This SAE Standard provides general, dimensional and performance specifications for the most common hoses used in hydraulic systems on mobile and stationary equipment. The rated working pressure of a hose assembly comprising SAE J hose and hose fitting end connections per SAE. The maximum working pressure of a hose assembly comprising SAE J hose and hose connectors per SAE J, SAE J, SAE J, etc., shall not exceed the lower of the respective SAE maximum working pressure values. When using SAE J hose for marine applications, see SAE J SAE J Hydraulic Hose - Commonwealth Drive, Warrendale, to investigate the possibility of applying the most recent edition of the document .. - 8- SAE J Revised APR TABLE 3—DIMENSIONS AND.
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Hydraulic Hoses Standards - Free download as PDF File .pdf), Text File .txt) or read online for free. SAE Specifications for Hydraulic Hoses. SAE HYDRAULIC HOSE SPECIFICATIONS (SAE J). General. Hydraulic hose has a finite service life, which can be reduced by many factors including. SAE J standard high pressure hose pipe with stainless Committee: AE-1 Engine SAE MOBILUS Subscribers can view annotate, and download all of SAE's.
Assemblies, which have been subjected to this test, shall be destroyed. Reduce the fluid pressure to 0 MPa. Reject assemblies showing leakage or failure. Surface moisture shall be removed prior to testing.
Conditioned assemblies shall have one end fitting attached to the lead from a source of 60 Hz sinusoidal, This lead shall be suspended by dry fabric strings so that the hose hangs free, at least mm from any extraneous objects.
A suitable AC voltmeter shall be connected across the resistor, using a fully shielded cable with the shielding well grounded. Thirty-seven and one-half kV shall be applied to the specimen for 5 min and a current reading taken.
This current shall not exceed the value specified. The inner surface of the tube shall be cleaned, first with naphtha dry cleaning fluid or Stoddard solvent, and then with isopropyl alcohol to remove surface contamination, followed by thorough drying at room temperature. The specimen shall be mounted in a vertical position as shown in Figure 4.
The adapter at the base is simply a convenient means of assuring proper electrical contact if a swivel female fitting is chosen, and may be omitted if a male fitting is used. In either case, the electrode must be insulated from ground. A mercury or salt water solution electrode shall be provided at the upper end as shown, by inserting a nonmetallic plug with an O-ring seal to a distance of 75 mm from the end of the tubing, thus providing an average test length of mm.
Mercury or salt water solution shall then be added to a level 25 mm above the plug.
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Any suitable conductor to this electrode may be used, including a threaded end attached to the plug if so desired. Covers are made from synthetic rubber, fiber braids, or a fabric wrap, depending on the application.
Very-high and extremely high-pressure hose is used in off-highway equipment and heavy-duty machinery subject to extreme impulse or pressure surges. These hoses are reinforced with spiraled, high-tensile steel wire wound over the tube in alternating, even-numbered layers to balance pressure and containment forces. Most spiral hose with an ID of 1 in. Spiral reinforcement is particularly suited to high-pressure impulse applications because individual wires in each layer are parallel, and thin rubber-adhesion layers separate adjacent reinforcement layers and keep the wires from cutting one another.
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Spiral construction packs the reinforcement tighter around the tube than does braid reinforcement and, therefore, provides more support. Individual ends or strands can be bound tightly together as opposed to the over-under gaps with braiding.
However, braided hose is generally more flexible than spiral hose. It is frequently used on construction equipment and similar applications.
ID to 1, psi for 2-in. Medium-pressure hoses handle hydraulic applications requiring operating pressures of to 3, psi. In addition to medium-pressure hydraulic equipment, these hoses are often used in heavy-duty truck and fleet applications. In the early s, there were no flexible hoses on the market specifically for fleet users.
Truck mechanics turned to aircraft hydraulic hose and applied it to fleet applications.
Soon the hose replaced rigid copper tubing originally used on trucks. Low-pressure hydraulic hoses withstand operating pressures up to psi. Reinforcement is usually textile. They are found on low-pressure hydraulic applications and transmit petroleum-based fluids, diesel fuel, hot lubricating oil, air, glycol antifreeze, and water. Specialty hydraulic hoses do not fit well into a particular pressure category.
sae standard hydraulics hoses large inside diameter
For example, specialty hose might be used in applications such as conveying refrigerant, environmentally friendly hydraulic fluids, or LPG gas, operating at extremely high or low temperature, or requiring electrical nonconductivity. They may be specified where weight is a concern or long continuous lengths are required. Reinforcement is generally nonmetallic — usually a rubber-impregnated fabric. SAE hose constructions To bring a measure of uniformity to hydraulic-hose manufacturing, minimum standards for construction, dimensions, and performance have long been established in North America by SAE.
Governmental agencies also set standards.
SAE Standard J provides general, dimensional, and performance specs for the R hose series, which are the most common hoses used in hydraulic systems.
Manufacturing-process changes—New crimping processes, along with extrusion, can affect hose performance. Application changes—These include any environmental changes that may affect the product, such as changes in fluid used, pressure changes, and temperature changes. Construction and design flaws—Examples of these flaws are unsuitable crimping practices and bending hose to a smaller-than-recommended bend radius. Improper assembly—Hoses and connectors may not have been specified for use together, or required fittings and clamps are not being used.
Incompatible environment—Pinching or rubbing during operation can cause a hose to fail from erosive wear. These evaluations focus on environmental concerns and how hose assemblies will perform under different types of stress. Tests can come from manufacturers that maintain internal controls as well as distributors that have standards for the hoses they are marketing.
Crucial tests include: Dimensional checks—Each hose needs to conform to the dimensions specified for its respective R-series hose type. This is considered a quality check for post-production validation. Burst test—This test features a constant increase in pressure inside a hose assembly until failure occurs. It determines the safety factor ratio of the product—a minimum of four times the MAWP is required to pass.
Cold bend—The cold-bend test soaks the hose assembly in a low-temperature fluid, after which the hose is flexed to the minimum bend radius.
The hose cannot leak or fail at the leakage pressure stipulated in SAE J for that type and size of hose. Oil resistance—Studies are performed to confirm that the hose and the materials the hose is made from can withstand prolonged exposure to the hydraulic fluid being used. Electrical conductivity—Hoses and assemblies are checked for electrical resistivity and conductivity, which is a safety concern in many applications.Assemblies which have been subjected to this test shall be destroyed.
Calculate the free exposed length of hose und er test, shown on Figure 1, as follows: a. It is frequently used on construction equipment and similar applications.
Avoid con- tact with escaping fluids. Analyze this motion when designing hose systems.
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