RFQ, Vendor Review and Commissioning
This series publishes working engineering analysis from K&K's data center program. Numbers are labeled [TARGET], [MODELED], [SENSITIVITY] or [FACT]; nothing here is field-measured data, and no article is a sealed engineering document. Each article states its own limits and open items.
- KK-DCL-085The CDU RFQ Freezes a Four-Tuple Rated Capacity It Never DefinesThe procurement package names a four-tuple rated capacity as a defining parameter twice and never says which four quantities it holds, while its own card for that equipment lists six.
- KK-DCL-086Rejected Nine-Unit UPS Is Excluded in Quantity Rows, Not Binding Bid TermsThe rejected nine-unit arrangement is excluded in two rows that state a quantity and not in the row a bidder treats as binding, so the exclusion travels only as far as those two rows are copied.
- KK-DCL-087FAT Items Marked Site-Invisible Cannot Wait for SATAny characteristic that cannot be observed after installation must be witnessed at the factory, not deferred to site acceptance.
- KK-DCL-088A Winter Power-Failure Test Is Not Summer Rejection EvidenceA power-failure test executed in winter conditions does not evidence summer heat-rejection capability, whatever the pass stamp says.
- KK-DCL-089Integrated System Test Scenarios Are Named Before the Plant Is FrozenNaming integrated system test scenarios early forces the design to state which failures it claims to survive, before equipment selection closes it.
- KK-DCL-090Fourteen Transformers Are in the Test Set; the Count Is Not FrozenThe delivered commissioning test set sizes its object scope with the transformer count of one unfrozen topology branch of three, and its own first case is the version-lock that branch has not had.
- KK-DCL-091Missing Criteria Needs Its Own Root-Cause Class, Not the Commissioning OneThe defect index gives criteria-missing a root-cause class of its own, separate from both design and commissioning, because its corrective action is to obtain the criterion rather than to repeat the test.
- KK-DCL-092Joint IST Needs Electrical and Cooling Release StampsA joint integrated system test cannot be released by one discipline, because the failure it tests belongs to neither alone.