1、MIL-C-24746 (1) 9999906 2024194 438 1 INCH-POUND - MIL-C-24746(SH) AMENDMENT 1 8 November 1996 MILITARY SPECIFICATION COOLERS, UNIT FORCED AIR FOR SHIPS REFRIGERATED STORES This amendment forms a part of MIL-L-24746, dated 31 December 1990, and is approved for use by the Naval Sea Systems,Command, D
2、epartment of the Navy, and is available for use by all Departments and Agencies of the Department of Defense. PAGE 2 2.1: SPECIFICATIONS, FEDERAL: Delete the following: “PPP-F-320 - Fiberboard: Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes“. 2.1: SPECIFICATIONS, MILITARY: Chang
3、e the title of MIL-R-16743 to “Refrigerating Plants and Systems, Mechanical; and Refrigerating System Components - Dichlorodifluoromethane (R-12) and Tetrafluoroethane (R-134a) - Naval Shipboard“ . 2.1: SPECIFICATIONS, MILITARY: Delete the following: “MIL-L-19140 - Lumber and Plywood, Fire-Retardant
4、 Treated. MIL-C-81302 - Cleaning Compound, Solvent, Trichlorotrifluoroethane“. 2.1: SPECIFICATIONS, MILITARY: Add “MIL-C-29602 - Cleaning Compounds, for Parts Washers and Spray Cabinets“. PAGE 3 2.1: STANDARDS, MILITARY: Delete the following: “MIL-STD-1186 - Cushioning, Anchoring, Bracing, Blocking
5、and MIL-STD-2073-1 - DoD Materiel Procedures for Development and Waterproofing; with Appropriate Test Methods. Application of Packaging Requirements.“ FSC 4110 AMSC N/A DISTRIBUTION STATEMENT A. Approved for public release distribution is unlimited. 1 of 3 Provided by IHSNot for ResaleNo reproductio
6、n or networking permitted without license from IHS-,-,-MIL-C-24746 (1) 977990b 2024195 374 MIL-C-24746(SH) AMENDMENT 1 2.2: Non-Government publications, Add the following: “AIR-CONDITIONING AND REFRIGERATION INSTITUTE AR1 700 - Specifications For Fluorocarbon And Other Refrigerants. (Application for
7、 copies should be addressed to Air-conditioning and Refrigeration Institute, 4301 North Fairfax Drive, Arlington, VA 22203.) PAGE 4 2.2: Non-Government publications, AMERICAN SOCIETY FOR TESTING MATERIALS (ACTM): Delete ASTM D 3951 - Standard Practice for Commercial Packaging. (DoD adopted). “ PAGE
8、6 Table I: Under “Materials“ column for “Refrigerant“ delete Type R-12 or R-22“ and replace with “R-12 or R-22 for existing systems and R-134a for new or converted systems“. Under “Specification“ column for “Refrigerant“ after BB-F-1421, add “, AR1 700“. PAGE 7 3.4.2: Delete and substitute: “3.4.2 u
9、 auid refr iaerant t emDerature. For R-12 and R-22 coil and expansion valve sizing, the liquid refrigerant temperature at the inlet of the expansion valve shall be taken as 103F with a corresponding pressure of 123 lb/in gauge. For R-134a coil and expansion valve sizing, the liquid refrigerant tempe
10、rature at the inlet of the expansion valve shall be taken as 103F with a corresponding pressure of 130 lb/in gauge. The unit shall be sized for a saturated evaporating temperature of minus 20F and plus 25F.“ PAGE 8 3.10: First sentence, delete and substitute: “The cooling coil shall be a direct expa
11、nsion, extended surface type for use with the refrigerant specified (see 6.2).“ PAGE 22 4.7: Delete in its entirety. PAGES 22 - 24 Section 5: Delete the entire Section 5 and substitute: “5. PACKAGING 5.1 packaainq. For acquisition purposes, the packaging requirements shall be as specified in the con
12、tract or order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to contact the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements are maintained by the Inventory Control Points packaging activity
13、with the Military Department or Defense Agency, or within the Military Departments System Command. Packaging data retrieval is available from the managing Military Departments or Defense Agencys automated packaging files, CD-ROM products, or by contacting the responsible packaging activity. 2 Provid
14、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2474b (1) 999990b 2024396 200 MIL-C-24746(SH) AMENDMENT 1 PAGE 25 6.2: Ordering data: Delete “(o) When lumber and plywood do not require fire-retardant treatment (see 5.1.1). (see 5.2.1.1 and 5.3.2). (s
15、ee 5.3.2.1.3). (p) Level of preservation required (see 5.2 and 5.3.3). (9) If container selection is not at the contractors option (r) Level of packing required (5.3 and 5.3.2). (9) Whether shipping containers should be provided with waterproofing (t) Special marking required (see 5.4).” PAGE 27 6.8
16、: Renumber to paragraph 6.9. 6.8: Add as new paragraph: “6.8 Preservation. Preservation should be level A, C, or commercial and cleaned as follows or by an equivalent commercial process as approved by NAVSEA. (a) Cleaninq. (1) The refrigerant system circuit shall be cleaned internally in accordance
17、with the manufacturers standard practice. (2) After the refrigerant system circuit has been cleaned, evacuate and then pressurize with a holding charge of nitrogen to 2 Ib/in2. Seal for shipping.” Preparing activity: Navy - SH (Project 4110-N507) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
