04 – Backlog: missing data, errors and open decisions¶
Source: OCP Design Specification Universal Quick Disconnect (UQD) v2.0.0 (effective 2026-09-22). Related: 02-Parameters.md · 03-Tests.md · 07-Symbols.md
ID system¶
| Prefix | Category | Meaning |
|---|---|---|
| MD-xxx | Missing data | A value, method or criterion is missing in the specification |
| ER-xxx | Error | Factual error, contradiction, calculation error or wrong cross-reference in the specification |
| ED-xxx | Editorial | Spelling, numbering or label; does not affect test results |
| BS-xxx | Decision | Internal decision required before test start |
| DOC-xxx | Own documents | Correction in our own files (01–07) |
Priority: H = blocks test or acceptance · M = affects interpretation or report · L = cosmetic Status: Open / In progress / Closed
Summary¶
| Category | Count | Of which H |
|---|---|---|
| MD – Missing data | 32 | 5 |
| ER – Errors | 14 | 2 |
| ED – Editorial | 14 | 0 |
| BS – Decisions | 9 | 5 |
| DOC – Own documents | 6 | 0 |
MD – Missing data¶
| ID | Ref | Description | Affects | Prio | Proposal / action | Status |
|---|---|---|---|---|---|---|
| MD-001 | §9.1.1 | "Minimum proof pressure" is used to set the max test pressure for burst ("3× min proof pressure") but is not defined anywhere. | 9.1.1 | H | Probably 3 × max operating pressure = 300 psi (= min burst), which would make the test a "pass at 300 psi" test rather than a test to failure. Confirm with OCP or customer. | Open |
| MD-002 | Table 6, §9.1.4 | Min/max for the pressure drop coefficients A and B are missing ("planned review"). | 9.1.4 | M | Report A, B without acceptance. Accept on Cv only. | Open |
| MD-003 | Table 6 note 2 | Max coupling force applies to UQDB only. For handmate UQD no limit exists, even though 9.1.3 is to be run. | 9.1.3 | H | Define an internal limit for UQD, or report without acceptance (N/A). | Open |
| MD-004 | §9.1.3 | Disconnect force is to be "minimized" but has neither test method nor limit. | 9.1.3 | L | Preferably measure in the same cycle and report as information. | Open |
| MD-005 | §9.1.2 | The number of couplings per sample in fluid loss is not stated. The specification refers only to ISO 18869 §12. | 9.1.2 | M | Take the number of cycles and measurement method from ISO 18869 §12. Document in the protocol. | Open |
| MD-006 | §9.1.4 | SG (specific gravity) in the Cv formula is not stated for the test medium. | 9.1.4 | L | Use SG for water at the measured temperature (≈ 0.997 at 25 °C) or 1.0. State the choice in the report. | Open |
| MD-007 | §9.1.4, Table 6 | Max Cv is in Table 6, but the test description only requires min Cv to be reported. It is not clear how Max Cv is to be verified. | 9.1.4 | M | Evaluate Cv at rated flow against both min and max. | Open |
| MD-008 | §9.2.1, §9.2.2 | The number of temperature cycles is not stated. The specification describes a sequence (cold 72 h → hot 72 h → RT) but not whether it is repeated. | 9.2.1, 9.2.2 | H | Interpret as 1 cycle unless confirmed otherwise. | Open |
| MD-009 | §9.1.5, §9.2.1, §9.2.2 | Temperature tolerances are missing (60 °C, −40/+70 °C, +5/+65 °C). Only 9.1.4 has a tolerance (25 ± 5 °C). | 9.1.5, 9.2.x | M | Set an internal tolerance, e.g. ± 2 °C for chamber and ± 3 °C for fluid. | Open |
| MD-010 | §9 | Helium leak test: leak rate limit (mbar·L/s) and method (sniff/vacuum) are missing. The test is optional but has no acceptance criterion. | B1, B3 | M | Define an internal limit, or use the helium test for screening only. | Open |
| MD-011 | §9.2.3 | Mechanical cycling at 2.75 bar(g): it is not clear whether the pressure is to be on both halves, whether it is static or under flow, or how it is to be reset between cycles. | 9.2.3 | H | Interpret as static pressure on both sides, by analogy with 9.1.3. Confirm. | Open |
| MD-012 | §9.2.3 | No requirements on fluid loss or force during or after 5000 cycles. Only a hydrostatic test afterwards. | 9.2.3 | L | Preferably measure force and fluid loss after 5000 cycles as information. | Open |
| MD-013 | §9.2.2 | "Nominal engagement" is not defined for handmate UQD. For UQDB/Hybrid it is interpreted as nominal mated length. | 9.2.2 | M | UQD: fully latched. UQDB/Hybrid: nominal length per Figure 4. | Open |
| MD-014 | §9.1.3, §9.2.3, Table 4 | "Max radial misalignment (SA)": unclear whether it means 1.00 mm (nominal) or 1.30 mm (upper tolerance +0.30). | 9.1.3, 9.2.3 | H | Test at 1.30 mm (worst case), or confirm 1.00 mm. | Open |
| MD-015 | §9.1.4 tare table | Tare adapters are given only for stud-to-stud ("UQDB/UQDH"). For UQD socket with hosebarb, the tare geometry is missing. | 9.1.4 UQD | M | Use the hosebarb adapters in the specification's example. Prepare an own tare with the same hose length and the same hose clamps. | Open |
| MD-016 | §6.2.2, Table 1 | Mated length for handmate UQD is not tabulated, since it depends on the latch mechanism. | Fixtures | L | Measure and document own values. | Open |
| MD-017 | §7.5 | Hosebarb geometry (UQD socket) is left to the supplier. Hose type, ID tolerance and clamping for test are not stated. | 9.1.4, 9.1.5, 9.2.x | M | Fix a standard hose (reinforced EPDM) and clamping method for all tests. | Open |
| MD-018 | Table 6 | Storage life of 5 years and service life of 10 years have no verification method (ageing, ozone, compression set). | – | L | Refer to material data or accelerated ageing. Outside the test plan. | Open |
| MD-019 | §9.1.3 | Test medium "air or water". The choice affects the force, but it is not stated which one is to be used or reported. | 9.1.3 | M | Choose one medium for all sizes and state it in the report. | Open |
| MD-020 | §15.3 | The report templates have no fields for 9.2.4 (hydrostatic test) or for the helium test. | Report | M | Add own rows to the report template. | Open |
| MD-021 | §9.1.4 tare table | It is not clear what "Diameter D" refers to. The value is larger than the hose ID (e.g. 9.88 mm for size 02 with 6.35 mm hose), so it is probably the outside diameter, not the bore. | 9.1.4 tare | L | Interpret as outside diameter. The tare adapter bore should be equal to or larger than the hose ID. | Open |
| MD-022 | §9.1.5 | Dwell times per cycle are missing: how long the coupling is to stay mated and unmated between connects and disconnects. | 9.1.5 | M | Mated until flow is stable at 2× rated (≥ 5 s); unmated until pressure at C is stable (≥ 5 s). | Open |
| MD-023 | §9.1.5 | Hose ID for the circuit is not stated (L < 5·ID presupposes it), nor whether UQDB is to be run with SA offset or which half is to move. | 9.1.5 | M | Same hose ID as 9.1.4. UQDB coaxial at hard-stop. Plug moving, socket fixed. | Open |
| MD-024 | §9.1.5 | It is not clear whether the "pressure spike ≤ 30 psi" limit is a requirement on the set-up or an acceptance criterion for the coupling. Measurement method and sampling frequency for the spike are also missing. | 9.1.5 | M | A cycle with a spike > 30 psi counts as invalid and is rerun after adjustment. Pressure transducer ≥ 1 kHz. | Open |
| MD-025 | §9.1.5 | "Leakage" and "seal washout" are not defined, and no method is given for checking the seals after the test. The boundary against normal fluid loss at disconnect (9.1.2) is unclear. | 9.1.5 | M | Definition per 06-Seal_Washout §8.1. Visual inspection and photo of seals before and after. | Open |
| MD-026 | §7, Figures 7–10 | No drawing standard is stated (ASME Y14.5 or ISO GPS). The symbols Ⓔ (envelope), TSC and the .000 datum, general tolerances for untoleranced dimensions and the projection method are not defined. | Dimension inspection, conformity statement | M | Interpret per ASME Y14.5 (inch/US origin of the drawings). Confirm with OCP. See 07-Symbols §1. | Open |
| MD-027 | NOTE 2 (Tables 1–4) | "32Ra MAX" has no unit. 32 µin (0.8 µm) is likely; 32 µm would be unreasonably rough for a sealing surface. | Surface inspection of sealing surfaces | M | Inspect against Ra ≤ 0.8 µm (32 µin). Confirm. | Open |
| MD-028 | §9.1.5, Figure 14 | Pressure gauge D (downstream of the QD) is in the figure but is not mentioned in the test process. It is not clear which transducer (C or D) is to measure the pressure spike at disconnect. | 9.1.5 | M | Log both C and D at ≥ 1 kHz. Assess the spike on the pressurized side. See MD-024. | Open |
| MD-029 | §6.2.1, Figure 5 | "Approach angle" for blindmate has no max value. The specification only says the angle is to be minimized. | UQDB fixtures | L | Run the tests coaxially. State any internal limit in the fixture drawing. | Open |
| MD-030 | Table 6 note 5 | The term "L10" is used without definition (low-temperature exposure with fluid). | 9.2.1 | L | Ask OCP what L10 refers to. Does not affect the test as long as 9.2.1 is run with air. | Open |
| MD-031 | Figure 8 | "2XØG" indicates two features with diameter G, but it is not stated which two surfaces are meant (flange and/or shoulder). G bounds the latch space (§7.1.1). | Dimension inspection, latch compatibility | L | Interpret as the locking flange and the shoulder at Q. Confirm with OCP. | Open |
| MD-032 | §9.1.5, Figure 14 | The specification gives no engagement length for the pair in the actuator and does not say which half is moved. Valve stroke S is REF only (ER-013) and the handmate plug position depends on the latch (MD-013). The actuator stroke (proposal: engagement length + 10 mm) and the time per connect/disconnect cannot be calculated. | 9.1.5 fixture and actuator | M | Measure the engagement length on the sample and set the stroke from that. In the interactive page the right-hand half moves; this is a drawing choice, not a requirement. | Open |
ER – Errors / contradictions¶
| ID | Ref | Description | Affects | Prio | Proposal / action | Status |
|---|---|---|---|---|---|---|
| ER-001 | Table 6 | The force/pressure scaling factors do not agree between N/bar and lbf/psi for 04, 06 and 08 (about 10 % deviation). Recalculated: 9.62 N/bar = 0.149 lbf/psi (spec 0.164), 16.06 N/bar = 0.249 lbf/psi (spec 0.274) and 24.00 N/bar = 0.372 lbf/psi (spec 0.409). Only 02 agrees (3.47 N/bar = 0.054). | 9.1.3 acceptance | H | The limit at 6.89 bar differs by up to 15 N, e.g. UQDB08 300.4 N (N/bar) versus 315.4 N (lbf/psi). Use N/bar (conservatively lower) for now and report to OCP. | Open |
| ER-002 | §9.1.1 vs §15.3.3 | The text says burst mated applies to UQD only, but the test template has a "Mated" row for all. | 9.1.1 | M | Follow the text: no mated burst for UQDB. Write N/A in the template. | Open |
| ER-003 | §9 vs §10 | Both sections refer to ISO 18869 for sample size, but state 5 and 3 respectively. | Sample size | L | Keep 5 for verification and 3 for cross-verification per the respective section. | Open |
| ER-004 | §15.3.3 9.1.4 | Pressure drop is stated in "psi(g)" (gauge pressure). Differential pressure should be stated in psi (psid). | 9.1.4 report | L | Report in psid. | Open |
| ER-005 | §15.3.3 9.1.4 vs §9.1.4 | The template states flow in GPM, but the curve fit (A, B) is to be done in L/min and Cv with GPM. Mixed units in the same table. | 9.1.4 | M | Log in L/min and convert to GPM for Cv. State both in the report. | Open |
| ER-006 | §9.2.3 vs §9.1.3 | The test pressure 40 psi is given as 2.75 bar(g) in 9.2.3 but as 2.76 bar(g) in 9.1.3 (40 psi = 2.758 bar). | 9.2.3 | L | Use 2.76 bar(g). | Open |
| ER-007 | §7.4 | The text says "Physical features of the UQDB socket…" but the section and Figure 10 refer to the UQDB plug. | Dimensions | M | Read as UQDB plug. | Open |
| ER-008 | §6.2.1, Figure 4 | The hybrid tolerances are asymmetric for 04 (−0.5/+0.4), 06 (−0.5/+0.4) and 08 (−0.5/+0.4), while 02 is ±0.45 and all UQDB are ±0.5. Possibly a rounding error. | Fixture, 9.2.2 | L | Verify against the tolerance chain. Use the table values. | Open |
| ER-009 | Table 1, Table 3 | Dimension C for 06/08 is given as an interval [MIN, MAX], but the tolerance column says ±0.025. | Dimensions | L | The interval applies to 06/08 and ±0.025 to 02/04. | Open |
| ER-010 | §15.3.1 | The verification report checklist lacks 9.2.4 even though the test is included twice in the sequence (Figure 12). | Report | M | See MD-020. | Open |
| ER-011 | §15.3.3 9.2.3 | The template for mechanical cycling has the rows "Plug/Socket", but the test is performed on pairs. The hydrostatic test afterwards can be done both unmated and mated. | 9.2.3 report | H | Define what P/F per row means: plug and socket respectively unmated in 9.2.4 after cycling, plus an added mated row. | Open |
| ER-012 | §3 | The version table states release June 2026, but the document is effective 2026-09-22. | Traceability | L | Refer to "v2.0.0, effective 2026-09-22". | Open |
| ER-013 | Table 1, §7.1, §15.1 | Dimension S is labelled both "Smax" and "REF" in Table 1, while §15.1 calls it a max dimension and Tables 2–4 show (S) without a value. It is unclear whether S is a controlled limit or reference only. | Dimension inspection, coupling to full position | L | Treat S as reference, but measure stroke at the pre-check as information. | Open |
| ER-014 | §9.1.5 Test Setup step 5 vs Test Process steps 1–2 | Test Setup step 5 stops the circulator before the QD is reconnected (step 6). Test Process step 1 then assumes the circulator is already on, and step 2 says to "turn circulator on" again. It is not stated when the pump is restarted, or whether the first connect after setup is made with the pump off. | 9.1.5 | L | Restart the pump at T1 with the QD mated, then check flow. Count only connects/disconnects made with the pump running as test cycles. | Open |
ED – Editorial¶
| ID | Ref | Description | Prio | Status |
|---|---|---|---|---|
| ED-001 | Table 3, Table 4 | The row labels say "UQD02 … UQD08" but should be "UQDB02 … UQDB08". | L | Open |
| ED-002 | §15.3.3 | "Subtest 9.2.1 – Operational Temperature Cycling" should be 9.2.2. | L | Open |
| ED-003 | §6, Figures 1–3 | The figure order is reversed: Figure 2 (UQD) comes before Figure 1 (UQDB). | L | Open |
| ED-004 | §9.1.4 tare table | The term "UQDH" is used but not defined in §4 (probably means UQD handmate). | L | Open |
| ED-005 | Table 1 | The note numbering skips NOTE 3 (1, 2, 4). | L | Open |
| ED-006 | Table 2 | JJ for UQD08 is written as "10◦" instead of "10°". | L | Open |
| ED-007 | §15.2.1, Figure 16 | Zone 4 and zones 4a/4b are given different acceptance (Table 10: 4a/4b ≤ 0.3 mm², 4 ≤ 1.0 mm²). The boundary between 4 and 4a/4b is unclear. | L | Open |
| ED-008 | §9.1.4 Figure 13 | The figure shows a section labelled "L6" that is missing from the key (L1–L5). | L | Open |
| ED-009 | Table 6 | The units of the scaling factor are written "N(bar)" and "lbf(psi)" instead of N/bar and lbf/psi. The parenthesis form clashes with the convention bar(g)/psi(g). | L | Open |
| ED-010 | Figure 14 | The abbreviations WHA, PSIG and LPM are not defined in §4. | L | Open |
| ED-011 | Table 3, Table 4 | NOTE 7 means different things in Table 3 (non-standard zone) and Table 4 (self-alignment). | L | Open |
| ED-012 | §9.1.4 Figure 13 | The figure shows pressure gauge and flow meter symbols that are missing from the key (1–4). | L | Open |
| ED-013 | §14 | Standards cited in the text are missing from the reference list: ASTM E493, SAE J1926-1/-3, TAPPI/ANSI T 564, UL94. | L | Open |
| ED-014 | §15.3.3 9.1.5 | The template refers to "Subtest 9.1.5.1 – Operational Test", but §9.1.5 has no subsection 9.1.5.1. | L | Open |
BS – Decisions required before test start¶
| ID | Decision | Linked to | Prio | Alternatives | Status |
|---|---|---|---|---|---|
| BS-001 | Max test pressure for burst | MD-001 | H | (a) 300 psi pass/fail · (b) to failure · (c) 900 psi cap | Open |
| BS-002 | Should hybrid (UQD plug + UQDB socket) be included in the verification? | 03-Tests §6 | H | Yes / No | Open |
| BS-003 | May non-destructive 9.1 tests share samples? | 03-Tests §5 | M | Yes (−10 pairs/product) / No | Open |
| BS-004 | Test medium for 9.1.5 and 9.2.2–9.2.4 | – | M | Water / PG25 | Open |
| BS-005 | 9.2 population: two separate populations or one in series | 03-Tests §9 | M | Two populations / One population | Open |
| BS-006 | Partners for cross-verification (at least 3) | §10 | H | Candidates from the specification's contributor list: Cejn, CPC, Danfoss, Staubli, Parker etc. | Open |
| BS-007 | SA offset in test: 1.00 or 1.30 mm | MD-014 | H | 1.00 / 1.30 | Open |
| BS-008 | Which scaling factor applies for acceptance in 9.1.3? | ER-001 | H | N/bar (lower limit) / lbf/psi | Open |
| BS-009 | Where test results are archived. The test logger (docs/app) stores data only in the browser on one device. Decide where the exported CSV/JSON is kept (repository, shared drive) and who is responsible, so that raw data is traceable for the verification report. | §15.3 | M | Commit CSV to a results/ folder in the repo · Shared drive · Add a shared database later |
Open |
DOC – Own documents¶
| ID | File | Description | Status |
|---|---|---|---|
| DOC-001 | 02-Parameters.md §9 | The statement that rated flow in L/min and GPM are "rounded differently" was wrong. The values are consistent (0.6 GPM = 2.27 L/min etc.). The item is replaced with a reference to ER-001. | Closed |
| DOC-002 | 01–06, project instruction | (1) Project instruction requires all documentation in English, but 01–06 were written in Swedish. Resolved 2026-10-15: 01–06 translated to English; 07 was already in English. (2) The project instruction refers to "03-Backlog.md", but the backlog is 04-Backlog.md (03 is 03-Tests.md). Resolved 2026-10-15: the file name 04-Backlog.md is kept, since all files cross-reference it; the project instruction in claude.ai should be changed to read "04-Backlog.md". | Closed |
| DOC-003 | README.md, 01-Overview.md | README.md was empty and the repository structure did not describe the website. Resolved 2026-10-15: README.md written; website (mkdocs.yml, docs/, scripts/, .github/workflows/) added to the structure table in 01-Overview. | Closed |
| DOC-004 | docs/app, tests/ | Interactive test logger for 9.1.5 added (client-side only). Its logic follows 06-Seal_Washout_9.1.5 including the internal proposals (flow below 2× rated and spike > 30 psi make a cycle invalid, not failed; leak or washout on any cycle fails the run). Resolved 2026-10-15: documented in README and 01-Overview. If 06 changes, update docs/app/logic.js and tests/logic.test.cjs. | Closed |
| DOC-005 | docs/guides/symbols.md, docs/assets/seal-washout-rig.svg | Graphical symbols page added (16 test-circuit symbols, 19 drawing symbols, note flags, pressure-drop circuit). Meanings follow 07-Symbols; the pictures are our own redrawing. The pressure gauges in the seal washout rig drawing were changed from pointer gauges to circle-with-cross to match Figure 14. Resolved 2026-10-15. If 07-Symbols changes, update the page. | Closed |
| DOC-006 | docs/explorer.md, docs/assets/explorer*.js/css, docs/logger.md, mkdocs.yml, docs/app/logic.js, 06, guide | (1) Interactive 9.1.5 page added: type/size/flow-direction selector, rig drawing with all values and lengths, pair close-up, and animations of the set-up (P1–P3, S1–S6) and the test (T1–T5). Values come from 02/06 via docs/app/logic.js and docs/assets/explorer-data.js and are checked against 02-Parameters in tests/explorer.test.cjs. (2) Main menu changed to top tabs so the interactive page, test logger and symbols are one click away. (3) Correction: the max distance WHA ↔ QD had been rounded to whole mm and for size 02 was above the limit (32 mm vs 5 × 6.35 = 31.75 mm). Now rounded down to 0.1 mm: 31.7 / 47.6 / 63.5 / 79.3 mm in 06, the guide, logic.js and the logger. Resolved 2026-10-15. | Closed |