Shanghai Tongjie pitches layout-first approach to marine desalination systems

Shanghai Tongjie Environmental Protection Technology Co., Ltd. says buyers of marine seawater desalination systems should prioritize ship-cabin fit, maintenance access and utility interfaces before capacity. The guidance is aimed at shipyards, naval architects and vessel operators planning installations in cramped machinery spaces.

Why it matters: - Marine desalination gear can fail as an installation project before it fails as a water-production system. - Shipyards and vessel operators need equipment that fits tight machinery spaces, clears hatchways, and stays serviceable at sea. - Poor layout can force expensive hull cuts, piping removal, or schedule delays during refits and drydock work.

What happened: - Shanghai Tongjie Environmental Protection Technology Co., Ltd. outlined what buyers seek in a global marine seawater desalination system company for ship-cabin layouts. - The guidance focused on naval architects, shipyard superintendents, marine technical superintendents, and commercial vessel operators. - The company said vessel watermakers should be designed around physical geometry, access routes, and maintenance clearances before volumetric capacity. - The company also said shipowners should provide vessel drawings, hatch dimensions, power specifications, and freshwater production targets for a customized layout brief.

The details: - Marine companionways, watertight doors, and access hatches typically offer clear widths of 600 mm to 800 mm. - A rigid, monoblock watermaker can create installation bottlenecks in tight ship spaces. - Split-skid designs divide the system into transportable sub-assemblies that can pass through standard watertight doors and be reassembled inside machinery spaces. - Typical sub-modules include a raw seawater boost and pre-filtration skid, a high-pressure pump module, an independent membrane rack, and a bulkhead-mounted control cabinet. - Machinery spaces can face ambient temperatures up to 45°C to 50°C, high noise, dense piping, and limited headroom. - Open or semi-enclosed deck installations need weather-tight enclosures rated IP65 or higher and C5-M marine-grade epoxy coatings. - Hazardous areas on crude oil tankers, chemical carriers, and offshore rigs may require ATEX/IECEx Zone 1 or Zone 2 compliance, flameproof enclosures, and intrinsically safe sensor loops. - Marine installations must handle vibration, hull flexing, and vessel roll and pitch up to 22.5 to 30 degrees in severe seas. - Marine watermakers should use vibration isolators, flexible high-pressure hoses, marine electrical supplies at 440V/60Hz, 380V/50Hz, or 690V, and clean interfaces for sea chest intake and overboard brine discharge. - High-pressure seawater circuits operating at 55 to 70 bar require corrosion-resistant alloys such as duplex 2205 or super duplex 2507. - Low-pressure pre-treatment and permeate lines can use Schedule 80 UPVC or FRP. - Membrane vessels need at least 1,200 mm of unobstructed axial clearance at one end for 40-inch spiral-wound membrane replacement. - Cartridge filter housings should have front-facing swing-bolt closures so crew can replace 5-micron cartridges without overhead rigging. - Shanghai Tongjie said its skids use an ergonomic front-facing operating station with pressure gauges, flowmeters, and a central touchscreen. - Automated startup routines slow motorized valves, monitor permeate salinity, and divert off-spec water overboard until potable purity reaches TDS below 500 mg/L.

Between the lines: - The message is that marine desalination is as much a ship-integration problem as a mechanical one. - Layout-first design reduces retrofits, lowers crew workload, and improves the odds that the system can be installed inside cramped vessel envelopes. - The emphasis on modularity, access, and automation also reflects the realities of lean shipboard staffing.

What's next: - Shanghai Tongjie is asking shipyards and vessel owners to submit general arrangement drawings, deck footprint dimensions, hatchway measurements, power data, and sea chest details. - The company says it will return a customized 3D spatial layout, split-skid configuration drawing, and technical quotation. - More information is available via the company's social channels, including LinkedIn, Facebook, TikTok, and X.

The bottom line: - For shipboard desalination buyers, the winning system is the one that fits, survives marine conditions, and stays easy to service inside a crowded vessel layout.