1.1 Purpose SAE J2551-3 recommended practice provides recommendations for a procurement process for carbon, alloy and high strength low alloy steel tube assemblies for fluid power applications utilizing commonly available manufacturing methods and general guidelines for tube selection and application. 1.2 Field of Application These recommended practices are intended for general application and hydraulic systems on industrial equipment and commercial products. Aircraft and Aerospace applications were not considered during the preparation of this document. Since many factors influence the pressure at which a hydraulic system does or does not perform satisfactorily, these recommended practices should not be construed as guaranteed minimums. For any application, it is recommended that sufficient testing be conducted and reviewed by both the user and supplier to ensure that required performance levels are met. For use of these recommended practices and connectors in conditions outside the pressure and temperature of limits specified, the fabricator must be consulted. Both metric and inch tubing should be considered to accommodate hydraulic system design requirements. In the past, these requirements have been met predominantly with inch tubing; for new designs, metric tubing should be considered.
Modifications are necessary to correct/improve the language of the document to clarify the intent of many sections. Richard Gast of John Deere proposed many grammatical suggestions in 2011. Many of these suggestions will be incorporated.