Progress
A running snapshot of where the build is. Update this file as things move.
Status at a glance
| Subsystem | Status | Notes |
|---|---|---|
| System spec (RO-SPEC-001) | Rev I — published | Procurement-anchored to BOM Rev H — detail below |
| Tank sourcing (T-101, T-102) | Spec published | Looking at modified Sanke kegs as primary path |
| Metering pumps | Spec published | Three identical diaphragm pumps (Grundfos DDC 6-10 on BOM) |
| Bill of materials | Rev H — current | See BOM |
| PLC / controls | Parts being acquired (Phase 1) | P2-550, P2-11B base, I/O modules on BOM |
| VFDs | Phase 2 — partly on BOM | GS21 series + line reactors ordered |
| Sensors / instruments | Phase 3 | CT/PT/flow on BOM; some TBD |
| Output devices | Phase 4 | Valves, UV, metering pumps on BOM |
| HMI | Phase 5 | CM5-T10W on BOM (backordered at last update) |
| Physical assembly | Phase 6 | Tanks, panel, static mixer, etc. |
| Permitting (San Diego DEH) | Pre-submittal | See regulatory |
RO-SPEC-001 Rev I (April 2026)
Rev I re-anchors the spec to BOM Rev H — additional procurement around the UV unit, sediment/carbon filter cartridges, and SS filter housings. The most material change is the UV step-up; filters and housings procured as already specified.
| Area | Change |
|---|---|
| UV | Larger lamp/reactor in the same controller family — Pulsar PUV-200-20 (20 GPM-class) replaces the previously-specified PUV-200-10-BGF (10 GPM-class). Same controller, same install footprint intent, but ≈ 3.5× the rated throughput at every dose point: 39 GPM @ 16 mJ/cm², 21 GPM @ 30 mJ/cm², 16 GPM @ 40 mJ/cm² (all 95 % UVT). At the 4 GPM recirc design flow, delivered dose climbs from ≈ 44 / 31 mJ/cm² (fresh / EOL) on the -10 to ≈ 158 / 111 mJ/cm² on the -20 — ≈ 7× the USEPA 16 mJ/cm² potability minimum even at end-of-lamp-life, and comfortably above the NSF/ANSI 55 Class A reference dose of 40 mJ/cm² throughout lamp life. The unit itself remains uncertified (Class A is a unit-level type-test, not a dose threshold) — plan-check submittal pathway under SD DEH MFF §IV.C unchanged. Full recalculation in system overview §3.5. Skid-layout impact: reactor diameter steps up from 2.5″ on the -10 to 3.5″ on the -20 (length essentially unchanged at ~36″) and inlet/outlet steps up from ¾″ MNPT to 1″ MNPT — confirm clamps, brackets, and fittings on the recirc loop accordingly. All -20-specific spec values (lamp 42 W / system 51 W, replacement P/Ns 406-PUV-LM-20 / 406-PUV-QS-20, dimensions, port size) sourced from the Pulsar manual p. 22 spec table, now archived at /regulatory/vendor/Pulsar-UV-Manual.pdf. |
| Pre-filtration | Sediment cartridge (550-USWPF-4520-05), carbon block (507-USWCB-4520-10), and SS housings (645-PWSSH-120 × 2) procured as already specified — no design change. Confirms the Rev H spec. |
RO-SPEC-001 Rev H (April 2026)
Rev H replaces generic “or equal” component language with the specific make / model / part numbers actually being purchased, aligned with BOM Rev G. The technical spec lives in System overview; this section is the human-readable revision log.
| Area | Change |
|---|---|
| HMI | C-more EA9-T10WCL → CM5-T10W (newer CM5 series). Software: CM5 Series Software v8.0 (not EA9 Designer). |
| PLC base | P2-08B (8-slot) → P2-11B (11-slot) — P2-08B was not available on the used market when procurement ran; electrically the same for populated modules, with more expansion slots. |
| UV | Specified as US Water Systems Pulsar PUV-200-BGF (30 mJ/cm² at 95% UVT at rated flow; recirc at ~4 GPM delivers large margin — see §3.5 in the system spec). |
| Pre-filtration | US Water Systems stack: 550-USWPF-4520-05 (5 µm pleated sediment) + 507-USWCB-4520-10 (carbon block), both 4.5″×20″, in 645-PWSSH-120 304 SS housings. |
| RO membrane vessel | US Water Systems 257-208238 (2540 SS pressure vessel). |
| Conductivity | Hanna HI7635 (CT-101); Levtech HMCCS (CT-102, CT-103). |
| 24 VDC field power | Mean Well NDR-120-24. |
| Post-injection mixing | Koflo 105955Q34R static mixer on the line into T-102. |
| Electrical | AutomationDirect LR2 line reactors (input side of VFDs); Southwire VFDC-16-4B-1 shielded VFD cable to motors (§6). |
| Metering pumps | Grundfos DDC 6-10 AR-PVC/V/C-F-31I001FG (Product No 98586903, × 3) procured. NSF/ANSI 61 is model-level approved per Grundfos catalog (CE · CSA-US · NSF 61 · EAC · RCM); the procured EU-build nameplates carry CE / CSA-US / EAC / RCM (reg N20693) but do not stamp the NSF 61 mark (regional marking practice, not a compliance gap). Plan-check submittal combines the Grundfos catalog page (model-level NSF 61 evidence), nameplate photos, and the wetted-parts materials declaration (PVC head / PTFE diaphragm / ceramic balls / FKM gaskets), filed under SD DEH MFF §IV.C. Full submittal package: Metering pumps §8. |
Recent changes
- April 2026: System spec Rev I + BOM Rev H — UV unit procured as Pulsar PUV-200-20 (20 GPM-class lamp/reactor, ≈ 3.5× the throughput of the previously-specified PUV-200-10 at every dose point); pre-filter cartridges and SS housings procured as already specified. UV dose calculation in system overview §3.5 fully recalculated; performance summary, materials and standards, and compliance sections updated to match. Spec-rev change list: RO-SPEC-001 Rev I.
- April 2026: Project rebranded from "Paleo Treats Water Skid" to Juliet Coffee Water System (JCWS) to separate the product identity from the first install location. Docs site moved from
water.paleotreats.comto water.juliet.coffee. BOM CSV filenames changed fromPT-water-BOM-rev-*.csvtoJCWS-BOM-rev-*.csv. Document numbers (RO-SPEC-001 etc.) unchanged. - April 2026: System spec Rev H + BOM Rev G — procurement-anchored part numbers; Docusaurus site + BOM CSV workflow documented (
static/specs/bom/README.md). - BOM moved from Rev F → Rev G; interactive BOM page points at latest CSV.
- System spec advanced Rev G → Rev H (regulatory Rev G work remains in §8.1; Rev H is the procurement alignment).
- Site published at water.juliet.coffee.
Next milestones
- Finalize tank sourcing — confirm Sanke keg modifier or commit to custom build
- PLC bench setup with first I/O test
- Initial draft of HMI screens (CM5 toolchain)
- Pre-submittal meeting with San Diego DEH
How to read this page
The Last updated timestamp at the bottom of every page (this one included) comes straight from git. If something was last touched a month ago, it really was last touched a month ago.