1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 448B Residential Fire Pumps Intended for One- and Two-Family Dwellings and Manufactured HomesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSIO
2、N FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Residential Fire Pumps Intended for One- and Two-Family Dwellings and Manufactured Homes, UL 448B First Edition, Dated December 23, 2008 Summary of Topics Th
3、ese revisions to the First Edition of ANSI/UL 448B include the following changes in requirements: Clarify and Update Requirements Related to Pump Construction and Performance Testing Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical li
4、ne in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the changed requirement becomes effective. The new requirements are substantially in accordance with Proposal(s)
5、on this subject dated June 7, 2013. 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
6、without warranty 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, l
7、oss of data, 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
8、 of the form 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 wh
9、ile purchaser 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 aff
10、ected item. The 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. AUGUST 28, 2013 UL 448B tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WI
11、THOUT PERMISSION FROM UL AUGUST 28, 2013 UL 448B tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 23, 2008 (Title Page Reprinted: August 28, 2013) 1 UL 448B Standard for Residential Fire Pumps Intended for One
12、- and Two-Family Dwellings and Manufactured Homes Prior to the rst edition, the requirements for the products covered by this standard were included in the Outline of Investigation for Residential Fire Pumps Intended for One- and Two-Family Dwellings and Manufactured Homes, SU 448B. First Edition De
13、cember 23, 2008 This ANSI/UL Standard for Safety consists of the First Edition including revisions through August 28, 2013. The most recent designation of ANSI/UL 448B as an American National Standard (ANSI) occurred on August 27, 2013. The ANSI approval for this standard does not include the Cover
14、Page, Transmittal Pages, Title Page, or effective date 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
15、 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. COPYRIGHT 2013 UNDERWRITERS LAB
16、ORATORIES INC. ANSI/UL 448B-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 23, 2008 UL 448B 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTEN
17、TS INTRODUCTION 1 Scope .4 2 Components 4 3 Units of Measurement 4A 4 Undated References .4A 5 Glossary 4A CONSTRUCTION 6 General 6 7 Pump Casings 9 8 Impellers, Rings, and Other Internal Components .9 9 Ball and Roller Bearings 10 10 Shaft Seals 11 PERFORMANCE 11 Operation Test .12 12 Hydrostatic S
18、trength Test 13 13 Plastic Impellers or Other Internal Primary Pump Components (Except Bushings, Seal Rings, Coatings and Similar Components) .13 13.1 Air oven aging .13 13.2 Water aging .14 14 Maximum Operating Temperature Test 14 MANUFACTURING AND PRODUCTION TESTS 15 General 15 MARKINGS 16 General
19、 15 DECEMBER 23, 2008 UL 448B 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover re pumps intended for use in water-supply systems for one- and two-family dwellings and manufactured homes. 1.1
20、effective December 23, 2010 1.2 The pumps covered by these requirements are intended for installation and use in accordance with the Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, NFPA 13D. 1.2 effective December 23, 2010 2 Components 2.1
21、Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. 2.1 effective December 23, 2010 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the a
22、pplication of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.2 effective December 23, 2010 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.3 effective December 23, 2010 2.4
23、Specic components are incomplete in construction 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. 2.4 effective Dece
24、mber 23, 2010 DECEMBER 23, 2008 UL 448B 4UL COPYRIGHTED MATERIAL 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. 3.1
25、effective December 23, 2010 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. 4.1 effective December 23, 2010 5 Glossary 5.1 For the purpose of this sta
26、ndard, the following denitions apply. 5.1 effective December 23, 2010 5.2 CORROSION-RESISTANT MATERIAL A material having resistance to corrosion equivalent to or exceeding that of a brass or bronze alloy, or series 300 stainless steel. 5.2 effective December 23, 2010 5.3 PRESSURE, MAXIMUM WORKING Fo
27、r performance tests specied in this standard, the maximum pressure developed at the pump discharge ange under any condition of intended use determined by the sum of the maximum net pressure developed by the pump and the allowed positive suction pressure. For production tests, this value may be lower
28、, based on the conditions imposed by the particular installation for which the pump is constructed. The maximum positive suction pressure marked on the pump indicates the acceptability of a pump inlet pressures for an installation. 5.3 effective December 23, 2010 5.4 PRESSURE, NET (TOTAL HEAD) The a
29、lgebraic difference in psi (kPa) between pressures measured at the discharge ange and at the suction ange, corrected to the pump centerline and corrected for differences in velocity head at the points of gauge attachment. 5.4 effective December 23, 2010 5.5 PRESSURE, SHUTOFF (CHURN) The net head dev
30、eloped by a pump at rated speed with no water being delivered (discharge valve closed). 5.5 effective December 23, 2010 5.5.1 PRESSURE, MAXIMUM NET The maximum net pressure developed by the pump at rated speed which typically occurs at or near shutoff pressure. 5.5.1 added August 28, 2013 5.6 PUMP,
31、END-SUCTION A horizontal centrifugal pump characterized by having its suction nozzle on the pump centerline at the opposite side of the casing from the mechanical seal and having the face of the suction nozzle perpendicular to the longitudinal axis of the shaft. This type of pump is not intended to
32、be used where a static suction lift is involved. 5.6 effective December 23, 2010 5.7 PUMP, IN-LINE A centrifugal pump, the drive unit for which is supported solely by the pump, and that is characterized by suction and discharge connections having a common centerline that intersects the shaft axis. T
33、his type of pump is not intended to be used where a static suction lift is involved. 5.7 effective December 23, 2010 AUGUST 28, 2013 UL 448B 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.8 PUMP LOAD The brake horsepower (kW input) requ
34、ired to drive a pump at rated speed and at the capacity requiring maximum power. 5.8 effective December 23, 2010 AUGUST 28, 2013 UL 448B 4BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 28, 2013 UL 448B 5 No Text on This PageUL COPYR
35、IGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.9 PUMP, RESIDENTIAL FIRE A pump intended for installation in accordance with the Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes, NFPA 13D.
36、5.9 effective December 23, 2010 5.10 PUMP, SPLIT-CASE A centrifugal pump characterized by a housing that is split axial or radial to the shaft, and mounted in the horizontal or vertical position. This type of pump is not intended to be used where a static suction lift is involved. 5.10 effective Dec
37、ember 23, 2010 CONSTRUCTION 6 General 6.1 These requirements are intended to address end-suction, in-line pump or split-case residential pumps. This is not intended to preclude the investigation of pumps having different design features as long as an equivalent level of performance is provided. 6.1
38、effective December 23, 2010 6.2 A residential re pump shall have a rated capacity equal to a value specied in Table 6.1, or greater than 100 gallons per minute (379 liters per minute). 6.2 effective December 23, 2010 Table 6.1 Pump capacities Table 6.1 effective December 23, 2010 Gallons per minute
39、(Liters per minute) 20 (76) 25 (95) 30 (114) 35 (132) 40 (151) 45 (170) 50 (189) 55 (208) 60 (227) 65 (246) 70 (265) 75 (284) 80 (303) 90 (341) 100 (379) 6.3 A casting shall be smooth and free from scale, lumps, cracks, blisters, sand holes, and defects of any nature that may affect the use for whic
40、h it is intended. A casting shall not be plugged or lled, but may be impregnated to remove porosity. 6.3 effective December 23, 2010 AUGUST 28, 2013 UL 448B 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.4 A bolt, stud, cap screw, or gla
41、nd swing bolt used to assemble parts subject to stress due to water pressure shall not be less than 1/4 inch (6.4 mm) in diameter. 6.4 effective December 23, 2010 6.5 An interior bolt or screw that is exposed to pumped uid shall be a corrosion-resistant material. 6.5 effective December 23, 2010 6.6
42、The maximum stress on any bolt of a pressure-holding casting shall not exceed one-fourth the elastic limit of the material as computed by using the stress area. The stress area is dened by the equation: in which: A s is the stress area in square inches (m 2 1550); D is the nominal diameter of bolt i
43、n inches (mm 0.04); and n is the number of threads per inch (25.4 mm). The load on the bolts is to be computed on the basis of the water pressure equivalent to the maximum working pressure over the area out to the centerline of the bolts. 6.6 revised August 28, 2013 6.7 The maximum combined shear st
44、ress for a pump shaft shall not exceed 30 percent of the elastic limit in tension or be more than 18 percent of the ultimate tensile strength of the shafting steel used. Compliance with this requirement is to be veried by a review of manufacturers stress calculations. 6.7 effective December 23, 2010
45、 6.8 The impellers shall be dynamically balanced to the G6.3 balance quality grade in accordance with the requirements for pump impellers in the Standard for Mechanical Vibration Balance Quality Requirements of Rigid Rotors, ANSI S2.19. Exception: The impellers may be statically balanced in accordan
46、ce with ANSI S2.19 if the ratio of the maximum outside diameter to the width at the periphery (including the shroud but not including the back vane) is equal to or greater than 6. 6.8 effective December 23, 2010 6.9 Flange dimensions and bolt layouts used in pipe connections shall comply with the re
47、quirements in the Standard for Cast Iron Pipe Flanges and Flanged Fittings, ANSI/ASME B16.1; the Standard for Ductile Iron Pipe Flanges and Flanged Fittings, ANSI/ASME B16.42; or when steel is used, the Standard for Pipe Flanges and Flanged Fittings; NFPA through 24, ANSI/ASME B16.5; or other nation
48、al pipe ange standards. 6.9 revised August 28, 2013 AUGUST 28, 2013 UL 448B 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.10 A threaded opening used for pipe connection shall comply with the requirements in the Standard for Pipe Threads
49、, General Purpose, ANSI/ASME B1.20.1 or other national pipe thread standards. 6.10 effective December 23, 2010 6.11 The minimum pipe sizes for the suction and discharge piping shall be as specied in Table 6.2. Pumps are not restricted from having threaded or ange sizes other than the pipe sizes specied in Table 6.2 when tted with an increaser tting for connection to the minimum pipe size. 6.11 effective December 23, 2010 Table 6.2 Size of openings for pumps Table 6.2 effective Dec
