Pipe Diameter vs Pressure

Basics :

Pressure is Directly proportional to Temperature and Inversly proportional to Volume

P=T/V

P= Pressure

T= Temperature

V=Volume

Decide which is constant.

will the pressure of air (or any gas), flowing through a pipe, increase if the pipe dia is reduced ??

If the pipe diameter is reduced the velocity and losses will increase and therefore less pressure at the outlet.

is there any other way of increasing the pressure of air flowing through a pipe ?

If the diameter is increased you might save on some of th losses resulting in a higher pressure. What rise do you need?

The pressure can also be increased by increasing the pressure (within limits of the equipment) at the source

thnks for the reply, i hv a compressor line in my lab which gives a maximum of 200 KPa, but i require a pessure of around 400 KPa for my experiment, is there any way to get this done ?

Yes, get another compressor with correct rating.

If you'd given that extra detail up front it would make it easier for people to help you.

Cheers...........Codey

if you have a compressor 120v and if it can operate on 220v then only it is possible you can get 400 kpa out of 200 kpa. If you can eat double the food you can get brainy at half the time.

OK dude, all you need is to get an Air Tank or a Container that could store Air upto 450KPa. Connect the compressor line to the inlet with a non-return valve rated for the desired pressure, from the outlet you draw the pressure you need. Ensure that the air tank is designed for the required pressure and all components (Pressure Guage, PRV etc.) do meet the intended service of 450KPa.

Hope this helps!

Codemaster is right. he still cannot get above 200 kpa irrspective of whatever he does, unless he gets a 400 kpa compressor.

I believe what you are saying is Keep the air tank line [ of 450Kpa] in parallel to the normal usage line [ of 200Kpa]. Keep the Outlet V/v of Air tank line closed, after attaining the required pressure. Design the m3 capacity of air tank as per the requirement for the experiment.

But even in such case, Isnt it that the compressor should have discharge pressure specification of 450Kpa for this air tank to be successful?

But still I believe With the same flow & constant temp, the Pressure can be increased by reducing the dia. And regarding the increase of friction losses, it may only reduce the increased pressure to a slighter extent.

Because increasing the pressure at the source is not a feasible and easy solution, especially when the requirement is for a brief period

the Pressure can be increased by reducing the dia.

for a brief period we will experiencing an explosion... nothing to write home to mom about.

<...will the pressure of air (or any gas), flowing through a pipe, increase if the pipe dia is reduced ?...>

It will reduce slightly, according to Bernoulli's Equations.

<...is there any other way of increasing the pressure of air flowing through a pipe ?...>

Install a compressor?

Dear user,

The Pressure and Volume is related by the following Equations.

1. P x V = C, where P is pressure, V is Volume and C is Constant. This is as per BOYLE's LAW, in Physics.

2. (P1 x V1)/T1 = (P2 x V2)/T2 This as per THERMODYNAMICS.

DHAYANANDHAN.S