1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 448A Flexible Couplings and Connecting Shafts for Stationary Fire PumpsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTE
2、D MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Flexible Couplings and Connecting Shafts for Stationary Fire Pumps, UL 448A First Edition, Dated December 23, 2008 SUMMARY OF TOPICS The following changes in requirements to the S
3、tandard for Flexible Couplings and Connecting Shafts for Stationary Fire Pumps, UL 448A, are being adopted: Clarify and Update Requirements Related to the Construction, Performance Testing and Marking of Flexible Couplings and Connecting Shafts Text that has been changed in any manner or impacted by
4、 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 indicating the date of publication or the date on which the changed requirement becomes effective. The new
5、and revised requirements are substantially in accordance with Proposal(s) on this subject dated May 10, 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
6、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 merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequent
7、ial, 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 authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liabili
8、ty for any damage 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 reas
9、onable attorneys fees) resulting from any error or deviation introduced while 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 Standar
10、d having future effective dates as indicated in the note following the affected 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. JULY 10, 2013 UL 448A tr1UL COPYRIG
11、HTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 10, 2013 UL 448A 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: July 10,
12、2013) 1 UL 448A Standard for Flexible Couplings and Connecting Shafts for Stationary Fire Pumps First Edition December 23, 2008 This ANSI/UL Standard for Safety consists of the First Edition including revisions through July 10, 2013. The most recent designation of ANSI/UL 448A as an American Nationa
13、l Standard (ANSI) occurred on July 9, 2013. The ANSI approval for this 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 any time. Proposals should be submi
14、tted 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 copyrights, ownerships, and rights re
15、garding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 448A-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 10, 2013 UL 448A 2 No Text on This PageUL COPYRIG
16、HTED 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 5 5 Glossary .5 CONSTRUCTION 6 General 5 7 Sizes 5 8 Hubs and Power Transmission Components .6 9 Drive Mecha
17、nisms 6 10 Flexible Connecting Shaft Bearings 6 11 Fasteners .6 PERFORMANCE 12 General .6A 13 Endurance and Starting Cycle .7 13.1 General 7 13.2 Flexible coupling test method .7 13.3 Flexible connecting shaft method 8 14 Aging Tests, Polymeric Materials 9 MANUFACTURING AND PRODUCTION TESTS 15 Gener
18、al 10 MARKINGS 16 General 10 INSTALLATION INSTRUCTIONS 17 Installation Instructions 11 JULY 10, 2013 UL 448A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover exible couplings and exible conne
19、cting shafts intended to connect the shaft of a stationary re pump to a re pump driver. 1.2 Flexible couplings and exible connecting shafts covered by this standard are intended for installation and use in accordance with the Standard for Installation of Stationary Pumps for Fire Protection, NFPA 20
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 characteristic not required in the application of
21、 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 construction features or restricted in pe
22、rformance 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 parentheses are the requirement. Values in par
23、entheses are explanatory or approximate information. DECEMBER 23, 2008 UL 448A 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requirements of this standa
24、rd shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 For the purposes of this standard, the following denitions apply. 5.2 FLEXIBLE CONNECTING SHAFT A device that incorporates two exible joints and a telescoping element that is used to connect a driver
25、to a pump. 5.3 FLEXIBLE COUPLING A device used to connect the shafts or other torque-transmitting components from a driver to the pump that permits minor angular and parallel misalignment. 5.4 MODEL (exible coupling or exible connecting shaft) A designation, at minimum, dening the torque transmittin
26、g capacity of the product. 5.5 SERVICE FACTOR A factor referenced in the manufacturers installation that is intended to be applied to the calculated end use application torque based upon the type of pump and driver to be connected with the coupling or connecting shaft. 5.5 added July 10, 2013 CONSTR
27、UCTION 6 General 6.1 A exible coupling or exible connecting shaft shall comply with the applicable requirements of the Standard for the Installation of Stationary Pumps for Fire Protection, NFPA 20. 7 Sizes 7.1 A exible coupling or exible connecting shaft shall be constructed to be compatible with t
28、he sizes of re pump and driver shafts specied in the installation instructions. JULY 10, 2013 UL 448A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8 Hubs and Power Transmission Components 8.1 A exible coupling or exible connecting shaft
29、shall be constructed in such a manner that the hub or power transmission component(s) of the driver shaft is mechanically attached to the hub or power transmission components of the pump shaft. 9 Drive Mechanisms 9.1 A exible coupling incorporating a primary drive mechanism constructed of a polymeri
30、c material shall be provided with a secondary drive mechanism to operate the pump temporarily in the event that the primary drive mechanism discontinues to drive the pump shaft. See Section 13, Endurance and Starting Cycle. 10 Flexible Connecting Shaft Bearings 10.1 Flexible connecting shaft needle
31、or roller bearings shall have a B-10 rating of not less than 5,000 hours for all speeds within a rated speed range based on the following equation unless the published bearing factor for the universal joint is intended to be utilized in different equation L h = (1.5 x 10 6 )/( NxA ) x( B f /T r ) 10
32、/3 in which: L h is the B-10 rating in hours; N is the speed associated with the torque rating in revolutions per minute; A is the intended operating angle in degrees; B f is the bearing factor published for the universal joint in ft-lbs; and T r is the torque rating as tested in Section 13, Enduran
33、ce and Starting Cycle in ft-lbs. 10.1 revised July 10, 2013 11 Fasteners 11.1 Fasteners supplied with the coupling shall be of a type that will withstand the anticipated forces during assembly and use. JULY 10, 2013 UL 448A 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBU
34、TION WITHOUT PERMISSION FROM UL PERFORMANCE 12 General 12.1 Representative samples of exible couplings or exible connecting shafts are to be subjected to the tests described in Section 13, Endurance and Starting Cycle, and Section 14, Aging Tests, Polymeric Materials. JULY 10, 2013 UL 448A 6AUL COPY
35、RIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 10, 2013 UL 448A 6B No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 13 Endurance and Starting Cycle 13.1 General 13.
36、1.1 When tested as specied in 13.2.1 13.2.3, a exible coupling or exible connecting shaft shall: a) Remain in the installed position; b) Transmit the specied power from the driver; c) Remain completely intact on the shafts; and d) Not show excessive wear such that it becomes inoperable, causes risk
37、of injury to persons, or causes damage to the coupling, connecting shaft, or shaft which affects the means of attachment that would impair the intended use. 13.1.2 Testing with diesel engines in accordance with 13.2.1 or 13.3.1 is considered representative of electric motor drivers. Testing in accor
38、dance with 13.2.1 or 13.3.1 shall be permitted to be conducted using a electric motor driver provided the end use of the exible coupling or connecting shaft is limited to connecting re pumps to electric drivers. A exible coupling or connecting shaft intended for use with both engine and electric mot
39、or drivers shall be subjected to the starting tests described in 13.2.2 or 13.3.2, as applicable, using both an engine and electric driver. A exible coupling or connecting shaft intended for use with an engine driver only or an electric motor only shall be permitted to be subjected to the starting t
40、ests described in 13.2.2 or 13.3.2, as applicable, using the type of driver referenced in the manufacturers installation instructions. 13.1.3 For the purposes of the testing described in 13.2 and 13.3, the maximum rated speed is considered to be achieved when the measured speed for the test is at le
41、ast 97 percent of the rated speed referenced in the manufacturers instructions. 13.2 Flexible coupling test method 13.2.1 A representative sample of each exible coupling model is to be tested. A exible coupling is to be installed to connect the shafts of a driver (see 13.1.2) and dynamometer or othe
42、r similar torque-transmitting device in a manner, as specied in the exible coupling manufacturers instructions, to represent: a) 200 percent of the maximum permitted angular and parallel misalignment; and b) The maximum gap between the shaft hubs. The exible coupling is to be operated continuously f
43、or no less than 24 hours while transmitting driver horsepower to provide for a shaft torque equivalent to the maximum torque rating of the exible coupling and the maximum rated speed as specied in the coupling manufacturers installation instructions for re pump use. After the 24 hour test duration,
44、the same exible coupling sample shall be operated for no less than 8 hours while transmitting the engine horsepower to provide for a shaft torque equivalent to the minimum torque rating and the maximum rated speed specied in the coupling manufacturers installation for re pump use. DECEMBER 23, 2008
45、UL 448A 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 13.2.2 Before and after the endurance test specied in 13.2.1, the driver (see 13.1.2) is to be started and accelerated as quickly as possible to maximum rated speed at rated torque, op
46、erated at that speed for no less than 30 seconds, and then stopped. Starting tests conducted with an electric motor driver shall be conducted using an across-the-line starting arrangement. A test arrangement simulating the starting of an across-the-line motor shall be permitted to be used if it is d
47、emonstrated to be an equivalent or more challenging starting condition. For a diesel engine driver, the time to achieve the maximum rated speed at rated torque shall not exceed 20 seconds. A total of 40 starting cycles are to be conducted for each driver type intended for use with the exible couplin
48、g. For each driver, twenty cycles are to be conducted before the endurance test, and twenty cycles after the endurance tests. All starting tests are to be conducted with the exible coupling aligned as described in 13.2.1. 13.2.2 revised July 10, 2013 13.2.3 In addition to the tests specied in 13.2.1
49、 and 13.2.2, a exible coupling tted with a primary drive mechanism constructed of a polymeric material shall be connected to a torque transmitting device to provide for the misalignment specied in 13.2.1. With the primary polymeric drive mechanism removed, the secondary drive mechanism shall be operated at the maximum and minimum rated shaft torques specied in 13.2.1 for two hours of operation each with the driver used during the testing described in 13.2.1. Obse
