1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 536 Flexible Metallic HoseUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODU
2、CTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Flexible Metallic Hose, UL 536 Tenth Edition, Dated December 5, 2014 Summary of Topics This new edition of UL 536 includes the following changes: 1) Revisions to Scope; 2) Editorial revisions; 3) Revisions required by scope
3、change deleting liquid applications; 4) Clarication of minimum hose length sample requirement; 5) Clarication of Hydrostatic Strength Test method; 6) Clarication of Vibration Test method; 7) Clarication of Flexure Test method; 8) Clarication of Tension Test method; 9) Clarication of Torsion Test met
4、hod; 10) Editorial clarication of Temperature, Flame, Compression and Bending Tests; 11) Revision of the Moist Ammonia-Air Stress Cracking Test; and 12) Marking for assemblies with other than NPT threads. The new and revised requirements are substantially in accordance with Proposal(s) on this subje
5、ct dated April 18, 2014 and October 17, 2014. 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 otherwise without prior permission of UL. UL provides this Stand
6、ard 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, consequential, indirect or similar damages, including loss of prots, lost
7、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 liability for any damage ever exceed the price paid for this Standard,
8、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 reasonable attorneys fees) resulting from any error or deviation int
9、roduced 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 Standard having future effective dates as indicated in the note followi
10、ng 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. DECEMBER 5, 2014 UL 536 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR
11、IBUTION WITHOUT PERMISSION FROM UL DECEMBER 5, 2014 UL 536 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 5, 2014 1 UL 536 Standard for Flexible Metallic Hose First Edition August, 1958 Second Edition Januar
12、y, 1963 Third Edition July, 1970 Fourth Edition February, 1972 Fifth Edition December, 1976 Sixth Edition August, 1984 Seventh Edition April, 1989 Eighth Edition December, 1993 Ninth Edition July, 1997 Tenth Edition December 5, 2014 Comments or proposals for revisions on any part of the Standard may
13、 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 printed nor electronic copy of a Standard should be altered in any way. All of U
14、Ls Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2014 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 5, 20
15、14 FLEXIBLE METALLIC HOSE - UL 536 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 General 5 2.1 Components .5 2.2 Units of measurement .5 2.3 Undated references .5 CONSTRUCTION 3 Mate
16、rials .5 4 Assembly 6 PERFORMANCE 5 General 7 6 Hydrostatic-Strength Test 8 7 Vibration Test 8 8 Flexure Test 9 9 Tension Test .9 10 Torsion Test .10 11 Temperature Test .11 12 Flame Test .11 13 Compression Test 12 14 Bending Test .12 15 Moist Ammonia-Air Stress Cracking Test 12 MANUFACTURING AND PR
17、ODUCTION TESTS 16 General 13 MARKING 17 General 13 DECEMBER 5, 2014 FLEXIBLE METALLIC HOSE - UL 536 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover exible metallic hose having a nominal insi
18、de diameter of not more than 4 inches intended for use in piping systems carrying compressed gases, such as anhydrous ammonia, and combustible fuel gases such as natural gas, liqueed petroleum gas, propane, and butane, at pressures not exceeding 500 psig (3.45 MPa) and temperatures not greater than
19、450F (232C) or lower than minus 40F (minus 40C). Flexible metallic hose is supplied with end ttings. 1.2 Flexible metallic hose is intended for aboveground applications and for underground applications not involving contact with soil. 1.3 Flexible metallic hose is not considered a substitute for sta
20、ndard pipe or tubing and its use should be conned to applications where exible connections cannot be avoided. 1.4 Flexible metallic hose should not be subjected to excessive torsion, tension, compression, or bending stresses and should be protected against physical damage and ignition sources. 1.5 T
21、his standard does not apply to hose connectors used in natural gas processing plants, reneries, petrochemical plants, marine terminals, or gas-transmission and distribution-piping systems. 1.6 These products have not been evaluated for use after res, natural disasters such as earthquakes, or excessi
22、ve physical damage beyond the expected assembly, installation and uses as identied in these requirements. 1.7 These products are intended to be periodically inspected and maintained for continued service, or taken out of service if necessary by qualied persons in accordance with industry recommended
23、 practices and/or the manufacturers instructions. 1.8 Products covered by this standard are intended to be installed and used in accordance with the National Fuel Gas Code, NFPA 54/ANSI Z223.1, the Liqueed Petroleum Gas Code, NFPA 58, and applicable Federal and State regulations for gas piping. 1.9
24、This standard does not cover the following: a) Gas appliance hose connectors for handling fuel gases at 5 psig (34.5 kPa) or less, which is covered by Metal Connectors for Gas Appliances, ANSI Z21.24; b) Portable outdoor cooking appliance fuel hose, which is covered by Gas Hose Connectors for Portab
25、le Outdoor Gas-Fired Appliances, ANSI Z21.54; c) LP-Gas and natural gas delivery hose or fuel supply systems, which is covered by the Standard for Pigtails and Flexible Hose Connectors for LP-Gas, UL 569 and the Standard for LP-Gas Hose, UL 21; d) Underground piping products for liquid fuels, which
26、is covered by the Outline of Investigation for Metallic Underground Fuel Pipe, UL 971A; e) Flexible connector piping for liquid fuels, which is covered by the Outline of Investigation for Flexible Connector Piping for Fuels, UL 2039; DECEMBER 5, 2014 FLEXIBLE METALLIC HOSE - UL 536 4UL COPYRIGHTED M
27、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL f) Motor fuel dispensing hose, which is covered by the Standard for Hose and Hose Assemblies for Dispensing Flammable Liquids, UL 330. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component o
28、f a product covered by this standard shall comply with the requirements for that component. 2.1.2 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
29、 b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are intended f
30、or use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.2 Units of measurement 2.2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate informatio
31、n. 2.3 Undated references 2.3.1 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 3 Materials 3.1 All parts of exible metallic hose shall be metal. 3.2 As ammonia c
32、ontaining minute quantities of water will react rapidly with copper, zinc, tin, and many alloys, especially those of copper base, only iron, steel, and nonferrous alloys shown to be acceptable for ammonia service shall be used for exible metallic hose intended for anhydrous ammonia service. 3.3 Flex
33、ible metallic hose shall be constructed to resist the effects of external re. If soldering or brazing is used in the construction of the hose, the ller material shall have a melting point exceeding 1000F (538C). Such hose shall be fabricated in lengths, measured between couplings, of not more than 6
34、0 inches (1.52 m). DECEMBER 5, 2014 FLEXIBLE METALLIC HOSE - UL 536 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.4 A part shall be resistant to atmospheric corrosion and attack by the gas it may contact during intended service if the c
35、orrosion of such a part may permit leakage. Ferrous materials of the thickness and intended for the applications specied in Table 3.1 are considered acceptable when uncoated. Table 3.1 Thickness of uncoated nonstainless ferrous materials Kind of gas in contact with material Minimum thickness Sheet m
36、etal, Castings, inches (mm) inches (mm) Manufactured and natural fuel gases 0.068 1.73 3/16 4.8 LP-Gas at pressure above 1 psig (6.9 kPa) 0.125 3.18 1/4 6.4 Anhydrous ammonia 0.125 3.18 1/4 6.4 3.5 Cadmium plating shall not be less than 0.0003 inch (0.008 mm) thick, and zinc plating shall not be les
37、s than 0.0005 inch (0.013 mm) thick, except on parts where threads constitute the major portion of the area, in which case the cadmium or zinc plating shall not be less than 0.00015 inch (0.0038 mm) thick. See 3.2. 3.6 A gas containing part shall be made of material having a melting point (solidus t
38、emperature) higher than 1000F (538C) and a tensile strength not less than 10,000 psi (69 MPa) at 400F (204C). 4 Assembly 4.1 One end of each length of hose shall terminate in a permanently attached pipe ange, separable coupling, or union to facilitate connection without twisting the hose. The other
39、end of each length shall be similarly equipped or shall terminate in a screwed or anged tting. 4.2 Pipe threads shall be in accordance with the Standard for Pipe Threads, General Purpose (Inch), ANSI/ASME B1.20.1. Exception: Flexible metal hose which incorporate other than NPT type threads shall be
40、permitted provided the pipe threads comply with a national pipe thread standard and the thread type is marked on the hose. 4.3 Flanges of ange-type hose connections shall comply with the respective American National Standard for pipe anges and anged ttings covering the material from which they are m
41、ade. DECEMBER 5, 2014 FLEXIBLE METALLIC HOSE - UL 536 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE 5 General 5.1 Flexible metallic hose is to be tested on the following basis consistent with the intended use of the product: a
42、) Size or diameter. b) Minimum length. c) Minimum radius of bend. d) Maximum rated pressure. 5.2 The radius of bend to be employed for tests is to be the minimum specied by the manufacturer if less than those specied in Table 5.1. Otherwise, the values specied in Table 5.1 are to apply. Table 5.1 Ra
43、dius of bend for tests Nominal inside diameter, Bending radius (to centerline of hose), inches (mm) inches (mm) 1/4 6.4 3 76 5/16 7.9 4 102 3/8 9.5 5 127 1/2 12.7 6 152 3/4 19.1 8 203 1 25.4 10 254 1-1/4 31.8 13 330 1-1/2 38.1 16 406 2 50.8 20 508 2-1/2 63.5 25 635 3 76.2 31 787 4 101.6 42 1067 5.3
44、In the tests, if samples of each diameter are specied and the product is made in more than four diameters, the samples may be limited to four diameters considered to be representative of the line. If samples are specied for tests involving bending of the sample, the length of sample is to be such th
45、at the hose may be bent over an arc of at least 45 degrees with the radius of curvature designated for the test. If samples are specied to be the shortest, they are to be prepared using the minimum length to be designated by the manufacturer as indicated in 5.1(b) or the shortest length the test equ
46、ipment is capable of testing, whichever is longer. Tests are generally to be conducted in the order in which they are presented, using new samples for each test. If a manufacturer desires to reduce the number of samples, tests such as the Temperature Test, Section 11, and Flame Test, Section 12, may
47、 be conducted using samples previously subjected to other tests, such as the Hydrostatic-Strength Test, Section 6. DECEMBER 5, 2014 FLEXIBLE METALLIC HOSE - UL 536 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Hydrostatic-Strength Test
48、6.1 A hose assembly of length sufficient to make a 90 degree bend based on the radius of curvature as specied in 5.2 and Table 5.1 is to be used in this test. The hose shall not leak nor rupture when subjected for 1 minute to a hydrostatic pressure equivalent to ve times its maximum rated pressure.
49、6.2 One sample of each diameter of a length acceptable for bending in accordance with 5.2 is to be used in this test. The sample is to be installed in a straight line, with one end attached to the pressure source and other end plugged and free. 6.3 The pressure is to be uniformly raised to 1-1/2 times rated pressure and maintained at that pressure for 1 minute. The hose is then to be bent 90 degrees with a radius of curvature as specied in 5.2 and the pressure maintai
