Library / First Principles Framework (FPF) - Core Conceptual Specification
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C.13:5.1 - Pump Skid: Integrated Assembly, Not A Parts List

PumpSkid #7 is assembled from exact Pump, Motor, Baseframe, Manifold, enclosure, pipe, cable, and connector entities. The direct mechanical, electrical, and fluid part-relation patterns identify the exact fastening, coupling, enclosure, terminal, flange, and seal occurrences. The skid assembly method or rule states how those facts form the candidate, and the skid reidentification rule says which replacements preserve PumpSkid #7.

The shorthand Γ_m.sum{Pump, Motor, Baseframe, Manifold, ...} is truthful only with those facts beside it. It records an integrated-assembly construction; it does not make the relations obtain. The composition sustains skid-level boundary, interface, load-envelope, and operating characteristics not attributable to one constituent alone.

The same parts unconnected on a pallet do not form the skid. A bill of materials and drawing are epistemes about intended or possible assembly. They do not substitute for actual part relations, assembly, or identity. The same part set connected under a different governed assembly may constitute another whole.