1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 407 Manifolds for Compressed GasesUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER
2、 REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Manifolds for Compressed Gases, UL 407 Seventh Edition, Dated June 18, 2004 Summary of Topics This revision of ANSI/UL 407 is being issued to reaffirm approval as an American National Standard. No changes in requirem
3、ents are involved. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. The revisions are substantially in accordance with Proposal(s) on this subject dated February 15, 2013 and April 12, 2013. All rights reserved. No
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8、hasers 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 following the affected item. The prior text for requirements that have been
9、revised and that have a future effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice. MAY 7, 2013 UL 407 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MAY 7, 2013 UL 407 tr2 No Text on This
10、PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JUNE 18, 2004 (Title Page Reprinted: May 7, 2013) 1 UL 407 Standard for Manifolds for Compressed Gases The rst, second and third editions were titled High-Pressure Gas Manifolds. First Edit
11、ion December, 1952 Second Edition October, 1967 Third Edition October, 1972 Fourth Edition April, 1978 Fifth Edition July, 1993 Sixth Edition October, 1997 Seventh Edition June 18, 2004 This ANSI/UL Standard for Safety consists of the Seventh Edition including revisions through May 7, 2013. The most
12、 recent designation of ANSI/UL 407 as a Reaffirmed American National Standard (ANS) occurred on May 7, 2013. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. 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 2013 UNDERWRITERS LABORATORIES INC. ANSI/UL 407-2004 (R2013)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSI
15、ON FROM UL MAY 7, 2013 MANIFOLDS FOR COMPRESSED GASES - UL 407 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 4 2.1 Components .4 2.2 Units of measurement .5 2.3 Undated refer
16、ences .5 3 Types .5 4 Installation and Operating Instructions .6 CONSTRUCTION 5 General 6 6 Manifolds for Acetylene 7 6.1 General .7 6.2 Back-pressure seal assembly 7 6.3 Flash arrester 8 7 Manifolds for Oxygen 8 8 Manifolds for Fuel Gases Other Than Acetylene 8 9 Manifolds for Nitrogen, Carbon Diox
17、ide, Air, and Inert Gases .8 10 Manifolds for Nonammable Medical Gases .8 10.1 General 8 10.2 Change-over device and operating alarm control 9 10.3 Lead couplings 9 MANUFACTURING AND PRODUCTION TESTS 11 General .9 12 Manifolds for Acetylene 10 13 Manifolds for Oxygen 10 MARKING 14 General 10 JUNE 18
18、, 2004 MANIFOLDS FOR COMPRESSED GASES - UL 407 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover equipment for manifolding high-pressure gas cylinders to supply gas for various industrial and
19、commercial applications. Cylinders are manifolded for the purpose of centralizing the gas supply, to provide a continuous supply of gas, or to provide gas at a rate in excess of that which may be obtained from a single cylinder. 1.2 Manifolds for services other than for nonammable medical gases are
20、intended to be installed and used in accordance with the Standard for the Design and Installation of Oxygen-Fuel Gas Systems for Welding, Cutting, and Allied Processes, NFPA 51. Those for nonammable medical gases are intended to be installed and used in accordance with the Standard for Healthcare Fa
21、cilities, NFPA 99. 1.2 revised June 18, 2004 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of 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
22、 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. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic compo
23、nents 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, and shall be used only under those specic conditions. 2.1.5 A component, as assemble
24、d as part of a manifold, shall comply with the requirements for the construction, performance, and use for that component. JUNE 18, 2004 MANIFOLDS FOR COMPRESSED GASES - UL 407 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.2 Units of me
25、asurement 2.2.1 If a value for measurement is followed by an equivalent value in other units in parentheses, the rst stated value is the requirement. 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 referr
26、ing to the latest edition of that code or standard. 3 Types 3.1 Five types of service are covered by these requirements: a) Acetylene; b) Oxygen; c) Fuel gases other than acetylene; d) Nitrogen, carbon dioxide, air, and inert gases; and e) Nonammable medical gases. Manifolds and parts are to be used
27、 only for the gas or gases for which they are designed. 3.2 Stationary manifolds are those which consist essentially of a wall- or oor-supported header provided with ttings for connection of cylinders by means of leads. One or more permanently mounted regulators serve to reduce and regulate the pres
28、sure of the gas from the cylinders to the point of consumption. 3.3 Portable manifolds contemplated by these requirements are of two types: a) In one type the gas passes from the connected cylinders through individual leads to a single common coupler block, and from there through a single pressure-r
29、educing regulator to the consuming device. b) In a second type the cylinders are connected by means of coupler tees attached to the shutoff valve of each cylinder. Gas from each cylinder passes through the coupler tee and joins the main stream owing through a common line composed of leads joining co
30、upler tee to successive coupler tee. From there the gas passes through a single pressure-reducing regulator to the consuming device. JUNE 18, 2004 MANIFOLDS FOR COMPRESSED GASES - UL 407 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4 Ins
31、tallation and Operating Instructions 4.1 Printed instructions covering all essential items commonly requiring attention in the installation, operation, and maintenance of the manifold shall be furnished with each manifold when shipped. CONSTRUCTION 5 General 5.1 Cast iron and other castings having l
32、ow tensile strength or low ductile characteristics shall not be used in the construction of manifold parts handling gas at cylinder pressure. 5.2 Joints in manifolds shall be made up using unions or shall be threaded, welded, brazed, or of the socket type using a brazing alloy having a melting point
33、 exceeding 1000F (538C). 5.3 Gaskets shall not be used for making up joints in the manifold. 5.4 Each manifold shall be designed for attachment of one or more compressed-gas regulators for controlling the pressure of the delivered gas. 5.5 Manifolds designed for acetylene, fuel gases other than acet
34、ylene, and those designed for nonammable medical gases, shall be provided with a back-ow check valve between each cylinder and the header, coupler block, or coupler tee. This check valve shall be located in the cylinder lead connecting tting on the header or coupler block, or in the manifold end of
35、the lead. Where portable manifolds are provided with coupler tees, the check valve shall be located in that portion of the tee connected to the shutoff valve of the cylinder. 5.6 The purpose of these check valves is to prevent the loss of gas from a bank of connected cylinders if for any reason the
36、pressure-relief device of an individual cylinder should function or a lead is severed. 5.7 Headers of stationary manifolds may be provided with a manual shutoff valve at each point where a single or a pair of cylinders can be connected. 5.8 Each section of multiple-header type stationary manifolds s
37、hall be provided with section shutoff valves to segregate from each other those sections designed to be operated alternately. 5.9 Headers of stationary manifolds shall be mounted on a supporting member, or the necessary mounting plates or brackets for making an installation shall be furnished with e
38、ach manifold. 5.10 Leads for making connections between cylinders and the manifold shall withstand the specied design rupture strength of the manifold with which they are to be used and shall also withstand manipulation under normal service conditions without kinking, splitting, or cracking. 5.11 Ca
39、ps or blind plugs provided to close unused cylinder-connecting openings in the manifold and intended for occasional use shall be attached by lengths of chain. JUNE 18, 2004 MANIFOLDS FOR COMPRESSED GASES - UL 407 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOU
40、T PERMISSION FROM UL 5.12 All manifolds and parts exposed to gas shall be free from grease, oil, dirt, or other foreign substances. 6 Manifolds for Acetylene 6.1 General 6.1.1 Manifolds for acetylene shall conform to the requirements of Construction General, Section 5, and to the following additiona
41、l requirements. 6.1.2 Manifolds, cylinder leads, and other parts handling acetylene at cylinder pressure shall withstand, without rupture, a hydrostatically applied test pressure of 10,000 pounds per square inch (psi) (69 MPa). 6.1.3 Copper or copper-bearing alloys exceeding 65 percent copper shall
42、not be used in the construction of acetylene-handling parts. 6.1.3 revised June 18, 2004 6.1.4 Piping or tubing used in the construction of stationary manifold headers shall have an internal diameter not greater than that of a nominal 1-1/4-inch double extra strong steel pipe. 6.1.5 Passages in mani
43、folds handling high-pressure acetylene shall be maintained as small as practicable, and all unnecessary voids or spaces shall be eliminated. 6.2 Back-pressure seal assembly 6.2.1 Each stationary acetylene manifold shall be provided with one or more back-pressure seal assemblies for installation in t
44、he piping system on the discharge side of pressure-reducing regulators. These seal assemblies may be of either the hydraulic or the dry-seal type. 6.2.2 Hydraulic back-pressure seal assemblies shall withstand, without rupture, a hydrostatically applied test pressure of 500 psi (3.4 MPa). Sheet steel
45、 used in the construction shall have a thickness of not less than 0.053 inch (1.35 mm) (No. 16 MSG). 6.2.3 Each hydraulic back-pressure seal assembly shall incorporate a mechanical back-ow check valve to prevent water from the hydraulic chamber being forced into the manifold piping under a back-pres
46、sure condition. 6.2.4 Each hydraulic chamber shall be provided with a water-ll opening and a drain opening. Such openings shall be closed by threaded caps or plugs. 6.2.5 The effective depth of the water seal in the hydraulic chamber, and the volume of water in the chamber, shall provide an effectiv
47、e seal. 6.2.6 A back-pressure seal assembly shall be designed to provide ash-back protection. 6.2.7 A mechanical relief valve set to start to discharge at a pressure of not more than 20 psi (137.9 kPa), shall be provided on each back-pressure seal assembly. This relief shall be designed for manual o
48、pening and for connection of vent piping at the installation. JUNE 18, 2004 MANIFOLDS FOR COMPRESSED GASES - UL 407 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6.3 Flash arrester 6.3.1 A ash arrester designed for use with high-pressure
49、acetylene shall be installed between each cylinder and the manifold. 7 Manifolds for Oxygen 7.1 Manifolds for oxygen, for other than medical use, shall conform to the requirements of Construction General, Section 5, and to the following additional requirements. 7.2 Manifolds, cylinder leads, and other parts handling oxygen at cylinder pressure shall withstand, without rupture, a hydrostatically applied test pressure of 10,000 psi (69 MPa). 7.3 Metal parts in contact with oxygen shall be stainless
