1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 789 Indicator Posts for Fire-Protection Service STANDARD FOR SAFETYUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MA
2、TERIAL NOT AUTHORIZED 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 of ANSI/UL 789 is being issued to update the title page to ree
3、ct reaffirmation of ANSI approval. 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 indicating the da
4、te 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 March 31, 2017. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or trans
5、mitted 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 warranties of merchantability or tness fo
6、r 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 UL or an authorized UL representati
7、ve 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, indemnify, and hold UL harmless from
8、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. MAY 25, 2017 UL 789 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZ
9、ED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 25, 2017 UL 789 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 9, 2004 (Title Page Reprinted: May 25, 2017) 1 UL 789 Standard for Ind
10、icator Posts for Fire-Protection Service The First and Second editions were titled Standard for Indicator Posts and numbered UL 262C. First Edition March, 1931 Second Edition May, 1951 Third Edition June, 1966 Fourth Edition May, 1971 Fifth Edition January, 1975 Sixth Edition July, 1976 Seventh Edit
11、ion July, 1982 Eighth Edition June, 1987 Ninth Edition September, 1993 Tenth Edition January 9, 2004 This ANSI/UL Standard for Safety consists of the Tenth Edition including revisions through May 25, 2017. The most recent designation of ANSI/UL 789 as a Reaffirmed American National Standard (ANS) oc
12、curred on May 25, 2017. ANSI approval for a standard 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 Collaborati
13、ve Standards Development System (CSDS) at https:/. 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 exc
14、lusive property of UL. COPYRIGHT 2017 UNDERWRITERS LABORATORIES INC. ANSI/UL 789-2003 (R2017)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 25, 2017 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 2 No Text on This PageUL COPYRIGHT
15、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 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 In
16、dicators 8 8.1 General 8 8.2 Rotating target mechanisms .9 8.3 Vertically moving target mechanisms .10 9 Extension 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
17、 Gaskets) Test .12 15 Polymeric Parts Tests 12 15.1 Air oven aging test .12 15.2 Light and water test .13 15.3 1000 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
18、DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 8, 2013 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 4UL 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
19、and underground types, for use in operating valves of the inside-screw pattern and for indicating the position of 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 pri
20、vate re service where connections enter buildings. 1.2 Requirements for the installation and use of the indicator 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,
21、 Installation of Sprinkler Systems; c) NFPA 14, Installation of Standpipe and Hose Systems; and d) NFPA 24, Installation 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
22、. 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 in this standard. 2.3 A component shall be used in accord
23、ance 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, such as certain temperatures not exceeding specied limits,
24、 and shall be used only under those specic conditions. JANUARY 9, 2004 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - 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
25、 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. CONSTRUCTION 5 Barrels
26、 5.1 The walls of a barrel shall be made of material having physical and corrosion resistant properties at least equivalent 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
27、 A74, for either the upper or lower barrel; b) Minimum 0.21-inch thick ductile iron in accordance with the Standard 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 acco
28、rdance with Standard Specication for Pipe, Steel, Black, and Hot-Dipped, Zinc-Coated, Welded and Seamless, ASTM A53, 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 (P
29、VC) Pressure Pipe and Fabricated Fittings, 4 inch through 12 inch for Water Distribution, AWWA C-900, for the lower 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 m
30、ay be used when determined to be equivalent using comparative corrosion analysis. 5.3 The inside diameter shall be 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
31、provide for clearance to the valve bonnet when attached to the valve ange. 5.4 The length of a barrel for an underground 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
32、underground valve is adjustable: a) The upper part shall extend below the ground a distance of not less than 6 inches (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 FRO
33、M UL b) The means for connecting the upper and lower parts shall prevent dirt from entering inside the barrel. Means 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
34、 upper barrel part telescope over the lower barrel part with the top of the lower part extending above the bury line; 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 C
35、omponents, ASTM A105/A105M, or having equivalent strength, placed one above the other in the upper part. The lower 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 h
36、oles for the ends of the setscrews or a series of horizontal ribs spaced the same distance apart as the setscrews. 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
37、part of a barrel for underground service shall be constructed so that there is no projection, ange, taper, or roughness 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 b
38、e provided with a base ange for connection to the indicator-post ange provided as part of the inside-screw gate valve. 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
39、A105/A105M, or having equivalent strength, placed at 90 degrees on a bolt circle of 10-1/2 inches (267 mm) for valves 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 shal
40、l provide 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 at least 10-1/2 inches (267 mm). The inside diameter of the barrel
41、 shall provide a minimum 1/2 inch (12.7 mm) clearance between moving parts and the barrel. 6 Caps 6.1 A cap shall: 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 Carb
42、on Steel Forgings for Piping Components, ASTM A105/A105M; c) Furnish a bearing complying with the requirements of 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 REPR
43、ODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 7 Operating Stems 7.1 General 7.1.1 An operating stem shall: 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
44、.1.2 The size and length of thread on the operating stem or stem nut for operation of a moving-target mechanism shall 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 ste
45、m and stem nut shall be made of material having the physical and corrosion resistant properties at least equivalent 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 Shape
46、s for Use in Screw Machines, ASTM B16, brass or bronze, except that materials not inherently resistant to corrosion, 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
47、 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 inches (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 t
48、he 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 shall co
49、nsist of words appearing on movable targets indicating OPEN and SHUT positions or provide equivalent visual indication of the valve position when viewed from at least two positions 180 degrees apart. 8.1.2 The mechanical or other means used for positioning the visual indicators shall be operated in a manner equivalent to that obtained by gearing to the operating stem or stem nut of the valve. JANUARY 9, 2004 INDICATOR POSTS FOR FIRE-PROTECTION SERVICE - UL 789 8UL COPYRIGHTED MATERIAL
