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Calculating Total Dynamic Head (TDH) on a Flooded Suction Application

Calculating TDH

Flooded Suction Application

100 GPM of HCL at 150 F

Find the Total Dynamic Head (TDH):


TDH = Total Discharge Head - Total Suction Head


Suction:


Total Suction Head = Static - Friction


Suction Static Head---------------------------------------- 10'


Friction Suction Side - See Friction Resistance Chart Here-->


Total Length of 3" Pipe----------------------17'


See Friction Resistance Fitting Chart Here-->


(1) 90 deg 3" Elbow = 7.7' of Pipe----------7.7'


(1) 3" Gate Valve = 1.6' of Pipe-------------1.6'


Total Equivalent Length of 3"Pipe--------26.3'


Friction = 4.96 x 26.3 / 100--------------- 1.3'


Total Suction Head = 10'(Static) - 1.30'(Friction) = 8.7'


 


Discharge


Total Discharge Head = Static + Friction)


Discharge Static Head--------------------------------------60'


Friction Discharge Side-See Friction Resistance Chart Here-->


Total Length of 2" Pipe------------------------172'


See Friction Resistance Fitting Chart Here-->


(2) 45 deg 2" Elbow = 4.8'(2x2.4) of Pipe ---4.8'


(2) 90 deg 2" Elbow = 10.4(2x5.2)of Pipe---10.4'


(1) 2" Gate Valve = 1.1' of Pipe---------------1.1'


(1) 2" Check Valve = 14' of Pipe---------------14'


Total Equivalent Length of 2" Pipe ----------202.3'


Friction = 35.8 x 202.3/100-----------------72.4'


Total Discharge Head = 60'(Static) + 72.4'(Friction) =132.4'


Total Dynamic Head = Total Discharge Head - Total Suction Head= 132.4' - 8.7' = 123.7'


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