1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 331A Strainers for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations Up to 85 Percent (E0 E85)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRI
2、BUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Strainers for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 E85), UL 331A First Editi
3、on, Dated February 6, 2015 Summary of Topics This is the rst edition of the Standard for Strainers for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 E85), ANSI/UL 331A. The requirements are substantially in accordance with Proposal(s) on this subject d
4、ated October 17, 2014. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warra
5、nty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data,
6、or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form
7、of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser
8、 is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. T
9、he prior text for requirements that have been revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. FEBRUARY 6, 2015 UL 331A tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMIS
10、SION FROM UL FEBRUARY 6, 2015 UL 331A tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 6, 2015 1 UL 331A Standard for Strainers for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up t
11、o 85 Percent (E0 - E85) Prior to the rst edition, the requirements for the products covered by this standard were included in the Outline of Investigation for Strainers for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85 Percent (E0 E85), UL 331A. First Edition Febr
12、uary 6, 2015 This ANSI/UL Standard for Safety consists of the First Edition. The most recent designation of ANSI/UL 331A as an American National Standard (ANSI) occurred on February 6, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective dat
13、e information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither
14、a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 331A-2015UL COPYRIGHTED MATERI
15、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 6, 2015 UL 331A 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Components 5 3 Units of M
16、easurement .5 4 Undated References 5 CONSTRUCTION 5 General 5 6 Materials .6 6.1 Metallic materials .6 6.2 Nonmetallic materials .9 6.3 Casting impregnation materials 11 7 Bodies and Covers .11 8 Stuffing Boxes .12 9 Springs .12 PERFORMANCE 10 General 13 11 Long Term Exposure Test .14 11.1 General .
17、14 11.2 Samples 14 11.3 Method .15 11.4 Results .15 12 Deformation and External-Leakage Test .16 13 Hydrostatic-Strength Test 17 14 Element-Collapse Test 17 15 10-Day Moist Ammonia-Air Stress Cracking Test .17 MANUFACTURING AND PRODUCTION 16 General 18 MARKING 17 General 18 SUPPLEMENT SA - Test Flui
18、ds SA.1 Details .SA1 FEBRUARY 6, 2015 UL 331A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover complete, self-contained strainer or lter assemblies intended for use with fuels designated in 1
19、.2. Although these devices are designated strainers, they may be either strainers or lters according to the common terminology of the industry. 1.2 Strainers and lter assemblies covered by these requirements are intended for use with one or more of the following: a) Gasoline formulated in accordance
20、 with the Standard Specication for Automotive Spark Ignition Fuel, ANSI/ASTM D4814; b) Gasoline/ethanol blends with nominal ethanol concentrations up to 25 percent ethanol (E25), consisting of gasoline formulated in accordance with the Standard Specication for Automotive Spark Ignition Fuel, ANSI/AS
21、TM D4814, when blended with denatured fuel ethanol formulated to be consistent with the Standard Specication for Denatured Fuel Ethanol for Blending With Gasolines For Use as Automotive Spark Ignition Engine Fuel, ANSI/ASTM D4806; or c) Gasoline/ethanol blends with nominal ethanol concentrations abo
22、ve 25 percent formulated in accordance with the Standard Specication for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark Ignition Engines, ANSI/ASTM D5798. 1.3 These requirements do not cover: a) Strainers for handling liquids under cryogenic conditions; b) Strainers for marine use; c) Strain
23、ers for automotive fuel lines; d) Strainers for handling refrigerants; e) Strainers for use in such facilities as chemical, petrochemical, petroleum, and utility power plants; f) Strainers for use in uid-power (hydraulic and pneumatic) applications; g) Strainers or lter assemblies for use with diese
24、l, biodiesel, diesel/biodiesel blends, fuel oil, or kerosene which are covered under the Outline of Investigation for Strainers for Diesel Fuel, Biodiesel Fuel, Diesel/Biodiesel Blends With Nominal Biodiesel Concentrations Up To 20 Percent (B20), Kerosene, and Fuel Oil, UL 331B. h) Strainers or lter
25、 assemblies for use with LP-Gas, Natural Gas, Manufactured Gas, and Anhydrous Ammonia, which are covered under the Standard for Strainers for Flammable Fluids and Anhydrous Ammonia, UL 331. FEBRUARY 6, 2015 UL 331A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITH
26、OUT PERMISSION FROM UL 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required
27、in the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction feature
28、s or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 3 Units of Measurement 3.1 If a value for measurement is followed by a val
29、ue in other units in parentheses, the rst stated value is the requirement. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 5 General 5.1
30、A strainer shall include all of the components necessary for its intended function and installation, and shall be furnished as a complete assembly. Strainers may be one of two types: a) Removable assemblies, or b) Non-removable assemblies with removable strainer elements. In this standard, the term
31、strainer applies to both types, and requirements that apply to a specic type will designate that type in the text of the requirement. 5.2 The construction of a strainer shall be such that parts can be reassembled in the intended manner after being dismantled to the extent needed for servicing. FEBRU
32、ARY 6, 2015 UL 331A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.3 A strainer shall be constructed so that, when in its intended operating position, any air trapped within will not reduce the rate of liquid ow or the effective strainer
33、 element capacity. 5.4 A non-removable strainer employing a strainer element intended to be cleaned or replaced shall permit the removal of the element without disconnecting piping. 5.5 A strainer element shall be constructed so that joints or seals required to prevent uid bypass of the element will
34、 be maintained. 5.6 A non-removable strainer shall be constructed so that, when the screen or lter element is removed for cleaning, all foreign matter (sediment and dirt) will be removed or can be removed without the probability of any foreign matter being deposited in the outlet side of the straine
35、r. 6 Materials 6.1 Metallic materials 6.1.1 General 6.1.1.1 A metallic part, in contact with the fuels anticipated by these requirements, shall be resistant to the action of the fuel if degradation of the material will result in leakage of the fuel or if it will impair the function of the device. Fo
36、r non-removable strainer assemblies for all fuel ratings covered by this standard, see Corrosion due to uid, 6.1.2.1. For non-removable strainer assemblies rated for gasoline/ethanol blends with nominal ethanol concentrations greater than 25 percent, see Metallic materials system level, 6.1.3. For r
37、emovable strainer assemblies, the requirements in 6.1.2.1 and 6.1.3 do not apply. 6.1.1.2 The exposed surfaces of metallic parts shall be resistant to atmospheric corrosion if this corrosion will lead to leakage of the uid or if it will impair the function of the device. The material shall comply wi
38、th the requirements in Atmospheric corrosion, 6.1.2.2. 6.1.1.3 Metallic parts in contact with the fuels anticipated by these requirements shall not be constructed of lead, or materials that are substantially lead. In addition, no coatings or platings containing lead shall be used, such as terne-plat
39、ed steel. 6.1.1.4 A wire-cloth element, if ner than 60 mesh, shall be resistant to corrosion. A 60-mesh or coarser element shall be resistant to the uid it is intended to contact. FEBRUARY 6, 2015 UL 331A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMIS
40、SION FROM UL 6.1.2 Metallic materials material level 6.1.2.1 Corrosion due to uid 6.1.2.1.1 All metallic materials used for uid conning parts of non-removable strainer assemblies shall be resistant to corrosion caused by the fuels anticipated by these requirements. Compliance is veried by the Long T
41、erm Exposure Test, Section 11. 6.1.2.1.2 A coating or plating, applied to a base metal, shall be resistant to the action of the fuels anticipated by these requirements as determined by the Long Term Exposure Test, Section 11. 6.1.2.2 Atmospheric corrosion 6.1.2.2.1 Metallic materials used for uid co
42、nning parts shall be resistant to atmospheric corrosion. Ferrous materials of the thickness specied in the following items are acceptable for the preceding when uncoated: a) A casting having a wall thickness of not less than inch (6.4 mm) if shown by production test to be free of leakage, b) Fabrica
43、ted sheet steel parts having a minimum wall thickness of 0.093 inches (2.36 mm). 6.1.2.2.2 A protective coating shall provide resistance against atmospheric corrosion to a degree not less than that provided by the protective coatings specied in 6.1.2.2.3. 6.1.2.2.3 Cadmium plating shall not be less
44、than 0.0003 inch (0.008 mm) thick, and zinc plating shall not be less than 0.0005 inch (0.013 mm) thick, except on parts where threads constitute the major portion of the area, in which case the cadmium or zinc plating shall not be less than 0.00015 inch (0.0038 mm) thick. Metallic parts are also co
45、nsidered to comply with 6.1.2.2.1 when they are protected against atmospheric corrosion by: a) Hot dipped, mill galvanized sheet steel complying with the coating designation G90 in Table I of the Specication for Sheet Steel, Zinc Coated (Galvanized) or Zinc-Iron-Alloy Coated (Galvannealed) by the Ho
46、t Dip Process, ASTM A653/A653M, or b) Coatings which have been determined to be equivalent to G90 under the requirements of the Standard for Organic Coatings for Steel Enclosures for Outdoor Use Electrical Equipment, UL 1332. 6.1.2.2.4 A metallic material other than as described in 6.1.2.2.1 6.1.2.2
47、.3 shall be painted or protected in a manner that has been determined to be equivalent. FEBRUARY 6, 2015 UL 331A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.1.3 Metallic materials system level 6.1.3.1 Combinations of metallic material
48、s in non-removable strainer assemblies rated for use with gasoline/ethanol blends with nominal ethanol concentrations greater than 25 percent shall be chosen to reduce degradation due to galvanic corrosion in accordance with 6.1.3.2 6.1.3.4. 6.1.3.2 Table 6.1 shows the galvanic series for metallic m
49、aterials exposed to a conductive solution of sea water. The most active material in a given combination will experience increased levels of corrosion, while the most passive material in the combination will experience reduced levels of corrosion. The greater the separation of the materials in the galvanic series of Table 6.1, the more pronounced the effects would be. Table 6.1 serves as a guide in selecting the appropriate test conditions based on manufacturer specied material combi
