Cast iron
- Absolute ε lower
- 0.25908 mm
- Absolute ε upper
- 0.25908 mm
- Selected ε scenario
- 0.25908 mm
More dimensions
- ε/D lower
- 0.005
- ε/D upper
- 0.005
VALICALC · TECHNICAL REFERENCE
Pipe Roughness Chart
Look up scoped new-pipe Darcy roughness examples, compare relative roughness at your bore and transfer an explicitly selected value to Pump TDH.
ValiCalc · Pipe Roughness Chart
https://www.valicalc.com/pipe-roughness-chart
Dataset v1.2.0 · verified 2026-10-06
Display: metric. Inside diameter: 50 mm · Position within stated range: 0 %
SELECT YOUR CONDITIONS
Search within the verified subset. Numeric sizes match complete designations; a nearby size is a candidate, not an exact match.
SELECTED REFERENCE
Steel
- Absolute ε lower
- 0.04572 mm
- Absolute ε upper
- 0.04572 mm
- Selected ε scenario
- 0.04572 mm
All fields & cell provenance
- ε/D lower
- 9.144e-4
- ε/D upper
- 9.144e-4
- New pipe material: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06 · source value Steel.
- Absolute ε lower: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06 · source value 0.04572.
- Absolute ε upper: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06 · source value 0.04572.
- Selected ε scenario: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06.
- ε/D lower: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06.
- ε/D upper: EPANET hydraulic input coefficients — Table 3.2, new pipe; ε units ft×10^-3 converted to mm · verified 2026-10-06.
v1.2.0 · verified 2026-10-06 · values use the valid conditions shown above
Use this value
Review the selected values and units in the calculator before applying them.
Use selected roughness scenario →Use reviewed values in pipe pressure drop →Use reviewed values in friction factor →Steel0.04572 mmBack to answer ↑
Explore the verified data
5 matching rows · 5 in this subset
| New pipe material | Absolute ε lower | Absolute ε upper | Selected ε scenario | Actions |
|---|---|---|---|---|
| Cast iron | 0.25908 mm | 0.25908 mm | 0.25908 mm | |
| Concrete / lined concrete | 0.3048 mm | 3.048 mm | 0.3048 mm | |
| Galvanized iron | 0.1524 mm | 0.1524 mm | 0.1524 mm | |
| Plastic | 0.001524 mm | 0.001524 mm | 0.001524 mm | |
| Steel | 0.04572 mm | 0.04572 mm | 0.04572 mm |
Concrete / lined concrete
- Absolute ε lower
- 0.3048 mm
- Absolute ε upper
- 3.048 mm
- Selected ε scenario
- 0.3048 mm
More dimensions
- ε/D lower
- 0.006
- ε/D upper
- 0.061
Galvanized iron
- Absolute ε lower
- 0.1524 mm
- Absolute ε upper
- 0.1524 mm
- Selected ε scenario
- 0.1524 mm
More dimensions
- ε/D lower
- 0.003
- ε/D upper
- 0.003
Plastic
- Absolute ε lower
- 0.001524 mm
- Absolute ε upper
- 0.001524 mm
- Selected ε scenario
- 0.001524 mm
More dimensions
- ε/D lower
- 3.048e-5
- ε/D upper
- 3.048e-5
Steel
- Absolute ε lower
- 0.04572 mm
- Absolute ε upper
- 0.04572 mm
- Selected ε scenario
- 0.04572 mm
More dimensions
- ε/D lower
- 9.144e-4
- ε/D upper
- 9.144e-4
How to use this data
ε in source millifeet ×0.3048 gives mm. Relative roughness is ε/D with matching units. Select a position in the disclosed interval for a planning scenario; verify actual conditions.
CHECK THE METHOD
Worked example
EPA new steel ε=0.15 millifeet = 0.04572 mm. At D=50 mm, ε/D=0.0009144.
Related calculators
Continue the reference workflow
Common lookup questions
Can I use these values as a universal specification?
Roughness depends on surface, age and lining. The range-position scenario is your choice, not a measured installed value. Hazen-Williams C is a different parameter.
TRACEABLE DATA
Sources, scope & verification
Dataset v1.2.0
Last verified:
Five new-pipe material examples from EPA EPANET Table 3.2. Not an aged/corroded pipe database.
Values are curated product facts or generated scenarios. Paid standards, complete catalogs and source diagrams are not reproduced. A verification date applies to this documented subset.
EPANET hydraulic input coefficients ↗
Type B · US EPA · EPANET 2.2; EPA/600/R-20/133, 2020
Selected government-authored engineering facts; source conditions are retained.
Full provenance & artifact record
- Source checked
- 2026-10-06
- Use basis
- public-domain
- Artifact SHA-256
- No retained source artifact hash; see the stated source and verification record.