SYSE.11:5 - Worked Case: A Flood-Pump Station Ready for Emergency Discharge
A municipal flood-pump station is operating in configuration C18. Municipal engineers need a configuration that supports emergency discharge during the next flood-risk month. The bounded increment includes a replaced discharge manifold, a controller package, and a changed sensor mapping. A proposed bearing-temperature sensor is left outside the increment. C18 remains the fallback.
Before integration, the engineers check four inputs:
- a fabrication result shows that the supplier can make the positioning fixture and qualified weld for the selected material and geometry;
- the engineering platform is available in the configuration needed for controller integration and trial, based only on observations made before that Work;
- a temporary collector buffer is actually available under the municipality’s notice arrangement; and
- the configuration description identifies the station and the effectivity of C18.
The first fabrication result had left the fixture-and-weld branch unsupported. Engineers did not treat the plan as closed: they performed a feasibility investigation, obtained a fixture design and current capability evidence for the toolmaking and welding cells, and revised the realization arrangement. Fabrication still had to produce the actual fixture and manifold assembly; the descriptions and capability evidence were not those physical Systems.
| Work | Actual subject and result |
|---|---|
| Fabricate the fixture and weld the manifold assembly. | Produces the physical fixture, the mounted manifold assembly, and inspection evidence for their stated completion conditions. |
| Integrate the controller package. | Produces integration evidence for the named controller, software, inverter interface, and sensor-mapping editions. This Work overlaps fabrication. |
| Integrate station configuration C19. | Installs the manifold and controller package and changes the sensor relations of the continuing pump-station System. The Work is distinct from the station’s actual transformation from C18 to C19. |
| Run the emergency-discharge trial. | Produces observations of station C19, including discharge, controller behavior, buffer participation, and named failure conditions during the bounded trial. |
Under the station’s configuration reidentification rule, the same station continues through the change because its stable boundary, foundation, and pump train remain, while the manifold, controller, interfaces, and sensor mapping change.
The manifold material undergoes another transformation during positioning, welding, cooling, inspection, and rework. Shared time or subject does not make either Work occurrence identical to either transformation.
The trial supports use of C19 for the named emergency-discharge conditions and evidence window. It does not establish all-season reliability, every flood load, release authority, or the benefit of the proposed bearing sensor. If the temporary buffer relation were absent or stale, the trial and use claim would stop or narrow.
For the next modernization choice, the engineers compare keeping C19, adding the bearing sensor, collecting
another flood-load observation, and reverting to C18. The sensor option lacks qualified placement and maintenance
evidence, so its finite contribution relative to C19 is indeterminate rather than a scalar “sensor benefit.” A
C.11 decision selects another observed-load window before deciding on the sensor. That decision record does not
perform the future observation Work.
The bounded usability assessment cites C19, the Work and transformations, integration and trial evidence, buffer
participation, use limits, fallback, and reopen conditions. It can become evidence for SYSE.4, but it is not an
assurance conclusion, permission, release, or next modernization choice.
Countercase. A document bundle is approved while no actual configuration, integration Work, transformation, or use observation exists. The missing objects and relations should be named; the bundle should not be renamed an increment.