flow calculation

[aboud]

how can calculate flow in common pipe for two different OD ,and pressure pipe crossing in 90 , 45 angle

[admin]

You should calculate flow for each pipe diameter

[amardeep]

calculate flowrate for individual diameter by Q=V*A.

for pressure drop at bends(90°& 45°) ∆P=kv2/2g

where Kis resistance coeeficient

k ------ 90° bend ----- 0.6-0.8
k ------ 45° bend ----- 0.375

As per my knowledge that is the procedure to calculate pressure drop...If anyone knows other option please suggest us.