1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 448 Centrifugal Stationary Pumps for Fire-Protection Service STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL C
2、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Centrifugal Stationary Pumps for Fire-Protection Service, UL 448 Tenth Edition, Dated June 8, 2007 Summary of Topics This revision of ANSI/UL 448 was issued to incorporat
3、e the following changes: Add Requirements Addressing Multistage Multiport Fire Pumps Clarication of Requirements Related to Pump Construction and Performance Testing Revised Requirements Related to Keyways to Secure Shafts and Impellers The revised requirements are substantially in accordance with P
4、roposal(s) on this subject dated October 23, 2015. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note i
5、ndicating the date of publication or the date on which the changed requirement becomes effective. 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 wi
6、thout 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 merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirec
7、t 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 authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any d
8、amage ever exceed the price paid for this Standard, regardless 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 attor
9、neys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. FEBRUARY 5, 2016 UL 448 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 5, 2016 UL 4
10、48 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 8, 2007 (Title Page Reprinted: February 5, 2016) 1 UL 448 Standard for Centrifugal Stationary Pumps for Fire-Protection Service The rst edition was titled Centri
11、fugal Fire Pumps. The second edition was titled Pumping Equipment for Private Fire Service. The third through ninth editions were titled Pumps for Fire Protection Service. First Edition November, 1942 Second Edition November, 1956 Third Edition October, 1967 Fourth Edition April, 1974 Fifth Edition
12、November, 1975 Sixth Edition February, 1980 Seventh Edition November, 1984 Eighth Edition September, 1994 Ninth Edition September, 2004 Tenth Edition June 8, 2007 This ANSI/UL Standard for Safety consists of the Tenth Edition including revisions through February 5, 2016. The most recent designation
13、of ANSI/UL 448 as an American National Standard (ANSI) occurred on February 3, 2016. ANSI approval for a standard does not include the Cover 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 a
14、ny 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 a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all cop
15、yrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2016 UNDERWRITERS LABORATORIES INC. ANSI/UL 448-2016UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 5, 2016 CENT
16、RIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 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 4 3 Units of Measurement .4 4 Undated References 4 5 Glossary 4
17、A CONSTRUCTION ALL PUMPS 6 General 4B SPLIT-CASE, END-SUCTION, IN-LINE, AND MULTISTAGE MULTIPORT PUMPS 7 Pump Casings 6 8 Impellers, Rings, and Other Internal Components .7 9 Sleeve Bearings 9 10 Ball and Roller Bearings 9 11 Shaft Seals 11 VERTICAL-TURBINE PUMPS 12 Pump Discharge Heads .11 13 Pump
18、Columns .12 14 Suction Vessels 12 15 Bowl Assemblies .13 16 Impellers .13 17 Impeller Shafts .13 18 Line Shafts .13 19 Line-Shaft Couplings 13 20 Line-Shaft Bearings .14 21 Shaft-Enclosing Tubing 14 22 Oil Lubricating Means for Enclosed Shafts .14 23 Suction Strainers .14 PERFORMANCE 24 Operation Te
19、st .14 25 Endurance Test 15 26 Hydrostatic Strength Tests .15 MANUFACTURING AND PRODUCTION TESTS 27 General 16 MARKING 28 General 16 FEBRUARY 5, 2016 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WIT
20、HOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover centrifugal re pumps intended for use in water-supply systems for re-protection service. 1.2 The pumps covered by these requirements are intended for installation and use in accordance with the Standard for the Installation of
21、 Stationary Pumps for Fire Protection, NFPA 20. 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 cha
22、racteristic not 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 incomplet
23、e 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. 3 Units of Measurement 3.1 Values stated without
24、parentheses are the requirement. Values in parentheses are explanatory or approximate information. 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. JUN
25、E 8, 2007 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5 Glossary 5.1 For the purposes of this standard, the following denitions apply. 5.2 CORROSION-RESISTANT MATERIAL A
26、material having resistance to corrosion equivalent to or exceeding that of a brass, bronze, monel, or Series 300 stainless steel alloy. 5.2.1 PRESSURE, MAXIMUM NET The maximum net pressure developed by the pump at the rated speed which typically occurs at or near shutoff pressure. 5.3 PRESSURE, MAXI
27、MUM WORKING For 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 val
28、ue may be lower, based on the conditions imposed by the particular installation for which the pump is constructed. The maximum net pressure and maximum positive suction pressure that are marked on the pump are those that indicate the acceptability of a pump (the limiting pressures) for an installati
29、on. 5.4 PRESSURE, NET (TOTAL HEAD): a) For a split-case, end-suction, in-line pump, multistage multiport, or a vertical-turbine pump in a suction vessel, the algebraic difference in psi (kPa) between pressures measured at the discharge ange and at the suction ange, corrected to the pump centerline a
30、nd corrected for differences in velocity head at the points of gauge attachment. b) For a vertical-turbine pump in a sump or well, the pressure measured by a pressure gauge attached just beyond the discharge head, corrected for the velocity head at the point of gauge attachment and for the vertical
31、distance from the pumping water level to the center of the gauge. 5.5 PRESSURE, SHUTOFF (CHURN) The net head developed by a pump at rated speed with no water being delivered (discharge valve closed). 5.6 PUMP, END-SUCTION A horizontal centrifugal pump characterized by having its suction nozzle on th
32、e pump centerline at the opposite side of the casing from the stuffing box and having the face of the suction nozzle perpendicular to the longitudinal axis of the shaft. This type of pump is not intended to be used where a static suction lift is involved. 5.7 PUMP, FIRE A pump for horizontal or vert
33、ical mounting, having rated capacities in accordance with the requirements in the Standard for the Installation of Stationary Pumps for Fire Protection, NFPA 20. 5.8 PUMP, IN-LINE A centrifugal pump, the drive unit for which is supported solely by the pump, and that is characterized by suction and d
34、ischarge connections having a common centerline that intersects the shaft axis. This type of pump is not intended to be used where a static suction lift is involved. 5.9 PUMP LOAD The brake horsepower (kW input) required to drive a pump at rated speed and at the capacity requiring maximum power. 5.9
35、.1 PUMP, MULTISTAGE MULTIPORT A centrifugal pump with multiple impellers operating in series where the discharge from each impeller, except for the last impeller, provides pressure to the subsequent stage and multiple discharge ports are provided at certain locations within the stages of the pump. F
36、EBRUARY 5, 2016 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 4AUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.10 PUMP, SPLIT-CASE A centrifugal pump characterized by a housing that is split axial or radial to the shaf
37、t, 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. 5.11 PUMP, VERTICAL-TURBINE A centrifugal pump with one or more impellers discharging into one or more bowls and a vertical eductor or column pipe used to conn
38、ect the bowls to the discharge head on which the pump driver is mounted. The pump may also be provided with a suction vessel as an integral part. Vertical turbine pumps not provided with suction vessels are intended for installation in sumps or wells. CONSTRUCTION ALL PUMPS 6 General 6.1 An end-suct
39、ion or in-line pump shall be of a single- or two-stage construction. A split-case pump may be of a single-stage or multistage construction. A multistage multiport pump shall be of a multistage construction with multiple outlets. A vertical-turbine pump may have any number of bowls and impellers. 6.2
40、 A split-case, multistage multiport, vertical-turbine, end-suction, or in-line pump shall have a rated capacity equal to a value specied in Table 6.1, or greater than 5000 gallons per minute (18925 liters per minute) in 500 gallons per minute (1892 liters per minute) increments. Table 6.1 Pump capac
41、ities Gallons per minute (Liters per minute) Gallons per minute (Liters per minute) 25 (95) 2000 (7570) 50 (189) 2500 (9462) 100 (379) 3000 (11355) 150 (568) 3500 (13247) 200 (757) 4000 (15140) 250 (946) 4500 (17032) 300 (1136) 5000 (18925) 400 (1514) 450 (1703) 500 (1892) 750 (2839) 1000 (3785) 125
42、0 (4731) 1500 (5677) 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 which it is intended. A casting shall not be plugged or lled, but may be impregnated to remove porosity. FEBRUARY 5, 2016 CENTRIFUGAL STA
43、TIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 4BUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.4 A bolt, stud, cap screw, or gland swing bolt used to assemble parts subject to stress due to water pressure shall not be less than 3/8 i
44、nch (9.5 mm) in diameter. 6.5 An interior bolt or screw that is exposed to pumped uid shall be of rolled bronze or other corrosion-resistant material. 6.6 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 t
45、he 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 in 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
46、 equivalent to the maximum working pressure over the area out to the centerline of the bolts. 6.7 The maximum combined shear stress for a pump shaft, based upon the minimum diameter (not including undercutting for keys), shall not exceed 30 percent of the elastic limit in tension or be more than 18
47、percent of the ultimate tensile strength of the shafting steel used. For shafts with keyways, the allowable stress limits shall be 75 percent of the stresses calculated using the minimum shaft diameter. Compliance with this requirement is to be veried by a review of manufacturers stress calculations
48、. 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, Part 1: Specication and Verication of Balance Tolerances, ISO 1940-1. Exce
49、ption: The impellers may be statically (single plane) balanced in accordance with ISO 1940-1 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. 6.9 Flange dimensions and bolt layouts used in pipe connections shall comply with the requirements of one of the following standards: a) Standard for Cast Iron Pipe Flanges and Flanged Fittings, ANSI/ASME B16.1; b) Standard fo
