# Pipe Friction Factor – Online Calculator

January 14, 2018

### Introduction

After a long time, I am returning to a subject that has bothered me many times in the past: friction factor. This time, however, I tried to switch my typical tools, so instead of an Excel/VBA solution, you will get a free online tool. The tool calculates the pipe friction factor based on Churchill’s equation. If you have read any of my previous posts, you will probably remember that Churchill’s equation is valid for the entire Reynolds range (e.g. any flow type). The equation involves the calculation of two intermediate values that are used in the final equation.

### Pipe friction factor calculator

#### Inputs

The roughness of the pipe material [μm]

Internal Diameter of the (circular) pipe [mm]

Discharge [m³/h]

Kinematic Viscosity of the fluid flowing through the pipe [cSt = 10−6 m²/s]

#### Results

Fluid Velocity [m/s]

Reynolds [-]

Type of flow [-]

Friction Factor [-]

Table 1: Suggested roughness values for several pipe materials.

Pipe Material Roughness (μm)
Aluminum 1.5
Asbestos cement 25
Cast iron (asphalted) 122
Cast iron (uncoated) 254
Concrete (steel forms, with smooth joints) 180
Drawn brass 1.5
Drawn copper 1.5
Drawn tubing – glass, brass, plastic 1.5
Fiberglass 5
Fiberglass with epoxy 3
Galvanized iron 152
Polyethylene 3
PVC 1.5
Seamless commercial steel (galvanized) 150
Seamless commercial steel (light rust) 250
Seamless commercial steel (new) 25
Stainless steel 45
Welded steel 600
Wood stave 600
Wrought iron 45

Table 2: Suggested kinematic viscosity values for various liquids.

Liquid Temperature (C) Kinematic Viscosity (cSt)
Acetaldehyde CH3CHO 16.1 0.305
20 0.295
Acetic acid – vinegar – 10% CH3COOH 15 1.35
Acetic acid – 50% 15 2.27
Acetic acid – 80% 15 2.85
Acetic acid – concentrated glacial 15 1.34
Acetic acid anhydride (CH3COO)2O 15 0.88
Acetone CH3COCH3 20 0.41
Alcohol – allyl 20 1.6
Alcohol – butyl-n 20 3.64
Alcohol – ethyl (grain) C2H5OH 20 1.52
37.8 1.2
Alcohol – methyl (wood) CH3OH 15 0.74
0 1.04
Alcohol – propyl 20 2.8
50 1.4
Aluminum sulfate – 36% solution 20 1.41
Ammonia -17.8 0.3
Aniline 20 4.37
10 6.4
Asphalt RC-0, MC-0, SC-0 25 159-324
37.8 60-108
Automatic crankcase oil SAE 10W -17.8 1295-max
Automatic crankcase oil SAE 10W -17.8 1295-2590
Automatic crankcase oil SAE 20W -17.8 2590-10350
Automatic crankcase oil SAE 20 98.9 5.7-9.6
Automatic crankcase oil SAE 30 98.9 9.6-12.9
Automatic crankcase oil SAE 40 98.9 12.9-16.8
Automatic crankcase oil SAE 50 98.9 16.8-22.7
Automotive gear oil SAE 75W 98.9 4.2 min
Automotive gear oil SAE 80W 98.9 7.0 min
Automotive gear oil SAE 85W 98.9 11.0 min
Automotive gear oil SAE 90W 98.9 14-25
Automotive gear oil SAE 140 98.9 25-43
Automotive gear oil SAE150 98.9 43 – min
Beer 20 1.8
Benzene (Benzol) C6H6 0 1
20 0.74
Bone oil 54.4 47.5
100 11.6
Bromine 20 0.34
Butane-n -1.1 0.52
0.35
Butyric acid n 20 1.61
Calcium chloride 5% 18.3 1.156
Calcium chloride 25% 15.6 4
Carbolic acid (phenol) 18.3 11.83
Carbon tetrachloride CCl4 20 0.612
37.8 0.53
Carbon disulfide CS2 0 0.33
20 0.298
Castor oil 37.8 259-325
54.4 98-130
China wood oil 20.6 308.5
37.8 125.5
Chloroform 20 0.38
60 0.35
Coconut oil 37.8 29.8-31.6
54.4 14.7-15.7
Cod oil (fish oil) 37.8 32.1
54.4 19.4
Corn oil 54.4 28.7
100 8.6
Corn starch solution, 22 Baumé 21.1 32.1
37.8 27.5
Corn starch solution, 24 Baumé 21.1 129.8
37.8 95.2
Corn starch solution, 25 Baumé 21.1 303
37.8 173.2
Cottonseed oil 37.8 37.9
54.4 20.6
Crude oil 48o API 15.6 3.8
54.4 1.6
Crude oil 40o API 15.6 9.7
54.4 3.5
Crude oil 35.6o API 15.6 17.8
54.4 4.9
Crude oil 32.6o API 15.6 23.2
54.4 7.1
Decane-n 17.8 2.36
37.8 1.001
Diethyl glycol 21.1 32
Diethyl ether 20 0.32
Diesel fuel 2D 37.8 2-Ιουν
54.4 1.-3.97
Diesel fuel 3D 37.8 6-11.75
54.4 3.97-6.78
Diesel fuel 4D 37.8 29.8 max
54.4 13.1 max
Diesel fuel 5D 50 86.6 max
71.1 35.2 max
Ethyl acetate CH3COOC2H3 15 0.4
20 0.49
Ethyl bromide C2H5Br 20 0.27
Ethylene bromide 20 0.787
Ethylene chloride 20 0.668
Ethylene glycol 21.1 17.8
Formic acid 10% 20 1.04
Formic acid 50% 20 1.2
Formic acid 80% 20 1.4
Formic acid concentrated 20 1.48
Trichlorofluoromethane, R-11 21.1 0.21
Dichlorodifluoromethane, R-12 21.1 0.27
FDichloro-fluoromethane, R-21 21.1 1.45
Furfurol 20 1.45
Fuel oil 1 21.1 2.39-4.28
37.8 -2.69
Fuel oil 2 21.1 3.0-7.4
37.8 2.11-4.28
Fuel oil 3 21.1 2.69-5.84
37.8 2.06-3.97
Fuel oil 5A 21.1 7.4-26.4
37.8 4.91-13.7
Fuel oil 5B 21.1 26.4-
37.8 13.6-67.1
Fuel oil 6 50 97.4-660
71.1 37.5-172
Gas oils 21.1 13.9
37.8 7.4
Gasoline a 15.6 0.88
37.8 0.71
Gasoline b 15.6 0.64
37.8
Gasoline c 15.6 0.46
37.8 0.4
Glycerine 100% 20.3 648
37.8 176
Glycerine 50% water 20 5.29
Glycol   52
Glucose 37.8 7.7M-22M
65.6 880-2420
Heptanes-n -17.8 0.928
37.8 0.511
Hexane-n -17.8 0.683
37.8 0.401
Honey 37.8 73.6
Hydrochloric acid   1.9
Ink, printers 37.8 550-2200
54.4 238-660
Insulating oil 21.1 24.1 max
37.8 11.75 max
Kerosene 20 2.71
Jet Fuel -34.4 7.9
Lard 37.8 62.1
54.4 34.3
Lard oil 37.8 41-47.5
54.4 23.4-27.1
Linseed oil 37.8 30.5
54.4 18.94
Mercury 21.1 0.118
37.8 0.11
Methyl acetate 20 0.44
Methyl iodide 20 0.213
54.4 18.2
Milk 20 1.13
Molasses A, first 37.8 281-5070
54.4 151-1760
Molasses B, second 37.8 1410-13200
54.4 660-3300
Molasses C, blackstrap 37.8 2630-5500
54.4 1320-16500
Naphthalene 80 0.9
Neatstool oil 37.8 49.7
54.4 27.5
Nitrobenzene 20 1.67
Nonane-n -17.8 1.728
37.8 0.807
Octane-n -17.8 1.266
37.8 0.645
Olive oil 37.8 43.2
54.4 24.1
Palms oil 37.8 47.8
54.4 26.4
Peanut oil 37.8 42
54.4 23.4
Pentane-n 17.8 0.508
26.7 0.342
Petrolatum 54.4 20.5
71.1 15
Petroleum ether 15.6 31(est)
Phenol, carbolic acid   11.7
20 1.13
Propylene glycol 21.1 52
Quenching oil   100-120
(typical)
Rapeseed oil 37.8 54.1
54.4 31
Rosin oil 37.8 324.7
54.4 129.9
Rosin (wood) 37.8 216-11M
93.3 108-4400
Sesame seed oil 37.8 39.6
54.4 23
Silicate of soda   79
Sodium chloride 5% 20 1.097
Sodium chloride 25% 15.6 2.4
Sodium hydroxide (caustic soda) 20% 18.3 4
Sodium hydroxide (caustic soda) 30% 18.3 10
Sodium hydroxide (caustic soda) 40% 18.3
Soya bean oil 37.8 35.4
54.4 19.64
Sperm oil 37.5 21-23
54.4 15.2
Sulphuric acid 100% 20 14.56
Sulphuric acid 95% 20 14.5
Sulphuric acid 60% 20 4.4
Sulphuric acid 20%

Tar, coke oven 21.1 600-1760
37.8 141-308
Tar, gashouse 21.1 3300-66M
37.8 440-4400
Tar, pine 37.8 559
55.6 108.2
Toluene 20 0.68
Triethylene glycol 21.1 40

Turpentine 37.8 86.5-95.2
54.4 39.9-44.3
Varnish, spar 20 313
37.8 143
Water, distilled 20 1.0038
Water, fresh 15.6 1.13
54.4 0.55
Water, sea   1.15
Whale oil 37.8 35-39.6
54.4 19.9-23.4
Xylene-o 20 0.93

Page last updated: 29/02/2020

Category: Freeware Tools