measurement has to use Square Root

Answer

Flow varies directly proportional to the sq.root of differential pressure.thatswhy we are using sq root for flow measurement.

Question { Asian Paints, 6146 }

if we open the inlet of an air regulator ,how it will affect
the out put of regulator? (out put of regulator is using to
operate an on-off valve.it is an air to open valve,and valve
is in open position.my doubt is air regulator will hold the
valve in open or not,if there is no consumption or leak in
regulator out put side ,we only loose the input pressure.)

Answer

if you open the inlet of afr, valve ramains in open condition only, bcoz afr hold the output air pressure until u drain from regulator. and you are telling that while you are going to open the inlet of air regulator your valve is in open position, that means there should be air in outlet of regulator. bcoz your valve is air to open valve. if there is no air it should be in close condition.

Question { 4840 }

what is flow

Answer

Flow defined as movement of substance one point to another.