1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 246 Hydrants for Fire-Protection ServiceUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR F
2、URTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Hydrants for Fire-Protection Service, UL 246 Eighth Edition, Dated May 25, 2011 Summary of Topics This revision of UL 246 includes new 1.2A for clarication of the scope relative to traffic anges. Text that has been changed in any manner
3、or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The new requirements are substantially in accordance with Proposal(s) on this subject dated September 2, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval syste
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7、mless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. NOVEMBER 6, 2015 UL 246 tr1UL COPYRIGHTED MATERI
8、AL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 6, 2015 UL 246 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 25, 2011 (Title Page Reprinted: November 6, 2015) 1 UL
9、246 Standard for Hydrants for Fire-Protection Service Previous numbered and unnumbered editions of standards covering Hydrants for Fire-Protection Service have been published predating 1912. Editions published prior to 1938 were not identied by edition number. The First, Second and third editions we
10、re titled Hydrants, Private and Municipal Fire Department Service . First Edition January, 1939 Second Edition April, 1947 Third Edition January, 1958 Fourth Edition September, 1967 Fifth Edition May, 1973 Sixth Edition July, 1979 Seventh Edition June, 1973 Eighth Edition May 25, 2011 This UL Standa
11、rd for Safety consists of the Eighth Edition including revisions through November 6, 2015. 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 Syste
12、m (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. 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. COPYRIGH
13、T 2015 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 5, 2013 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DIST
14、RIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 General 5 2.1 Components 5 2.2 Units of measurement .6 2.3 Undated references .6 3 Glossary 6 4 Metallic Materials .6 CONSTRUCTION 5 Outlets .7 6 Rated Pressure .8 7 Tops for Base Valve Hydrants 8 8 Barrels 8 9 Inlets .10 10 Main
15、 Valves for Base Valve Hydrants .10 11 Main Valves for Wet Barrel and Base Valve Hydrants 10 12 Clearances .10 13 Hydrant Drip Valves (Drain Valves) for Base Valve Hydrants .11 14 Operating Stems and Mechanisms for Base Valve Hydrants 11 15 Fire Hose and Pumper Connections and Valves 12 15.1 General
16、 .12 15.2 Base valve hydrants .12 15.3 Wet barrel hydrants 13 16 Hydrants With Monitor Elbows 13 17 Hose Caps .14 18 Stuffing Boxes and Seals .14 18A Protective Interior Coatings 15 PERFORMANCE 19 Samples .15 20 Metallic Materials 15 21 10-Day Moist Ammonia Air Stress Cracking Test 15 22 Nonmetallic
17、 Materials Test 16 22.1 Plastic or other nonmetallic parts (excluding rubber and synthetic elastomers) 16 22.2 Elastomeric parts (except gaskets) 17 23 Operation 18 24 Leakage 18 25 Strength of Body 19 26 Loss of Head .19 27 Operating Torque 20 28 Tests on Organic Coating Materials (Deleted) 21 28A
18、Tests on Protective Interior Coatings .21 MANUFACTURING AND PRODUCTION TESTS 29 General 21 FEBRUARY 5, 2013 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARKING 30 General 24 FEBRUARY 5, 2013
19、 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover the performance of and methods for testing hydrants intended for use in piping systems supplyin
20、g water for re-protection service. 1.2 Hydrant types covered by this standard include: a) Base valve design and b) Wet barrel design. 1.2A Traffic model hydrants of both the base valve and wet barrel design may be covered by this Standard. However, these requirements are not intended to cover the pe
21、rformance of and methods for testing break features of traffic model hydrants. 1.3 Requirements for the installation and use of hydrants covered by these requirements include, among others, the Standard for the Installation of Private Fire Service Mains, NFPA 24. 1.4 A product that contains features
22、, characteristics, materials, or systems new or different from those in use when the standard was developed, and that involves a risk of re, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined by the intent of
23、this standard. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.1.2 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. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are incomplete in constr
25、uction 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. NOVEMBER 6, 2015 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 2
26、46 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of measurement 2.2.1 If a value for measurement is followed by a value in other units in parentheses, the second value may be only approximate. 2.3 Undated references 2.3.1 Any un
27、dated 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. 3 Glossary 3.1 For the purposes of this standard, the following denitions apply. 3.2 BASE VALVE DESIGN HYDRANT (DRY BARREL) A hydrant
28、 intended for use in all climates where the main valve is installed below the frost line and the main valve is either the compression type, opening with the pressure or against pressure, or gate type with the outlets individually valved or without valves. 3.3 HYDRANT An exterior valved connection to
29、 a water supply system that provides connections for hoses. 3.4 NPS (NOMINAL PIPE SIZE) A dimensionless designator for pipe sizes dened in standards including the Standard Specication for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless, ASTM A53/A53M; Standard Specication for Ele
30、ctric-Resistance-Welded Steel Pipe, ASTM A135/A135M; and Standard Specication for Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless Steel Pipe for Fire Protection Use, ASTM A795/A795M. Used to replace terms such as nominal diameter and nominal size. 3.5 WET BARREL HYDRANT A hydrant w
31、ith each outlet equipped with a valve that has pressurized water at the outlet valves at all times and is intended for use in climates where there is no danger of freezing weather. 4 Metallic Materials 4.1 Metallic materials used in hydrant samples shall conform to the minimum physical property requ
32、irements of the latest edition of the applicable ASTM or equivalent material standard as specied by the manufacturer. MAY 25, 2011 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONSTRUCTION 5
33、Outlets 5.1 A hydrant shall have not less than two outlets, each of which shall have an inside diameter not smaller than 2-1/2 inches (64 mm). Exception: A hydrant incorporating a monitor elbow (see Hydrants With Monitor Elbows, Section 16, may be provided with only one outlet. 5.2 Outlets of a base
34、 valve hydrant, if individually valved, shall be provided with hose valves of the gate type complying with the Standard for Hose Valves for Fire-Protection Service, UL 668. 5.3 Outlets of a wet barrel hydrant shall be provided with hose valves of the built-in compression type or the equivalent. 5.4
35、The top of a wet barrel hydrant may have a threaded boss of sufficient thickness to permit installation of a supplementary hose outlet valve. 5.5 Outlet threads of hydrants for coupling of re and pumper hose shall have external threads and shall conform to the Standard for Screw Threads and Gaskets
36、for Fire Hose Connections, NFPA 1963. Essential features of these threads are given in Table 5.1. Table 5.1 National re protection association standard hose thread details a Nominal inside diameter of hose coupling, inches Number of threads per inch Length of threaded portion of nozzle, inches (appr
37、ox.) Outside diameter of male threads, inches (approx.) Length, pilot to start of second thread, inches 2-1/2 7-1/2 1 3-1/16 1/4 3 6 1-1/8 3-5/8 5/16 3-1/2 6 1-1/8 4-1/4 5/16 4 4 1-1/4 5 7/16 4-1/2 4 1-1/4 5-3/4 7/16 a 1 inch = 25.4 mm 5.6 Outlet threads of hydrants for coupling of re and pumper hos
38、e shall be permitted to have external threads that differ from the Standard for Fire Hose Connections, NFPA 1963, where the Authorities Having Jurisdiction (AHJs) designates other thread specications. 5.7 Nonthreaded outlets shall be permitted for pumper outlets in the 4- and 5-inch sizes when the o
39、utlets include evaluation for compliance with the requirements for construction of metal-face hydrant connections, Internal Strength, Tensile Strength, Corrosion Resistance, Gasket Materials, Vacuum, Force to Connect and Disconnect as applicable, specied in the Standard for Fire Hose Connections, NF
40、PA 1963 and the requirements of this standard. NOVEMBER 6, 2015 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Rated Pressure 6.1 A hydrant shall be constructed for a minimum rated pressure o
41、f 150 psig (1034 kPa). 7 Tops for Base Valve Hydrants 7.1 The hydrant top or bonnet shall be made of material having strength, rigidity, and resistance to corrosion equivalent to cast iron, be free-draining, be weather resistant, and of a type that will maintain the operating mechanism in readiness
42、for use under freezing conditions. It shall be tamper resistant and shall be provided with a convenient means for lubrication. 8 Barrels 8.1 A hydrant barrel shall be made of material having strength, rigidity, and resistance to corrosion equivalent to cast-iron having a wall thickness not less than
43、 specied by Table 8.1. A barrel of fractional inch diameter shall be made to the thickness of the next larger diameter. Table 8.1 Barrel wall thickness a Inside diameter of barrel, inches Cast iron Ductile iron Minimum wall thickness, inches Tolerance, inches (minus) Minimum wall thickness, inches T
44、olerance, inches (minus) 5 (minimum) 0.42 0.07 0.34 0.06 6 0.43 0.07 0.35 0.06 7 0.46 0.07 0.38 0.06 8 0.50 0.07 0.41 0.06 9 0.56 0.08 0.46 0.07 10 0.63 0.08 0.52 0.07 a 1 inch = 25.4 mm 8.2 A barrel of a base valve hydrant and a wet barrel hydrant made in two sections shall have the upper anged con
45、nection located at least 2 inches (51 mm) above the ground line, except where purchase specications for a wet barrel hydrant require a deviation. 8.3 The part of a barrel for underground service shall be constructed so that there is no projection, ange, taper, or roughness by which the action of fro
46、st may lift the part. 8.4 A projection used to mark the bury depth of the hydrant, shall be permitted where the projection is not raised more than 1/8 inch (3.2 mm) above the casting surface. 8.5 When outlets for pressure gauges are required, the barrel of a base valve hydrant shall be drilled and t
47、apped with 1/4 inch (6.4 mm) pipe threads at a point back of and on a level with the hose outlets to receive a pressure gauge during eld tests of pipe systems. Such an opening is to be closed by a bronze plug. MAY 25, 2011 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 8UL COPYRIGHTED MATERIAL NOT AU
48、THORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.6 The bolting of pressure-holding castings shall be such that the maximum stress on any bolt will not exceed one-fourth of the elastic limit of the material, as computed using the stress area of the bolt. The stress area
49、is dened by the formula: Where: A s = The stress area in square inches D = The nominal bolt diameter in inches n = The number of threads per inch of bolt. The load on the bolts is to be computed on the basis of the rated water pressure effective over the area circumscribed by the center line of the bolts. MAY 25, 2011 HYDRANTS FOR FIRE-PROTECTION SERVICE - UL 246 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 9 Inlets 9
