Metal, PTFE and composite hoses
Technical reference and selection guides on metal, PTFE and composite hoses.
15 guides
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Construction of corrugated metal hoses
A corrugated metal hose is a type of hose that derives its flexibility from the corrugated structure of a metal tube wall. Fluid contact, pressure, temperature, motion and end fittings are evaluated together; the name s…
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Braid and pressure in metal hoses
The outer braid of a metal hose is part of the design for carrying the loads that arise under pressure. The number of braid layers does not on its own determine the pressure rating; the body, diameter, material, tempera…
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Vibration and fatigue in metal hoses
The vibration resistance of a metal hose cannot be demonstrated merely by passing a static pressure test. The direction, amplitude and frequency of motion, the live length and the stresses near the fitting are evaluated…
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Weld and document checks on metal hose ends
In a welded metal hose, the material document, weld fabrication and the finished assembly test are different pieces of evidence. A single certificate does not automatically cover all of these; the required documents mus…
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Static and dynamic installation of metal hoses
The static minimum bend radius is not automatically valid for dynamic use. In a dynamic application, the radius, live length and routing for the product's motion condition must be used; static and dynamic values are kep…
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Smooth-bore and convoluted PTFE hose
The choice between smooth-bore and convoluted PTFE hose is not made on the basis of flexibility alone. Flow and cleaning requirements, bending space, permeation, pressure and fitting construction are evaluated together;…
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The concept of static-dissipative PTFE hose
Antistatic PTFE is not considered to have the same electrical properties as an ordinary PTFE inner tube. The required electrical behavior must be clearly defined in the product code and manufacturer data, and verified t…
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Permeation and gas service in PTFE hose
Permeation is a behavior related to the ability of a fluid to pass through the hose material; it is not the same as a visible hole or a fitting leak. In gas transfer, the inner tube, gas type, pressure, temperature and …
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Evaluating temperature and pressure together in PTFE hose
The pressure and temperature limits of a PTFE assembly cannot be derived solely from the general properties of the PTFE polymer. The inner tube, reinforcement, end fitting, seal and the manufacturer's temperature-depend…
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Technical questions in fluoropolymer hose selection
For fluoropolymer hose selection, the process questions must be answered first: which fluid, which temperature, which pressure, what cleaning and what kind of motion? Choosing PTFE or another material name does not on i…
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Layered construction of composite hoses
A composite hose is a construction in which several film or fabric layers and support elements work together. It is not evaluated like a one-piece rubber hose; the inner and outer wire, layer materials and end assembly …
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Chemical and fuel service with composite hoses
When selecting a composite hose for chemical and fuel transfer, a 'chemical hose' or 'fuel hose' label alone is not sufficient. The composition of the fluid, layer and wire materials, cleaning condition, pressure and el…
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Electrical continuity in composite hoses
The electrical continuity of a composite hose is evaluated on the finished assembly using a defined measurement method. The acceptance limit is not a single number for all composite hoses; it must be taken from the manu…
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End fittings and assembly limits for composite hoses
The end assembly of a composite hose is not a generic fitting choice independent of the hose body. The hose series, layers, wire construction, fitting and assembly method must be verified together; haphazard re-tighteni…
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Storage and inspection of composite hoses
Storage and daily inspection of composite hoses must be planned so as to protect the wire and layer construction. Sharp bending, torsion, dragging and unsuitable cleaning are prevented; the manufacturer's criteria are u…
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