Turnkey Water Treatment Plant: Scope and Handover

The supplier scope normally follows seven stages. Design starts with a water analysis review and ends with an approved drawing set. Manufacturing covers vessel fabrication, skid assembly, piping, wiring and panel building. Factory testing includes pressure, electrical, instrument and wet tests. Shipping covers preservation, packing, lifting plan and export documents. Installation is handled by manual and remote support, or by a supervisor on site. Commissioning usually takes 3–7 days and proves flow, pressure, recovery and water quality. Training covers start-up, backwash, cleaning and troubleshooting. Typical lead time is 30–60 days after drawing approval, with factory testing completed before shipment.

The buyer scope is the site and everything that touches it. That includes a level foundation designed for the operating weight, a power supply with cable and breaker sized to the installed load (typically 7–30 kW), a raw water connection at the agreed pressure and flow, a drain sized for backwash and concentrate, treated-water storage, and all local permits and inspections. Chemicals, spare parts beyond the initial set and local labour are also buyer items unless the quotation says otherwise.

Two items are often forgotten. The first is treated-water storage: the plant produces water, but it does not build the tank or the distribution loop. Storage is normally sized at 30–50% of daily demand, and the loop is a separate scope item. The second is the import and inland transport scope. A quotation that says FOB or CIF leaves customs clearance, inland haulage, unloading and site storage with the buyer, and those steps can delay commissioning as much as a manufacturing delay.

Verify readiness before shipment, not on arrival. Send the supplier photographs of the foundation, terminal box, raw water flange and drain, and ask for written confirmation that each interface is acceptable. This takes an hour and prevents the most expensive kind of delay: a plant that is complete, paid for and idle.

Most disputes are not about equipment quality; they are about readiness. Power is not terminated, the drain is undersized, the foundation is 50 mm out of level, or the treated-water tank has not been ordered. The plant arrives complete and cannot be started, and both parties begin counting standing time.

The second common failure is scope ambiguity around installation. A quotation may include commissioning but not installation supervision, or may include a supervisor for five days without stating what happens after day five. The third is acceptance: if the contract does not define the test conditions, flow, pressure and water quality, the handover can stall on a reading that nobody agreed to measure.

Installation starts with setting and levelling the unit, anchoring it, and connecting power, raw water, treated water and drain. The supplier checks the interfaces against the drawing before energising. Commissioning then follows a fixed sequence so that each step is proven before the next begins. The sequence usually takes 3–7 days, including a 5 µm cartridge check and a UV dose verification at 30–40 mJ/cm².

Keep a commissioning log with date, time, reading and initials. The log becomes the baseline for later maintenance, and it is the first document an operator should check when permeate flow seems low. Without a baseline, every decline looks like a fault, and every fault looks like a membrane problem.

The handover package should be usable without the supplier present. Keep 2 sets of documents: one in the control panel pocket and one in the site office. The package normally includes the general arrangement drawing, P&ID, electrical schematic, terminal list, factory test report, commissioning report, operation and maintenance manual, spare parts list and training record. Drawings should reflect as-built conditions, not the original design if changes were made on site.

Training should be hands-on, not a slide presentation. A 2-day session is usually enough for operators to start and stop the plant, perform a backwash, prepare a cleaning solution, read the pressure drop and interpret an alarm. Record who attended and which tasks they performed; a training record without a practical demonstration is weak evidence at handover.

Write the scope as a matrix, not as a paragraph. Each row is an item, each column is a party, and every cell says supply, install, test or exclude. Attach the matrix to the quotation and make it part of the contract. Where a cell is unclear, treat it as excluded until it is agreed in writing; that is safer than assuming inclusion and discovering the gap at commissioning.

State the acceptance criteria in measurable terms: permeate flow in m³/h at a stated temperature, recovery percentage, permeate conductivity in µS/cm, and a continuous run of at least 4 hours. State who provides feed water, power and chemicals for the test, and what happens if those are not ready. Finally, list the documents that must be delivered before the final payment is released.

Use the same matrix for change orders. When the buyer adds a tank, moves the plant or changes the power supply, update the matrix and re-price the affected rows. A scope matrix that is not maintained becomes fiction within a month of contract signature.