1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 789 Indicator Posts for Fire-Protection ServiceUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZE
2、D FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Indicator Posts for Fire-Protection Service, UL 789 Tenth Edition, Dated January 9, 2004 SUMMARY OF TOPICS This revision to ANSI/UL 789 is being issued to reect the reaffirmation of the ANSI approval of
3、the Standard. No technical changes have been made to the document. 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 effec
4、tive date note indicating the date of publication or the date on which the changed requirement becomes effective. The revised requirements are substantially in accordance with Proposal(s) on this subject dated November 9, 2012. All rights reserved. No part of this publication may be reproduced, stor
5、ed 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 without warranty of any kind, either expressed or implied, including but not limited to, the implied warrant
6、ies 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, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if U
7、L 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 of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, ind
8、emnify, 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 while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this
9、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 affected item. The prior text for requirements that have been revised and that have a future effective date are
10、 located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. FEBRUARY 8, 2013 UL 789 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 8, 2013 UL 789 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORI
11、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 9, 2004 (Title Page Reprinted: February 8, 2013) 1 UL 789 Standard for Indicator Posts for Fire-Protection Service The First and Second editions were titled Standard for Indicator Posts and numbered UL 262C. First Editio
12、n March, 1931 Second Edition May, 1951 Third Edition June, 1966 Fourth Edition May, 1971 Fifth Edition January, 1975 Sixth Edition July, 1976 Seventh Edition July, 1982 Eighth Edition June, 1987 Ninth Edition September, 1993 Tenth Edition January 9, 2004 This ANSI/UL Standard for Safety consists of
13、the Tenth Edition including revisions through February 8, 2013. The most recent designation of ANSI/UL 789 as a Reaffirmed American National Standard (ANS) occurred on February 8, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date inf
14、ormation. 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 Standards for Safety are copyrighted by UL. Neither a pri
15、nted 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 LABORATORIES INC. ANSI/UL 789-2003 (R2013)UL COPYRIGHTED MATE
16、RIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 7, 2008 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTROD
17、UCTION 1 Scope .5 2 Components 5 3 Units of Measurement .6 4 Undated References 6 CONSTRUCTION 5 Barrels .6 6 Caps 7 7 Operating Stems 8 7.1 General .8 7.2 Underground types .8 8 Position Indicators 8 8.1 General .8 8.2 Rotating target mechanisms .9 8.3 Vertically moving target mechanisms 10 9 Exten
18、sion Rods 10 10 Handwheels and Wrenches 10 11 Locking and Sealing 10 12 Polymeric Materials and Nonmetallic Parts .11 PERFORMANCE 13 Strength of Parts Test .11 14 Elastomeric Parts (Except Gaskets) Test 12 15 Polymeric Parts Tests .12 15.1 Air oven aging test .12 15.2 Light and water test 13 15.3 10
19、00 cycle operation test 13 MARKING 16 Details .14 AUGUST 7, 2008 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 8, 2013 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 4UL
20、COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover indicator posts, including wall and underground types, for use in operating valves of the inside-screw pattern and for indicating the position of
21、the gates in such valves. Indicator posts are primarily intended for use with valves controlling water supplies to sprinkler, deluge, water spray, foam, and standpipe systems used in private re service where connections enter buildings. 1.2 Requirements for the installation and use of the indicator
22、posts covered by this standard are included in the following Standards of the National Fire Protection Association: a) NFPA 11, Low Expansion Foam and Combined Agent Systems; b) NFPA 13, Installation of Sprinkler Systems; c) NFPA 14, Installation of Standpipe and Hose Systems; and d) NFPA 24, Instal
23、lation of Private Fire Service Mains. 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 characteristi
24、c 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 incomplete in const
25、ruction 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. JANUARY 9, 2004 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE
26、 - UL 789 5UL 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. 4 Undated References 4.1 Any undat
27、ed 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. CONSTRUCTION 5 Barrels 5.1 The walls of a barrel shall be made of material having physical and corrosion resistant properties at least e
28、quivalent to one of the following: a) Gray iron extra-heavy soil pipe (0.25 inch nominal thickness) in accordance with the Standard Specication for Cast Iron Soil Pipe and Fittings, ASTM A74, for either the upper or lower barrel; b) Minimum 0.21-inch thick ductile iron in accordance with the Standar
29、d for Ductile Iron Pipe Centrifugally Cast, for Water, ANSI/AWWA C151/A21.51, for either the upper or lower barrel; c) Schedule 40 steel pipe for either the upper or lower barrel in accordance with Standard Specication for Pipe, Steel, Black, and Hot-Dipped, Zinc-Coated, Welded and Seamless, ASTM A5
30、3, and the Standard Specication for Electric-Resistance-Welded Steel Pipe, ASTM A135; d) Class 200 polyvinyl chloride (PVC) pipe in accordance with the Standard for Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4 inch through 12 inch for Water Distribution, AWWA C-900, for the lowe
31、r barrel of indicator posts for underground use. 5.2 Ferrous materials having wall thickness less than those specied in 5.1 and provided with a protective interior and exterior coating may be used when determined to be equivalent using comparative corrosion analysis. 5.3 The inside diameter shall be
32、 nominally 4 inches (102 mm) at any point throughout its length. The inside diameter at the bottom of the lower part shall be not less than 8 inches (203 mm) over the length required to provide for clearance to the valve bonnet when attached to the valve ange. 5.4 The length of a barrel for an under
33、ground valve shall be such that the middle of the target windows can be placed at least 30 inches (760 mm) above the bury line marked on the barrel. 5.5 If the length of a barrel for an underground valve is adjustable: a) The upper part shall extend below the ground a distance of not less than 6 inc
34、hes (152 mm); JANUARY 9, 2004 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL b) The means for connecting the upper and lower parts shall prevent dirt from entering inside the barrel. Mea
35、ns for dirt entrance prevention may include the use of an O -ring seal installed in a groove between the upper and lower parts of the barrel constructed to resist dislodgement; having the upper barrel part telescope over the lower barrel part with the top of the lower part extending above the bury l
36、ine; or the like; and c) The parts shall be clamped together by two 3/4 inch (19.1 mm) diameter mild-steel setscrews, complying with the Specication for Carbon Steel Forgings for Piping Components, ASTM A105/A105M, or having equivalent strength, placed one above the other in the upper part. The lowe
37、r part shall be arranged so as to prevent separation or rotation of the upper part. 5.6 Prevention of separation may be accomplished by providing on the lower part either deeply spotted holes for the ends of the setscrews or a series of horizontal ribs spaced the same distance apart as the setscrews
38、. Prevention of rotation may be accomplished by casting four vertical ribs on the exterior of the lower part. Setscrews may also be used to prevent separation and rotation. 5.7 The upper part of a barrel for underground service shall be constructed so that there is no projection, ange, taper, or rou
39、ghness by which the action of frost may lift the part. A bead, if used to mark the bury line, shall not be raised more than 1/8 inch (3.2 mm) on the casting. 5.8 An indicator post shall be provided with a base ange for connection to the indicator-post ange provided as part of the inside-screw gate v
40、alve. The indicator-post ange shall be drilled for four 5/8 inch (15.9 mm) diameter mild-steel bolts, complying with the Specication for Carbon Steel Forgings for Piping Components, ASTM A105/A105M, or having equivalent strength, placed at 90 degrees on a bolt circle of 10-1/2 inches (267 mm) for va
41、lves up to and including 14 inches (356 mm). 5.9 The barrel for a wall-mounted indicator post shall be provided with an integral ange for bolting to the outside of the wall. The ange shall provide for four 5/8 inch (15.9 mm) diameter mild-steel bolts, complying with the Specication for Carbon Steel
42、Forgings for Piping Components, ASTM A105/A105M, or having equivalent strength, placed at 90 degrees on a bolt circle of at least 10-1/2 inches (267 mm). The inside diameter of the barrel shall provide a minimum 1/2 inch (12.7 mm) clearance between moving parts and the barrel. 6 Caps 6.1 A cap shall
43、: a) Be of weatherproof construction; b) Be securely fastened to the barrel, such as by the use of two 1/2 inch (12.7 mm) diameter mild-steel bolts complying with the Specication for Carbon Steel Forgings for Piping Components, ASTM A105/A105M; c) Furnish a bearing complying with the requirements of
44、 7.1.1; and d) Provide means for lubrication of this bearing. JANUARY 9, 2004 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Operating Stems 7.1 General 7.1.1 An operating stem shall:
45、a) Turn freely in its bearing; b) Not become clamped to its bearing by locknuts; and c) Turn no matter what the position may be of any target nut, target, or other indicating mechanism. 7.1.2 The size and length of thread on the operating stem or stem nut for operation of a moving-target mechanism s
46、hall be such that the indicator post may be used interchangeably for all sizes of the particular make of valve for which the post is designed. 7.2 Underground types 7.2.1 An operating stem and stem nut shall be made of material having the physical and corrosion resistant properties at least equivale
47、nt to those complying with the Specication for Composition Bronze or Ounce Metal Castings, ASTM B62, Copper Alloy No. C83600, or the Specication for Free-Cutting Brass Rod, Bar, and Shapes for Use in Screw Machines, ASTM B16, brass or bronze, except that materials not inherently resistant to corrosi
48、on, but otherwise equivalent, may be used if sealed in a housing completely lled with a protective grease lubricant. A stem nut shall be cored at least 4 inches (102 mm) deep to t loosely over the extension rod. 7.2.2 The upper end of an operating stem nut shall be nished in a solid nut, 1-1/4 inche
49、s (31.8 mm) square by 1 inch (25.4 mm) high, unless otherwise specically ordered to have a different size and shape to t existing equipment. 7.2.3 The shape of the operating stem nut at the base of the nut shall form a cap of weatherproof construction over the bearing area in the post cap. 8 Position Indicators 8.1 General 8.1.1 An indicator post shall provide a means for visually indicating the OPEN and SHUT positions of a valve to which it is connected. The means provided s
