Pump Hydraulic Power Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-251

Effect

Computation or source lookup only

Input and validation requirements

An efficiency input of η = 0 causes an undefined shaft-power result, and η = 1.2 is physically invalid despite producing a raw numeric result. Negative flow also produces opposite-signed power unless the convention is explicitly defined.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "Q_m3_s": 0.02,
    "H_m": 30,
    "rho_kg_m3": 998,
    "eta": 0.8
  },
  "expected_outputs": {
    "hydraulic_power_W": 5874.228,
    "shaft_power_W": 7342.785
  },
  "working": "Phyd=ρgQH=998×9.81×0.020×30. First, 9.81×0.020=0.1962. Then 0.1962×30=5.886. Then 5.886×998=5874.228 W. Pshaft=5874.228÷0.80=7342.785 W."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json