CE Certification Sea Water Plant Factories & Factory

Engineers require a comprehensive lab analysis detailing Total Dissolved Solids (TDS), major cations (Na⁺, Ca²⁺, Mg²⁺, Ba²⁺, Sr²⁺), anions (Cl⁻, SO₄²⁻, HCO₃⁻), silica (SiO₂), boron, pH, Silt Density Index (SDI₁₅), total suspended solids (TSS), and temperature fluctuations across seasons. Feed salinity and seasonal temperature dictate membrane flux, osmotic pressure, and high-pressure pump motor sizing.

CE compliance for water treatment machinery integrates multiple EU directives: Pressure Equipment Directive (PED 2014/68/EU) covers all vessels, valves, and piping pressurized beyond 0.5 bar; Machinery Directive (2006/42/EC) verifies mechanical risk controls for high-pressure pumps; and the Low Voltage/EMC Directives validate electrical safety and control architecture. A notified body examines technical files, weld qualifications, and hydrostatic tests before issuing the Declaration of Conformity.

Seawater high-pressure feed typically contains chloride levels ranging from 19,000 to 25,000 mg/L under pressures up to 85 bar. Grade 316L stainless steel has a PREN of ~25, making it susceptible to rapid pitting and crevice corrosion under high aeration and static stagnation. Super Duplex 2507 (1.4410) provides a PREN exceeding 42, ensuring structural resilience against localized chloride attack and stress corrosion cracking.

High-performance polyamide thin-film composite SWRO membranes typically deliver an operating life of 4 to 7 years. Longevity depends on effective pretreatment: keeping feed SDI₁₅ below 3.0, ensuring zero exposure to free chlorine via online ORP/sodium bisulfite control, dosing antiscalants to prevent sulfate/carbonate precipitation, and executing automated low-pressure permeate flushes during every scheduled or emergency plant shutdown.

Containerized desalination packages shift 90% of structural piping, electrical wiring, PLC control integration, and pressure testing from the remote field site to an ISO-controlled factory environment. Skids undergo complete Factory Acceptance Testing (FAT) with wet commissioning prior to export, reducing field installation schedules from six months to under two weeks, while eliminating on-site hot-work permits and fabrication errors.

Yes. Tongjie produced water treatment trains utilize open-channel Disc Tube Reverse Osmosis (DTRO) modules. Unlike standard spiral-wound configurations that foul when exposed to residual hydrocarbons and high TSS, DTRO modules feature wide flow pathways and hydrodynamic disc spacers that tolerate high silt loads and total salinity up to 100,000 ppm TDS, enabling long continuous service cycles.