Dynamic Pressure Loss Worksheet
An interactive tool to determine the dynamic pressure at the worst-case sprinkler in a sample irrigation system.
How to Use This Worksheet
Study the Diagram
Examine the diagram closely for important details like pipe sections, water pressure readings, spacing measurements, and any notes or annotations that provide crucial calculation data.
Friction Loss Worksheet: Use the Tools
Pressure Loss Charts: Click the "Pressure Loss Charts" button to access reference tables. Values can be copied with a single click for faster workflow.
Calculator: Use the built-in calculator for quick arithmetic operations during your calculations.
Both of these tools are located on the Friction Loss Worksheet header.
Check Your Work
The "Check Answer" button only activates when all required pipe sections have been added and all fields are completed. This ensures your calculations are comprehensive.
Understanding the Math
Interested in the calculation formulas? Check the "Calculation Reference" section on the right side of the worksheet for detailed mathematical explanations.
Pro Tips
- • Use "Show Answers" if you need help - answer values can be copied with a click
- • The "Next" button clears all calculations and advances to the next worksheet
- • Enable "Carry over selections" to speed up data entry for similar pipe sections
- • Auto-calculate mode automatically computes losses as you enter data
Hydraulic Worksheet (Diagram 1)
Determine the dynamic pressure at the "worst-case sprinkler" using the diagrams below. Note: Two diagrams are used to reduce crowding.
Friction Loss Worksheet
| Section | Type | Size | GPM/Flow | Length | PSI Loss / 100 | PSI Loss this item | |
|---|---|---|---|---|---|---|---|
| Total PSI Loss in Pipes: | |||||||
Calculation Reference
These are calculations you must learn and memorize for accurate friction loss estimation. You will be doing these calculations frequently on your Exam.
1. Section PSI Loss
Formula: Length ÷ 100 × Chart_Value
Calculator Tip: Convert feet to decimal factor first. For 150', enter 150 ÷ 100 = 1.5. Then multiply 1.5 × Loss/100.
2. Fitting Loss (10%)
Formula: Total_Pipe_Loss × 0.10
Calculator Tip: Sum all your individual pipe section losses (the result in the table footer). Leave that number on your screen and hit × .1 to find fitting loss.
3. Remaining Pressure
Formula: Start_PSI - Pipe_Loss - Fit_Loss