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Lecture 15 TDH and NPSH. Dr. C. L. Jones Biosystems and Ag. Engineering . Suction Lift. Dr. C. L. Jones Biosystems and Ag. Engineering . Suction Head. Dr. C. L. Jones Biosystems and Ag. Engineering . NPSHR. Dr. C. L. Jones Biosystems and Ag. Engineering .

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lecture 15 tdh and npsh
Lecture 15 TDH and NPSH

Dr. C. L. Jones

Biosystems and Ag. Engineering

suction lift
Suction Lift

Dr. C. L. Jones

Biosystems and Ag. Engineering

suction head
Suction Head

Dr. C. L. Jones

Biosystems and Ag. Engineering

npshr
NPSHR

Dr. C. L. Jones

Biosystems and Ag. Engineering

npsh net positive suction head
NPSH (net positive suction head)

Dr. C. L. Jones

Biosystems and Ag. Engineering

npsha
NPSHA

Dr. C. L. Jones

Biosystems and Ag. Engineering

slide7

NPSHA

Dr. C. L. Jones

Biosystems and Ag. Engineering

static discharge head
Static Discharge Head
  • Static Discharge Head = vertical distance from pump centerline to the point of free discharge or the surface of the liquid in the discharge tank.

Dr. C. L. Jones

Biosystems and Ag. Engineering

total static head
Total Static Head
  • Vertical distance between the free level of the source of supply and the point of free discharge or the free surface of the discharge liquid.

Dr. C. L. Jones

Biosystems and Ag. Engineering

total dynamic discharge head
Total Dynamic Discharge Head
  • Static discharge head + velocity head at pump discharge flange plus discharge line friction

Total Dynamic Discharge Head (TH or TDH) (this is what we design for!!!)

  • Total dynamic discharge head – total dynamic suction head (tank above suction)…. Or….
  • Total dynamic discharge head + total dynamic suction lift (tank below suction)

Dr. C. L. Jones

Biosystems and Ag. Engineering

total dynamic suction lift or head
Total Dynamic Suction Lift or Head
  • (fluid below suction) Static suction lift - velocity head at suction + total friction head in suction line
  • (fluid above suction) Static suction head + velocity head at pump suction flange – total friction head in suction line
  • Velocity head = energy of liquid due to motion, Usually insignificant

Dr. C. L. Jones

Biosystems and Ag. Engineering

slide12

Total Dynamic Discharge Head (TH or TDH) (this is what we design for!!!)

TDH includes friction losses due to piping and velocity

Dr. C. L. Jones

Biosystems and Ag. Engineering

example problems
Example problems

Dr. C. L. Jones

Biosystems and Ag. Engineering