1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 1978 Grease Ducts STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURT
2、HER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Grease Ducts, UL 1978 Fourth Edition, Dated December 13, 2010 Summary of Topics This revision of ANSI/UL 1978 is being issued to update the title page to reect reaffirmation of ANSI approval. Text that has been ch
3、anged in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The requirements are substantially in accordance with Proposal(s) on this subject dated February 24, 2017. All rights reserved. No part of this publication may be reproduced, stored in a
4、 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 warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of
5、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, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an
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8、ture effective dates with the corresponding reference. APRIL 28, 2017 UL 1978 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Future Effective Date Reference September 19, 2014 Paragraph(s) 23.3 APRIL 28, 2017 UL 1978 tr2UL COPYRIGHTED MA
9、TERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 13, 2010 (Title Page Reprinted: April 28, 2017) 1 UL 1978 Standard for Grease Ducts First Edition March, 1995 Second Edition June, 2002 Third Edition January, 2005 Fourth Edition December 13, 2010 This
10、 ANSI/UL Standard for Safety consists of the Fourth Edition including revisions through April 28, 2017. The most recent designation of ANSI/UL 1978 as a Reaffirmed American National Standard (ANS) occurred on April 28, 2017. ANSI approval for a standard does not include the Cover Page, Transmittal P
11、ages, and Title Page. 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 https:/. ULs Standards for Safety are copyrighted by UL.
12、Neither 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 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 1978-2013 (R2017)UL CO
13、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 13, 2010 GREASE DUCTS - UL 1978 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scop
14、e .5 2 Components .5 3 Units of Measurement .6 4 Undated References 6 5 Terminology 6 6 Glossary 6 CONSTRUCTION 7 Materials .7 8 Assembly 8 9 Joints .9 10 Support Assembly .9 PERFORMANCE 11 General 10 12 Test Installations 11 13 Temperature Measurement .16 14 Temperature Test 500F (260C) Flue Gases
15、19 15 Abnormal Temperature Test 20 16 Leakage Test .20 17 Vertical Support Test 22 18 Strength Tests 22 18.1 General .22 18.2 Impact test .22 18.3 Longitudinal force test .24 18.4 Load test for grease duct elbows 24 18.5 Grease duct joint load test .25 18.6 Grease duct joint torsion test .26 19 Fire
16、 And Leakage Test Of Grease Duct Access Doors and Fittings .26 20 Pressure Tests For Fittings Exposed To Fire Extinguishing System Pressure .27 21 Tensile Strength, Elongation, And Change In Volume Tests Of Gaskets And Seals . . .28 21.1 General .28 21.2 Tensile strength and ultimate elongation test
17、s 28 21.3 Volume change test .29 MARKINGS 22 General 29 INSTRUCTIONS 23 Installation Instructions 30 DECEMBER 13, 2010 GREASE DUCTS - UL 1978 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APPENDIX A Standards for ComponentsA1 DECEMBER 13,
18、 2010 GREASE DUCTS - UL 1978 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover factory-built grease ducts, and grease duct assemblies that are intended to be installed at reduced clearances wh
19、ere 18 inch (457 mm) clearance is specied in the Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations, NFPA 96, and the International Mechanical Code. 1.2 These requirements also cover modular grease duct assemblies, unwelded connections between adjoining duct parts,
20、 ttings, access doors, and the like intended for use with grease ducts installed in accordance with NFPA 96 and the International Mechanical Code. 1.3 These requirements do not address NFPA 96 and the International Mechanical Code requirements for grease duct enclosures. Grease ducts covered only by
21、 these requirements are intended to be installed in a re resistive enclosure when required by NFPA 96 or the IMC. 1.4 Requirements used to evaluate the effectiveness of the combination of a grease duct and an enclosure as a re rated enclosure system and through penetration restop system, as well as
22、the enclosures effect on the grease duct are contained in Standard for Tests of Fire Resistive Grease Duct Enclosure Assemblies, UL 2221, and ASTM E 2336, Standard Test Methods for Fire Resistive Grease Duct Enclosure Systems. 2 Components 2.1 Except as indicated in 2.2, a component of a product cov
23、ered by this standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components used in the products covered by this standard. 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not
24、 required 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 constructi
25、on features 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. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 5UL COPYRIGHTED MATERIA
26、L NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undated reference to a code or standar
27、d appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Terminology 5.1 The term grease duct as used in these requirements refers to all grease ducts and grease duct assemblies and any part thereof covered by these requirem
28、ents unless specically noted otherwise. 6 Glossary 6.1 For the purpose of these requirements, the following denitions apply. 6.2 ACCESS DOOR A door or cover plate that when opened provides a means for cleaning the grease duct. 6.3 CAPPED TEES A part of a grease duct shaped like a T that supports, co
29、nnects, or both, the duct to the hood or vertical section. An access door or cap is provided to facilitate cleaning. 6.4 COMBUSTIBLE MATERIAL Material made of or surfaced with wood, compressed paper, plain bers, or other material that will ignite and burn, as applied to materials adjacent to or in c
30、ontact with heat-producing appliances, grease duct and vent connectors, steam and hot water pipes, and warm air ducts. Such material shall be considered as combustible even though ameproofed, re-retardant treated, or plastered. 6.5 FITTINGS Components of the grease duct system such as tees, elbows,
31、and wyes. 6.6 GREASE TRAP A cup-like or U-shaped part provided on a grease duct that is intended to accumulate grease for removal by personnel. 6.7 NONCOMBUSTIBLE MATERIAL A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion
32、, or release ammable vapors when subjected to re or heat. Materials that are reported as passing ASTM E136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750C are considered noncombustible materials. 6.8 THIMBLE The part of a grease duct that is intended to provide a m
33、eans for routing the grease duct assembly through a combustible wall. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 7 Materials 7.1 A grease duct part shall be made of noncombustible c
34、orrosion-resistant materials. Metals shall not be used in combinations at any location within the assembly that are capable of causing galvanic action. 7.2 The minimum thickness of sheet metal, including any coatings, and of other materials shall comply with Table 7.1. Table 7.1 Minimum thickness of
35、 sheet metal Minimum thickness of sheet metal inches (mm) Aluminum alloys (1100, 3003) 0.018 (0.46) Steel 0.0598 (1.52) Galvanized steel (G90 coating class) 0.018 (0.46) Aluminum-coated steel 0.40 ounce per square foot (0.12 kg/m 2 ) 0.018 (0.46) Stainless steel 0.012 (0.30) Porcelain-coated steel-b
36、ase metal 0.026 (1.35) 7.3 Parts of a grease duct or conduit subject to contact by grease-laden vapors shall be of stainless steel or porcelain-coated steel of the minimum thickness specied in Table 7.1. 7.4 An outer casing or other structural part shall be of stainless steel, galvanized steel, or a
37、luminum-coated steel when: a) Deterioration or corrosion would cause the grease duct system to collapse or otherwise increase the risk of injury to persons; or b) It is subject to condensation. 7.5 Components of a grease duct, or subassemblies, shall be of materials and thicknesses as specied in Tab
38、le 7.1. 7.6 A painted part made of steel not less than 0.053 inch (1.35 mm) thick, or of cast iron not less than 0.125 inch (3.18 mm) thick, and for use only in the interior of buildings, is corrosion resistant provided that coatings remain intact at the maximum temperatures obtained on the part dur
39、ing the tests specied in these requirements. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7.7 Thermal insulation material shall be noncombustible. 7.8 Thermal insulation shall not come into contac
40、t with the grease-laden vapors. 7.9 Thermal insulation that is not self-supporting shall be applied to solid surfaces so that the insulation does not sag. An adhesive or cement used to attach such material shall retain its adhesive qualities at any temperature the adhesive may attain when tested in
41、accordance with these requirements and at 0F (minus 18C). 7.10 A water-absorbing insulating material shall not be subject to wetting by condensation or rain when installed as intended. 7.11 Asbestos material shall not be used. 8 Assembly 8.1 A grease duct shall consist of all the essential parts nec
42、essary for the intended installation of a complete grease duct assembly. Each part of the assembly shall be constructed for ready attachment of one to the other without requiring alteration by the installer, such as by cutting, threading, drilling, or similar tasks. Exception: An assembly or compone
43、nt part intended to be cut to length or to be tted by the installer may be provided if means are furnished for joining any altered part to a companion part or assembly. All fasteners required to complete the assembly shall be provided with the product by the manufacturer. Drilling is acceptable if:
44、a) The drilling operation does not weaken the assembly or penetrate into the inner casing of the grease duct; and b) The size of the required drill bit is specied and the instructions clearly describe the locations to be drilled, such as by the use of drawings, descriptions, templates, or the like.
45、Field welding of grease duct parts such as for connection to the exhaust hood is permitted. 8.2 Two or more parts or subassemblies that bear a denite relationship to each other in the intended application shall: a) Be arranged and constructed so that they are capable of being incorporated in to the
46、complete assembly without need for alteration or alignment and only in the correct relationship with each other; or b) Be assembled and shipped from the factory as one unit. 8.3 Each part, such as a grease duct section or length, tee, or support component, shall be completely assembled by the manufa
47、cturer at the factory. 8.4 To comply with the requirements of 8.3, a grease duct section comprised of the inner casing of the grease duct, formed insulation or other intermediate assembly, and an outer jacket, all of which may be separable, shall be preassembled and packaged as one unit. In such cas
48、es, each separable part shall be completely formed, including the joining of all seams. DECEMBER 13, 2010 GREASE DUCTS - UL 1978 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.5 After being installed in accordance with the manufacturers
49、instructions, a grease duct shall be positioned securely, and shall be resistant to damage. See Vertical Support Test, Section 17; and Strength Test, Section 18. 8.6 The construction of a grease duct shall not void the restopping required between spaces of a building when the grease duct is installed in accordance with the manufacturers instructions. 8.7 Any access doors, and penetrations shall employ a liquid-tight continuous weld. Exception: This requirement does not apply to a
