1、AN AMERICAN NATIONAL STANDARD Hydrants for Utility and Maintenance Use ANSI/ASME A112.21.3M - 1985 (REVISION OF ANSI A112.21.3 - 1976) . - _ REAFFIRMED 1995 FOR CURRENT COMMIITEE PERSONNEL PLEASE SEE ASME MANUAL AS1 1 SPONSORED AND PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Eng
2、ineering Center 345 East 47th Street New York, N. Y. 1001 7 Date of Issuance: October 31, 1985 This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda or written interpretations of the requirements of this Standard issued to this Edition. Thus
3、code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Consensus Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The pr
4、oposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry, academia, regulatory agencies, and the public-at-large. ASME does not “approve,“ “rate,“ or “endorse“ any item, construction, proprietary device, or activ
5、ity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable Letters Patent, nor assume any su
6、ch liability. Usersof a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s) or person(s) affiliated with industry is n
7、ot to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers. No part of this do
8、cument may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Copyright 0 1985 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. FOREWORD (This Foreword is not part of ANSI/ASME A1 12.2
9、1.3-1985.) In the broadest definition, a hydrant, as covered by this Standard, is a device with a water supply shut-off valve and with a means to connect a hose in a safe and sanitary manner. Hy- drants covered herein serve as utility hose terminals for general building and grounds main- tenance. Th
10、is Standard does not cover fire hydrants (plugs). As the building industry became more sophisticated, it was apparent that convenient water supply was necessary at various locations in the building walls and in the grounds surrounding the buildings. This requirement spurred the development of hydran
11、ts for both wall and ground installations. Two general categories were established: (1) nonfreeze (frost proof) hydrants designed to be installed in areas which are subject to freezing temperatures; (2) hydrants for wall and ground installations in areas where freezing temperatures are not encounter
12、ed. Hydrants are equipped with removable operating keys or handles to discourage misuse and vandalism. Many hydrants installed directly in the walls of buildings are equipped with attractive func- tional boxes to enclose the hydrant head, thereby concealing the nozzle so that it presents neither a d
13、ispleasing appearance nor an obstruction on the wall. Ground or yard hydrants are similarly equipped to conceal and protect the nozzles. Post hydrants were developed to provide easy access to water supply where concealment is not a factor. The American National Standards Committee A1 12 was organize
14、d July 27, 1955 for the standardization of plumbing materials and equipment. The first organizational meeting was held on July 22, 1958. At the meeting on May 1, 1964, Panel No. 21 was created to establish stan- dards on roof drains, floor drains, backwater valves, and other drainage specialties. It
15、s scope was as follows: the recommendation of suitable existing standards, in cooperation with interested sponsors, or the development of adequate new standards as are needed for roof drains, floor drains, and other drains as used or installed in plumbing systems. The Committee has since been reorga
16、nized as an ASME Standards Committee. This Standard was revised and approved by Panel 21, the ASME A1 12 Standards Committee, and ASME. Subsequently this modified version was adopted by the American National Stan- dards Institute on January 25, 1985. 1ll . Intentionally left blank AMERICAN NATIONAL
17、STANDARDS COMMITTEE A112 Standardization of Plumbing Materials and Equipment (The following is the roster of the Committee at the time of approval of this Standard.) OFFICERS J. C. Church, Chairman C. E. Lynch, Secretary COMMITTEE PERSONNEL AIR CONDITIONING AND REFRIGERATION INSTITUTE L. P. Benua, E
18、BCO Manufacturing Co., Columbus, Ohio R. J. Denny, Alternate, Air Conditioning and Refrigeration Institute, Arlington, Virginia AMERICAN IRON AND STEEL INSTITUTE G. T. Rochford, Jr., American Iron and Steel Institute, Washington, D.C. E. J. Enright, Alternate, Raytown, Missouri AMERICAN SOCIETY OF M
19、ECHANICAL ENGINEERS R. V. Benazzi, Juros, Baum it anticipates the use of other mate- rials of comparable performance. 4.1 Castings The items covered in this Standard shall be of the ma- terial specified, suitable for installation and service in the place specified, and shall meet all applicable requ
20、ire- ments and standards given herein. All ca.stings for hy- drant heads, boxes, and valve housings shall be sound, free of blow holes (holes in casting due to air or gas in the metal or mold), cold shuts (casting d.efects formed when two streams of metal become so cold they do not fuse upon meeting
21、, Le., incomplete casting), and other imperfections adversely affecting casting quality, and shall be of uniform wall thickness and true to pattern. They shall also be clean and free of fins cprojections on castings due to imperfect joints). (a) Chst Iron. Cast iron castings shall conform to ANSI/AS
22、TM Specification A 48-1976, Class 25. E ad!d Alddns JalEM 40 adAi pue az!s UO 6u!puadap Sa!JEA uo!i3auuoa lalul 0 aHVaNVIS 1VNOIlVN NV3lH3VUV NV 986L-VUGLzZL LV 3VUSV/ISNV ANSIIASME A1 12.21.3M-1985 AN AMERICAN NATIONAL STANDARD HYDRANTS FOR UTILITY AND MAINTENANCE USE FIG. 2A RECOMMENDED INSTALLATI
23、ON WITH VALVE BEHIND BUILDING WALL IN HEATED AREA TO PREVENT FREEZING (EXPOSED HEAD) FIG. 2B RECOMMENDED INSTALLATION WITH VALVE BEHIND BUILDING WALL in1 HEATED AREA TO PREVENT FREEZING (CONCEALED HEAD) FIG. 2C RECOMMENDED INSTALLATION IN WALLS WHERE THERE IS NO DANGER OF FREEZING 4 HYDRANTS FOR UTI
24、LITY AND MAINTENANCE USE G. ANSIIASME A1 12.21.3M-1985 AN AMERICAN NATIONAL STANDARD FIG. 2D RECOMMENDED INSTALLATION (PLAN VIEW) WITH VALVE BEHIND BUILDING WALL IN HEATED AREA TO PREVENT FREEZING FIG. 2E RECOMMENDED INSTALLATION IN WALLS WHERE THERE IS NO DANGER OF FREEZING 5 ANSI/ASME A1 12.21.3M-
25、1985 AN AMERICAN NATIONAL STANDARD FIG. 2F RECOMMENDED INSTALLATION WITH VALVE BELOW FROST LINE TO PREVENT FREEZING (BOX TYPE) HYDRANTS IFOR UTI LlTY AND MAINTENANCE USE FIG. 2G RECOMMENDED INSTALLATION WI VALVE BELOW FROST LINE TO PREVENT FREEZING (POST TYPE) TH FIG. 3A THREAD OR SOLDER UNION ELBOW
26、 6 HYDRANTS FOR UTILITY AND MAINTENANCE USE H Thread ANSI/ASME A112.21.3M-1985 AN AMERICAN NATIONAL STANDARD Solder Thread FIG. 3B STRAIGHT INLET CONNECTION, INTEGRAL WITH VALVE HOUSING Thread Thread and solder FIG. 3C COMBINATION STRAIGHT OR UNION ELBOW Drain FIG. 3E THREAD OR SOLDER ELBOW FIG. 3D
27、GROUND HYDRANT INLET CONNECTION ANSI/ASME A112.21.3M-1985 AN AMERICAN NATIONAL STANDARD HYDRANTS FOR UTILITY AND MAINTENANCE USE FIG. 3F STRAIGHT AND ANGLE OUTLET CONNECTION (b) Bronze. Bronze castings shall conform to the ASTM specification for leaded red brass and leaded semi- red brass sand casti
28、ngs, B 584-85a, and be copper alloys C83600, C83800, or C84400. (c) Nickel Bronze. Nickel bronze castings shall con- form to the ASTM specification for leaded nickel brass (leaded nickel silver) and leaded nickel bronze (leaded nickel silver) sand castings B 584-85a, and be copper al- loys C97300, C
29、97600, or C97800. (d) Red Brass. Red brass casings shall be commercial grade red brass pipe conforming to ASTM Specification B 43-84a. (e) Brass Internal Parts. Brass internal parts other than castings shall conform to ASTM B 16-85. (f) Washers and Packings. Washers and packings shall be of sufficie
30、nt design and quality as to ensure leak- proof joints and be capable of providing satisfactory field service. 4.2 Finishes In all cases where parts are to be coated or plated, they shall be treated as required and cleaned to provide suitable surface for proper bonding of the finish. (a) Paint Coatin
31、gs. Iron castings shall be cleaned and coated with a suitable paint, lacquer, or synthetic coat- ing of quality to provide protection against rusting of ferrous surfaces during normal handling and warehousing prior to installation. (b) Cadmium Plate. After preplating and cleaning, parts shall be giv
32、en a commercial grade cadmium plate. (This applies only to parts not coming into contact with (c) Chrome Plating. Parts that are plated shall be in flow.) accordance with the following requirements: Chromium Plating, Where Used Minimum thickness of significant surfaces Copper (Use optional depending
33、 on base material) Nickel 0.00010 in. (2.54-X mm) Chromium 0.00001 in. (2.54 X mm) 4.3 Polishing (a) Rough Bronze. Castings shall be cleaned but left (b) Polished Bronze. Castings shall be polished to a (c) Polished Nickel Bronze. Castings shell be polished (d) Satin Chrome Plate. Castings shall be
34、polished (e) Polished Chrome Plate. Castings shall be polished unfinished. No. 4 finish or a satin finish. to a No. 4 finish or a satin finish. after plating to a No. 4 finish. after plating to a No. 7 finish. 5 VARIATIONS The optional features listed are stated here to identify the variations avail
35、able for the different applications. 5.1 Wall Clamp 5.2 Vacuum Breakers (a) Removable hose end type (adaptor type) (b) Integral hose end type (c) Hose connection vacuum breakers; are to con- form with ANSIlASSE Standard No. 101 1-1982. (6) Hydrants with integral hose end type vacuum breakers are to
36、conform with ANSI/ASSE Standard No. 1019-1978. 8 HYDRANTS FOR UTILITY AND MAINTENANCE USE ANSIIASME A1 12.21.3M-1985 AN AMERICAN NATIONAL STANDARD 6 TESTING AND OPERATION 6.1 Water Test Each hydrant shall be factory water tested to ensure reliability of function, including going through a closed to
37、full open cycle, and all castings and casings shall be watertight; valve closure force is not to exceed 15 in.-lb (1.7 Nem). Nonfreeze hydrants shall be tested to ensure complete evacuation of the unit when fully closed. Fail- ure in water test shall be cause for rejection of the hy- drant. It is th
38、e manufacturers option to either scrap the hydrant or rework to comply. 6.2 Proof Test A representative production specimen of each type or model of hydrant shall be subjected to the following proof tests. Failure of the unit to pass any of the tests outlined in this paragraph shall be cause for rej
39、ection. In the event of such failure, the manufacturer is to be pro- vided with the specific details thereof, with the option to submit the specimen for qualification retest after corrections are made. (a) Bursting. Fittings shall withstand for 1 min., with- out failure or distortion, a hydrostatic
40、pressure of 1000 psi (6890 Ha) applied internally. (b) Bending. Any cross section of the waterway of a cast fitting shall withstand a bending moment of 65 ft-lb (88.1 N.m) without fracture. The force shall be applied not closer to the cross section being tested than twice the major diameter of the s
41、ection. (c) Joints. All factory assembled joints in systems supplying water shall be so designed that they can be securely made to withstand a hydrostatic test of 200 psi (1380 Wa) and a bending test of 65 ft-lb (88.1 N.m). Each joint to be hydrostatically tested shall be connected to a supply line
42、of the same basic size as that of the joint with a pressure gage not less than 1 ft (305 mm) from the joint. Hydrostatic pressure shall be applied for a period of not less than 5 min. Bending tests shall be applied according to (b) above. (d) Discharge. Hydrants shall be connected to smooth pipe at
43、least 3 ft (914 mm) long. The pressure gage is to be placed 6 in. (152 mm) upstream from the hydrant in- let. Test pipe shall be of the same nominal size as the hy- drant inlet. The test shall be made with cold water. The recommended inlet pressure at the gage shall be 20 psi (137.9 Ma). When flowin
44、g, the hydrant shall be tested in the fully open position and no hose, adaptor, or vac- uum breaker should be attached. Where a vacuum breaker device is included, refer to para. 5.2. (e) Capacity. The rate of discharge (US. gal/min) using the test conditions of (d) above shall be not less than the r
45、ates listed in Table 2. TABLE 2 DISCHARGE CAPACITY TEST Size, Minimum Discharge, Type in. (mm) gal/min (m3/s) Wall % (19.05) 8 (5.05 X 1 (25.4) 15 (9.46 X Ground % (19.05) IO (6.31 X 1 (25.4) 18 (11.4 X 1% (31.75) 30 (18.9 X 1% (38.1) 40 (25.2 X 2 (50.8 mm) 70 (44.2 X TABLE 3 LIFE TEST TY pe Size, i
46、n. (mm) Cycles Wall %, 1 (19.05.25.4) 20,000 Ground % (19.05) 20,000 1 (25.4) 20,000 1% (31.75) 20,000 1 % (38.1 ) 20,000 2 (50.8) 20,000 (f) Life Test. Moving parts of hydrants shall be sub- jected to life test cycles as shown in Table 3. One cycle is a full open to full closed operation. The cycle
47、 rate is 60/hr. 7 GENERAL REQUIREMENTS 7.1 Replacement Parts Hydrants shall be designed so that wearing parts may be replaced after installation, without removing the de- vice from the system. 7.2 Seating Members (a) Seat disk (washer) design shall incorporate a re- straining wall so that the disk w
48、ill not swell or distort. (b) Valve components, disk arrangements, or plungers shall be so made that they will not vibrate or loosen in service and are replaceable. 7.3 Marking Each hydrant shall be marked with the manufacturers name or registered trademark or, in the case of private brand sales, th
49、e name or trademark of the customer for whom the unit was manufactured. 9 APPENDIX I METRIC (SI) CONVERSION TABLE (This Appendix is not a part of ANSI/ASME A1 12.21.3M-1985 and is included for information only.) t, = tf - 32/1.8 1 in. = 25.4 mm 1 psi = 6.89 kPa 1 ft-lb = 1.36 N.m 1 in.-lb = 0.113 N-m 1 gal (U.S. liquid)/min = 0.0631 L/s 10 Intentionally left blank J0005 1 1
