Piping Discharge Friction Loss

Figure out the total loss of flow caused by friction in length of pipe and in pipe fittings. #1

Pipe Friction Loss Calculator of Schedule 40 New Steel Pipe
1. Enter Total Length (i.e., Horizontal, Vertical, Diagonal, etc.) of Discharge Pipe. feet 2. Select Diameter Size of Discharge Piping. Select... ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) inches #2 3. Select Gallons per Minute corresponding to discharge pipe size (step 2). Pipe Size? GPM	Friction Loss of Head feet per 100 ft. of pipe
4. Equivalent length (in feet) for pipe fittings. The calculator will assume the "diameter size" is the same for all pipe fittings as selected in Step 2. However, you can override any of the values for pipe fittings (if you choose) simply by selecting a different diameter size from the drop down list of any fitting. Also, enter the quantity or amount of fittings for each that apply. Type of Fitting Diameter Size Equivalent Pipe Length Quantity Total Equivalent Length Regular 90° elbows - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Long radius 90° elbows - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Regular 45° elbows - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Tee (T) Line Flow - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Tee (T) Branch Flow - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Globe valves - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Gate valves - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Swing check valves - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Bell Mouth Inlet - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Square Mouth Inlet - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Inward Projecting Pipe - ¾ (0.75) 1 1¼ (1.25) 1½ (1.5) 2 2½ (2.5) 3 4 5 (*) in. → ft. × = ft. Total length of pipe fittings: ft.
Total Pump Discharge Pipe Loss: feet of head, or equivalently psig #3
Press "Reset All" to CLEAR ALL calculations and enter new values.

Notes

1. Calculator based on average values of pipe friction for new, schedule, wraught iron, steel or galvanized pipe. No allowance for aging of pipe is included.
2. 5" pipe size diameter is flanged.
3. WARNING: These values do NOT include other sources of pressure that pump discharge must overcome such as, vertical lift; back pressure; safety margin; boiler operating pressure; that are needed to determine pump discharge pressure. Refer to MathWizard™ sizing programs for determining pump discharge.

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