Source: https://guthlabs.ai/docs/instruments/pump-hydraulic-power-calculator/implementation/

instrument implementation / implementation-contract

# Pump Hydraulic Power Calculator implementation

A source-bound implementation contract for Pump Hydraulic Power Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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

[01**Overview**](<https://guthlabs.ai/docs/instruments/pump-hydraulic-power-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/pump-hydraulic-power-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/pump-hydraulic-power-calculator/qualification/>)

## 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`