Pipeline, elbow pressure drop
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What is typically considered for the pressure drop per 100 meters of pipeline, and what is the value considered for the pressure drop caused by one elbow?
There’s a small software on the forum for calculating pressure drop; look for it
For smooth pipes, the pressure drop over a length of hundreds of meters is approximately 0.2 kg/cm2 (depending on the specific case); ζ = f×l÷d. For standard elbows, ζ is around 40, while for right-angled pipes it is around 80. This is provided for your reference
The pressure drop in straight pipes can be calculated based on flow velocity and density, using the formula Δp=λ*L*w*w/d/ρ/2. Here, Δp represents the pressure loss in the pipe, in Pa; λ is the friction coefficient, with a value of 0.02 for metal pipes; w is the flow velocity, in m/s; d is the inner diameter of the pipe, in m; L is the length of the pipe, in m; and ρ is the density, in kg/m3. The calculation for the resistance caused by bends is more complex. If high precision isn’t required, the total pressure loss due to all bends in a pipe can be estimated as 40% of the total pressure loss in a straight pipe
30 sodium hydroxide, density 1350, pipe diameter 40, length 400 meters, 20 elbows