1、 SURFACE VEHICLE STANDARD Nonmetallic Fuel System Tubing with One or More Layers SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suit
2、ability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copy
3、right 2004 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT O
4、RDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Issued 1996-11 Revised 2004-11 Superseding J2260 NOV1996 J2260 REV. NOV2004 1. Scope This SAE Standard presents the minimum requirements for nonm
5、etallic tubing with one or more layers manufactured for use as liquid-carrying or vapor-carrying component in fuel systems for gasoline, or alcohol blends with gasoline. Requirements in this document also apply to monowall tubing (one layer construction). When the construction has one or more layers
6、 of polymer-based compounds in the wall, the multilayer constructions are primarily for the purpose of improvement in permeation resistance to hydrocarbons found in various fuels. The tube construction can have a straight-wall configuration, a wall that is convoluted or corrugated, or a combination
7、of each. It may have an innermost layer with improved electrical conductivity for use where such a characteristic is desired. The improved electrical conductivity can apply to the entire wall construction, if the tubing is a monowall. (For elastomeric based MLT constructions, refer to SAE J30 and SA
8、E J2405). Unless otherwise agreed to by suppliers and users this document applies to tubing for any portion of the fuel system that might operate continuously at temperatures above -40 C and below 90 C and up to a maximum working gage pressure of 450kPa. The tubing can be used at the peak intermitte
9、nt temperature up to 115 C. This document can apply to systems that operate at higher pressures and/or are exposed to higher temperatures. For higher pressures, the acceptance criteria of section 7.2 must be correspondingly changed. For higher temperatures, the acceptance criteria of sections 7.2 an
10、d 7.14 remain the same, but apply at the higher temperature. The selection of higher temperatures and pressures that could be used for this document would be the decision of the end user and supplier of the specific fuel/fuel vapor system in question. There are three types of tubing covered by this
11、specification, based on the type of application for which the tubing is intended to be used: High pressure, liquid fuel line is tubing that handles liquid fuel at pressures up to 450 kPa pressure, and can handle the maximum pressure requirements identified in sections 7.1 and 7.2. These are typicall
12、y the smaller diameter tubes identified in Table A1. SAE J2260 Revised NOV2004 - 2 - Low pressure, liquid fuel line is tubing that is regularly exposed to liquid fuel, but is subjected to pressures that are under 50 kPa (e.g. fuel filler pipes). These are typically the larger diameters identified in
13、 Table A1. Fuel vapor tubing is tubing that handles fuel in vapor form or some liquid condensed from vapor, and operates at a working gauge pressure that does not exceed 20 kPa. In some cases, a distinction is made in the criteria that apply to tubing used to carry liquid fuel compared to tubing use
14、d to carry fuel vapor. These are identified separately in each section. 2. References 2.1 Applicable Publications The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE PUBLI
15、CATIONS Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J30Fuel and Oil Hoses (R11: Low Permeation Fuel Fill and Vent Hose and R12: Low Permeation Fuel Feed and Return Hose) SAE J1645Recommended Practice Covering Electrostatic Charge in Fuel Systems SAE J1681Gasoline, Alco
16、hol and Diesel Surrogates for Material Testing SAE J1737Recommended Practice for Measurement of Permeation Resistance by the Recirculation Technique SAE J1960Accelerated Exposure of Automotive Exterior Materials Using a Controlled Irradiance Water-Cooled Xenon-Arc Apparatus SAE J2027Standard for Pro
17、tective Covers for Gasoline Fuel Lines SAE J2044SAE Quick Connector Specifications for Liquid Fuel Systems SAE J2045Tube/Hose Assemblies SAE J2405Low Permeation Fuel Fill and Vent Tube (Elastomer Hose) SAE J2663Test Procedure to Measure Permeation of Elastomeric Hose by Reservoir Weight Loss Method
18、2.1.2 ISO PUBLICATIONS Available from ANSI, 25 West 43rd Street, New York, NY 10036-8002. ISO 527PlasticsDetermination of tensile properties ISO 4639-3Rubber tubing and hoses for fuel circuits for internal combustion engines specificationPart 3: Oxidized fuels SAE J2260 Revised NOV2004 - 3 - 2.2 Rel
19、ated Publications The following publications are for information purposes only and are not a required part of this document. 2.2.1 ASTM PUBLICATIONS Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM D 412Test Methods for Rubber Properties in Tension ASTM D 4000Classi
20、fication System for Specifying Plastic Materials ASTM D 4066Specification for Nylon Injection and Extrusion Materials 3. Installation, Assembly, and Handling Recommendation 3.1 End Fittings End fittings can be assembled to the tubing providing that they do not cause mechanical damage to the tubing t
21、hat results in decreased performance. Assemblies manufactured with tubing described in this document and end fittings must meet all of the requirements of SAE J2045. 3.2 Support and Routing When installed in a vehicle this tubing shall be routed and supported so as to: a. Prevent chafing, abrasion,
22、kinking, or other mechanical damage. b. Be protected against road hazards by installation in a protected location or by providing adequate shielding in vulnerable areas. c. Be protected from heat by proper clearance or the addition of insulation and/or heat shielding (refer to SAE J2027), for use in
23、 applications where temperatures exceed the upper limits of 115 C. 3.3 Handling Tubing ends should be protected during handling and storage to prevent internal contamination. 4. Construction Tubing shall consist of an extrudate of one or more layers within the body of the wall. The dimensions and to
24、lerances of the one or various layers shall be expressed in millimeters and the material name should be called out on the drawing. 4.1 Materials The requirements of this document apply to the tubing as a whole and not necessarily to the individual materials used in the construction of the tubing For
25、 monowall tubing, the material used must meet all applicable exposure criteria described in this document. SAE J2260 Revised NOV2004 - 4 - 4.1.1 OUTER LAYER If the tubing in question must be conductive (as described in section 7.9), the outer layer material should not be the one that has that charac
26、teristic. The only exception would be if the innermost layer were at least equally conductive and the two layers are bonded as defined in SAE J1645. Refer to 4.3 for comments on color. 4.1.2 INNER LAYER If tubing must be conductive as described in section 7.9, the innermost layer must have that char
27、acteristic. The materials used in the inner layer must be able to withstand contact with road chemicals. The inner layer of the tubing can be exposed to such an environment at the “ends“ that are attached to the various connection points in a fuel system. It is for this reason that the ends of the t
28、ubing are also exposed to the environmental stress crack resistance test in 7.12. 4.2 Regrind Tubing may be manufactured using regrind within the limits specified in this section and providing the tubing produced will meet all the performance requirements of this document. 4.2.1 REGRIND LIMITATIONS
29、4.2.1.1 Regrind of a specific resin can only be blended with identical virgin resin. 4.2.1.2 Regrind must be free from contamination from other resins or foreign matter except as allowed in 4.2.1.4. 4.2.1.3 Regrind from one layer of a multilayer tube must only be blended and used in the same layer.
30、4.2.1.4 Regrind created by grinding up a specific multilayer tube construction can only be used as a separate layer within a specific multilayer construction provided: 4.2.1.4.1 The multi-resin regrind layer is not the outer or inner layer of the tube wall. 4.2.1.4.2 The multi-resin regarding layer
31、thickness does not exceed 10% of the tube wall thickness. 4.2.2 REGRIND QUALIFICATION 4.2.2.1 Tubing whose wall or a layer in the wall is manufactured from regrind blends must meet all the requirements of this document. Qualification consists of demonstrating and documenting the capability of such t
32、ubing by passing all the test requirements of this document. 4.2.2.2 A single blend of regrind and virgin resin must be qualified. Once qualified, any blend of regrind less than the amount qualified may be used. Any blend of regrind greater than the amount qualified must be fully qualified separatel
33、y. SAE J2260 Revised NOV2004 - 5 - 4.2.2.3 A single construction of multilayer tubing in which one layer is regrind must be qualified. Once qualified, the thickness and position of the regrind layer is fixed but any blend of regrind less than the amount qualified may be used in the regrind layer. 4.
34、2.2.4 Qualification of a regrind/virgin resin blend applies only to the manufacturer who developed the regrind blend and tubing construction and obtained the qualification. 4.2.3 REGRIND GUIDELINES 4.2.3.1 If single resin regrind is used to produce monowall tubing or the inner or outer wall of multi
35、layer constructions the amount of regrind in the blend shall be limited to 10% max. 4.2.3.2 Use of regrind might have an effect on the long term capability of tubing to resist exposure to long term heat aging or zinc chloride. The end user should be consulted to determine if more aggressive testing
36、is necessary than listed in this document. 4.3 Color The outside layer of the tubing constructions is usually black although, alternative colors are permissible, if necessary, for purposes of color-coding. The following criteria must be met: a. The tubing color and the label color must be such that
37、there is sufficient contrast to achieve easy readability. b. Material used in outside layer of the MLT or as the material of the monowall tubing should be U.V. stabilized to withstand expected exposure (either with an additive or by the inherent characteristics of the material). Requirements necessa
38、ry to adequately resist sunlight exposure will depend strongly on the application. The end user must be consulted for specific standards to be met. As a general guideline, also refer to SAE J1960. 4.4 Identification 4.4.1 The following minimum information, in the order listed, is required. Additiona
39、l information and/or another lay line may be added: SAE J2260 L-D-Type-XX/YY-P. a. L refers to the construction of the tubing: (S for single layer and M for more than one layer) b. D refers to the reference size in mm from Tables A1 located in the Appendix. c. TYPE refers to the type of tube as indi
40、cated by two descriptions. 1. The first description (xx) refers to conductivity and has 2 options: C: This is a tubing that is conductive as defined by Section 7.9 N: This is a tubing that is non-conductive (the requirements of section 7.9 do not have to be met) 2. The second description is (YY) ref
41、ers to pressure application and has 3 options: HPF: This is a type of tubing described in the scope as high-pressure liquid fuel line. LPF: This is a type of tubing described in the scope as low-pressure liquid fuel line. V: This is a type of tubing described in the scope as one that handles fuel va
42、por or evaporative emissions. These two descriptions are included by printing them with a “slash” line separating them. Two examples of this “type” as printed on the tubing would be: C/HPF and N/V SAE J2260 Revised NOV2004 - 6 - d. P refers to the permeation category as determined by the procedures
43、described in 7.10. It shall be a single digit that is identified from 7.10.5. If it is not practical to print on the outside of the tubing (convoluted tubing or tubing with an outside surface that is not smooth, for example), then the labeling will be done by a tag or loop of tape permanently attach
44、ed to the outside circumference of the tubing. Such labeling must be repeated every 500 mm or less along the entire length. For convoluted or corrugated tubing, the necessary printing can be done by the labeling or tagging procedure that is described. An acceptable alternative is to print the necess
45、ary wording only on each straight end section. 4.4.2 EXAMPLES OF IDENTIFICATION The following are examples of appropriate identification of a tubing a. SAE J2260 M-8-C/HPF-2: This is a multilayer tubing construction with an 8mm nominal O.D. It is conductive and is targeted toward a high pressure liq
46、uid fuel application; permeation category is 2. b. SAE J2260 M-28-C/LPF-1: This is a multilayer tubing construction with a 28mm nominal O.D. It is conductive and is targeted toward a low-pressure liquid fuel application; permeation category is 1. c. SAE J2260 S-14-N/V-4: This is a monowall tubing wi
47、th a 14mm nominal O.D. It is non-conductive and is targeted toward a fuel vapor application; permeation category is 4. 5. Dimensions 5.1 Tubing Sizes and Dimensions 5.1.1 DIAMETERS Tubing diameters refer to outside diameter (O.D.); standard sizes and their tolerances are listed in Tables A1 and A2 i
48、n the Appendix. 5.1.2 WALL THICKNESS There are numerous factors that can have an influence on the wall thickness that is selected; for example: a. The burst pressure of a given tube construction and diameter is a function of its wall thickness. b. As walls become thicker, the minimum bend radius inc
49、reases for a given tube diameter (for a free-form bend). c. For MLT constructions with elastomeric covers, the critical dimension is the ID. The wall thickness is determined by the materials utilized and the requirements of the application d. Tubing wall thickness may differ for convoluted/corrugated wall (refer to Section 6.3) The result of all these factors is that the end user must be consulted to determine all requirements. The wall thickness is then determined by those requirements and the materials selected for the various layers of the m
