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Top Tips for Hydraulic Hose Routing - Hose Products DivisionSafety and performance are top considerations when using hydraulic hose. To guarantee productivity and prevent potential hazards in the work environment, proper installation is imperative. A safe work environment and desired performance both require proper hydraulic hose routing, and these helpful installation tips are one way to ensure efficiency and help prevent premature hose failure.

The routing of a hose assembly and the environment in which the hose assembly operates directly influence the service life of the hose assembly. Proper routing of hose assemblies will maximize service life and ensure a safe working functionality.

Ten tips for safety and performance
  1. Top Tips for Hydraulic Hose Routing - Hose Products Division - Hose FlexibilityAllow for Slack: Use tools that provide enough slack to allow for changes in length to occur when hose is pressurized. Hydraulic hose is capable of elongating up to 2% or contracting up to 4%, depending on construction. The hose length must be determined so that the hose assembly has enough slack to allow the system components to move or vibrate without creating tension in the hose. The service life of hose is reduced if hose assemblies do not permit adequate flexing and allow for length changes due to expansion or contraction. When pressurized, a hose that is too short may stress the hose fitting connections or pull loose from its fittings, causing premature metallic or seal failures. It is important not to allow too much slack and therefore introduce the risk of the hose snagging on other equipment or rubbing on other components.
  2. Top Tips for Hydraulic Hose Routing - Hose Products Division - Bend RadiusDo Not Exceed Minimum Bend Radius: Use tools to avoid exceeding the minimum bend radius. Bending hose beyond the recommended bend radius places excessive stress on hose reinforcement can create large holes between strands of hose reinforcement, and severely reduces the hose's pressure capacity. Exceeding the minimum bend radius can result in a burst hose. The minimum bend radii for each hose is stated in the hose tables in the catalog.
  3. Avoid Twisting the Hose: Avoid placement that requires twisting the hose during installation, as it misaligns the reinforcement and reduces a hose’s capacity to withstand pressure. A simple way to identify twisting is to look at the layline, which is the continuous line of information printed on a hose with the part number, pressure, etc. If the layline is twisted like a candy cane, it means that the hose was twisted during installation, which can cause premature hose failure.
  4. Top Tips for Hydraulic Hose Routing - Hose Products Division - Elbows and AdaptersUse Elbow Fittings or Adapters When Necessary:  A general rule of thumb for hose installation is if the hose needs to bend immediately before the metal fitting, you should keep it straight for at least twice the outside diameter (O.D.). If that’s not possible, use a 90 or 45-degree elbow fitting. This prevents fluid under pressure, traveling at high speeds, from directly impacting the core tube, which can deteriorate the hose and cause premature failure. Adapters ease port connections and hose installation and can be used to change thread configuration. Adapters should be used sparingly to keep assembly components at a minimum to avoid longer assembly time and cost, and prevent potential leak points in hose assembly.
  5. Avoid Abrasive Influences: Avoid placing hose near any object with sharp or abrasive surfaces, or too close to other hoses as direct surface contact with equipment components, hoses, or material in the operating environment will cause abrasive wearing of the outer cover, risking exposure of the reinforcement. However, if the application is such that contact cannot be avoided, either a hose with a higher abrasion resistant hose cover or a protective sleeve should be used. Parker ToughCover (TC) or SuperTough (ST) covers offer 80 times and 450 times respectively the abrasion resistance of standard rubber covers.
  6. Top Tips for Hydraulic Hose Routing - Hose Products Division - Proper ClampingThe Plane of Movement Must be Considered:  Be sure to route high-pressure hydraulic hose parallel to machine contours using elbows or adapters. This decreases the length of hose lines and reduces hard angle bends that restrict flow and strain the hose, saving money and maximizing hose capability.
  7. Do Not Mix Hoses and Fittings: To ensure maximized service life and safe function, do not mix and match hoses and fittings from different manufacturers. It is vital to work capability and safety that the hose and fitting manufacturer are the same, and that the assembly uses the recommended equipment, parts, and procedures as per the manufacturer. Correct fittings can avoid unnecessary strain on the hose, excess length, or multiple threaded joints.
  8. Top Tips for Hydraulic Hose Routing - Hose Products Division - Avoid Hose StrainThere is a Right and Wrong Way to Clamp Hoses:  Keep in mind the mechanical movement and vibration of hose when bundling. Crossing or clamping high- and low-pressure hoses together can lead to wear in the hose covers, decreasing productivity and risking safety hazards. Correct clamping should be exercised to securely route the hose and avoid the hose contacting surfaces that will cause the hose damage. If hose follows a compound bend, it should be coupled into separate segments or clamped into segments that flex on a single plane.
  9. Temperature Directly Affects Hose Life: Keep hydraulic hoses away from external heat sources, as high ambient temperatures shorten hose life. Temperature increases of can lead to cracking and shorten hose life. The more extreme the ambient temperature is, weather hot or cold, the more durable the hose cover needs to be. Another option would be installing sleeves, which can help protect hose from hot equipment parts and other high temperature sources that are potentially hazardous.
  10. Plan for Future Maintenance: Few things are more aggravating that having to take apart adjoining assemblies to access a specific hose that needs maintenance. Avoid this scenario by using different combinations of hose ends and tube fittings, such as short and long straights, or short and long elbows. Taking this step when installing a hose reduces maintenance effort and downtime. Avoid unnecessary hose strain by utilizing elbows and adapters for ease of routing. These tools help to relieve strain on the assembly and allow for clean, accessible installations. Inspection and maintenance might be necessary, so prohibitive design routings of hose assemblies should be avoided.

For more information about hose installation and routing, watch the video below or contact your Parker representative.


Kyri McDonough, Hose Products Division, Parker HannifinArticle contributed by Kyri McDonough, marketing services manager at Hose Products Division, Parker Hannifin.





Other related topics on hydraulic hose, hose application, and selection criteria:

Top 5 Reasons Customers Choose GlobalCore Hose
Measure and Specify Hydraulic Hose Length With Ease
Decoding a Hydraulic Hose Layline
Top 8 Reasons Hydraulic Hoses Fail
Hydraulic Hose User Safety


Top Ten Tips for Hydraulic Hose Routing

Read More

Parker O-Ring Size SelectorTwo things are equally important for reliable performance of an O-ring seal: the right size and the right material. Parker’s new O-Ring Selector is an engineering design tool that enables users to make the right material and size selections easily, quickly and reliably – in a single application. This post explains how to design the sealing system using the “Size Selector.”

See also blog post:



Einbausituation praezise kalkuliert - O-ring size selector

Precise calculation of installation conditions: fast and easy with the “Size Selector”

The “Size Selector” calculates the installation conditions and the suitable O-ring. It is divided into three segments: “Hardware Configuration,” “Sizing Selection” and “Results” (of the calculation).


Description of the system to be sealed

The “Hardware Configuration” segment is used for a detailed description of the sealing system. The user can choose between two radial (Piston und Rod Seal) and two axial (Internal and External Pressure) sealing systems. Subsequently, these choices can be specified in greater detail by selecting liquid systems or gas/vacuum systems. The selection of the various options is intuitive due to the clear, graphic presentation of the individual sealing systems. 

“Hardware Configuration” also includes a look at the diverse thermal expansion coefficients of the hardware components. Representative values, e.g. for steel or aluminum, are available here. Of course, if known precisely, these values may also be entered manually to parameterize the sealing system with maximum accuracy. Chemical swelling of the seal itself may be included in the calculation as well.








  Calculation of the sealing system

The “Sizing Selection” segment is focused on the comprehensive calculation of the system to be sealed. If known, all values such as O-ring diameter, piston diameter, etc. can be entered manually. Alternatively – if complete information is not available – an automatic parameterization of the sealing system can be performed via the selection of the O-ring diameter and (for instance) the targeted piston diameter. All the individual values calculated this way can be adjusted manually in a second step and their effects on the functionality of the sealing system reviewed. The toleration of the hardware components can be adjusted to the user’s application as well to satisfy the various quality requirements in the manufacturing process.













Review of results

The “Results” segment displays the calculated results in a structured manner. For the key results parameters, the recommendations are shown according to ISO/Parker specifications. In addition, minimum and maximum tolerations for the results parameters are indicated. A simple visual check if the calculated sealing system corresponds to ISO/Parker recommendations is made using color codes: green stands for “Recommended,” yellow for “Warning” and red for “Critical.”  

 Users can enter their own comments on the calculations made in “Notes.” After the review of the sealing system has been completed, the data obtained can be converted into a PDF.



O-Ring Selector







>>> Start imperial version
>>> Start metric version



Additional information:



Posted by:  

Heinz Christian Rost



Dr. Heinz-Christian Rost
Technology & Innovation Manager
Engineered Materials Group Europe, Prädifa Technology Division




O-Ring Selection Made Easy with the Parker O-Ring Selector

How to Select the Right O-Ring Material with the Parker O-Ring Selector



How to Calculate the Right O-Ring Size with the Parker O-Ring-Selector

Read More

Parker O-Ring Size SelectorZwei Dinge sind für die zuverlässige Funktion einer O-Ring-Dichtung gleichermaßen wichtig: die richtige Größe und der richtige Werkstoff. Der neue O-Ring-Selector von Parker ist ein Konstruktions-Tool, das es dem Anwender ermöglicht, einfach, schnell und zuverlässig die geeignete Material- und Größenauswahl zu treffen – in einer einzigen Anwendung. In diesem Beitrag wird die Auslegung des Dichtsystems mit Hilfe des „Size Selectors“ erläutert.

Siehe auch Blog Posts



Einbausituation praezise kalkuliert - O-ring size selector

Einbausituationen präzise kalkuliert: einfach und schnell über den „Size Selector“

Im Bereich „Size Selector“ (Größenauswahl) erfolgt die Berechnung der Einbausituation und des geeigneten O-Rings. Dabei unterteilt sich der „Size Selector“ in drei Segmente. Die „Hardware Configuration“, die „Sizing Selection“ und die Ergebnisse der Berechnung („Results“):


Beschreibung des abzudichtenden Systems

Im Segment „Hardware Configuration“ erfolgt eine detaillierte Beschreibung des Dichtungssystems. Dabei kann zwischen zwei radial abdichtenden (Piston und Rod Seal) und zwei axial abdichtenden (Internal und External Pressure) Dichtungssystemen gewählt werden. Diese lassen sich dann jeweils weiter durch die Auswahl von Flüssigsystemen oder Gas-/Vakuumsystemen spezifizieren. Die Auswahl der verschiedenen Optionen ist aufgrund der klaren graphischen Darstellung der einzelnen Dichtungssysteme intuitiv.

Die „Hardware Configuration“ schließt auch die Betrachtung der unterschiedlichen thermischen Expansionskoeffizienten der Hardware-Komponenten mit ein. Hier kann auf repräsentative Werte beispielsweise für Stahl oder Aluminium zurückgegriffen werden. Bei genauer Kenntnis können die Werte aber natürlich auch manuell eingetragen werden, um eine möglichst genaue Parametrisierung des Dichtungssystems zu erreichen. Auch kann die chemische Quellung der Dichtung selbst in der Kalkulation berücksichtigt werden.









Berechnung des Dichtsystems

Das Segment „Sizing Selection“ konzentriert sich auf die umfassende Berechnung des abzudichtenden Systems. Wenn bekannt, können alle Werte wie O-Ring-Durchmesser, Kolbendurchmesser etc. manuell eingetragen werden. Es kann jedoch auch – bei  nicht vollumfänglicher Informationslage – über die Auswahl des O-Ring- Durchmessers und beispielsweise des angestrebten Kolbendurchmessers eine automatische Parametrisierung des Dichtungssystems durchgeführt werden. Alle so berechneten Einzelwerte können in einem zweiten Schritt manuell angepasst und die Auswirkung auf die Funktionsfähigkeit des Dichtungssystems betrachtet werden. Die Tolerierung der Hardware-Komponenten kann ebenso dem realen Fall angepasst und somit den unterschiedlichen Qualitätsanforderungen im Herstellungsprozess Rechnung getragen werden.














Im Segment „Results“ werden die kalkulierten Ergebnisse strukturiert dargestellt. Für die wichtigsten Ergebnisparameter werden Empfehlungen (Recommendation) gemäß ISO-/Parker-Spezifikationen dargestellt. Weiterhin werden Minimal- und Maximal-Tolerierungen für die Ergebnisparameter angezeigt. Eine einfache visuelle Überprüfung, ob das kalkulierte Dichtungssystem den ISO- / Parker- Empfehlungen entspricht, erfolgt über eine entsprechende farbige Kennzeichnung: grün steht für „Empfehlung“ („Recommended“), gelb für „Warnung“ („Warning“), rot für „kritisch“ („Critical).

Eigene Kommentare zu den durchgeführten Kalkulationen können im Bereich „Notes“ erfasst werden. Ist die Betrachtung des Dichtungssystems abgeschlossen, können die ermittelten Daten in ein PDF konvertiert werden.



O-Ring Selector







>>> Metrische Version starten
>>> Zöllige Version starten



Weitere Informationen:

Blig: O-Ring Auswahl leicht gemacht mit dem Parker O-Ring Selector

Blog: O-Ring-Werkstoffauswahl mit dem Parker O-Ring Selector



Ein Beitrag von

Heinz Christian Rost



Dr. Heinz-Christian Rost
Technology & Innovation Manager
Prädifa Technology Division



O-Ring Auswahl leicht gemacht mit dem Parker O-Ring Selector

O-Ring-Werkstoffauswahl mit dem Parker O-Ring Selector


O-Ring-Größen sicher berechnen mit dem Parker O-Ring Selector

Read More

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