1、MIL-T-24270B 66 9999906 0132690 3 m MIL-T-24270B(SH) 2 September 1983 SUPERSEDING MIL-W-24270A(SHIPS) 13 May 1971 (See 6.8) MILITARY SPECIFICATION THERMOWELLS FOR THERMOMETERS AND ELECTRIC Rod, Flat Products with Finished Edges (Flat Wire, Strip, and Bar), Shapes and Forgings. Nickel-Copper-Alloy (M
2、onel and R-Monel) Rods, Plates, Bars, Sheets, Strips, Wire, Forgings, and Structural and Special Shaped Sections. Steel Bars, Wire, Shapes and Forgings. Copper-Nickel Alloy Rods, and Flat Products (Flat Wire, Strip, Sheet, Bar and Plate) and Forgings Bimetallic (3 and 5 Inch Dial). Dial, Gas Actuate
3、d. Assemblies, General Specification For (Naval Shipboard). Indicators, Temperature, Direct Reading, Thermometers, Remote Reading, Self-Indicating Thermocouples and Resistance Temperature Element Screw Thread Standards or Federal Service. Unified Thread Form and Thread Series for Bolts, Screws, Nuts
4、, Tapped Holes and General Applica- tions. Marking for Shipment and Storage. Schedule of Piping, Valves Fittings and Associ- ated Piping Components for Naval Submarine Service. ated Piping Components for Naval Surface Ships. Standard Dimensions. Schedule of Piping, Valves Fittings and Associ- Boss,
5、Gasket Seal Straight Thread Tube Fitting, (See supplement 1 for applicable specification sheets.) 3 “ Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-T-24270B bb m 993990b 0132693 9 m 2.102 Other Government drawings and publications. The followi
6、ng other Government drawings and publications form a part of this specification to the extent specified herein. NAVAL SEA SYSTEMS COMMAND (NAVSEA) NAVSHIP 810-1385917 - Temperature Indicator and Thermowell Selection. PUBLICATIONS NAVSEA 0900-LP-00-038-8010 - Ship Metallic Material Compression and Us
7、e Guides. NAVSEA 0948-LP-045-7010 - Material Identification and Control (MIC) for Piping Systems Volume 1 o (Copies of specifications, standards, drawings and publications required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as
8、 directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. The issues of the documents which are indicated as DoD adopted shall be the issue listed in the current DoDISS and the supplement thereto, if appli
9、cable. AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) B46.1 - Surface Texture. (DoD adopted) Y14.5 - Dimensioning and Tolerancing. (DoD adopted) (Application for copies should be addressed to the American National Standards Institute, 1430 Broadway, New York, NY 10018.) ASTM A 105 - Hand Drawn Copper
10、Alloy Wires for Electric Conductors. B 150 - Rod, Bar and Shapes Aluminum Bronze, (DoD adopted) (Application for copies should be addressed to the ASTM, 1916 Race Street, Philadelphia, PA 19103 ) NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION, INC., AGENT National Motor Freight Classification (Applicati
11、on for copies should be addressed to the National Motor Freight Traffic Association, Inc., ATA TRAFFIC Dept., 1616 *P* Street, NW, Washington, DC 20036.) (Industry association specifications and standards are generally available for reference from libraries. They are also distributed among technical
12、 groups and ueing Federal agencies.) 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein, the text of this specifica- tion shall take precedence. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without lice
13、nse from IHS-,-,-flIL-T-24270B bb m 77777Ob 0132679 O MIL-T-24270B(SH) 3. REQUIREMENTS 3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the applicable specification sheet. In the event of any conflict between the requirements of this spec
14、ification and the specification sheet, the latter shall govern. 3.2 Materials. Thermowells shall be of the following wrought or forged materials. Metal material specified in accordance with NAVSEA 0900-LP-038-8010 may be substituted if physical and chemical characteristics are similar. Material Symb
15、ol Specification Copper-nickel (70-30)11 CUNI MIL-C-15726 Corrosion resisting steel21 CRES QQ-S-763 classes 316, 321, 347 Nickel-copper?/ NICI QQ-N-2 8 1 Aluminum bronze?/ method of attachment to pressure vessel, pipe, tank, fitting or bulkhead; type of joint (silver-brazed or socket-welded and full
16、-penetration- welded) between the thermowell and mounting are detailed on Drawing 810-1385917. Identification and control for material used in critical piping systems (level I) shall be in accordance with NAVSEA 0948-LP-045-7010, 6.4 Stress calculations. The method of determining maximum allowable s
17、tresses with regard to applicable system characteristics in order to select an acceptable material is shown on Drawing 810-1385917, Note 8. 6.5 Material selection. The material selection shall be compatible for either welding or silver brazing and the applicable rated pressure and temper- ature limi
18、ts of the system in which the thermowell will be used (see MIL-Sm-438 or MIL-STD-777). Material for designated use shall be selected according to the footnotes of 3.2 of this specification. 6.6 Insertion length selection. The combination of the insertion length of the thermowell and the stem length
19、of the thermal element will be selected to ensure that the sensitive portion of the temperature sensing element is completely immersed in the medium whose temperature is being measured. 6.7 Sub-contracted material and parts. The packaging requirements of referenced documents listed in section 2 do n
20、ot apply when material and parts are acquired by the contractor for incorporation into the equipment and lose their separate identity when the equipment is shipped. 6.8 Changes from previous issue. Asterisks are not used in this revision to identify changes with respect to the previous issue, due to the extensiveness of the changes. Preparing activity: Navy - SH (Project 6685-N681) 11 *U.S. GOVERNMENT PRINTING OFFICE: 1983-605-034/4199 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
