8 replies to this topic

[Santoshp9]

Dear All,

 I am having 6" pipe line through which  200 m3/hr water is flowing.If I put 1/2" inch tapping on that pipe,can I get a flow of 200m3/hr through that 1/2" tapping.

if answer is no,then why ? & what are the reasons ?

 

 

Regards,

Santosh

 

[fallah]

santosh,

 

Theoretically speaking, the flow of water through a 1/2" pipe can be even higher than 200 m3/hr, but in real world the huge resulting momentum will destroy the pipe and associations such as elbows and valves...

[shan]

The answer is "No Answer" because you did not specify the pressure differential and pipe length.

[samayaraj]

For your question, the answer is YES. But in practical, its highly not recommended. As per your data,velocity for 200 m3/hr through 15NB line is approximately 315 m/sec. This is much much more to erode the pipe and other components instantly. If you assume there is no pressure drop and elevation difference, you need minimum 496 bar differential pressure across the 15NB pipe. In real case, differential pressure will be even very higher due to pressure drop.

#Samayaraj

Edited by samayaraj, 17 April 2015 - 07:58 PM.

[curious_cat]

 As per your data,velocity for 200 m3/hr through 15NB line is approximately 315 m/sec. 

 

That's real close to supersonic. 

Edited by curious_cat, 17 April 2015 - 10:40 PM.

[latexman]

It's about Mach 0.2; the speed of sound in liquid water is about 1500 m/sec.

[shan]

API 14E Table 2.3 Typical Flow Velocity: 3m/s for discharge velocity.

[Kiran T]

Dear All,

 I am having 6" pipe line through which  200 m3/hr water is flowing.If I put 1/2" inch tapping on that pipe,can I get a flow of 200m3/hr through that 1/2" tapping.

if answer is no,then why ? & what are the reasons ?

 

 

Regards,

Santosh

From equation Q= VA 

Find Velocity and convert it to pressure, if your pipe and joints capable to withstand it than u can use 1/2 " pipe line.....

[farid.k]

I have an experience that, there is one piping and have 1 branch that goes to HEX A and HEX B respectively. The piping all is 6”. The branch is not symmetrical. After installation, based on data, the flow that goes to HEX A and HEX B is different which more favor to HEX A which is closer. After some investigation done, it says that not symmetrical is the cause of unequalled flow to both HEX. After re-rout back the piping and make it symmetrical, the flow that goes to HEX A and B is equally distributed.

 

For this case, I don't think you will get 200m3/h for that small piping after do for tie-in ½”. the reason is, let say you have a big pipe and you make a small hole on that piping, do you think you will get same flow rate that goes to small hole as per inside the main pipe? I don’t think so. If you make a hole that same size with the pipe size, then it will make sense to get same flow rate as per inside main pipe.

The only you can get 200m3/h for that small ½” is when you totally close the 6” piping and of course the velocity will be very high.

Edited by farid.k, 18 May 2015 - 09:08 AM.