A global leader in FRP pressure vessels

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OUR COMPANY

Built on manufacturing scale. Driven by international expertise.

First line International is the global commercial platform of Harbin First Line Group, a Chinese manufacturer with over a decade of experience producing high-pressure composite vessels for the global water industry.

Our PRODUCTS

Engineering complete water treatment solutions

From high-pressure composite vessels to couplings, cartridge filtration, and fully engineered skid systems, Firstline delivers the critical components and integrated solutions that power efficient water management worldwide.

Four product lines. One integrated solution.

Every component Firstline manufactures is engineered to work as part of a complete water treatment system, from the vessel that withstands the highest pressures to the skid
that brings it all together.

PRESSURE VESSELS

High-pressure FRP composite vessels engineered for reverse osmosis, desalination, and demanding industrial applications. Field-proven across 40,000+ units and 11 countries.

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COUPLINGS

Precision-engineered connectors that ensure leak-free, high-pressure performance across vessel arrays — designed for long-term reliability under continuous operating stress.

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CARTRIDGE FILTERS & HOUSINGS

Pre-treatment filtration solutions that protect downstream membranes and extend system life, available in a full range of capacities and configurations.

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SKID ENGINEERING & MANUFACTURING

Fully engineered, plug-and-play skid systems, integrating vessels, filtration, and piping into a single, factory-tested unit ready for fast on-site deployment.

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Technology

Our pressure vessels are engineered to perform under the most demanding conditions in water treatment, from seawater reverse osmosis at 1,200 PSI to zero liquid discharge at extreme salinity levels.

Every vessel is designed, tested, and certified to international standards before it leaves our facility,
ensuring reliable performance over decades of operation.