1、MIL-C-24604(SH) 21 April 1981 MILITARY SPECIFICATION CYLINDER, HIGH PRESSURE AIR, FIBERGLASS REINFORCED PLASTIC (FRP), METAL LINED Tnis specification is approved for use by the Naval Sea Systems Command, Department of the Navy, ana is applicable for use by all Departments ana Agencies of tne Departm
2、ent of De,fense. 1. SCOPE 1.1 Scppe. Tnis specification ccjvers fiberglass filament reinforceu pl-astir, cyli-naers laving metal liners. 1.2 Classification. Cylinders shall be of tne following types as speciflea (see X. 1 ana G. 2. I): 2. APPLICABLE DOCIJMENTS 2.1 Issues of aocuments. The following
3、aocuments, of the issue in effect on date of invitation for bids or request for proposal, form a part of tnis specification to the extent specifieu herein. SPECIFICATIONS FEDERAL PPP-B-601 - Boxes, Wooa, Cleatea-Plywood. PPP-B-621 - Boxes, Wooa, Nailea ana Lock-Corner. PPP-B-636 - Boxes, Shipping, F
4、iberboard. PPP-B-640 - Boxes, Fiberboara, Corrugateu, Triple-Wall. MILITARY MIL-P-1 16 - Preservation-Packaging, Methoas of. MIL-C-5541 - Chemical Conversion Coatings on Alilminilm ana MIL-L-10547 - Liners, Case, ana Sneet, Overwrap: Water- MIL-P-17549 - Plastic Laminates, Fibrous Glass Reinforcea,
5、Aluminum Alloys. Vaporproof or Waterproof, Flexible. Marine Strilc tur al. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILITARY (Continued) MIL-R-21607 - Resins, Polyester, Low-Pressure Laminating, MIL-1-22110 - Inhibitors, Corrosion, Volatile, C
6、rystalline. MIL.-P-23377 - Primer Coating; Epoxy Polyamide, Chemical MIL-P-24441/2 - Paint, Epoxy-Polyamide, Exterior Topcoat, Haze Gray, Formula 151. MIL-C-47257 - Compound, Epoxy, Filament Winding. MIL-R-60346 - Roving, Glass, Fibrous (For Filament Winding Fire-Retardant. and Solvent Resistant. Ap
7、plications). STANDARDS FEDERAL - FED-STD-406 - Plastic, Methods of Testing. MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-130 - Identification Marking of U.S. Military MIL-STD-147 - Palletized Unit Loads for 40“ x 48“ Pallets. MIL-STD-167-1 - Mechanical Vibrations of Shipboard Equ
8、ipment (Type I - Environmental and Type II - In- ternally Excited). MS26545 - Cylinder, Compressed Gas, Nonshatterable. Property. (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific acquisition functions should be obtained from the con
9、tracting activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. UNIFORM
10、CLASSIFICATION COMMITTEE AGENT Uniform Freight Classification Ratings, Rules and Regulations. (Application for copies should be addressed to the Uniform Classi- fication Committee Agent, Tariff Publication Officer, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) NATIONAL MOTOR FREIGHT TRAF
11、FIC ASSOCIATION, INC. AGENT National Motor Freight Classification. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION Computer Code NASA CR-72124 - Computer Program for the Analysis of Filament Wound Reinforced Metal Shell Pressure Vessels - May, 1966. ,I O a a Provided by IHSNot for ResaleNo reproductio
12、n or networking permitted without license from IHS-,-,-flIL-C-ZLIb04 19 m 99999Ob 0293175 b H MIL-C-24604 (SHI (Application forcopies should be addressed to the National Aero- nautics and Space Administration, Washington, DC 20546.) (Technical society and technical association specifications and sta
13、ndards are generally available for reference from libraries. They are also distributed among technical groups and using Federal agencies.) ._ . . 3.1. . Prior to beginning production, sample - cyl.inders.shal1 be examined and tested as specified in 4.3 (see 6.3). Ability o-f the cylinders to meet th
14、e performance and. environmental require- -Bents 0.f .this specification shall be aemonstrated by the first article inspection. Materials, design, or construction shall not be altered - :. . _. rollowing first article acceptance. . . 3.2“ Design and construction. 3.2.1 Design. lne cylinders shall co
15、nsist of fiberglass filaments impregnated with a thermosetting plastic resin and wound on a metal liner. The metal liner shall not be stressed above its elasirc limit at cylinder pneumatic pressure up to proof pressure: the liner shall not be stressed above 95 percent of its compressive yield streng
16、th, cylinder unpressurized; and the maximum strength in the glass filaments at the 6300 pounds per square inch (lb/in2), 160F operating pressure shall not exceed 30 percent of the filament stress at virgin hyarostatic burst pressure of the cylinder. Stresses shall be computed by tne Compirter Code N
17、ASA CR-72124, or otner equivalent analytic techniques. 3.2. l. 1 Operating characteristics. Operating characteristics of the cylinder shall be as follows: (a) Operating pressure - Normal room temperature (75OF 2 5OF) - 5000 lb/in2 - High temperature (160F) - 6300 lb/inz - Low temperature (minus 2OoF
18、) - 3700 lb/in2 (b) Proof pressure - 7500 lb/in2 (minimum) (c) Bu;.st pressure - 15,000 lb/in2 (minimum) (a) Temperature range - Minus 20F to 160F (e) Useful cyclic life (without liner leakage) - 500 fill cycles or 100 fill cycles plus 3500 temperature cycles from minus 20F to 160F (f) Dynamic fatig
19、ue life - 10 years (g) Leakage less than 5 percent pressare in 10 years 3.2.1.2 Physical characteristics. Physical characteristics shall be as follows: (a) Port fitting - 302, 304 or 316 series CRES 1-1/8 inch 12-UNF-3A external thread (port fitting detail shall be in accordance with detail “Xgg of
20、M526545 for internal and external dimensions). “ 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-!.IL-C-24.604 (SHI Type 1 Type II (b) Outside diameter 5.75 inches maximum 6.75 inches maximum (c) Length (overall) 20.5 inches maximum 23.5 inches max
21、imum (dl Weight (overall) . 14 lb maxim.um 20 lb m.atimum (e) Internal volume. 250 in3 + 5 in3 455 in3 + IO or (f) Sh-a-pe .- Cylinder envelope shall be cylindrical in accordance -5 in3 with .MS26545 . 3.2.2 M.aterials. The-:cyl.inder shall be construoted. of a liner of aluminum al.loy (see 3.2.7) r
22、einforced with. continuous filament glass fibers in accordance with type III or IV, class .I of MIL-R-60346 and epoxy or polyester resin .in accordance with MIL-C-47257 or MIL-R-21607, respec- tively. A resin system composed of Dow Chemical DER 332 and curing agent nYtr, or equal, may be used. 3.2.2
23、.1 Material deter,iora$ion. Materials shall not deteriorate when subjected to the environmental conditions specified herein. 3.2.2.2 Liner. Metal liner shall be aluminum alloy UNS A96061, O temper, h-eat treated to T6 condition after final forming. Otner metals or alloys ma.y be proposed to the comm
24、and or agency concerned. Metal liner material, design, and fabrication process shall not be altered from that demonstra-ted to have acceptable life by first article inspection. Liner alloy and fabrication process shall be identified on the detail drawings, and in the first article inspection report
25、(see 4.3.2.1). No fissure or other defect is acceptable that is likely to weaken the finished cylinder. Smooth and uniform surface finish is required, no interior folding in the neck area of the liner is permitted; smooth gathering of the material in the neck is acceptable. 3.2.2.3 Recovered materia
26、ls. Unless otherwise specified herein , all equipment, matrial, and articles incorporated in the products covered by this specification shall be new and shall be fabricated using materials produced from recovered materials to the maximum extent practicable without jeopardizing the intended use. The
27、term “recovered materialsn means materials which have been collected or recovered from solid waste and reprocessed to become a source of raw materials, as opposed to virgin raw materials. None of tine above shall be interpreted to mean that the use of used or rebuilt products is allowed under this s
28、pecification unless otherwise specifically specified. 3.2.3 Process details. The following process details shall be followed in the fabrication of the cylinders: (a) Guide rolls shall be not less than 2 inches in diameter for dry roving and not less than 1-1/2 inches in diameter for resin impregnate
29、d roving to avoid unnecessary chafing and fle.xing of the glass filaments. come into sliding contact with any elements of the winding machine, with the exception of the 2 inch diameter guide bar at the entrance of the resin pan. (b) Under no circumstances shall dry roving be permitted to 4 Provided
30、by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-(c) Wetting time shall be not less than 0.5 second, if the wet-winding process is used. (d) A Prony-brake device or an eddy-current brake device or equivalent device shall be used to maintain the proper tension
31、in the glass roving during winding. 3.2.4 Process contro.1. A rigid process control shall be established and maintained to ensure compliance with the following conditions: (a) Completely impregnated roving. (b) Average resin content of the full wall thickness at any point, between 17 and 30 percent.
32、 Resin content of not less than 15 percent in any sample (see 4.6.12). (c) Filament tension schedule such that the inner plies of the glass filaments (roving) are not deformed out of their initial configuration by succeeding plies of roving. 3.2.5 Void content. Void content shall not exceed an avera
33、ge of 7 percent for all determinations on any cylinder when tested as specified in 4.6.13. Void content for any single determination shall not exceed 8 percent. 3.2.6 Protective coatings. 3.2.6.1 Metal coating and assembly. All surfaces of the liner not covered with fiberglass laminate shall be coat
34、ed with MIL-C-5541 chemical treatment. After treatment is air dry, the port fitting shall be assembled y into the cylinder opening with ttOtl-ring seal equal to C. E. Conover and $4 Company part number 3-912, and tightened to a torque of 360 to 420 inch- pounds (in-lb). Within 10 hours of applicatio
35、n of the MIL-C-5541 treat- ment, exterior metal surfaces (not inside screw threads) on the blank end of the cylinder and on the port end, including the port fitting up to approximately 1/16 inch onto the wrench flats, shall be coated with MIL-P-23377 material to a dry film thickness of 0.5 mil to 0.
36、75 mil: (if 10 hours is exceeded the surfaces shall be solvent cleaned immediately prior to the MIL-P-23377 application). Within 24 hours of application of MIL-P-23377 materal, the coated metal surfaces shall be given two coats of formula 151 (gray) of MIL-P-24441/2. Each coat shall be 6 to 8 mils d
37、ry film thickness. At the port end, the objective is to coat exposed aluminum and to continue the coating, as a heavy fillet onto the port fitting, but leaving the major area of the wrench flats and outer end unpainted. Drying time between coats shall be no less than 6 hours or until a “tack free“ s
38、tate is achieved. 3.2.6.2 B-arrier coating. A transparent moisture-barrier coating shall be applied to the exterior surface of the cylinder. The coating shall be sufficiently flexible to resist crazing, cracking, blistering or separation during pressure and environmental testing required herein. 3.2
39、.7 Volume (for internal volumes, see 3.2.1.2). Volume shall be determined after the volumetric expansion test (see 4.6.1). 3.2.8 Structural strength. The cylinder shall have ample strength and rigidity to withstand 250 percent of maximum wrench torques as . specified in 3.2.6.1 without permanent def
40、ormation of the cylinder. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-C-24604 L7 H 7797906 Ofi3L78 L M . MIL-C-24604(SH) 3.3 Perforpance. 3.3.1 Volumetric expansion. First article inspection and production cylinders shall not have residual
41、expansion greater than 10 percent of the elastic expansion when tested as specified in 4.6.1. The first 25 production cylinders shall not have an elastic expansion that exceeds by more than 10 percent the-maximum acceptable value determined in the first article inspection. The standard deviation sha
42、ll be calculated for elastic expansion for the first article cylinders and for the first 25 production cylinders as a combined sample, Subsequent production cylinders shall not exceed the average elastic expansion for the combined sample by more than three times the standard deviation. Elastic expan
43、sion is the total expansion less the residual expansion. 3.3.2 Leakage. The rate Of leakage of the cylinder shall not exceed one cubic centimeter (cm3 per hour at any temperaturs within the design temperature range wnen tested as specified in 4.6.3. 3.3.3 Endurance. The cylinders, when tested as spe
44、cified in 4.6.6, shall show no deterioration, T:ne first cylinder shall meet 3.3.2 and shall be capable of withstanding a hydrostatic burst pressure of not less than 2.2 times room temperature operating pressure. The.second cylinder shall withstand a hydrostatic burst pressure of not less than 9450
45、1b/in2 (1.5 times 1600F, operating pressure of 6300 lb/in2). 3.3.4 Thermal-shock and pneumatic leakage, The cylinders subjected to the thermal shock test of 4.6.5 shall show no deterioration and snall subsequently pass the pneumatic leakage tests (see 4.6.3.1 and 4.6.3.2). 3.3.5 Vibr.ation and pneum
46、atic 1-eakage. The cylinder shall meet the vibration requirements of MIL-STD-167-1, type I. The cylinder shall show no deterioration upon completion of the test in 4.6.4. 3.3.6 Fragmentation resistance. The cylinder shall be resistant to fragmentation when penetrated by a projectile, The cylinder, w
47、hen tested as specified in 4.6.8, shall remain in one piece, and the greatest dimension of the opening (cut plus tear) created by the projectile shall not exceed the dimension of one hole (cut) created by the projectile by more than 3 inches in any direction. ICutting shall be considered as. the act
48、ual section of the cylinder cut by contact with the projectile, and a “tear1! shall be considered as any extension beyond the cut. 3.3.7 Soak cycle. After subjection to the soak cycle test (see 4.6.9). the cylinder shall withstand a hydrostatic burst pressure of not less than 2.2- times room tempera
49、ture operating pressure. 3.3.8 Pressure storage. The cylinder subjected to the pressure stora.-ge test (sek 4.6.10) shall- withstand a hydrostatic burst pressure of not less than 2.2 times room temperatuve operating pressure. 3.3.9 Humidity cycle, The cylinder subjected to the humidity cycle test (see 4.6. Tl) shall subsequently pass the hydrostatic burst test at a minimum pressure of 2.2 times the room temperature operating pressure. 6 O O O Provided by IHSNot
