1、9 MILITARY STANDARD d MAGNETIC SILENCING REQUIREMENTS FOR THE CONSTRUCTION OF NOhTMAGNETIC SHIPS AND CRAFT (METRIC) PSC 1905 / THIS DOCUMENT CONTAINS 56 PAGES. y. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2143 17 W 7777711 0032834 5 W M
2、)D-STD-B143(SH) 1 June 1983 DEPARTMENT OF THE NAVY NAVAL SEA SYSTEMS COMMAND Washington, DC 20362 r Magnetic Silencing Requirements for the Construction of Nonmagnetic Ships and Craft (Metric). M DOD-STD-2143(SH) 24 This Military Standard is approved for use by the Naval Sea Systems Command, Departm
3、ent of the Navy, and is available for use by all Departments and Agencies E the Department of DeEense. 2. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SE
4、A 5523, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document E by letter. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.- S r: D
5、OD-STD-2143(SH) 1 June 1983 FOREWRD 1. This standard establishes uniform criteria for materials and equipment which, when implemented, will reduce the magnitude of the magnetic field of, nohagnetic mine warfare ships and craft. It also provides for the tagging of material and equipment complying wit
6、h the requirements of this standard and standardized documentation of magnetic information which will facilitate the . evaluation of the effects on the magnetic field of nonmagnetic mine warfare ships and craft from materials and equipment installed on or in the ship .or I craft. r . iii Provided by
7、 IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2143 17 m 7779911 003283b 7 m DOD-STD-2143(SH) 1 June 1983 CONTENTS Page 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 6 6 iv Provided by IHSNot for ResaleNo reproduct
8、ion or networking permitted without license from IHS-,-,-Paragraph 5.3.8 5.3.9 5.3.10 5.3.11 5.4 5.4.1 5.4.2 5.4.3 5.4.4 5.4.5 5.4.6 5.5 5.6 5.7 5.8 5.8.1 5.8.1.1 5.8.2 DOD-STD-2143(SH) 1 June 1983 CONTENTS - Continued Page FIGURES 7 7 7 7 7 7 8 8 8 8 8 9 Figure 1. 2. 3. 4. 5. 6. 7. 8. 9. Permissibl
9、e areas of electrically continuous loops constituting piping systems for ships (metric) - Permissible areas of electrically continuous loops other than loops constituting piping systems for ships (metric) Permissible areas of plates of electrical conducting Permissible sizes of enclosures constructe
10、d of material for ships (metric) . electrically continuous conducting material for ships (metric) Permissible areas of electrically continuous loops constituting piping systems for craft (metric) - Permissible areas of electrically continuous loops other than loops constituting piping systems for cr
11、aft (metric) Permissible areas of plates of electrical conducting Permissible sizes of enclosures constructed of material for craft (metric) . electrically continuous conducting material for craft (metric) Parameters for loops constituting piping systems - lo 14 18 22 26 30 34 38 42 V Provided by IH
12、SNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Figure 10. Table 1, Appendix A B DoD-STD-P143(SH) 1 June 1983 FIGURES - Continued Page TABLES Sample data for equipment layout of figure 14 -o 48 APPENDICES vi Provided by IHSNot for ResaleNo reproduction or networki
13、ng permitted without license from IHS-,-,-r, DOD-STD-2143 L7 m 77799LL 0032837 4 W DOD-STD-2143(SH) 1 June 1983 lm SCOPE 1.1 Scope. This standard covers the requirements that are imposed on materials and equipment which are to be installed on and that are pertinent to the magnetic silencing characte
14、ristics of nonmagnetic mine warfare ships and craft, 1.1.1 Application. Adherence to this standard is required in the design - of items, equipment, parts of equipment and systems which are to be installed h on nonmagnetic mine warf are ships and craft. Adherence to this standard is t. mine warfare s
15、hips and craft. This standard is not mandatory in the design of also required in the development of installation practices for nonmagnetic items, equipment, parts of equipment and systems.or in. the development of installation practices for ships and craft with magnetic steel hulls. 1.2 Classificati
16、on. Classification is applicable to the magnetic field sources upon which the requirements of this standard are imposed and types of magnetic information drawings. 1.2.i Magnetic field sources. Magnetic field sources are classified as follows : Class 1. Ferrous field source. Class 2. Eddy current fi
17、eld source. Class 3. Stray field source. o 2. REFERENCED DOCUMENTS 2.1 Issues of documents. The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS MILITARY MIL-P-15024 -
18、Plates, Tags, and Bands for Identification MIL-P-15024/5 - Plates, Identification. of Equipment. STANDARDS MILITARY MIL-STD-1310 - Shipboard Bonding, Grounding, and Other Techniques for Electromagnetic Compatibility and Safety . Section 070, D.C. Magnetic Field Environment (Metric). Part 1 DOD-STD-1
19、399, - Interface Standard for Shipboard Systems, 0 I-. . 1 -“ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2143(SH) 1 June 1983 DOD-STD-2133 - Cable Arrangement for Minimum Stray Magnetic DOD-STD-2134 - Storage Battery Arrangement for Mini
20、mum DOD-STD-2141 - Definitions and Systems of Units, Magnetic DOD-STD-2142 - Magnetic Silencing Characteristics, Measurement DOD-STD-2144 - Induction Clutches, Low Magnetic Field Design of DOD-STD-2145 - Disconnect Switch Boxes, Contactor Panels and Field (Metric). Stray Magnetic Field (Metric). Sil
21、encing (Metric). of (Metric). (Metric) . Switchboards, Low Magnetic Field Design of (Metric). Magnetic Field, Design of (Metric). DOD-STD-2146 - Direct Current Generators and Motors, Low Stray HANDBOOK MILITARY DOD-HDBK-270 - Metallic Materials, Magnetic Permeability and Electrical Conductivity, Cha
22、racteristics of (Metric) . (Copies of apecfications, standards, drawings, and publications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 3 DEFINITIONS 3.1 General magnetic silenci
23、ng terms. The meanings of general magnetic silencing terms used in this standard are in accordance with DOD-STD-2141. 3.1.1 B. See flux density (3.1.5). 3.1.2 Center. As used in this standard, center refers to the geometric center of the item (that is, center of a battery arrangement). 3.1.3 Enclosu
24、re. Enclosure refers to any structure that envelops a space or quantity within itself, such as boxes, lockers, switchboards, electrical cabinets, storage containers, and tanks. 3.1.4 Face area. Face area refers to the side of an enclosure which has the greatest surface area, whether it is the side,
25、top, or bottom of the enclosure. 3.1.5 Flux densitp Flux density is the magnetic flux per unit area denoted as B. This quantity is often specified or referred to in lieu of magnetic field intensity, H (valid in air or vacuum environment only). 3.1.6 Grounding wire. Grounding wire is a ground connect
26、ion of equipment and items at the level of the branch ground in the ships or crafts grounding eystem (see MIL-STD-1310). 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2143(SH) 1 June 1983 “ I 3.1.7 Loop. A loop is any structure that forms
27、 an electrically continuous path, such as piping loops, subbases, foundations, and non-symmetrical structures. 3,1.8 Magnetic documentation Magnetic documentation refers to magnetic information drawings and aperture cards of magnetic information drawings (see 5.8). 3.1.9 Pipingsystem. As used in thi
28、s standard, piping system is.a struc- ture which, as a system, transfers a fluid from one point to another point. 3.1.10 Plate. A plate is a flat, continuous surface of material. 4. GENERAL REQUIREMENTS 4.1 Material. In general, material to be installed on nonmagnetic mine warfare ships and craft sh
29、all be nonmagnetic and shall not exceed the appli- cable size limitations of 5.3. Magnetic materials may be used when required by an electrical function (see 5.2.1.1) or when required for mechanical strength (see 5.2.1.2). 4.1.1 Selection of material. DOD-HDBK-270 may be used as a guide in the selec
30、tion of material to be installed on nonmagnetic mine warfare ships and craft. Regardless of how the material selection is made, the material shall conform to the requirements of this standard. 4.2 Direct current (d.c.) electrical circuits. D.C. electrical circuit(s) which will be operated on any non
31、magnetic mine warfare ship or craft shall be designed in accordance with the requirements of 5.4, to minimize the stray mag- netic field produced by the circuit(s). 4.3 Provision of identification plates. Material and equipment that have met the requirements of this standard shall be provided with a
32、 separate identi- fication plate, which shall be permanently attached to the material and equip- ment. The identification plate inscription shall be as follows, with the appro- priate test method identification inserted: (a) FOR MATERIAL: This material conforms to DOD-STD-2143 and has passed test me
33、thod as specified in . (b) FOR EQUIPMENT: This equipment conforms to DOD-STD-2143 and has passed test method as specified in . This information shall not be combined on the general equipment identification plate. .4.3.1 Materials and physical characteristics of identification plates. Identification
34、plates shall be in accordance with MIL-P-15024, type A, B, C-, D, E, or F, and MIL-P-15024/5 except that class 302 corrosion-resisting steel material shall not be used. 4.4 Magnetic documentation. Magnetic documentation shall be provided in accordance with 5.8 for all class 1 and 2 field sources tha
35、t are to be installed on nonmagnetic mine warfare ships and craft. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DOD-STD-2343 37 W 7777933 0032842 4 m DOD-STD-2143(SH) 1 June 1983 5t DETAILED WQU1RE“ETS 5.1 Minimization of magnetic field. It is e
36、ssential that every effort be made to minimize the magnetic field of a nonmagnetic mine warfare ship or craft. The magnetic field contribution-of individual components of a ship or craft to the total magnetic field of the ship or craft is dependent signifi- cantly upon the following: (a) The magneti
37、c characteristics of the components material - whether it is magnetic or nonmagnetic is a function of its magnetic permeability and its fabrication (see 5.2). (b) The electrical conductivity of the components material and the construction of the component (see 5.3). (c) The d.c. circuits of the comp
38、onent (see 5.4). (d) The orientation and location of the component on the ship or (e) The degaussing system installed on the ship or craft (see 5.6)., craft (see 5.5). 5.2 Magnetic characteristics (class, 1). 5.2.1 Magnetic and nonmagnetic material requirements. In general, material Co be installed
39、as part of or on a nonmagnetic mine warfare ship or craft shall be nonmagnetic. Materials which serve an electrical function or require mech- anical strength may be magnetic in accordance with 5.2*1.1 and 5.2.1.2, respec- tively t 5t2.1.1 Material serving an electrical function. Material, of which e
40、lectrical function in equipment requires the material to be magnetic for normal operation, may be magnetic. However, equipment shall be designed to minimize the volume of magnetic material required. Upon the request of the contracting activity, the contractor shall prove to the satisfaction of the c
41、ontracting activity that a nonmetallic or a nonmagnetic material cannot be used. 5.2012 Material, requiring mechanical strength. The material of an equipment or equipment part which must exhibit a mechanical strength that caw not be attained with nonmagnetic material may be magnetic. However, the eq
42、uip- ment or equipment part shall be designed to minimize the volume of magnetic material required. Upon the request of the contracting activity, parta subject to usage under high stress, where the maximum dimension of the equipment or equipment part: exceeds 5 centimeters (cm) and where the sum of
43、the maximum dimension of all parts having a similar function in a 9 meter section of the ship exceeds 1.5 meters, shall be reported to the contracting activity. The contractor, upon the request of the contracting activity, shall prove to the Satisfaction of the Contracting activity that a nonmetalli
44、c or a nonmagnetic material cannot be used. 5.2.1.3 Location of mandatory magnetic material. Components containing magnetic material shall be located as high in the ship or craft as practicable and shall be widely dispersed through the ship or craft as is practicable, to avoid producing peaks in the
45、 curve of the ships or crafts magnetic signature. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-L DOD-STD-2143 17 M 77777L1 0032843 b M DOD-STD-2143(SH) 1 June .1983 5.2.2 Permeability of material. DOD-HDBK-270 may be used as guidance relating to t
46、he effects of fabrication methods on the magnetic permeability of materials. However, regardless of materials selected because of conclusions drawn from DOD-HDBK-270, the relative magnetic permeability after fabrication of all materials shall not exceed 2.0, subject to the exceptions of 5.2.1.1.- or
47、 5.2.1.2. 5.2.3 Welding. Welds shall have a relative magnetic permeability of 2.0 or less in their finished condition. . B 5.2.4 Magnetic components. Unless otherwise approved by the contracting activity prior to installation, items, equipment, or systems which contain ferrous magnetic field greater
48、 than 0.15 ampere per meter (A/m) (B - 188 nT) at any point 2 meters from the center of the item, equipment or system. r S magnetic components in accordance with 5.2.1.1 or 5.2.1.2 shall.irot emanate a 5.3 Electrical conductivity of material (class 2). Any material to be installed as part of or on a
49、 nonmagnetic mine warfare ship or craft shall con- form to the requirements of 5.3.1 and 5.3.2, and to the size limitations specified in 5.3.3 through 5.3.11. 5.3b1 Electrical conductors. Except for ground conductors and cable .- armor,. electrical conductors specifically designed to carry an electric current (alternating or direct) s
