Friction Loss Table - Pacific Pump and Power

1 Pacific Pump and Power91-503 Nukuawa StreetKapolei, Hawaii 96707 Phone: (808) 672-8198 or (800) 975-5112 Fax: (866) 424-0953 Email: and GeneratorsRentals * Sales * Service * Operations(808) 672-8198 Friction loss in Pipe1 Table of ContentsEmail: Sales Service Operations(808) 672-8198 Friction loss in loss per 100 Feet of Pipe due to Friction loss in Pipe loss Estimates based on Pipe of Fittings to Flow of Fluids in Equivalent Length of l iDisclaimerPacific Pump and Power Inc. accepts no responsibility for any losses or damage orother matters arising from the use of this information. The use of informationand advice contained is used solely at the risk of the Due to FrictionLosses Due to Elevation ChangeFresh WaterSalt Water1 foot of head = psi1 foot of head = psi = feet of psi = feet of head4.

2 The length of the pipe:The Friction losses are cumulative as the water travels through thelength of pipe. The greater the distance, the greater the Friction losses will pressure can be expressed as either psi (pounds of pressure per square inch) or feetof head. A column of water 1 foot high exerts psi at the bottom and therefore 1 psi isequivalent to feet of head. This means that for every foot of elevation change from thepump to the discharge point, the corresponding change in pressure will be loss in PipeAs water moves through the pumping system, pressure losses occur due to water contact withpipes, valves, and fittings. The four factors that determine Friction losses in pipe are:1. The velocity of the water:Water velocity is measured in feet per second. As velocityincreases, pressure losses increase.

3 Velocity is directly related to flow rate. An increase ordecrease in flow rate will result in a corresponding increase or decrease in The size (inside diameter) of the pipe:Smaller pipe causes a greater proportion of thewater to be in contact with the pipe, which creates Friction . Pipe size also affects a constant flow rate, decreasing pipe size increases the water s velocity, whichincreases The roughness of the inside of the pipe:Pipe inside wall roughness is rated by a C factor, which is provided by the manufacturer. The lower the C value, the rougher the insideand the more pressure loss due to 1 " "1"1- " 1- "2"2- "3"4"5"6"8"10"12" :1. Values shown above are used in the Hazen-Williams Equation for flow in of head loss values shown in the tables were developed using theHazen-Williams Feet of head loss values are subject to the following conditions:a) Pipes carrying clear water at approximately 60 F ( C).

4 B) Pipes are flowing ) Velocities of water are generally less than 10 feet per : HDPE is commonly sized by outside diameter. If in doubt, use the next smaller pipe Diameter (Inch)Flow (GPM)Head loss / 100 Feet Pipe Due to Friction (C = 150) Friction loss TableC = 150 for High Density Polyethylene Pipe (HDPE)Page 2 Steel/CopperEquivalent feet of pipe caused by joint @ diam. InchFitting 11- 1- 22- 90 Std Long Street Std Street T Flow T Flow Valve - feet of pipe caused by joint @ diam. InchFitting 11- 1- 22- 90 Std Elbow45678910 Std T Flow Run4445678 Std T Flow Branch78912131720 Friction loss in Pipe FittingsPage 3 Note: Determine total run of hose/pipe in pumping system and calculate Friction lossat a given flow rate. Add Friction loss in head feet to vertical elevation from suctionpoint to discharge point to determine total dynamic loss Estimates based on Pipe LengthsPage 4 FlowHose SizeVelocity100'500'1000'1500'2000'1004" ' / '4'8'12'16'2004" ' / ' '29' '58'3004" ' / ' '61' '122'4004" ' / '52'104'156'208'4006" ' / '14'21'28'5006"56'/ sec22'11'22'33'44' / " ' / ' '31' '62'7006" ' / ' '41' '82'8006" ' / '26'52'78'104'8008" ' / '26'9006" ' / '33'66'99'132'9008" ' / '32'10006"11 1' /78'39'78'117'156'10006" ' / '39'78'117'156'10008" ' / '30'40'11008" ' / ' '23' '46'12008" ' / ' '27' '54'13008" ' / ' '31' '62'14008" ' / '18'36'54'72'15008" ' / ' '41' '82'16008" ' / ' '47' '94'18008" ' / '28'56'84'112'180012" ' / '16'20008" ' / '35'70'105'140'200012" ' / ' '18'250012" ' / ' '15' '30'300012" ' / ' '21' '42' / " ' / '

5 '27' '54'400012" ' / ' '35' '70'Note:Numbers in bold and italics represent dynamic head levels that exceed pumppump capabilities at that 4 Page 5 Page 5