1、H-33-li MIL-T-20215C . 3 December 1985 SUPERSEDING MIL - B - 2 O 2 15 B (NAVY) 24 August 1964 (See 6.3) MILITARY SPECIFICATION TILE REFRACTORY, SILICON CARBIDE . This specification is approved for use by all Departments and Agencies of the Department of Defense. R 1. SCOPE $- 1.1 Scope. This specifi
2、cation covers silicon carbide refractory tile for use as baffles In naval boiler furnaces. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standards form a part of this specification to the extent specified herein. Unless otherwi
3、se specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation. SPECIFICATIONS FEDERAL PPP-B-601 - Boxes, Wood, Cleated Plywood. PPP-B-621 - Boxes, Wood, Nail
4、ed and Lock-Corner. PPP-B-636 - Boxes, Shipping, Fiberboard. STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-147 - Palletized Unit Loads. Attributes. Beneficial comments (recommendations, additions, deletions)
5、and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the en
6、d of this document or by letter. FSC 9350 IISTRIBUTION STATEMENT A Approved for public release; distribution unlimited F THIS DOCUMENT CONTAIHS 7 PAGES Licensed by Information Handling ServicesMIL-T-20215C 2.1.2 Other Government drawing. The following other Government drawing forms a part of this sp
7、ecification to the extent specified herein. wise specified, the issues shall be those in effect on the date of the solicita- t on. Unless other- DRAWING NAVAL SEA SYSTEMS COMMAND (NAVSEA) NAVSHIPS 810-1385936 - Tile, Baffle, Silicon Carbide for Marine Boilers. (Copies of specifications, standards, a
8、nd drawings required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless
9、 otherwise specified, the issues of the documents which are DoD adopted shall be those listed in the issue of Che DoDISS specified in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS shall be the issue of the nongovern- ment documents which is current on
10、 the date of the solicitation. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) C 20 - Test Methods for Apparent Porosity, Water Absorption, Apparent Specific Gravity, and Bulk Density of Burned Refractory Brick and Shapes by.Boiling Water. Carbon-Ceramic Refractories. C 571 - Standard Methods for
11、Chemical Analysis of Carbon and D 3951 - Practice for Commercial Packaging. (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103). (Nongovernment standards and other publications are normally available from the organi
12、zations which prepare or which distribute the documents. uments also may be available in or through libraries or other informational services.) These doc- 2.3 Order of precedence. In the event of a conflict between the text of this specification and the references cited herein (except for associated
13、 detail specifications, specification sheets or MS standards), the text of this specifi- cation shall take precedence. Nothing in this specification, however, shall supersede applicable laws and regulations unless a specific exemption has been obtained, 3. REQUIREMENTS 3.1 Material, The tile shall b
14、e composed of a bonded silicon carbide material formed to a uniform, dense structure. 3.2 Density, The bulk density shall be not less than 2.50 grams per cubic centimeter (see 4.4,l). Licensed by Information Handling ServicesMIL-T-202ISC 73 W 9797906 0337486 b W - L: MIL -T - 2 O2 15 C 3.3 Porosity.
15、 The apparent porosity shall be not more than 18 percent (see 4.4.1). 3.4 Chemical composition. The silicon carbide content shall be not less than 85 percent by weight of the finished product. The product shall contain not more than 0.5 percent of lime (Cao), not more than 0.25 percen-of alkalies, a
16、nd not more than 0.1 percent of magnesia (MgO) (see 4.4.2). 3.5 Dimensions. Tile shall be furnished in the size and shape specified (see 6.2), and shall conform to the dimensions and tolerances shown on Drawing 810-1385936. 3.6 Marking. Each tile shall be marked with the piece number and the manufac
17、turers brand name or symbol in accordance with Drawing 810-1385936. 3.7 Workmanship. The silicon carbide tile shall be of uniform structure, density and porosity throughout with no cracks, voids or soft centers. The tile shall have smooth dense surfaces. Edges and corners shall be sufficiently solid
18、 and strong to prevent crumbling and chipping during normal handling. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein.
19、 Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspect
20、ions set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to pre- scribed requirements. 4.1.1 Responsibility for compliance. All items must meet all requirements of sections 3 and 5. The inspection set forth in this specification shall be
21、come a part of the contractors overall inspection system or quality program. absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of assuring that all products or supplies sub- mitted to the Government for acceptance comply with all requi
22、rements of the con- tract. Sampling in quality conformance does not authorize submission of known. defective material, either indicated or actual, nor does it commit the Government to acceptance of defective material. The 4.2 Quality conformance inspection. Sampling for inspection shall be per- form
23、ed in accordance with MIL-STD-105, except where otherwise indicated. 4.3 Inspection of end item. 4.3.1 Examination of the end item. Examination of the end item shall be made in accordance with the classification of defects, inspection levels and acceptable quality levels (AQLs) (see table I). The in
24、spection levels for determining the sample size, and the AQLs expressed in defects per 100 units are given in table I. 3 Licensed by Information Handling ServicesExamine Wsrkmans hip Dimens ions Packaging Count Weight Markings MIL -T - 2 O 2 15 C TABLE I. classification of defects Defect Cracked, br
25、oken laminations Surfaces, not smooth or dense Corner or edges chipped or crumbled affecting service- abi 1 ity Any specified dimension not within the tolerances Specified on Drawing 810-1385936 Packaging material not as specified Flore than one size or shape per package No level specified Container
26、 not as specified, closures not accomplished by specified or required methods or materials Any nonconforming component, component missing, damaged or otherwise defective, affecting serviceability Inadequate application of component, such as incomplete closures of container flaps, loose or inadequate
27、 strap- pings, bulged or distorted containers Number of tiles per container less than indicated quantity Gross weight exceeds speci- fied requirements Omitted, illegible, incorrect, incomplete Classification Major X X X X X X X X X X Minor Inspection level s -4 s-4 s-4 s -4 s-1 s-1 s-1 s-1 s-1 s-1 s
28、-1 s-1 s-1 AQL 2.5 2.5 2.5 2.5 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4.0 4 Licensed by Information Handling Services- MIL-T-20215C 73 M 7979906 OL17VBB T W MIL -T - 2 O 2 15 C 4.3.2 Testing of the end item. Samples of the tile selected from each lot presented for examination shall be tested for bulk densi
29、ty, apparent specific gravity and chemical analysis. 4.3.2.1 Bulk density and apparent specific gravity. The inspection level for determining the sample size shall be S-3. expressed in defects per 100 units shall be 6.5. The acceptable quality level . 4.3.2.2 Chemical analysis. The sample size for c
30、hemical analysis shall be 5 tiles, selected at random. If the average chemical composition (see 4.4.2) does not conform to the requirements of 3.4, this shall be cause for rejection of the lot represented. 4.4 Test procedures. 4.4.1 Bulk density and apparent porosity. The bulk density and apparent p
31、orosity shall be determined in accordance with ASTN C 20. Samples shall be tested intact without cutting or breaking. 4.4.2 Chemical analysis. 4.4.2.1 Sample preparatin. A single piece, weighing approximately 4-6 grams and free of original surface or skin, shall be broken from each of the five sampl
32、e tiles. Each piece so selected shall be crushed by impact, pre- ferably with a pneumatic hammer in a tool steel mortar, and not by grinding, sufficiently to pass through a 100-mesh standard screen. Samples prepared in this manner from each sample unit shall be combined, thoroughly mixed and quarter
33、ed. From the composite sample, duplicate samples shall be taken for two parallel chemical analyses. 4.4.2.2 Chemical analysis procedure. Chemical analysis, to establish com- pliance with 3.4, shall be determined in accordance with ASTM C 571. The average of the two determinations for each constituen
34、t shall be reported. 5. PACKAGING (The packaging requirements specified herein apply only for direct Govern- ment acquisition) . 5.1 Preservation. Preservation shall be level A, Cor commercial, as specified (see 6.2). Packs shall contain tile of one size and shape only. 5.1.1 Level A. Tile shall be
35、packed in fiberboard boxes conforming to PPP-B-636 weather-resistant. Boxes shall be of variety DW (double wall) or variety SW (single wall). SW boxes shall be provided with a full height inside liner of the same grade as the box used. Tiles shall be individually wrapped with cushioning media or seg
36、regated through the use of fiberboard partitions. AdditionaI cushioning as required shall be used to fill all void spaces within the boxes. Loose fill material including straw or sawdust shall not be used. Boxes shall be closed and reinforced with non-metallic tape or banding with box- closure confo
37、rming to method V of the appendix to the box specification. weight of boxes shall not exceed 40 pounds. Gross 5 Licensed by Information Handling ServicesMIL-T-20215C 5,1.2 Level C. Tile shall be packed as specified in 5.1.1 except that boxes shall be of the domestic class, minimum grade 200 and box
38、closure shall conform to method I of the appendix to the box specification. 5.1.3 Commercial, Tile shall be packed in accordance with ASTN D 3951. 5.2 Packing. Packing shall be level A, B, C or commercial, as specified (see 6.2). Unless otherwise specified (see 6.2), shipping containers or pallets s
39、hall contain packs of tile of one size and shape only. 5.2.1 Level A, Tile, preserved as specified in 5.1 shall be packed in wood or wood cleated plywood boxes or unitized on pallets conforming to PPP-B-621, class 2, PPP-B-601 overseas type or MIL-STD-147, load type la, bonding means “O“ or “Pti res
40、pectively. with the box specification or appendix thereto. shall not exceed 200 pounds of palletized loads 3000 pounds. Box closure and reinforcement shall be in accordance Gross weight of wood boxes 5.2.2 Level B. Tile, preserved as specified in 5.1 shall be packed as specified-in 5.2.1 except that
41、 wood and wood cleated plywood boxes may be of the domestic type or class. 5,2.3 Level C. Tile, preserved as specified in 5.1 may be shipped without overpacking. When specified (see 6.2) preserved tiles shall be in unit loads on pallets conforming to MIL-STD-147 with load type and bonding means at t
42、he option of the contractor. 5.2.4 Commercial. Tile, preserved as specified in 5.1 shall be packed in accordance with ASTM D 3951. 5.3 Marking. In addition to any special marking required, (see 6.2) level A, il and C interior and exterior boxes and palletized unit loads shall be marked in accordance
43、 with MIL-STD-129 include bar code markings. Commercial interior and exterior boxes and palletized unit loads shall be marked in accor- dance with ASTMD 3951 and shall include bar code marking of MIL-STD-129. 6. NOTES 6.1 Intended use. The silicon carbide refractory tile is intended for use as baffl
44、es in naval boiler furnaces. 6.2 Ordering data, Acquisition documents should specify the following: (a) Title, number, and date of this specification. (b) Size and shape of tile required (see 3.5). (c) Level of preservation and packing required (see 5.1 and 5.2). (d) When shipping containers or pall
45、ets may contain other than tile (e) Special marking required (see 5.3). of one size and shape only (see 5.2). 6 i Licensed by Information Handling ServicesMIL-T-20235C 73 777770b 0337g70 PI 1 L -T - 2 O 2 15 C 6.3 Changes from previous issue. Asterisks are not used in this revision to identify changes with respect to the previous issue due to the extensiveness Custodians: Navy - SH Army - P Review activity: DLA - GS User activities: Navy - CG Army - MR Preparing activity: Navy - SH (Project 9350-0097) 7 Licensed by Information Handling Services
