Moody Friction Factor Reference

Darcy friction factors from the Moody chart for common pipe roughness values, plus a reference table of absolute roughness by pipe material.

Moody Chart Data

Moody Friction Factor Reference Table · Darcy friction factor (f_D) vs Reynolds number and relative roughness (ε/D) · Source: Moody, L.F., 'Friction Factors for Pipe Flow,' Trans. ASME, 66(8), 1944, pp. 671-684

Re \ ε/D	1e-05	5e-05	0.0001	0.0002	0.0005	0.001	0.002	0.005	0.01	0.02	0.05
4000	0.039917	0.039958	0.040008	0.04011	0.040412	0.04091	0.041891	0.044711	0.049082	0.056959	0.076987
6000	0.035515	0.035564	0.035624	0.035745	0.036105	0.036696	0.037847	0.041091	0.045964	0.054449	0.075243
10000	0.030898	0.03096	0.031037	0.03119	0.031644	0.032382	0.033794	0.03763	0.043127	0.052275	0.073801
20000	0.025905	0.025993	0.026101	0.026317	0.026947	0.027946	0.029788	0.03447	0.040705	0.050522	0.07269
40000	0.022002	0.022129	0.022286	0.022593	0.023469	0.024804	0.027132	0.032587	0.039363	0.049598	0.072124
60000	0.020106	0.020265	0.02046	0.020839	0.021896	0.023454	0.026063	0.031892	0.038891	0.049282	0.071934
100000	0.018044	0.018256	0.018514	0.019005	0.020327	0.022175	0.025107	0.031306	0.038504	0.049027	0.071781
200000	0.015719	0.016036	0.01641	0.017098	0.01882	0.021034	0.024309	0.030847	0.038206	0.048833	0.071666
500000	0.013303	0.013838	0.01443	0.015433	0.017663	0.020235	0.023789	0.030562	0.038026	0.048716	0.071597
1000000	0.01187	0.012649	0.013441	0.014683	0.017207	0.019943	0.023607	0.030465	0.037965	0.048677	0.071574
2000000	0.010721	0.01181	0.012803	0.01424	0.01696	0.019792	0.023514	0.030416	0.037934	0.048657	0.071562
5000000	0.009588	0.011135	0.01234	0.013944	0.016805	0.019698	0.023458	0.030387	0.037916	0.048645	0.071555
10000000	0.008996	0.01086	0.012166	0.013838	0.016753	0.019667	0.023439	0.030377	0.03791	0.048641	0.071553
50000000	0.008302	0.010611	0.012018	0.013752	0.01671	0.019642	0.023424	0.030369	0.037905	0.048638	0.071551
100000000	0.008188	0.010578	0.011999	0.013741	0.016704	0.019639	0.023422	0.030368	0.037904	0.048638	0.071551

Pipe Roughness

Common Pipe Absolute Roughness Values · Source: Crane TP-410, Cameron Hydraulic Data, Perry's 9th Ed

Pipe Material	ε (ft)	ε (in)	Notes
Commercial Steel / Welded Steel	0.00015	0.0018	Most common in refinery piping
Stainless Steel (new)	5e-06	6e-05	Polished SS tubing even lower
Cast Iron (new)	0.00085	0.0102	Unlined
Cast Iron (corroded)	0.003	0.036	After years of service
Galvanized Steel	0.0005	0.006
Concrete (smooth)	0.001	0.012	Steel forms, smooth finish
Concrete (rough)	0.01	0.12	Rough finish
Drawn Tubing (brass, copper, glass)	5e-06	6e-05	Very smooth
PVC / Plastic Pipe	5e-06	6e-05	Essentially smooth
Riveted Steel	0.006	0.072	Historical — rarely used now
Fiberglass (FRP)	1.6e-05	0.00019
Lined Pipe (epoxy/rubber)	5e-06	6e-05	Depends on lining condition
Corrugated Metal	0.015	0.18	Drainage applications

Source: Moody_Friction_Factor_Reference_v1.xlsx

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