Hose + Coupling World December 2021 Sample - Page 27

TECHNICAL ARTICLE and 100R19 . Each of these sub-standards describes a specific type of hydraulic hose for a given application . For example , different standards apply to hydraulic hoses with a one-wire braid reinforced construction , two-wire braid reinforced construction , or a four-wire spiral construction . Pressure classes for many of the sub-standards vary by hose size , as the traditional SAE standards do not generally apply to hydraulic hoses capable of handling constant working pressures across sizes .
Hoses rated to SAE standards meet specified dimensional and performance criteria as determined by SAE , ensuring similarity between products from different participating manufacturers aligned to SAE standards . Likewise , hoses rated to different regional standards or older ISO standards specify different criteria related to construction and performance that hoses must meet . over-complicated because of the vast number of sub-standards associated with the J517 standard for hydraulic hose . A separate issue that arises when equipment designers use certain regional or manufacturer-based standards , such as SAE , is that it is difficult to switch hoses from one region to another , where a different prevailing hydraulic hose standard may be the norm .
While standards and specifications differ between regions , their purpose is universal : provide products that ensure quality and performance for their designated application . Machines and equipment sold locally are expected to conform to locally accepted standards . Not only does this ensure availability of the correct replacement parts , it also guarantees that customers are receiving equipment made to the quality and performance specifications required by their application and promised by their manufacturer .
Limitations and Concerns While the SAE sub-standards have been useful for defining hydraulic hose pressure classes , sizes , and constructions , traditional hydraulic industry standards are unable to maintain relevance when competing with new , updated standards for many OEMs and customers on the global scale . The legacy standards define varying pressure ranges for each size . That means the smaller diameter hoses are generally made to handle higher pressures , while larger diameter hoses are built for lower pressures within the same product family .
The vast range of products and applications makes specification and product selection complex , especially considering most applications have systems operating at a single pressure , and designers may need hoses with different diameters that are capable of handling the same pressures . With traditional standards such as the SAE 100R1 and 100R2 , the pressure rating , degrades as hose diameters increase .
In addition to construction types , traditional SAE and ISO standards also require products to withstand defined temperature ranges . However , with the wide range of hose styles and applications on the market , the temperature criteria vary by substandard , with maximum working temperatures ranging from 212 ° F ( 100 ° C ) to 257 ° F ( 125 ° C ).
While SAE standards have evolved over the years to cover different hose styles and applications , sorting through the different criteria and specifications can be confusing and
However , if a piece of equipment is manufactured in a different geographic region , and thus aligned to a different hose standard , it will be difficult for the manufacturer to find the same parts locally . For instance , U . S . -based manufacturers may specify hoses with the SAE standard , while European counterparts are using the EN standard to select their hoses . That means that not only will finding an exact product match be difficult between regions , but there will be differences between the hydraulic hoses manufactured in each area , and the different regional specs will have different qualifications .
The Global ISO 18752 Standard The newer ISO 18752 standard for hydraulic hoses solves many of the issues concerning pressure classes , hose sizes , and product uniformity in different regions . Introduced in 2006 , ISO 18752 centers around 10 maximum working pressure classes , ranging from 500 psi to 8,000 psi .
With the introduction of this standard , ISO is helping large global OEMs and their customers to apply the same specifications to their systems , no matter where in the world they are made or sold . That means manufacturers can be assured of receiving the same hydraulic hoses , tested to the same specifications , to meet the needs of their applications globally .
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