Pipe Roughness Relative Diameter Factor Tool

Description

Return relative pipe roughness and its supplied uncertainty.

Physical process calculations combine supplied geometry, material properties and pressure or gas-state conventions. A density scaling, ideal-gas correction or vessel-volume term can be dimensionally consistent without verifying the actual fluid state, flow regime or equipment suitability.

Return relative pipe roughness and its supplied uncertainty.

When to use this tool

Use Pipe Roughness Relative Diameter Factor when evaluating the stated geometric, fluid-property or gas-state term.

How to use the tool and how it works

Enter absoluteRoughness, diameter, roughnessUncertainty. Use the units and conventions below.
Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
Read relativeRoughness, relativeUncertainty. Use the output convention below.

Return relative pipe roughness and its supplied uncertainty. Require nonnegative absoluteRoughness/roughnessUncertainty and diameter > 0; divide each by diameter.^[1]

Input field	Meaning and units	Accepted input
absoluteRoughness	Absolute Roughness	Required. Finite number; minimum 0.
diameter	Diameter	Required. Finite number; strictly above 0.
roughnessUncertainty	Roughness Uncertainty	Required. Finite number; minimum 0.

Output field	Interpretation	Returned shape
relativeRoughness	Relative Roughness	Required. Finite number.
relativeUncertainty	Relative Uncertainty	Required. Finite number.

json

{
  "input": {
    "absoluteRoughness": 0.1,
    "diameter": 100,
    "roughnessUncertainty": 0.02
  },
  "output": {
    "relativeRoughness": 0.001,
    "relativeUncertainty": 0.0002
  }
}

Limitations and assumptions

All lengths share units; this does not determine friction factor, flow regime or a statistical uncertainty distribution.
Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.

Alternative or Complementary methods

Use verified geometry and state-specific material data with an appropriate full engineering model for actual flow, storage or equipment design.

References

Calculation and input contract: chemical-engineering/pipe-roughness-relative-diameter-factor — tool.io

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