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SAE J517 Interpretation of hydraulic hoses and applications (Processing & application direction)

shoton hose and fittings

Scope

SAE J517 standard is an industry-standard that defines the requirements and test methods for hydraulic hoses. This standard covers various types of hydraulic hoses, including high-pressure, medium-pressure, and low-pressure hoses. It also specifies requirements for hose size, materials, performance, and marking to ensure that hoses can operate safely and reliably in a variety of industrial applications.

THE SAE J517 standard was developed by the American Society of Motor Vehicle Engineers (SAE) and has become one of the key reference standards for the global hydraulic hose industry. Its main purpose is to ensure the safety and performance of hydraulic systems and to improve the reliability and efficiency of hydraulic equipment.

Definition of hydraulic hoses

  • Hose size and size tolerance: the standard specifies the hose’s inner diameter, outer diameter and minimum bending radius, and other size parameters, as well as the corresponding size tolerance.
  • Hose material: The standard specifies the material type and performance requirements of the hose, including tube body material, cover material, reinforcement layer material, etc.
  • The working pressure level of the hose: the standard will be divided into several categories of hose according to its maximum working pressure level, and provide the working pressure range and test pressure of each category.
  • The use environment and working temperature of the hose: the standard specifies the use environment and working temperature range of the hose, as well as the performance requirements of the hose at different temperatures.
  • Hose marking: The standard specifies the requirements of hose marking, including the content, location, and manner of marking.
  • Hose testing and verification: The standard specifies hydraulic hose testing and verification methods, including compressive strength, burst pressure, twisting fatigue, and impact testing.

Lifetime control

  • The use of the hose environment: the use of the hose environment has an important impact on its life. For example, if the hose is in a high temperature, low temperature, moisture, or corrosive environment, its life may be limited.
  • The working pressure and pressure pulsation of the hose: the working pressure and pressure pulsation of the hose also has a significant impact on its life. The life of the hose will generally decrease with the increase in working pressure and pressure pulsation.
  • Hose radius of curvature and the number of bends: hose radius of curvature and the number of bends on its life also have a great impact. If the radius of curvature of the hose is less than the specified value, or the hose is often bent, its life will be affected.
  • Hose material and design: hose material and design will also affect its life. For example, the hose reinforcement layer material, tube body material, cover material, etc., as well as the design parameters of the hose such as size, wall thickness, etc., will affect its life.
  • The way the hose is used and maintained: the way the hose is used and maintained also has a great impact on its life. For example, the correct installation, use, and maintenance of the hose can extend its life, while the wrong use and maintenance will shorten its life.

Hose connector

  • Connector type and size: The standard specifies the type and size range of hydraulic hose connectors, including threaded connectors, flange connectors, quick connectors, etc.
  • Connector materials and manufacturing processes: The standard specifies the material and manufacturing process requirements for hydraulic hose connectors, including connector material, heat treatment, and surface treatment.
  • Connector installation and disassembly: The standard specifies the installation and disassembly of the hydraulic hose connector, including the tightening torque of the connector, the installation position, the connector sealing surface cleaning, and coating, etc.
  • Connector testing and verification: The standard specifies the hydraulic hose connector testing and verification methods, including connector pressure test, size inspection, sealing test, etc.
  • Connector identification: The standard specifies the requirements of the hydraulic hose connector identification, including the content, location, and manner of identification.
  • The scope of application of the connector: The standard specifies the scope of application and limitations of the hydraulic hose connector, including the maximum working pressure of the connector, the use of the environment and temperature, etc.

Hose assembly

  • Identification of the hose: The hose must be marked with the model number, size, pressure, and other important parameters.
  • Construction of the hose assembly: The hose assembly consists of the hose, connectors, fittings, and other accessories.
  • Material of the hose assembly: The material of the hose assembly must meet the standard requirements and undergo appropriate heat treatment and surface treatment.
  • Dimensions and tolerances of the hose assembly: The dimensions and tolerances of the hose assembly must conform to the standard requirements.
  • Test of hose assembly: The hose assembly must undergo the corresponding tests, including pressure resistance tests, rupture pressure tests, pulsation pressure tests, etc.
  • Installation of the hose assembly: The installation of the hose assembly must meet the standard requirements, including the cross-sectional shape of the hose, the selection of connectors, the fixing and bending radius of the hose, etc.
  • Maintenance of the hose assembly: The hose assembly must be maintained regularly, including cleaning, inspection, and replacement of the hose.
  • Identification of the hose assembly: the hose assembly must be marked with the model number, production date, lot number, and other important information.

In short, the standard requires that the design, materials, manufacturing, testing, installation, and maintenance of the hose assembly must meet the specification requirements to ensure the quality and safety performance of the hose assembly.

Hose assembly application factors

  • Temperature: The hose assembly should be able to work normally within the minimum and maximum temperature range specified in the standard, while also considering such issues as aging of the hose assembly at high temperatures and brittleness at low temperatures.
  • Pressure: The hose assembly shall be able to withstand the maximum working pressure specified in the standard, while factors such as instantaneous peak pressure and pulsating pressure shall also be considered.
  • Liquid media: The hose assembly shall be suitable for the liquid media specified in the standard, such as mineral oil, synthetic oil, water, air, etc.
  • Nature of liquid medium: The hose assembly should be applicable to the physical and chemical properties of the liquid medium, such as viscosity, density, acidity, alkalinity, etc.
  • Environmental factors: The hose assembly shall be applicable to the environmental factors specified in the standard, such as climatic conditions, the influence of chemical substances, radiation, etc.
  • Usage: The hose assembly shall be applicable to the usage modes specified in the standard, such as static or dynamic, one-way or two-way, cyclic or continuous, etc.

In summary, the adaptation factors of the hose assembly mainly involve temperature, pressure, medium, environment, user mode, and other aspects, and also need to consider the compatibility and interchangeability of the hose assembly with other parts of the equipment.

Hose size

  • Inner diameter: The standard specifies the range of inner diameter of hydraulic hoses, usually expressed in inches or millimeters.
  • Outside diameter: The standard specifies the outside diameter range of the hydraulic hose, usually expressed in inches or millimeters.
  • Wall thickness: the standard specifies the range of wall thickness of hydraulic hose, usually expressed in inches or millimeters.
  • Tolerance: The standard specifies the tolerance range of the inner diameter, outer diameter, and wall thickness of the hydraulic hose to ensure the dimensional accuracy and consistency of the hose.
  • Bending radius: The standard specifies the range of bending radius of the hydraulic hose to ensure that the hose will not break or permanently deform when bending.
  • Length: The standard specifies the length range of hydraulic hoses, which is usually expressed in feet or meters.

In short, the standard specifies the dimensions of hydraulic hoses in great detail, including inner diameter, outer diameter, wall thickness, tolerance, bending radius, and length to ensure the dimensional accuracy, consistency, and reliability of hydraulic hoses.

Hose Identification

  • Marking: The hydraulic hose should be marked on its external surface with the following information: manufacturer’s logo, hose inner diameter, pressure rating, standard model number, batch number, production date, etc.
  • Marking color: Hydraulic hose should be marked on its surface with different color stripes, circles, or other marks to indicate its pressure level and application areas and other information to facilitate user identification and selection.
  • Temperature range: hydraulic hose should be marked on its external surface with its applicable temperature range to help users choose the appropriate hose.
  • Use: Hydraulic hose should be marked on its external surface with its applicable type of liquid medium, and whether it is suitable for special purposes, such as suction hose, oil discharge hose, cooling water hose, etc.

In short, the SAE J517 standard requires hydraulic hose must be marked on its external surface with a variety of information, including the manufacturer’s logo, inside diameter, pressure rating, standard model, lot number, production date, logo color, temperature range, and use, etc., to ensure that users can properly select and use the hose.

Orientation of the offset elbow in the hose assembly

SAE J517 standard states that when using offset elbows in hydraulic hose assemblies, the offset direction of the elbow should be the same as the axis of the hose bore to ensure that the hose can withstand the correct bending stress and maintain good performance and life.

Specifically, the offset elbow should be rotated on the axis of the hose bore to the maximum bending angle, and align the offset surface with the axis of the hose bore. The angle and orientation of the offset elbow should be determined at the time of hose manufacture to ensure that the hose does not twist or twist excessively during use, thereby reducing the life and performance of the hose.

In short, the SAE J517 standard for hydraulic hose components in the offset elbow direction is relatively strict, designed to ensure that the hose can withstand the correct bending stress, as well as to maintain good performance and life.

Length of hose assembly

  • Overall length: The length of the hydraulic hose assembly should be determined according to the actual application, and should not exceed three times its minimum bending radius. At the same time, the length of the assembly should fully consider the vibration and expansion of the hydraulic system and other factors to avoid excessive stretching or compression of the hose during use, thus reducing its performance and life.
  • Bending radius: hydraulic hose assembly in bending, should follow its minimum bending radius regulations. At the same time, the bending radius of the hose assembly should also be determined according to the actual application, taking into account the vibration and expansion of the hydraulic system and other factors.
  • Installation position: The installation position of the hydraulic hose assembly should be such that it is not affected by external physical damage or environmental factors during use. The installation location of the hose assembly should take full account of factors such as its length and bend radius, and follow the manufacturer’s recommendations and regulations.

In short, the SAE J517 standard on the length of the hydraulic hose assembly has provisions, the length of the assembly should be based on the actual application to determine, should not exceed three times its minimum bending radius, and give full consideration to factors such as vibration and expansion of the hydraulic system. At the same time, the bending radius and installation position of the hose assembly should also be determined according to the actual application, and follow the manufacturer’s recommendations and regulations.

Test

  • Appearance inspection: Check the surface of the hydraulic hose for defects such as breakage, corrosion, deformation, etc., and whether the logo is clear and accurate.
  • Inner diameter size: Measure the inner diameter size of the hydraulic hose to ensure that it conforms to the specified range.
  • Outer diameter size: Measure the outer diameter size of the hydraulic hose to ensure that it is within the specified range.
  • Bursting pressure test: Under the specified temperature, pressurize the hydraulic hose until it bursts and measure its bursting pressure to evaluate its pressure resistance performance.
  • Abrasion resistance test: The hydraulic hoses are subjected to an abrasion test under specified conditions to evaluate their abrasion resistance performance.
  • Heat resistance test: The hydraulic hose is subjected to a heat aging test under the specified temperature to evaluate its heat resistance performance.
  • Oil resistance test: Soak the hydraulic hose in the specified oil for a certain period of time and measure the dimensional change, weight change, and appearance change to evaluate its oil resistance performance.
  • Corrosion resistance test: soak the hydraulic hose in the specified corrosive solution for a certain period of time and measure the dimensional change, weight change, and appearance change to evaluate its corrosion resistance.

In summary, the quality test of hydraulic hoses specified in the SAE J517 standard includes the main aspects such as appearance inspection, dimensional measurement, burst pressure test, abrasion resistance test, heat resistance test, oil resistance test, and corrosion resistance test to evaluate the quality and performance of hydraulic hoses.

Inspection of samples

  • The number of samples: The standard requires a certain number of samples to be randomly selected for inspection to ensure the accuracy and reliability of the test results.
  • Storage and handling of samples: The samples should be stored under the conditions specified in the standard to avoid unnecessary influence and damage to ensure the accuracy of the test results.
  • Items to be inspected: The standard specifies the items to be inspected in various aspects such as appearance, size, marking, and pressure of the hydraulic hose samples to assess whether their quality and performance meet the standard requirements.
  • Inspection methods and requirements: The standard specifies the methods and requirements for the inspection of hydraulic hose samples, such as appearance inspection requires checking whether the surface of the hydraulic hose is damaged, corroded, deformed, or other defects, as well as whether the logo is clear and accurate; dimensional measurement requires the use of accurate measuring tools and methods, etc.
  • Records and reports of inspection results: The standard requires records and reports of inspection results, including information such as inspection items, inspection results, and inspection dates.

In short, the SAE J517 standards for sample inspection requirements are very strict, covering the number of hydraulic hose samples, storage and handling, inspection items, inspection methods, and requirements, the record and report of inspection results, and other aspects to ensure the accuracy and reliability of test results.

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