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

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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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