Ask what the RO package will do when production stops, not only what it produces while running. A planned weekend stop, an operator trip and a complete loss of site power are different purchasing cases. This checklist helps the buyer obtain an agreed cause-and-effect schedule and handover evidence. It is not a valve sequence for operators: the approved instructions for the actual plant and installed elements govern operation.
1. Write a state-and-responsibility matrix
List each credible stopping event with its initiating signal, available utilities, intended equipment state, operator action and person responsible for approval. Separate a controlled production stop from emergency shutdown, power restoration and an extended idle period. Identify who supplies the control logic, who connects the site signals and who accepts the completed sequence. The word automatic is insufficient without named triggers and a demonstrated response.
DuPont's system-operation guidance addresses shutdown flushing and permeate backpressure protection. These FilmTec instructions do not establish the limits or supplied controls of a BOKAWATER package. For an enquiry referencing the existing BK-38 listing, request the configuration-specific piping diagram, valve schedule, control narrative and installed-element manual. Record any unresolved interface as an open purchasing item rather than a presumed included feature.
2. Quantify the proposed shutdown interfaces
Ask the designer to state the proposed flushing source, approved water quality, required flow and duration, minimum usable reserve, monitoring method and discharge destination. Distinguish usable water from tank nameplate volume and record which other users can consume the same reserve. As an arithmetic example only, an assumed 60 L/min for 4 minutes uses 240 L. This is neither a BK-38 requirement nor a validated flushing duty; repeat cycles, inaccessible volume and the designer's allowances remain separate.
For total power loss, ask which actions remain possible when the normal controller, pump or actuated valve has no supply. Obtain the designer's answer for loss of control power and instrument air where relevant, the proposed stored-energy or passive arrangements, and the interface to any site backup supply. Ask how the proposal addresses the connected product-water system and the intended condition of each boundary. Do not assume that a PLC, generator connection or tank alone proves a complete protection scheme.
3. Witness the transitions and define release to production
Agree a supplier-approved test plan before delivery. It should identify which transitions are demonstrated at the factory, which require site connections, which are simulated safely and which remain documentary checks. List prerequisites, observers, recorded signals, pass criteria and restoration steps. A buyer should not create an uncontrolled power interruption as an improvised test. Keep the approved procedure and the actual results together, including any condition that could not be tested.
Set a release checkpoint after an outage or longer stop: responsible operator, relevant inspection and water-quality evidence, unresolved alarms, water disposition and authorization to resume the downstream process. Require the supplier to define when a different preservation and restart procedure is necessary for the installed elements; do not invent a universal safe idle duration. Attach the signed transition record to the equipment handover and request written closure of deviations through the existing enquiry channel.
Data to collect before comparing proposals
| Parameter / interface | Unit / format | Why it matters |
|---|---|---|
| Purchasing decision | Evidence to request | Question to close |
| Stopping cases | Event and utility-state matrix | Which cases are included? |
| Controls | Cause-and-effect schedule and owner | Who approves each response? |
| Flushing | Source, quality, flow and duration | Which duty is actually approved? |
| Water reserve | Usable volume and shared demands | Is the reserve available at a trip? |
| Power loss | Controller, pump and valve states | Which actions survive supply loss? |
| Interfaces | Piping diagram and site backup boundary | Who supplies each connection? |
| Demonstration | Approved test and witnessed results | Which cases remain untested? |
| Restart release | Quality record and operator sign-off | Who authorizes useful-water delivery? |
| Extended idle | Installed-element preservation instructions | When is a different procedure needed? |
Technical references
- DuPont FilmTec RO & NF System Shut-down, Form 45-D01613-en, Rev. 11, February 2026 ↗Source checked:
Evidence scope — original English record
General FilmTec shutdown-flushing and backpressure context only. No numerical limit, chemical recipe or supplied feature is transferred to BOKAWATER. The responsibility matrix, contract questions and arithmetic are original procurement planning, not an operating procedure.
- BOKAWATER OEM 6000 LPH Container RO system, item BK-38 ↗Source checked:
Evidence scope — original English record
Confirms the existing BK-38 containerized RO listing only. The catalog identity is not evidence of a specific shutdown sequence, automatic flush package, stored-water reserve, backup power or outage protection. No additional rating or supplied feature is asserted.