1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 404 Gauges, Indicating Pressure, for Compressed Gas ServiceUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL N
2、OT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Gauges, Indicating Pressure, for Compressed Gas Service, UL 404 Eighth Edition, Dated October 8, 2010 SUMMARY OF TOPICS This revision of ANSI/UL 404 includes revisions to 7.2 and 10.1 to prov
3、ide clarication and more details to explain the construction of pressure gauges. The new and/or revised requirements are substantially in accordance with Proposal(s) on this subject dated December 12, 2014. Text that has been changed in any manner or impacted by ULs electronic publishing system is m
4、arked 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. All rights reserved. No part of this publicati
5、on 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 without warranty of any kind, either expressed or implied, including but not limit
6、ed 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, loss of data, or any other damages arising out of the use of or the inability to us
7、e this Standard, even if UL 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 S
8、afety agree to defend, indemnify, 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.
9、 The requirements in this 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
10、 future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. FEBRUARY 11, 2015 UL 404 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL FEBRUARY 11, 2015 UL 404 tr2 No Text on This PageUL COPY
11、RIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 8, 2010 (Title Page Reprinted: February 11, 2015) 1 UL 404 Standard for Gauges, Indicating Pressure, for Compressed Gas Service The rst and second editions were titled High-Pressure Gas Gauges
12、 and the rst edition was numbered UL 252(b). First Edition March, 1948 Second Edition June, 1953 Third Edition May, 1973 Fourth Edition July, 1979 Fifth Edition June, 1993 Sixth Edition September, 1997 Seventh Edition January, 2005 Eighth Edition October 8, 2010 This ANSI/UL Standard for Safety cons
13、ists of the Eighth Edition including revisions through February 11, 2015. The most recent designation of ANSI/UL 404 as an American National Standard (ANSI) occurred on February 11, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date i
14、nformation. The Department of Defense (DoD) has adopted UL 404 on October 3, 1994. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals sh
15、ould 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 printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships,
16、and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 404-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 8, 2010 GAUGES, INDICATING PRESSUR
17、E, FOR COMPRESSED GAS SERVICE - UL 404 2 No Text on This PageUL COPYRIGHTED 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 CONSTRUCTION 5 General 5 6 Sizes 5
18、7 Dials and Pointers 5 8 Windows .6 9 Elastic Elements 6 10 Materials 6 11 Graduations .6 PERFORMANCE 12 General .6 13 Accuracy Test .7 14 Over-Pressure Test 7 15 Impulse Test 7 16 Internal Explosion Test .8 MARKING 17 General .8 OCTOBER 8, 2010 GAUGES, INDICATING PRESSURE, FOR COMPRESSED GAS SERVIC
19、E - UL 404 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover indicating pressure gauges of the elastic element type usually employed in the high-pressure side of regulators or reducing valves
20、used on compressed gas containers or cylinders of oxygen, hydrogen, nitrogen, and other gases. Such gauges usually have pressure ranges of 0 1500, 0 2000, 0 3000, 0 4000, 0 5000, or 0 6000 pounds per square inch (psi) (0 10.34, 0 13.78, 0 20.68, 0 27.56, 0 34.47, or 0 41.36 MPa). 2 Components 2.1 Ex
21、cept 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 the component in the
22、 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 performance capabilitie
23、s. 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 If a value for measurement is followed by a value in other units in parentheses, the rst
24、stated value is the requirement. 3.2 Unless otherwise indicated, all voltage and current values mentioned in this standard are root-mean-square (rms). OCTOBER 8, 2010 GAUGES, INDICATING PRESSURE, FOR COMPRESSED GAS SERVICE - UL 404 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
25、DISTRIBUTION WITHOUT PERMISSION FROM UL 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 General 5.1 The assembly and design of pressure
26、 gauges with regard to location of pressure connections, type of pressure connections, size of pressure connections, stop pins, outside diameters of shells and rings, outside diameters of cases, dial gures, graduations, and indicating pointers shall conform to the requirements for gauges in the Stan
27、dard for Gauges Pressure Indicating Dial Type Elastic Element, ANSI/ASME B40.1-91. 5.2 In addition to the foregoing, the following requirements for original calibration and accuracy, and calibration and accuracy following subjection to over-pressures and extended operation, as well as hazards attend
28、ant to bursting tests, shall apply. 6 Sizes 6.1 The nominal size of a gauge shall be the inside diameter of the case in inches measured at the face of the dial. 6.2 The size of a gauge shall be not less than 1-1/4 inches (31.75 mm). 7 Dials and Pointers 7.1 A dial shall be produced in a manner which
29、 will result in the dial having sharp lines for graduations and numerals. Methods found suitable include silvering and lacquering, etching and lling, photographic, and lithographic processes. 7.2 A pointer used on a resettable gauge provided with a removable lens so that it can be reset by the user
30、shall be so mounted on its staff as to provide for subsequent resetting without damage to the staff or pointer. 7.2 revised February 11, 2015 FEBRUARY 11, 2015 GAUGES, INDICATING PRESSURE, FOR COMPRESSED GAS SERVICE - UL 404 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIB
31、UTION WITHOUT PERMISSION FROM UL 8 Windows 8.1 A window shall be a transparent component that closes the front of the case. It shall be heat-treated glass, laminated glass, plain glass (commercial, single, or double strength plate or sheet), or plastic. 9 Elastic Elements 9.1 An elastic element shal
32、l be processed or seasoned to reduce or eliminate internal stresses resulting from the process of manufacture. 10 Materials 10.1 Pressure conning parts shall be made of material having strength, rigidity, and resistance to corrosion equivalent to painted or plated steel or aluminum, yellow brass, or
33、 bronze. 10.1 revised February 11, 2015 11 Graduations 11.1 The values of the minor, or smallest, graduations on the dial shall conform to those designated in Table 11.1. Table 11.1 Value of graduations Range, Graduations, pounds per square inch (kPa) pounds per square inch (kPa) 0 1500 0 10345 25 o
34、r 50 172 or 345 0 2000 0 13793 50 or 100 345 or 690 0 3000 and above 0 20690 and above 100 or 200 690 or 1379 PERFORMANCE 12 General 12.1 Representative samples of each size and pressure range of pressure gauges are to be subjected to the following tests. FEBRUARY 11, 2015 GAUGES, INDICATING PRESSUR
35、E, FOR COMPRESSED GAS SERVICE - UL 404 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 13 Accuracy Test 13.1 A pressure gauge in the as received condition, tested over the middle three-fths of its full scale range, with readings taken going
36、 both up and down, shall be accurate to within 3-1/2 percent of the maximum pressure shown on the dial. 13.2 The above tests are to be conducted using a properly calibrated dead-weight tester, test gauge, or the equivalent. During a test using a dead weight tester, the table with the superimposed we
37、ight is to be rotated by hand at approximately 100 revolutions per minute. 13.3 A test gauge shall be three times as accurate as the limits specied in 13.1 and shall otherwise comply with the requirements for test gauges detailed in the Standard for Gauges Pressure Indicating Dial Type Elastic Eleme
38、nt, ANSI/ASME B40.1-91. 13.4 During each test, readings are to be taken at not less than three points spaced at approximately equal intervals over the middle three-fths of the scale range and at the maximum point on the scale. 13.5 Six samples are to be tested for accuracy. After this test three sam
39、ples are to be used for the Over-Pressure Test, Section 14 and three samples are to used for the Impulse Test, Section 15. 14 Over-Pressure Test 14.1 Three samples from the accuracy test are to be subjected for a period of 3 hours to a pressure equal to 125 percent of the maximum scale value for a g
40、auge having a range of 3000 psi (20.68 MPa) or less and 112 percent for a gauge having a range exceeding 3000 psi. 14.2 One hour following the termination of the Over-Pressure Test the gauges are to be tested over the middle three-fths of its full scale range, with readings taken going both up and d
41、own. They shall be accurate to within 3-1/2 percent of the maximum pressure shown on the dial. 15 Impulse Test 15.1 Three samples from the accuracy test are to be subjected to 25,000 pulses of hydrostatic pressure between the limits of 200 psi (1.38 MPa) and 65 percent of the maximum scale value of
42、the gauge. 15.2 The test apparatus is to provide for mounting the gauge on a system of piping containing a water seal between the gauge and a system of air under pressure. The water pressure at the gauge is to be varied by automatically imposing and releasing air under pressure in the closed system
43、at the rate of 25 to 30 complete cycles per minute. 15.3 One hour following the termination of the Impulse Test the gauges are to be tested over the middle three-fths of its full scale range, with readings taken going both up and down. They shall be accurate to within 3-1/2 percent of the maximum pr
44、essure shown on the dial. OCTOBER 8, 2010 GAUGES, INDICATING PRESSURE, FOR COMPRESSED GAS SERVICE - UL 404 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 16 Internal Explosion Test 16.1 A gauge shall be so constructed that if bursts of the
45、 elastic element, or its means for joining occur, due to an internal explosion or other application of excessive pressure, no part of the gauge is propelled or thrown from the assembly. 16.2 The explosion test apparatus is to consist of a closed chamber having a tapped opening for the gauge connecto
46、r, and a breeching, ring, and safety mechanism to accommodate the ring and resultant pressure of an explosive charge. The charge is to consist of a smokeless gun powder in sufficient quantity to produce a pressure of 25,000 psi (172.3 MPa) in the free space provided by the chamber and the internal s
47、ections of the gauge under test. 16.3 Two samples are to be subjected to the test in 16.2. MARKING 17 General 17.1 A pressure gauge shall be marked with the following: a) The manufacturers or private labelers name or identifying symbol. b) A distinctive catalog number or equivalent identication to s
48、pecically identify the product. c) The units in which the scale is marked on the gauge face. d) The words USE NO OIL in prominent red letters on the face of a gauge for oxygen service. 17.2 If a manufacturer produces gauges at more than one factory, each gauge shall have a distinctive marking to identify it as the product of a particular factory. OCTOBER 8, 2010 GAUGES, INDICATING PRESSURE, FOR COMPRESSED GAS SERVICE - UL 404 8
