Plumbing Fire Sprinkler K Factor Flow Calculator
Actual sprinkler QUS gpm=K√Ppsi, listed matchedKandresidual—not static—pressure, not full network demand/fire design. Actual independently matched units, regime, material/equipment and governing references; not a hydraulic code, safe pressure, water pot ability or operational approval.
Description
A sprinkler's listed K factor relates residual pressure to discharge flow.
A sprinkler's listed K factor relates residual pressure to discharge flow.1
Residual pressure at the sprinkler differs from an unrelated static supply pressure. The calculation and input requirements are explained below.
When to use Plumbing Fire Sprinkler K Factor Flow Calculator
Enter positive verified sprinkler K in US gpm/sqrt(psi) and nonnegative residual pressure psi.
How to use Plumbing Fire Sprinkler K Factor Flow Calculator and how it works
- Prepare the measurements or independently established model inputs described below, with matching units and observation scope.
- Enter the required fields and run Plumbing Fire Sprinkler K Factor Flow Calculator.
- Read the result fields using the formula, output units, signs and ordering explained below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerVerifiedSprinklerKUsGpmPerSqrtPsi | Caller Verified Sprinkler K Us Gpm Per Sqrt Psi. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
| actualSprinklerResidualPressurePsi | Actual Sprinkler Residual Pressure Psi. Use the units and matching context stated in the calculation below. | number | Required; nonnegative; finite; other constraints below |
Enter positive verified sprinkler K in US gpm/sqrt(psi) and nonnegative residual pressure psi. Multiply K by sqrt(P) to return US gpm. Listing, pressure availability and network demand remain independently established.
dischargeUSgpm=K*sqrt(residualPsi) Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Numeric result under the formula and output units explained above. | number |
{
"input": {
"callerVerifiedSprinklerKUsGpmPerSqrtPsi": 10,
"actualSprinklerResidualPressurePsi": 4
},
"output": {
"result": {
"value": 20
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Plumbing Fire Sprinkler Pressure From Flow Calculator for a complementary operation: A sprinkler K factor relates residual pressure to discharge.
Use Plumbing Fire Sprinkler Hydraulic Demand Calculator for a complementary operation: Sprinkler hydraulic demand includes simultaneously operating discharges and applicable hose allowance.
References
Similar or alternative tools
- Plumbing Fire Sprinkler Pressure From Flow Calculator
A sprinkler K factor relates residual pressure to discharge.
- Plumbing Fire Sprinkler Hydraulic Demand Calculator
Sprinkler hydraulic demand includes simultaneously operating discharges and applicable hose allowance.