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rHYDRAULIC DESIGN PART 2

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EXAMPLE 2, PUMPED AUTOMATIC PRESSURE PIPELINE DESIGN

Given: Flow rate from pump to station 120+00 is 8 gpm Existing well will produce 15 gpm; at 8 gpm well will drawdown to elevation

150 ft. Pipeline requirement will be 8 gpm. Clearance head (CH) for pipeline is 23.1 ft. Delivery pressure at all tanks shall be 20 psi. Cut-in, cut-out pressure range is 30 psi.

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Steps in the design, Solution one:

1. Plot the profile of the proposed pipeline.2. Determine where the most critical point (CP) in the pipeline is located for minimum pressure.3. Determine where the most critical point (CP) in the pipeline is located for the maximum pressure.4. Select a test pipe size.5. Plot the hydraulic grade line (HGL), start at your CP for minimum pressure and plot both directions. Evaluate your pipe selection. Repeat if necessary. And finalize the pipe size and pressure rating.6. Calculate static pressure at all CP points.7. Calculate the Total Dynamic Head (TDH) so that you can size a pump.8. Size the pump.9. What is the cut-in and cut-out head/pressure?10. Size the pressure tank.

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EXAMPLE 3, TIMER OR MANUALLY OPERATED PRESSURE SYSTEM

Given: Flow rate from pump to station 120+00 is 8 gpm Existing well will produce 15 gpm; at 8 gpm well will drawdown to

elevation 150 ft. Pipeline requirement will be 8 gpm. Clearance head (CH) for pipeline is 23.1 ft. Delivery pressure at all tanks shall be 20 psi. Cut-in, cut-out pressure range is 30 psi.

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Steps in the design, Solution one:

1. Plot the profile of the proposed pipeline.2. Determine where the most critical point (CP) in the pipeline is located for minimum pressure.3. Determine where the most critical point (CP) in the pipeline is located for the maximum pressure.4. Select a test pipe size.5. Plot the hydraulic grade line (HGL), start at your CP for minimum pressure and plot both directions. Evaluate your pipe selection. Repeat if necessary. And finalize the pipe size and pressure rating.6. Calculate static pressure at all CP points.7. Calculate the Total Dynamic Head (TDH) so that you can size a pump.8. Size the pump.9. What is the cut-in and cut-out head/pressure?10. Size the pressure tank.

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rEXAMPLE 4, PRESSURE REDUCER

Given: Flow rate at 30+00 is 10 gpm Pipeline requirement will be 10 gpm to station 55+00

(tank location) and 5 gpm to station 90+00. Clearance head (CH) for pipeline is 23.1 ft. Delivery pressure at all tanks shall be 20 psi minimum

and 80 psi maximum.

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Steps in the design, Solution one:

1. Plot the profile of the proposed pipeline.2. Determine where the most critical point (CP) in the pipeline is located for minimum pressure.3. Determine where the most critical point (CP) in the pipeline is located for the maximum pressure.4. Select a test pipe size.5. Plot the hydraulic grade line (HGL), start at your CP for minimum pressure and plot both directions. Evaluate your pipe selection. Repeat if necessary.6. Calculate static pressure at all CP points.

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