Plumbing Pipe Corrosion Rate Calculator

Audit actual matched wall-thickness changes per elapsed year, retaining apparent gains/measurement mismatch; not coupon mass-loss corrosion formula, remaining-life extrapolation or pressure integrity approval.

Description

Observed wall-thickness change divided by elapsed years measures a signed loss rate.

Observed wall-thickness change divided by elapsed years measures a signed loss rate. Apparent gains can reflect measurement mismatch.^[1]

The returned values include Signed observed wall loss mm year. The How section below explains the calculation, input rules and interpretation.

When to use Plumbing Pipe Corrosion Rate Calculator

Use Plumbing Pipe Corrosion Rate Calculator when you need to evaluate the supplied records under the calculation and evidence rules below. No coupon mass-loss conversion, remaining-life projection or pressure-integrity approval is supplied.

Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.

How to use Plumbing Pipe Corrosion Rate Calculator and understand its results

Prepare measured flows, pressures, temperatures or inventories with consistent units. For catalog tools, use independently verified capacities at the stated operating conditions and supply the explicit design demand.
Enter observedInitialWallMm, observedFinalWallMm, observedElapsedYears using the field table and calculation rules, then run the tool.
Read signedObservedWallLossMmYear. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
observedInitialWallMm	Observed initial wall mm	list of number	Required
observedFinalWallMm	Observed final wall mm	list of number	Required
observedElapsedYears	Observed elapsed years	list of number	Required

Enter aligned nonempty positive initial/final wall thicknesses and positive elapsed years. Return signed mm/year, retaining negative rates when final wall is thicker.

rate_i=(initialWall_i−finalWall_i)/elapsedYears_i

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
signedObservedWallLossMmYear	Signed observed wall loss mm year	list of number

json

{
  "input": {
    "observedInitialWallMm": [
      5,
      4
    ],
    "observedFinalWallMm": [
      4.8,
      4.5
    ],
    "observedElapsedYears": [
      2,
      1
    ]
  },
  "output": {
    "signedObservedWallLossMmYear": [
      0.10000000000000009,
      -0.5
    ]
  }
}

Limitations and assumptions

No coupon mass-loss conversion, remaining-life projection or pressure-integrity approval is supplied.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Plumbing Pipe Schedule Wall Thickness Calculator: Schedule dimensions must come from a verified catalog. Comparing observed minimum wall with the selected wall preserves wear evidence. For a complementary task, use Plumbing Corrosion Index Langelier Calculator: The Langelier index compares observed pH with matched saturation pH. The index alone does not determine material corrosion rate.

References

Plumbing Pipe Corrosion Rate Calculator — tool.io

Similar or alternative tools

Plumbing Pipe Schedule Wall Thickness Calculator
Schedule dimensions must come from a verified catalog. Comparing observed minimum wall with the selected wall preserves wear evidence.
Plumbing Corrosion Index Langelier Calculator
The Langelier index compares observed pH with matched saturation pH. The index alone does not determine material corrosion rate.