3 replies to this topic

[zamakaze]

hlo,

 

im trying to calculate the pr. drop in vertical piping for gas.

i have a vertical section where gas goes down in elevation 5 ft

the pressure at starting point is 85 psig

since there is fall of 5 ft i assume pr. gain can be calculate as = rho x g x h2-h1 where h2 is 5ft , h1 is 0 ft

for frictional drop can we just use the darcy eqn for vertical or there are some other considerations??

attachd sktch

 

 

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[latexman]

That looks right.  It's the Bernoulli equation with friction included.   Don't forget the fittings (2 elbows).

[breizh]

hi,

The head loss due to the vertical part (altimetry) is very minimum ,negligable .  Bernoulli equation to apply. 

Don't forget the elbows in your calculation .

Good luck

Breizh  

[fallah]

 

im trying to calculate the pr. drop in vertical piping for gas.

i have a vertical section where gas goes down in elevation 5 ft

the pressure at starting point is 85 psig

since there is fall of 5 ft i assume pr. gain can be calculate as = rho x g x h2-h1 where h2 is 5ft , h1 is 0 ft

for frictional drop can we just use the darcy eqn for vertical or there are some other considerations??

attachd sktch

 

Hi,

 

For gaseous fluid there is no significant difference in pressure drop calculation for vertical and horizontal lines...