How to find the right Tubes, Pipes & Hoses AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Tubes, Pipes & Hoses
- Sizing convention
- Hose is sized by inside diameter, tubing by outside diameter, and pipe by nominal pipe size (NPS), whose actual OD differs from the nominal number. Mixing these conventions is the most common reason a part arrives and does not fit its fittings.
- Working pressure vs system pressure
- Rated working pressure must meet or exceed the maximum system pressure, including spikes. SAE J517 hydraulic hose uses a 4:1 burst-to-working-pressure safety factor. Hydraulic and pneumatic failures are sudden and can injure people, so the rating is the hard limit.
- Media and temperature compatibility
- Check the material against the fluid (oil, fuel, water, air, chemicals) and the full operating temperature range. Plastic pressure ratings fall as temperature rises. An incompatible elastomer or plastic swells, cracks or leaches long before its pressure rating is reached.
- End connection standard
- Match the thread or fitting type exactly: NPT and BSP threads are not interchangeable, JIC 37° and SAE 45° flares do not seal together, and push-to-connect fittings need tubing within OD tolerance and of suitable hardness. A near-match can thread on or push in and then leak or blow off under pressure.
- Bend radius and routing
- Do not route hose or tube tighter than its stated minimum bend radius, and avoid twisting hose during installation. Over-bending kinks tube and shortens hose life at the fitting.
- Potable or food contact
- For drinking water, look for NSF/ANSI 61 listing. For food contact, look for materials stated as FDA compliant. General-purpose tubing can leach plasticizers or odors into water and food.
Brands that matter
- Parker: Broad hydraulic hose, pneumatic tubing and fitting systems with published ratings.
- Gates: Major hydraulic and industrial hose maker with matched crimp fittings.
- Eaton: Hydraulic hose and fittings, including the Aeroquip and Weatherhead lines.
- Swagelok: Reference brand for instrumentation tube fittings, for use with properly specified tubing.
- Saint-Gobain (Tygon): Flexible lab and fluid-transfer tubing in many chemical-resistance formulations.
- Kuriyama: Industrial PVC and rubber hose for water, air, suction and material handling.
- Freelin-Wade: Pneumatic nylon and polyurethane tubing made to push-fit tolerances.
What to avoid
- Listings that give only a single size number without saying whether it is ID, OD or nominal.
- Unbranded hydraulic hose with no stated SAE or EN standard and no working pressure rating.
- Reusing hydraulic hose ends or mixing crimp fittings from one brand with hose from another unless the maker approves it.
- Clear vinyl tubing used for pressurized compressed air.
Questions
Is tubing the same as pipe?
No. Tubing is specified by exact OD and wall thickness. Pipe is specified by nominal size and schedule, and its fittings are not interchangeable with tubing fittings.
Can I use a pneumatic hose for hydraulics?
No. Hydraulic systems run at far higher pressures and need hose rated to a hydraulic standard, together with matching fittings.