Appendix F pump-failure test budget for a four-rack teaching zone
5.0 s response budget < 6.0 s assumed limit; hardware acceptance stays openmodeled
| Value kind | modeled — Interpret this value according to its displayed kind, scope, source, and as-of date. |
|---|---|
| Scope | Teaching inputs: four racks at 100 kW liquid heat each; sensing 0.50 s, logic 0.50 s, standby recovery 3.0 s, margin 1.0 s, assumed limit 6.0 s. HPE's separate 115 kW liquid duty sets the load scale. Uptime classes single-phase cold-plate pump failure as seconds-scale, not an OEM six-second limit; the real limit comes from the rack's transient data (Chapter 5.11). |
| As of | 2026-09-08 |
| Source | Guide derivation — stated assumptions and arithmetic, September 8, 2026; Uptime Intelligence Report 117M (November 2023), p. 10, Table 3 scenario 2, bounds the illustrative time scale; Chapters 5.11 and 13.6 require product qualification. · Chapter 5.11, loss-of-flow response and qualified protection boundary; Appendix F, F-R02.1/.2 teaching calculation and assumed response budget. |
| Derivation | 4 × 100 = 400 kW. Response = 0.50 + 0.50 + 3.0 = 4.0 s, plus 1.0 s margin = 5.0 s, below the assumed 6.0 s limit. At 4.0 s recovery the total is 6.0 s, equal to the limit, which fails the before-limit criterion. The rack's allowable interruption must exceed the measured total plus its uncertainty (Chapter 5.11); hardware acceptance stays open until that limit and an independent control and power path are tested. |
| Review | checking…cadence-derived review 2027-01-06 · standard cadence |
| Recorded changes | last 2026-10-19 |
| Claim id | guide2-t214-f-pump-protection-test |
Where the guide uses it
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