Shanghai Tongjie pitches CE-ready OEM containerized desalination builds

Shanghai Tongjie outlined how it structures OEM containerized seawater desalination projects for EPCs, distributors and private-label brands, with emphasis on design scope, factory testing and European CE compliance. The company said early technical definitions can reduce scope disputes and speed shipment approval for overseas projects.

Why it matters: - Containerized seawater reverse osmosis systems are often built for remote or coastal sites where transport, corrosion resistance, maintenance access and regulatory approval can determine project success. - For EPCs and private-label buyers, the OEM vs. ODM split affects who owns design responsibility, certification work and performance risk. - CE compliance can be a gating item for shipments headed to the European Economic Area and other markets that recognize European technical harmonization.

What happened: - Shanghai Tongjie said it is positioning itself as a fabrication partner for containerized seawater desalination systems built under OEM arrangements. - The company said its process is aimed at global buyers including international engineering procurement companies, regional equipment distributors and private-label brand owners. - Shanghai Tongjie said it supports build-to-print production while aligning with European CE directives and destination-market compliance standards. - The company framed the offering around containerized seawater reverse osmosis, or SWRO, systems.

The details: - Under a pure OEM model, the buyer provides approved drawings, including process and instrumentation diagrams, general arrangement drawings, piping isometrics, electrical single-line schematics and an approved vendor list. - In that model, the factory handles fabrication, structural assembly, pipe welding, wiring and pre-commissioning to the supplied documents. - In an ODM or collaborative engineering model, the buyer defines feedwater analysis, permeate flow, target TDS, ambient climate and utility conditions, while the manufacturer performs process simulations, membrane selection, pump-skid design and control integration. - High-pressure pumping assemblies may specify duplex 2205 or super duplex 2507 stainless steel for wetted parts and IE3 or IE4 motors. - Low-pressure piping commonly uses Schedule 80 UPVC or FRP, while high-pressure lines running between 55 and 70 bar require high-grade stainless steel with passivated TIG welds and liquid penetrant inspection. - Membrane staging can call for qualified brands such as Hydranautics, Dupont FilmTec or Toray. - The bill of materials should freeze instrumentation, including digital magnetic flowmeters, dual-sensor conductivity transmitters and pressure transmitters with 4–20 mA output to the PLC. - Shanghai Tongjie said it works from client-supplied engineering drawings or functional specifications and keeps material traceability from raw pipe stock to finished control assemblies. - The container itself is treated as an industrial shelter, not just a transport shell. - The company described a marine-corrosion protection package that includes internal and external blast cleaning and a multi-coat marine epoxy system rated to C5-M durability. - Interior walls and ceilings may use 50 mm to 75 mm fire-retardant rock wool or polyurethane insulation with chemical-resistant paneling. - Industrial HVAC systems are used to maintain positive air pressure and humidity control for VFD inverters and PLC hardware. - Layout guidance calls for continuous central aisles of at least 800 mm and access hatches or end doors aligned with membrane vessels for easier element loading and removal. - The OEM release process includes a factory acceptance test, or FAT, before shipment. - The FAT sequence includes hydrostatic pressure testing at 1.25 to 1.5 times maximum rated design pressure, hydraulic flow and flux testing, electrical and automation logic simulation, and packaging and export preservation. - The company said FAT packages should include reports, weld inspection records and calibrated instrument certificates for review by buyers and third-party inspectors such as SGS, TUV or BV. - For Europe-bound projects, the Machinery Directive 2006/42/EC applies to the mechanical assembly and safety guarding. - The Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU cover electrical cabinets, VFDs and cabling. - High-pressure piping assemblies above 0.5 bar fall under the Pressure Equipment Directive 2014/68/EU. - The company said OEM documentation should include qualified welding procedures, certified welders and EN 10204 3.1 material test reports. - The FAQ section said OEM builds can be customized with preferred pump, membrane, PLC and switchgear brands. - The FAQ section also said standard FAT documentation includes a signed FAT protocol, hydrostatic pressure test charts, electrical schematic markups, instrument calibration certificates, material test reports and the CE Declaration of Conformity. - The FAQ section said coastal protection can include C5-M marine epoxy paint, thermal insulation, marine-grade HVAC and corrosion-resistant materials such as SS316L, duplex stainless steel and FRP/UPVC.

Between the lines: - The release is less a product announcement than a playbook for buyers trying to lock down scope before ordering custom industrial desalination systems. - The emphasis on drawings, BOM control and FAT documentation suggests Shanghai Tongjie is targeting procurement teams that want repeatable manufacturing with limited design ambiguity. - The repeated focus on CE paperwork and directive coverage signals that regulatory readiness is a core sales message, not an afterthought.

What's next: - Shanghai Tongjie said project teams should submit P&IDs, component specifications, target capacity and destination-market regulatory requirements to its technical team. - The company said that information is used to assess manufacturing feasibility, set FAT milestones and establish OEM lead times. - Buyers can also use the RFQ stage to define testing witness requirements, CE documentation needs and private-label branding before production starts.

The bottom line: - Shanghai Tongjie is pitching a tightly specified OEM path for containerized seawater desalination, with engineering scope control and CE compliance positioned as the main risk reducers.