Onboard potable water distribution

Onboard potable water distribution

GF offers marine-approved polymer and multilayer systems with multiple jointing options for reliable hot and cold potable water. With over 30 years of marine experience, we support system selection, technical documentation and project delivery.

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Application

Onboard potable water distribution

Reliable hot and cold potable water is essential throughout a vessel, from cabins and galleys to public areas. GF offers a specialized portfolio of high-performance polymer and multi-layer composite piping solutions explicitly engineered to replace traditional, heavy metallic lines in marine freshwater applications. Formulated to meet the stringent technical demands of modern maritime specifications, these systems serve as a lightweight, non-corroding lifeline for both hot and cold potable water delivery across commercial vessels, yachts, passenger liners, and navy. The advanced material composition effortlessly withstands rigorous marine operating conditions, comfortably handling continuous working pressures of up to 10 to 16 bar and maintaining mechanical integrity across a wide thermal spectrum from 0°C up to 95°C.

By specifying corrosion-free polymer and multilayer piping systems, marine engineers and fleet managers directly resolve the industry’s most persistent piping vulnerabilities. The inherent flexibility of our advanced polymers absorbs intense engine vibrations and structural hull flexing that routinely cause rigid metal lines to suffer fatigue failures. Furthermore, being completely immune to galvanic corrosion, pitting, and mineral scaling, these systems support consistent water quality, optimal flow dynamics, and an extended operational lifespan that virtually eliminates unscheduled drydock piping maintenance.

Maximum corrosion-resistance

Essential for long-term use with seawater and chemicals, preventing leaks and contamination.

Low Scaling Tendency

Minimizes scale buildup on system surfaces, maintaining efficiency and reducing the need for frequent cleaning.

Chemical and Temperature Compatibility

Resistant to chemical treatments and varying temperatures, ensuring consistent water quality and system durability.

40% less noise generation

Plastic materials generate less noise than metal piping solutions

Installation on board the Africa Mercy

More ways to connect

For shipyards focused on maximizing labor efficiency, the systems replace hazardous, time-consuming welding and hot-work permits with rapid, high-integrity jointing technologies. Utilizing fast electrofusion, socket fusion, or push- and press-fitting mechanical connections, installers can execute secure, permanent joints in confined bulkheads and tight bilges, drastically shortening installation timelines and accelerating pressure testing. Ultimately, transitioning from steel or copper to our lightweight polymer networks provides fleet owners with critical deadweight reduction, contributing to improved vessel stability and long-term fuel efficiency.

 

S-Press - Cabin branches & connections

The Uponor Multilayer Pipe System (S-Press) combines multilayer composite pipes with S-Press fittings to deliver a reliable and efficient potable water solution. The press-fit technology enables fast, secure installation with durable connections, while the multilayer pipe construction combines the flexibility and corrosion resistance of plastic with the dimensional stability of metal, making it well suited for demanding marine freshwater applications

Installation - Press fit system

The Uponor S-Press system uses a press tool to secure the fitting to the multilayer pipe. It offers a mechanical connection option for cabin branches and final connections during vessel outfitting.

S-Press

iFIT - Cabin branches & connections

iFIT is a modular push-fit piping system for potable water and heating applications that simplifies installation while reducing inventory requirements. Its unique adapter technology enables up to 50% fewer system components than conventional systems, providing maximum flexibility with minimal stock. Suitable for new builds, retrofits, and renovations, iFIT allows fast, safe, and tool-efficient installation of polybutene and multilayer pipes, including cross-dimensional connections, making it an ideal choice for marine freshwater systems where space, installation speed, and flexibility are critical.

Installation - Push fit system

iFIT connects prepared pipe by inserting it into the fitting, without a pressing operation at the joint. It offers a straightforward assembly option for multiple cabin and point-of-use connections.

iFIT

JRG Sanipex MT - Cabin branches & connections

JRG Sanipex MT is a high-performance multilayer drinking water system designed for maximum hygiene, durability, and ease of installation. Its innovative cone grip connection technology creates water pocket-free connections that help prevent Legionella and bacterial growth, while offering reusable, easy-to-assemble fittings. For marine freshwater applications, JRG Sanipex MT provides excellent resistance to corrosion and limescale, ensuring long-term system reliability and low maintenance. In addition, its recyclable materials and green building certifications support sustainable vessel design.

Installation - Cone Grip Technology

JRG Sanipex MT features an innovative cone grip union connection technology that enables fast and reliable installation using simple tools. The detachable and reusable connections can be easily released and reassembled without additional fittings, simplifying installation, maintenance, and future modifications.

JRG Sanipex MT

INSTAFLEX (Polybutene System) - Distribution System

INSTAFLEX is a hygienic freshwater piping system made of polybutene, designed for reliable drinking water distribution from small installations to large marine vessels. For marine applications, it offers corrosion-free performance, excellent water quality, and a smooth inner surface that helps prevent limescale buildup. Its flexibility reduces the need for fittings and enables fast, easy installation, while its low thermal expansion eliminates the need for expansion joints. Combined with pre-fabrication capabilities, INSTAFLEX helps shipbuilders save installation time, optimize space, and reduce overall project costs.

Installation - Fusion technology

  • Electrofusion
    For compatible distribution pipework, electrofusion joins the pipe and fitting through a controlled heating cycle. It offers a repeatable fusion option for onboard freshwater installations.
    Installation Video
  • Socket fusion
    Socket fusion joins prepared pipe ends to create a continuous run. It can suit planned distribution lines and pre-fabricated pipe sections, helping coordinate installation before work moves on board.
    Installation Video

 

INSTAFLEX

S-Press: Expanding your installation options

Discover the latest addition to our freshwater system offering.  Uponor S-Press extends the range of jointing options available for efficient and reliable potable water installations on board.

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New potable water system for the hospital ship Africa Mercy

As part of comprehensive retrofit, the hospital ship Africa Mercy upgraded its potable water system using polymer piping solutions from GF across critical medical areas. The previous system had begun to show fouling, making a reliable and hygienic replacement essential.

The new system combines the polybutene system INSTAFLEX for main distribution and iFIT multilayer composite piping with push-fit connections for final connections to medical areas, installed under challenging retrofit conditions with limited space. Compared to metal systems, the polymer solution is corrosion-free, prevents incrustation, and supports hygienic water transport. Its lightweight, modular design enabled faster and safer installation, while on-site support and crew training ensure long-term reliability. 

More than 30 years of marine experience

More marine applications

Explore our more than 30 marine applications, approval requirements, and system options designed for safe, efficient operation at sea. Access catalogues and product details to support your project decisions.

Engineering tools

From flow and pressure-temperature calculations to chemical resistance data and K-factors, these resources help you ensure reliability and compliance under real operating conditions.

Design & Planning

Access planning fundamentals, digital libraries, and our online tools for efficient system layout and installation, to streamline project execution and improve efficiency from concept to installation.

Proven references

See how polymer piping systems perform in real-world marine applications. Explore success stories that demonstrate the reliability and long-term value of polymer solutions at sea.

A webinar series for engineers and marine designers exploring how polymer piping can replace metal to boost performance, cut weight, and extend service life in shipbuilding and offshore systems.

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Solutions

FAQs

Which GF systems are available for onboard hot and cold potable water?

GF’s portfolio includes several piping materials and connection options for onboard hot and cold potable-water distribution: Uponor Uni Pipe PLUS or MLC with S-Press press fittings, iFIT push-fit, and INSTAFLEX PB with fusion jointing. The right system depends on the project requirements, and suitability and marine approvals should be checked for the specific system and application.

What should be considered when choosing a jointing method for a ship?

Press-fit connections, such as Uponor S-Press, are made with a specified press tool and jaw. Push-fit connections, such as iFIT, are made by inserting prepared pipe into the fitting. Fusion jointing, used with compatible INSTAFLEX PB systems, joins pipe and fitting using a specified fusion process. Each method has its own pipe-preparation, tooling and inspection requirements.

What should be considered when choosing a jointing method for a ship?

Consider the pipe material and dimensions, operating temperature and pressure, access to the joint, available tools, installation sequence and installer training. For shipboard piping, also check project specifications, applicable marine approvals, inspection requirements and whether workshop prefabrication could help simplify installation on board.

 

Which approvals and technical documents apply to each system?

Approvals depend on the exact pipe, fitting, dimensions, jointing method and intended application. Before specifying or installing a system, check the relevant marine certificates and their scope, along with the technical datasheet and installation instructions. GF can help identify the documentation relevant to your project; confirm the requirements with the project’s classification society and other responsible parties.

How can potable-water quality be protected through the onboard piping system?

Potable-water quality depends on the whole system, from storage and distribution to the outlet, not on the pipe material alone. Specify components suitable for potable water, prevent cross-connections with non-potable systems, and follow the project’s requirements for hygienic design, flushing, disinfection, commissioning and operation.

Can GF support a potable-water retrofit or connect to an existing shipboard system?

Yes. GF supports marine piping projects from planning and system selection through design, installation and commissioning, including retrofit projects. For a connection to existing pipework, the project team should first assess the existing material, dimensions, operating conditions, connection interface and approval requirements to identify a suitable tie-in.

Would you like to know more?

Click here to schedule a consultation with one of our experts and discuss your project requirements or any further questions you may have.

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Georg Fischer Piping Systems Ltd

Ebnatstrasse 111

8201 Schaffhausen

Switzerland