1、MIL- PRF- 2 8 63 C (SH) 4 February 2000 SUPERSEDING MIL- P- 2 8 63B (SHIPS) 24 April 1963 PERFORMANCE SPECIFICATION PACKING, PREFORMED, CONDENSER TUBE, NON-ASBESTOS 1. SCOPE 1.1 Scope. This specification establishes the requirements for preformed packing assemblies for sealing to tube-to-tubesheet j
2、oints in main and air- ejector type steam condensers. 1.2 Classification. Packing grades are as follows, and as specified (see 6.2) : Grade A - Seawater-cooled main-condenser type applications. Grade B - Freshwater-cooled air-ejector-condenser type applications. 2. APPLICABLE DOCUMENTS 2.1 General.
3、The documents listed in this section are specified in sections and 4 of this specification. This section does not include documents cited n other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of th
4、is list, document users are cautioned they must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Other Government documents, drawinss, and publications. The following other Government documents,
5、 drawings, and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues are cited in the solicitation (see 6.2). CODE OF FEDERAL REGULATIONS (CFR) 40 CFR 261 -Protection of Environment: Identification and Listing of Hazardous Waste Beneficial c
6、omments (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, SEA 05Q, 2531 Jefferson Davis Highway, Arlington VA 22242-5160 by using the Standardization Document Improvement Proposa
7、l (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 5330 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Licensed by Information Handling ServicesMIL - PRF - 2 8 63C (SHI 2.3 Non-Government publications. The following documents form a p
8、art of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DoDISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DoDISS are the issues of the
9、 documents cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 512 - Test Methods for Chloride Ion in Water. (DoD adopted) D 516 - Test Methods for Sulfate Ion in Water. D 1179 - Test Methods for Fluoride Ion in Water. (DoD adopted) D 1246 - Test Method for Iodid
10、e and Bromide in Water. (DoD adopted) D 4327 - Test Method for Anions in Water by Ion Chromatography. (Application for copies should be addressed to the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428- 2959. ) 2.4 Order of precedence. In the event of a
11、conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Oualification. Packing material furnished un
12、der this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3). 3.2 Composition. The packing material and construction shall conform to that of the sample submitted for qualificatio
13、n inspection. Asbestos and polychlorinated biphenyls (PCBs) shall not be used in the packing material. The manufacturer shall certify that no asbestos or PCBs were intentionally included in packing elements, components or coatings. 3.2.1 Recycled, recovered, or environmentally preferable materials.
14、Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the materials meet or exceed the operational and maintenance requirements, and promote economically advantageous life cycle costs. 3.3 Sizes 3.3.1 Grade A packinq. 3.3.1.1 Metalli
15、c rinqs. Sizes shall conform to those shown in table I, as specified (see 6.2). TABLE I. Sizes for qrade A metallic rinqs Inside diameter Outside diameter Length in) in) in) 0.625 0.781 O .312 0.750 0.906 O .312 0.875 1.031 O .312 I 1.000 1.156 O .312 2 Licensed by Information Handling ServicesMIL -
16、 PRF - 2 8 63C (SHI Inside diameter in) 0.625 0.750 0.875 1.000 I Outside diameter Length in) in) 0.781 0.187 0.906 0.187 1.031 0.187 1.156 0.187 I TABLE III. Sizes for srade B metallic rinss. Inside diameter in) 0.625 Outside diameter Length in) in) 0.781 0.187 0.625 0.625 0.625 0.625 0.750 0.750 0
17、.781 0.781 0.781 0.781 0.906 0.906 O .375 O .250 O .375 O .406 O .437 O .250 Inside diameter in) 0.625 0.625 0.750 Outside diameter Length in) in) 0.781 0.187 0.781 O .250 0.906 0.187 3.3.2.2 Non-metallic rinss. Sizes shall conform to those shown in table IV, as specified (see 6.2). The rings shall
18、be sufficiently resilient to insure flowing into the threads of the stuffing box by light caulking without deformation to the tube ends. TABLE IV. Sizes for srade B non-metallic rinss. 3.3.3 Tolerances. A tolerance of minus O, plus 0.007 inch will be permitted on the inside diameter. A tolerance of
19、plus or minus 0.03 inch will be permitted for outside diameter and length. The inside diameter, outside diameter and length shall be measured to the nearest 0.01 inch. 3.4 Weisht. The weight per 1000 rings shall be within 20% of the weight of the sample submitted for qualification. Individual rings
20、weighed during inspection shall be weighed to the nearest 0.0002 pounds (0.lg). 3.5 Resilience of metal rinss. 3.5.1 Grade A. The resiliency shall be such that the change in height (compression) of a stack of six rings shall not be less than 0.10 inch or more than 0.20 inch (see 4.4.1). 3.5.2 Grade
21、B. The resiliency shall be such that the change in height (compression) of a stack of six rings shall not be less than 0.02 inch or more than 0.05 inch (see 4.4.1). 3 Licensed by Information Handling ServicesMIL - PRF - 2 8 63C (SHI 3.6 Detrimental materials for srade B packinq. 3.6.1 Halosen concen
22、tration. The sum of high-temperature water-leachable halogens shall not exceed 250 ppm, or the total halogen concentration, excluding fluoride, shall not exceed 250 ppm, and the packing manufacturer shall certify in writing that the only intentionally added halide-bearing ingredient is polytetrafluo
23、roethylene. (see 4.4.2). 3.6.2 Sulfur concentration. Total sulfur concentration shall not exceed 700 ppm or water-leachable sulfur shall not exceed 250 ppm (see 4.4.2). 3.6.3 Cadmium concentration. Total cadmium concentration shall not exceed 250 ppm (see 4.4.2). 3.6.4 Lead concentration. Total lead
24、 concentration shall not exceed 250 ppm (see 4.4.2). 3.6.5 Mercury. During manufacturing, fabrication, handling and packaging, the packing shall not come into contact with mercury or mercury compounds. The manufacturer shall certify that mercury or mercury compounds did not come into contact with th
25、e packing or packing elements, components or coatings during manufacture. 3.7 Simulated performance. There shall be no leakage through the packing when tested in accordance with 4.4.3. The packing rings shall be sufficiently compressible or malleable so that they may be freely caulked into the tube
26、sheet drilling and seal the pressure without impeding the movement of the tube or cause deformation of the tube. 3.8 Workmanship. The workmanship shall meet all requirements of this specification. The rings shall be free from voids, cracks, seams, blisters, tears, burrs and foreign matter that may a
27、ffect the use of the finished product. The ends of metallic rings shall be finished smooth (see 4.4.4). 3.9 Toxicity. The condenser packing shall have no adverse effect on the health of personnel when used for its intended purpose (see 6.6). 3.10 Disposal. The manufacturer shall certify that condens
28、er packing shall not contain any hazardous material or exhibit any hazardous characteristic as defined under 40 CFR 261 (Code of Federal Regulations). The manufacturer shall make every effort to adhere to this requirement. If no product which meets this requirement can be identified, (i.e., if conde
29、nser packing does contain a hazardous material), the manufacturer shall provide information detailing proper disposal of the packing. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a) Qualification inspection (see 4.2) b) Co
30、nformance inspection (see 4.3) . 4 Licensed by Information Handling ServicesMIL - PRF - 2 8 63C (SHI Inspection Sizes Weight Resilience Detrimental materials Simulated performance Visual examination Requirement Test methods 3.3 4.4.5 3.4 4.4.5 3.5 4.4.1 3.6 4.4.2 3.7 4.4.3 3.8 4.4.4 Inspection Sizes
31、 Weight Resilience Visual Examination 4.3.1.2 Samplins for tests. At a minimum, the contractor shall randomly select a sample quantity from each lot of completed packing in accordance with table VII, and test them in accordance with paragraphs 4.4.1 through 4.4.5. If one or more defects are found in
32、 any sample, the entire lot shall be rejected. The contractor has the option of screening 100% of the lot for the defective characteristic(s) or providing a new lot that shall be inspected in accordance with the sampling plan contained herein. Requirement Test Methods 3.3 4.4.5 3.4 4.4.5 3.5 4.4.1 3
33、.8 4.4.4 Lot size 2 to 25 25 to 50 91 to 150 151 to 280 281 to 500 501 to 1,201 1,201 to 3,200 3,201 to 10,000 10,001 to 35,000 29 4.3.1.3 Rejection. Samples tested as specified in 4.2 and 4.3, which fail to meet the requirements specified herein, shall be cause for rejection. If the failure occurre
34、d during qualification testing additional samples shall be taken from each subsequent lot and shall withstand the test wherein the failure occurred. The additional testing shall be discontinued after four successive lots have passed the test or tests. Sample size 3 5 5 Licensed by Information Handli
35、ng ServicesMIL - PRF - 2 8 63C (SHI 4.4 Tests 4.4.1 Resilience of metal rinqs. Six packing rings shall be placed on a close-fitting metal rod mounted on a supporting base. The height of the stack of six rings (designated H1) shall be measured. A weight of 70 pounds shall be placed on the top of the
36、stack for a period of five minutes and the height (designated H2) again measured. H2 is measured prior to removal of the 70-lb weight and shall be measured within 30 seconds of the end of the five-minute period. Record the following measurements and calculation: 1) H1 2) H2 3) H1 - H2 = absolute com
37、pression 4.4.2 Detrimental materials for qrade B packinq rinqs. 4.4.2.1 Halosen content 500F leach test. a) Two packing material test specimens shall be taken. Each test specimen shall weigh not less than 15 grams and shall be taken from a different sample. The test specimen of packing material shal
38、l be representative of the sample cross section. b) The test specimens shall be cut into pieces not larger than 1/8 by 1/4 inch. c) Each test specimen shall be weighed, transferred to a pressure vessel (that is, Parr bomb or equivalent) covered with 200 to 300 mL of distilled or demineralized water
39、and maintained at approximately 500F (260C) for a minimum of 6 hours. The leach water shall then be separated by filtration and the filter rinsed. A blank determination shall be run using similarly cleaned equipment and distilled or demineralized water from the same source. d) The constitution of br
40、omide, chloride and fluoride ions in each filtrate shall be determined by the blank determination and ASTM D 1246, ASTM D 512 and ASTM D 1179 respectively or ASTM D 4327. NAVSEA approval to use equivalent analysis methods is not required but should be highlighted in the test information. e) The resu
41、lts of each test shall be calculated as net ppm of extractable halide ion by weight of the test specimen. 4.4.2.2 Sulfur concentration. Any standard test method, such as ASTM D 516 or ASTM D 4327, may be used to determine total sulfur concentration. The following 500F-leach test shall be used to det
42、ermine water-leachable sulfur concentration: a) Cut two specimens from the selected sample, weighing approximately 20 grams, record their weight to 0.1 gram and identify them as specimens A and B. This identification shall be maintained through the test. b) Each test specimen shall be transferred to
43、 a suitable pressure vessel (Parr reaction vessel, or equivalent), covered with enough distilled water to obtain a final volume of 500 ml and heated at 500 I 10F for a minimum of 6 hours. The leach water shall then be separated by filtration and the filter rinsed. A control filtrate shall be run usi
44、ng similarly cleaned equipment and distilled water from the same source. c) Using aliquots from the control filtrate and filtrates A and B, the concentration of sulfur ions in each filtrate shall be determined by an appropriate method of ASTM D 516 or by an equivalent method. The 6 Licensed by Infor
45、mation Handling ServicesMIL - PRF - 2 8 63C (SHI concentration of water-leachable sulfur in the material shall be determined as follows: Sulfur pg/g (ppm) = C multiplied by 500/M where : C = sulfur concentration of filtrate, in milligrams per liter; and M = grams of test specimen, prepared per a) ab
46、ove. 4.4.2.3 Cadmium and lead concentration. Any standard test method may be used to determine total cadmium and lead concentration (suggested: use oxygen combustion bomb digestions for metal analysis; analyze digestates of cadmium and lead by direct aspiration atomic absorption spectroscopy). 4.4.3
47、 Simulated performance. 4.4.3.1 Test fixture. Simulated performance tests shall be conducted in an apparatus consisting of two 1.25-inch thick brass tube sheets bolted to the flanged ends of an 11-inch length of 8-inch pipe. Each tube sheet shall contain six stuffing boxes drilled 0.75 inch deep and
48、 tapped for 0.625-inch condenser tubes. Ferrules are to be 0.625 inch long with 18 threads per inch. Copper nickel alloy tubes of 0.049-inch wall thickness shall be used in the test. Thermocouples shall be located in the center of each tube sheet and inside the pipe. In the event that sustained leak
49、age occurs, provisions shall be made to collect leakage water from the joints for volumetric measurements. 4.4.3.1.1 Test samples. Only packing assemblies that have been tested per paragraphs 3.3, 3.4 and 3.5 of this procedure shall be used for simulated performance tests. Each packing assembly and its location in the test fixture shall be recorded. This will allow identification of a particular packing assemblys physical characteristics in the event that there is leakage. 4.4.3.1.2 Grade A. The six tubes shall be packed with four rings at each end. The four-ri
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