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 Eleventh Edition, Dated October 20, 2017 Summary of Topics This new edition of ANSI/UL 448 was issued to
3、incorporate the following changes: Revised Requirements Related to Series 400 Stainless Steel for Interior Bolts or Screws Clarication of Requirements and Update Testing Details Maximum Horsepower Required to Drive the Pump The revised requirements are substantially in accordance with Proposal(s) on
4、 this subject dated July 28, 2017. 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 w
5、ithout 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, lo
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8、le purchaser is storing an electronic Standard on the purchasers computer system. OCTOBER 20, 2017 UL 448 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 20, 2017 UL 448 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZ
9、ED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 20, 2017 1 UL 448 Standard for Centrifugal Stationary Pumps for Fire-Protection Service The rst edition was titled Centrifugal Fire Pumps. The second edition was titled Pumping Equipment for Private Fire Service. The thir
10、d 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 November, 1975 Sixth Edition February, 1980 Seventh Edition November, 1984 Eighth Edition September,
11、 1994 Ninth Edition September, 2004 Tenth Edition June, 2007 Eleventh Edition October 20, 2017 This ANSI/UL Standard for Safety consists of the Eleventh Edition. The most recent designation of ANSI/UL 448 as an American National Standard (ANSI) occurred on October 19, 2017. ANSI approval for a stand
12、ard does not include the Cover Page, Transmittal Pages, 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:/
13、. 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. COPYRIGHT 2017 UNDERWRITER
14、S LABORATORIES INC. ANSI/UL 448-2017UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 20, 2017 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER R
15、EPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 Components4 3 Units of Measurement .4 4 Undated References 4 5 Glossary .5 CONSTRUCTION ALL PUMPS 6 General 6 SPLIT-CASE, END-SUCTION, IN-LINE, AND MULTISTAGE MULTIPORT PUMPS 7 Pump Casings 8 8 Impellers, Rings
16、, and Other Internal Components .9 9 Sleeve Bearings 9 10 Ball and Roller Bearings .10 11 Shaft Seals 11 VERTICAL-TURBINE PUMPS 12 Pump Discharge Heads .11 13 Pump Columns .12 14 Suction Vessels 12 15 Bowl Assemblies .13 16 Impellers.13 17 Impeller Shafts .13 18 Line Shafts.13 19 Line-Shaft Coupling
17、s 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 Test .14 25 Endurance Test 16 26 Hydrostatic Strength Tests .16 MANUFACTURING AND PRODUCTION TESTS 27 General16 MARKING 28 General17 OCTOBER
18、 20, 2017 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover centrifugal re pumps intended for use in water-supply systems for
19、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 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 standa
20、rd 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 in the application of the component in the product covered by this standard, or b) Is superseded by a requirement i
21、n 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 features or restricted in performance capabilities. Such components are intended for use only under limited conditions, su
22、ch 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 parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undated refe
23、rence 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. OCTOBER 20, 2017 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUC
24、TION 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 material having resistance to corrosion equivalent to or exceeding that of a brass, bronze, monel, or Series 300 stainless steel alloy.
25、5.3 PRESSURE, MAXIMUM NET The maximum net pressure developed by the pump at the rated speed which typically occurs at or near shutoff pressure. 5.4 PRESSURE, MAXIMUM WORKING For performance tests specied in this standard, the maximum pressure developed at the pump discharge ange under any condition
26、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, based on the conditions imposed by the particular installation for which the pump is constructed. The maximum net pressur
27、e 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 installation. 5.5 PRESSURE, NET (TOTAL HEAD): a) For a split-case, end-suction, in-line pump, multistage multiport, or a vertical-turbine pump in a
28、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 and corrected for differences in velocity head at the points of gauge attachment. b) For a vertical-turbine pump in a sump or well, the pre
29、ssure 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 distance from the pumping water level to the center of the gauge. 5.6 PRESSURE, SHUTOFF (CHURN) The net head developed by a pump at rated
30、speed with no water being delivered (discharge valve closed). 5.7 PUMP, 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 stuffing box and having the face of the suction nozzle perpendicular to the
31、longitudinal axis of the shaft. This type of pump is not intended to be used where a static suction lift is involved. 5.8 PUMP, FIRE A pump for horizontal or vertical mounting, having rated capacities in accordance with the requirements in the Standard for the Installation of Stationary Pumps for Fi
32、re Protection, NFPA 20. 5.9 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. This type of pump is not intended to be used where a stati
33、c suction lift is involved. 5.10 PUMP LOAD The brake horsepower (kW input) required to drive a pump at rated speed and at the capacity requiring maximum power. OCTOBER 20, 2017 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRO
34、DUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.11 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
35、at certain locations within the stages of the pump. 5.12 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
36、. 5.13 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 connect 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
37、 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-suction 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.
38、 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 A split-case, multistage multiport, vertical-turbine, end-suction, or in-line pump shall have a rated capacity equal to a value specied in
39、 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 capacities Gallons per minute (Liters per minute) Gallons per minute (Liters per minute) 25 (95) 2000 (7570) 50 (189) 2500 (9462) 100 (379) 3000
40、 (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) 1250 (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
41、 may affect the use for which it is intended. A casting shall not be plugged or lled, but may be impregnated to remove porosity. OCTOBER 20, 2017 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTION SERVICE - UL 448 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT
42、 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 inch (9.5 mm) in diameter. 6.5 An interior bolt or screw that is exposed to pumped water shall be constructed of a corrosion-resistant materi
43、al (see 5.2) or Series 400 stainless steel. 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 the stress area. The stress area is dened by the equation: in which: A s is the stress area in square inches
44、 (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 equivalent to the maximum working pressure over the area out to the centerline of the bolts. Exception: If
45、 an O-ring is used to provide a casing seal, the area inside the O-ring shall be permitted to be used to determine area for the bolt stress calculation. 6.7 The maximum combined shear stress for a pump shaft, based upon the minimum diameter at the root of threads or an undercut (not including underc
46、utting for keys), 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. For shafts with keyways, the allowable stress limits shall be 75 percent of the stresses calculated using the minimum shaft diameter a
47、t the key location (not including the undercut). Compliance with this requirement is to be veried by a review of manufacturers stress calculations. 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
48、 for Mechanical Vibration Balance Quality Requirements of Rigid Rotors, Part 1: Specication and Verication of Balance Tolerances, ISO 1940-1. Exception: 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
49、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 for Ductile Iron Pipe Flanges and Flanged Fittings : Classes 150 and 300, ANSI/ ASME B16.42; or OCTOBER 20, 2017 CENTRIFUGAL STATIONARY PUMPS FOR FIRE-PROTECTI
