High quality PE-hoses for water, chemistry and food

Technical Properties and Materials

PE hoses in this category are predominantly made of cross-linked polyethylene (PEX) or high-density polyethylene (HDPE) and are specifically developed for water, chemical, and food applications. Cross-linked PE combines the chemical resistance of polyethylene with increased thermal stability and improved flexibility. The hoses are available in several colors (clear/straight, black, green, red, blue, yellow, white), have a low density, and are optionally UV-stabilized and silicone-free to minimize contamination risks in sensitive applications. Food-grade variants comply with relevant EU standards for food contact materials and are thus approved for direct product contact and dosing.

Designs, Wall Construction, and Dimensions

Designs range from single-wall flexible hoses to reinforced, spiralized versions and co-extruded types with internal or external coatings. Wall thicknesses are matched to pressure and temperature applications: thin-walled, highly flexible types for low pressures and temperature resistance up to approx. 60 °C, and thick-walled PEX variants for higher operating pressures and temperatures up to approx. 95–110 °C for short-term applications. Inner surfaces are smooth to reduce deposits and simplify cleaning cycles. A transparent (colorless) design facilitates visual inspection of media flow and contaminants, while colored hoses allow for color coding.

Connections, Fittings, and Seals

PE hoses are used with screwed, clamped, and crimpable connection solutions. Chemical and food processes require seals made of EPDM, FPM (Viton), or PTFE depending on the medium and temperature. EPDM is the standard choice for water and many aqueous media; FPM offers extended resistance to organic solvents and oils; PTFE seals provide the highest chemical resistance to aggressive substances. For secure connections, form-fitting fittings with strain relief rings are recommended to reduce kinking stress and microbial dead spaces. In crimpable press connections, beads and overlaps are designed to keep the inner surface as smooth as possible and prevent dead spaces.

Chemical Resistance and Selection Criteria

PE exhibits excellent resistance to many inorganic chemicals, alkalis, and aqueous acids. However, organic solvents, aromatic hydrocarbons, and chlorinated solvents attack PE; in these cases, PEX variants with special additives or alternative materials should be considered. Selection criteria include not only medium chemistry but also temperature, operating pressure, flow velocity, and required flexibility. Consult compatibility data sheets and, for critical applications, conduct material tests under real process conditions. Contact corrosion on metallic fittings can be avoided by using suitable plastic or stainless steel connections.

Temperature, Pressure, and Service Life Properties

PE hoses are designed for continuous operation in a typical range of -40 °C to +60 °C; however, cross-linked PE types allow use up to 95–110 °C for short-term loads. Pressure ratings vary by diameter and wall thickness; thin-walled, flexible variants are designed for low pressures, while reinforced and thick-walled types cover peak pressures in industrial applications. Aging resistance is improved by UV stabilizers and antioxidants; for outdoor applications, UV-stabilized types are mandatory. Silicone-free versions ensure that no interfering residues affect further processing or measurements.

Application Areas and Practical Examples

PE hoses are suitable for process water, cooling circuits, dosing systems, cleaning agent supply, food and beverage production, and many chemical conveying tasks with compatible media. Practical examples illustrate their use and show concrete implementations:

• In a beverage filling plant, a transparent, food-grade PEX hose system transports purified water to the CIP system. The smooth inner surface reduces biofilm buildup, EPDM seals on quick couplings enable standard-compliant CIP sealing and simplify cleaning cycles. Control points for temperature and conductivity are integrated along the line.
• In a galvanizing line, a black, UV-stabilized PE hose is used to convey corrosive rinsing media. PTFE seals at the connections prevent chemical attack, while reinforced walls and thick-walled designs secure the operating pressure at pump stations. Hose lengths are kept short and routed in pipe trays with retaining devices to minimize elongation and kinks.
• In a water treatment plant, a colored PE hose transports dosing solutions such as chlorine or antiscalants. Color coding reduces confusion, crimpable stainless steel fittings with EPDM seals ensure pressure-tight and chemically resistant transitions. Maintenance intervals include visual inspections of couplings and regular pressure tests.

Integration into Systems and Installation Notes

During integration, attention must be paid to kink-free laying, sufficient strain relief at transitions, and the selection of compatible fittings. Bending radii are material-dependent and must be strictly observed to avoid premature fatigue. Cutting edges must be clean and at right angles; ends should be deburred if necessary. Crimping or screwing procedures must match the hose dimension, and sealing materials must be adapted to the process conditions. For temporary supply lines, quick couplings with defined dead space values can be used. It is recommended to document all material and connection data in the plant P&ID and to implement inspection plans for pressure and leak tests after installation.

Cleaning, Sterilization, and Hygiene

Food applications require validated cleaning and sterilization concepts. PE hoses with a smooth inner surface and silicone-free composition simplify cleaning processes. For regular CIP and SIP cycles, temperature and chemical compatibility must be checked; PEX is generally better suited for higher temperatures than unvulcanized HDPE. Aseptic connection elements and easy-to-disinfect surfaces reduce microbial risk. For critical applications, HACCP documentation should be available.

Standards, Certificates, and Material Data

Important proofs include food conformity declarations, EU regulations on food contact materials, pressure equipment standards, and, if applicable, ATEX certificates for potentially explosive atmospheres. Manufacturer data sheets provide information on tensile strength, Shore hardness, specific density, temperature and pressure ratings, and chemical resistance. Use technical documentation from manufacturers like Parker Legris for precise design and spare part specification. Further technical background information can be found on our technology page: https://maku-industrie.de/technik and specific application examples under https://maku-industrie.de/anwendungsbeispiele.

Quick Check for Selection

Check material compatibility, temperature and pressure requirements, desired flexibility, and hygienic requirements. Select sealing materials according to the medium and use UV-stabilized or silicone-free variants where necessary. For food and drinking water applications, prioritize food-grade, transparent, or specifically colored hoses with a smooth inner surface.

FAQs

1. Which PE hose types are suitable for food?

Food-suitable variants are food-grade certified PEX or HDPE hoses with corresponding conformity declarations. Pay attention to silicone-free composition, smooth inner surface, and approved sealing materials such as EPDM. Transparent versions facilitate visual inspection.

2. How do I choose the right seal for aggressive chemicals?

Select seals based on chemical resistance: EPDM for water and aqueous media, FPM for broader organic resistance, PTFE for aggressive, corrosive substances. Check temperature and pressure limits and conduct material tests if compatibility is uncertain.

3. What are common installation errors with PE hoses and how can I avoid them?

Common errors include excessively tight bending radii, insufficient strain relief, unclean cut edges, and unsuitable fittings. Avoid these by adhering to manufacturer specifications for bending radius and installation, clean end finishing, suitable crimp or screw connections, and documented leak tests after installation.