Friction Factor Tests on High Density Polyethylene Pipe

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Utah State University DigitalCommons@USU Reports Utah Water Research Laboratory January 1988 Friction Factor Tests on High Density Polyethylene Pipe Steven L. Barfuss J.

edu/water_rep Part of the Civil and Environmental Engineering Commons, and the Water Resource Management Commons Recommended Citation Barfuss, Steven L. and Tullis, J.

1 Utah State University Reports Utah Water Research Laboratory January 1988 Friction Factor Tests on High Density Polyethylene Pipe Steven L. Barfuss J. Paul Tullis Follow this and additional works at: Part of the Civil and Environmental Engineering Commons, and the Water Resource Management Commons Recommended Citation Barfuss, Steven L. and Tullis, J. Paul, "Friction Factor Tests on High Density Polyethylene Pipe" (1988). Reports. Paper This Report is brought to you for free and open access by the Utah Water Research Laboratory at It has been accepted for inclusion in Reports by an authorized administrator of For more information, please contact

2 - - - ; Report on FRICTION FACTOR TESTS ON HIGH DENSITY POLYETHYLENE PIPE Submitted to: Prinsco, Inc. W Hwy 7 Prinsburg, MN By: steven L. Barfuss utah Water Research Laboratory utah State University Foundation Logan, Utah October 1988 Hydraulics Report No. 204

3 Report on Friction Factor Tests on High Density Polyethylene Pipe Submitted to: Prinsco, Inc. W Hwy 7 Prinsburg, MN By steven L. Barfuss utah water Research Laboratory utah state University Foundation Logan, Utah october 1988 Hydraulics Report No. 204

4 INTRODUCTION Friction factor tests were conducted at the Utah water Research Laboratory, at Utah state University on 12 inch, 15 inch and 18 inch diameter high-density polyethylene pipe (HOPE) with a ribbed interior. The pipe was furnished in 20 ft lengths. Pipe joints were sealed using Canusa heat shrink wrap. The heat shrink wrap was also used to connect the HOPE pipe to steel pipe in the laboratory to prevent leakage during testing. The pipes were tested for full pipe flow at velocities between about 2 and 15 fps. FACILITIES AND PROCEDURES One hundred-twenty feet of 18 inch, one hundred feet of 15 inch, and eighty feet of 12 inch HOPE pipe was tested. Figures A through C illustrate a schematic drawing of the installation. The pipe was connected to the 48 inch supply line reduced to 18 inch steel pipe at the laboratory. Water was supplied by gravity flow from a small reservoir. Pressure was controlled to remain within a 4 psi maximum. Flow was controlled with a downstream 16 inch butterfly valve in addition to the main upstream 48 inch supply valve. Three sets of piezometer taps were installed as shown in figures A through C. The first set of pressure taps was installed downstream from the first 40 ft, 24 ft, and 37 ft of the 12, 15, and 18 inch pipes respectively. This allowed adequate length to establish the velocity distribution in the pipe. Friction loss

5 2 measurements were taken between taps 1 and 2, 2 and 3, and 1 and 3. The flow rate was measured using the laboratory ultrasonic meter, which has been calibrated against the volumetric tanks. The volumetric tanks are traceable to the U.S. Bureau of Standards. The pressure differentials were measured with differential manometers containing a blue fluid (specific gravity = 1.75), and mercury (specific gravity = 13.56). The data were immediately processed with a computer to check the results before flow conditions were changed. At each pressure measurement location, two piezometers were installed in the pipe on opposite sides. A plexiglass block, fitted with a 1/411 brass fitting was connected to the thin pipe wall with body putty. An 1/8" tap hole was drilled through the pipe, and the interior surface carefully ground smooth with the inside of the pipe. Since the inside surface of the pipe was ribbed, the piezometer taps were drilled on the smooth stretch between ribs, with the hole nearer the downstream rib. RESULTS Experimental data are listed in Tables 1 through 3, and graphically displayed for Mannings "n", and friction factor "f" versus velocity in figures 1 through 6. For the 12, 15, and 18 inch pipe an average Manning "n" of , , and , and an average friction factor "f" of , , and was found respectively.

6 14 75' I 4' 48", " [I 24" 36" 1:1,8" 1 / OLD 12" HDPE PIP~ I PRESSURE TAP.,... 4 '2" HDPE PIPE 38,5''- 'II J Ii iii iii iii iii iii i III i IIIII iii i II i i_ ( 1 35" ~I ) PRESSURE TAP'2 ~"4 PRESSURE TAP oa--..,.. ~ I RIB SPACING= 3" RIB HEIGHT= -1/8" I.D.= 12" FIG A. 12" HDPE PIPE SETUP w

7 14 75' -I 4' 48",, I I~"""""---I 36" 1-118" r-" +. ~ f 15" HDPE PIPE", PRESSURE TAP # ' PRESSURE TAP #2... IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIID I IIIIIIIIIIIIIIIII~I. ~ 40.1' _I PRESSURE TAP N W II RIB SPACING= 2 5/8" RIB HEIGHT = -5/32" I.D.= 15.2" FIG B. 15" HDPE PIPE SETUP.j::'-

8 I... 75' ~ 4' 48" I - 36" PRESSURE TAP #1 "-. I 39.8' [] 24" '-118" I (... :; r-1 RIB SPACING= 3" RIB HEIGHT = -1/8" I.D.= 18" FIG C. 18" HDPE PIPE SETUP VI

9 TABLE 1 Test data for friction test on 12" plastic pipe. UTAH WATER RESEARCH LABORATORY DATA SHEET FOR FRICTION LOSS rest Prinsco, Inc. PIPE: 12" HOPE pipe dia in. Date: 7 Oct 88 Area ft sq Tested by: Steven L. Barfuss lengthl = 38.5 ft. length2= 40.1 tt. I engt h 3= f t. Sonic Dlff Mano Mano Actual Run Q ave. LEFT RIGHT Conv DP Q V Darcy No. cfs cm. em. to feet feet cfs FPS f Average Average Average Average Average Average Average Average AverageO Average Manning n

10 7 0.1 I I n I Velocity Fig 1. Mannings n vs. velocity for 12" diameter HOPE pipe.

11 8 0.1 I I- I- I- -. Y Velocity Fig 2. Friction f vs. velocity for 12" diameter HDPE pipe.

12 TABLE 2 Prinsco, Inc. PIPE: 15" HOPE Date: 4-0ct 88 Tested by: Steven L. Barfuss Test data for friction test on 15" plastic pipe. UTAH WATER RESEARCH LABORATORY DATA SHEET FOR FRICTION LOSS TEST pipe dia.= 15.2 Area= 1.26 lengthl = 36.8 length2= 40.1 I engt h3 = 769 Sonic o Iff Mano Mano Actual Run Q ave. LEFT RIGHT Con v DP Q V Darcy No. cfs cm. cm. to feet feet cfs FPS f Average Average Average Average Average Average Average Average Average Average in. ft sq ft. tt. f t. Manning n

13 ( Velocity 100 Fig 4. Friction f vs. velocity for 15" diameter HOPE pipe.

14 n ,.. 10 Velocity 100 Fig 3. Manning n vs. velocity for 15" diameter HDPE pipe.

15 TABLE 3 Prinsco, Inc. PIPE: 18" HOPE Date: 2-0ct-88 Tested by: Steven L. Barfuss Test data for friction test on 18" plastic pipe. UTAH WATER RESEARCH LABORATORY DATA SHEET FOR FRICTION LOSS TEST pipe dia.= 18.0 in. Area= 1.8 ft sq lengthl= 39.8 ft. length2::: 39.8 ft. I engt h 3= f t. Sonic Dlff Mano Mano Actual Run Q ave. LEFT RIGHT Conv DP Q V Darcy No. efs cm. em. to feet feet efs FPS f AverageO Average Average Oct Average Average Average Average Average Average Manning n

16 n I Velocity Fig 5. Manning n vs. velocity for 18" diameter HOPE pipe.

17 !. Sf Velocity Fig 6. Friction f vs. velocity for 18" diameter HOPE pipe.

Hydraulics Guide. Table 1: Conveyance Factors (English Units)... 7 Table 2: Conveyance Factors (Metric Units)... 8

Hydraulics Guide. Table 1: Conveyance Factors (English Units)... 7 Table 2: Conveyance Factors (Metric Units)... 8 Table of Contents 1.1 Index of Tables... 1 1.2 Index of Figures... 1 1.3 Overview of Hydraulic Considerations... 2 1.4 Discharge Curves... 2 1.5 Conveyance Method... 5 1.6 Flow Velocity Considerations...