1、Beneficial comments, recommendations, additions, deletions, clarifications, etc. and any data that may improve this document should be sent to: Commander, Naval Sea Systems Command, ATTN: SEA 05S, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard DC 20376-5160 or emailed to CommandStandard
2、snavy.mil, with the subject line “Document Comment”. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. AMSC N/A FSC 6099 METRIC A-A-59731B September 25, 2012 SUPERSEDING A-A-59731A October
3、1, 2009 COMMERCIAL ITEM DESCRIPTION TUBE FITTINGS, BLOWN OPTICAL FIBER The General Services Administration has authorized the use of this commercial item description, for all federal agencies. 1. SCOPE. This Commercial Item Description (CID) covers the general requirements for blown optical fiber (B
4、OF) tube fittings (straight tube union couplers, tee tube union couplers, reducer couplers, and end caps) that are used to join together two or more BOF tubes or to terminate a single BOF tube. These tube fittings are designed for use inside shipboard equipment and enclosures. 2. CLASSIFICATION. Tub
5、e fittings shall conform to the following configuration and nominal outer diameter. 2.1 Tube fitting configuration. Tube fittings are of the following configurations: a. U = tube union/straight tube coupler b. T = tube tee/tee tube coupler c. EC = tube end cap d. R = reducing tube straight coupler 2
6、.2 Nominal outer diameter of mating tube. The nominal outer diameter of the mating tube is either 8 millimeters or 5 millimeters. 2.3 Pull performance. Standard or enhanced (see 3.3.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59731B 2 3.
7、SALIENT CHARACTERISTICS. 3.1 Design, construction, and dimensions. Design, construction, and dimensions shall be as specified in figures 1, 2, 3, and 4; table I; and table II. FIGURE 1. BOF tube union/straight tube coupler (configuration U). NOTE: C diameter refers to the internal bore diameter (rep
8、resented by dashed lines). A ( se e t a b l e 1 )A ( se e t a b l e 1 )A ( se e t a b l e 1 )B ( se e t a b l e 1 )B ( se e t a b l e 1 )C ( se e t a b l e 1 )D ( se e t a b l e 1 )FIGURE 2. BOF tube tee/tee tube coupler (configuration T / TS). NOTE: C diameter refers to the internal bore diameter (
9、represented by dashed lines). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59731B 3 FIGURE 3. BOF end cap (configuration EC). FIGURE 4. BOF tube reducing straight coupler (configuration R). TABLE I. Tube fitting dimensions. A Dimension Max B D
10、iameter Max C Diameter D Diameter Tube Fitting Configuration 8 mm 5 mm 8 mm 5 mm 8 mm 5 mm 8 mm 5 mm U (tube union/straight tube coupler) 52 40 18.5 12 6.0 - 6.5 3.0 - 3.2 N/A N/A T (tube tee/tee tube coupler) 26 N/A 18.5 N/A 6.0 - 6.5 N/A 6.0 - 6.5 N/A TS (small bore tee tube coupler) 26 N/A 18.5 N
11、/A 6.0 - 6.5 N/A 0.1 N/A EC (tube end cap) 20 20 18.5 12 N/A N/A N/A N/A NOTES: 1. Dimensions are in millimeters. 2. C diameter is tube fitting internal bore diameter. A dimension (see table II) B2 dia (see table II) B1 dia (see table II) C1 dia (see table II) C2 dia (see table II) Provided by IHSNo
12、t for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59731B 4 TABLE II. BOF tube reducing straight coupler dimensions. Tube Fitting Configuration A Dimension Max B Diameter Max C Diameter B1 (8 mm end) B2 (5 mm end) C1 (8 mm end) C2 (5 mm end) R (Reducing tube straigh
13、t coupler) 43 18.5 12 6.0 - 6.5 3.0 - 3.2 NOTES: 1. Dimensions are in millimeters. 2. C diameter is tube fitting internal bore diameter. 3.2 Materials. 3.2.1 Nonmetallic materials. Nonmetallic materials shall not be affected by the use of alcohol based cleaning solutions. Nonmetallic materials shall
14、 not degrade when the tube fitting is operated under the environmental conditions defined herein. 3.2.2 Metallic materials. Metallic materials shall be corrosion resistant. Dissimilar metals shall not be used in intimate contact unless suitably finished to prevent electrolytic corrosion. 3.2.3 Toxic
15、 and hazardous products and formulations. The products used in the tube fitting construction shall not give off toxic or explosive fumes when exposed to flame. Materials used shall have no adverse effect on the health of personnel when used for the intended purpose. 3.2.4 Fungus. When tested in acco
16、rdance with MIL-STD-1678-3, Measurement 3401.1, for a duration of 28 days, tube fitting materials shall show sparse or very restricted microbial growth and reproduction with minor or inhibited substrate utilization. There shall be little or no chemical, physical, or structural change detectable. 3.2
17、.5 Flammability. When tested in accordance with UL 94, the material(s) of the tube fittings external body shall have a rating of V-1. All other components of the tube fitting shall have a rating of HB. 3.2.6 Sealing compounds. If utilized, sealing compounds shall not flow at the maximum specified st
18、orage temperature or exhibit cracking at the minimum specified storage temperature. 3.2.7 Lubricants. If utilized, lubricants used shall be permanent and shall not require replacement during the lifetime of the tube fitting. Lubricants shall be useful over the environmental conditions specified here
19、in. 3.2.8 Tube retention mechanism. Tube retention mechanisms shall utilize metallic materials. 3.3 Mechanical properties. 3.3.1 Tube pull-out. When tested in accordance with TIA-455-6, the tube fitting shall sustain a static tensile load not less than 67 Newtons (15 pounds) applied for 1 minute bet
20、ween the tube fitting and a BOF tube from an approved MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable. Tube ends shall be fully seated within the tube fitting at the beginning of the test. The use of retaining clips or equivalent on the tube fitting release mechanism is not allowed. After the test, t
21、he tube fitting shall meet the operational pressure sealing requirements specified herein. Upon visual examination, there shall be no evidence of physical damage detrimental to the operation of the tube fitting or the polymer tube. For enhanced pull performance of straight tube couplers and tee tube
22、 couplers (see 7.2), the movement of the tube end within the tube fitting during the pull test shall be not greater than 0.5 millimeters. 3.3.2 Impact. When dropped eight times onto a steel block from a height of 1.5 meters, tube fittings shall show no visual evidence of physical damage detrimental
23、to the operation of the tube fitting. After the test, the tube fitting shall meet the operational pressure sealing requirements specified herein. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59731B 5 3.3.3 Mating durability. When subjected to
24、10 mate/demate cycles, the tube fitting seals and tube capture mechanisms shall maintain physical integrity. Mated tube fitting/polymer BOF tube (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. The same tubing shall
25、 be used and shall not be cut back for all 10 cycles. After the last mate/demate cycle the tube fitting may be cleaned using compressed air or with a dry cotton swab to remove tube shavings. After the test, the tube fitting shall meet the tube pull-out and operational pressure sealing requirements h
26、erein. Upon visual examination, there shall be no evidence of physical distortion or other physical damage detrimental to the operation of the tube fitting. 3.4 Environmental properties. 3.4.1 Temperature ranges. The tube fitting shall operate over a temperature range from 28 to +65 C and shall be c
27、apable of withstanding storage under temperatures from 40 to +70 C. 3.4.2 Temperature cycling. When tested for 5 cycles in accordance with MIL-STD-1678-3, Measurement 3301, the tube fitting shall withstand exposure to cyclical temperatures between the operating temperature extremes. Mated tube fitti
28、ng/polymer BOF tube (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. During one high temperature extreme and one low temperature extreme the tube fitting shall be demated and mated from the polymer tubes a minimum o
29、f two times. At the high and low temperature extremes and after the exposure, the tube fitting shall meet the operational pressure sealing requirements specified herein. Upon visual examination, there shall be no evidence of physical distortion, separation of bonded surfaces, or other physical damag
30、e detrimental to the operation of the tube fitting. 3.4.3 Temperature/humidity cycling. When tested for 10 cycles in accordance with MIL-STD-1678-3, Measurement 3302, the tube fitting shall withstand exposure to cyclical temperature in the presence of high humidity. Mated tube fitting/polymer BOF tu
31、be (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. The sub-cycle shall be included in the test. At the high and low temperature extremes and after the exposure, the tube fitting shall meet the operational pressure
32、sealing requirements specified herein. After the test, the tube fitting shall be demated from and mated with the polymer tubes a minimum of two times, after which it shall meet the operational pressure sealing requirements specified herein. Upon visual examination, there shall be no evidence of dete
33、rioration of component parts or materials, physical distortion, corrosion of metals, separation of bonded surfaces, or other physical damage detrimental to the operation of the tube fitting. 3.4.4 Life aging. When tested for 240 hours at 110 C in accordance with MIL-STD-1678-3, Measurement 3303, the
34、 tube fitting shall withstand exposure to accelerated aging conditions. Mated tube fitting/polymer BOF tube (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. When using tubing from MIL-PRF-85045/25 or MIL-PRF-85045/2
35、6 BOF cable, testing may be conducted for 480 hours at 100 C. After the exposure, the tube fitting shall meet the operational pressure sealing and tube pull-out requirements specified herein. After the test, the tube fitting shall be demated from and mated with the polymer tubes a minimum of two tim
36、es, after which it shall meet the operational pressure sealing requirements specified herein. Upon visual examination, there shall be no evidence of deterioration of component parts or materials, physical distortion, cracking, separation of bonded surfaces, or other physical damage detrimental to th
37、e operation of the tube fitting. 3.4.5 O-ring material aging. Change in o-ring material elongation shall be collected and reported when dry-air aged in accordance with ASTM D573 for 70 hours at 125 C. 3.4.6 Thermal shock. When tested for 5 cycles over the storage temperature extremes in accordance w
38、ith MIL-STD-1678-3, Measurement 3304, Test Condition C-0, the tube fitting shall withstand cyclical exposure to the defined storage temperature extremes. Mated tube fitting/polymer BOF tube (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be
39、used for test purposes. After the exposure, the tube fitting shall meet the operational pressure sealing requirements specified herein. Upon visual examination, there shall be no evidence of deterioration of component parts or materials, physical distortion, separation of bonded surfaces, cracking,
40、or other physical damage detrimental to the operation of the tube fitting. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A-A-59731B 6 3.4.7 Vibration. When tested in accordance with TIA-455-11, Test Condition II, the tube fitting shall withstand ex
41、posure to sinusoidal vibration over frequencies from 5 to 500 Hertz (the frequency range for Test Condition II shall be extended to a low frequency of 5 Hertz). From 5 to 55 Hertz the vibration amplitude shall be 1.52 millimeters double amplitude. Acceleration levels shall be 10 gravity units from 5
42、5 to 500 Hertz. Alternatively, to obtain shipboard approval only, testing can be conducted in accordance with TIA-455-11, Test Condition I where the frequency range for Test Condition I shall be extended to a low frequency of 5 Hertz. Mated tube fitting/polymer BOF tube (tubing from MIL-PRF-85045/25
43、 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. There shall be no tube detachment during the test. During and after the exposure, the tube fitting shall meet the operational pressure sealing requirements specified herein. Upon visual examinati
44、on, there shall be no evidence of broken, loose, deformed, or displaced parts, cracks, chips, or other physical damage detrimental to the operation of the tube fitting. 3.4.8 Shock. When tested in accordance with MIL-S-901, Grade A, Class I, Type B, the tube fitting shall withstand exposure to shipb
45、oard shock levels. Mated tube fitting/polymer BOF tube (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. The use of retaining clips or equivalent on the tube fitting release mechanism is not allowed. There shall be n
46、o tube detachment during the test. After the exposure, the tube fitting shall meet the operational pressure sealing requirements specified herein. Upon visual examination, there shall be no evidence of broken, loose, deformed, or displaced parts, cracks, chips, or other physical damage detrimental t
47、o the operation of the tube fitting. 3.4.9 Pressure withstand. When the tube fitting is subjected to an internal pressure not less than 1724 kilopascals (kPA) (250 pounds per square inch (psi), the tube fitting shall maintain physical integrity. Mated tube fitting/polymer BOF tube (tubing from MIL-P
48、RF-85045/25 or MIL-PRF-85045/26 BOF cable, polyethylene, or equivalent) assemblies shall be used for test purposes. The pressure shall be maintained for a minimum of 30 seconds. There shall be no tube detachment during the test. Upon visual examination, there shall be no evidence of broken, loose, d
49、eformed, or displaced parts, cracks, or other physical damage detrimental to the operation of the tube fitting. 3.4.10 Operational pressure sealing. When the tube fitting is subjected to an internal pressure not less than 234 kPa (34 psi), the tube fitting shall exhibit no leakage (including leakage at tube fitting to mating tube interfaces). Mated tube fitting/polymer BOF tube (tubing from MIL-PRF-85045/25 or MIL-PRF-85045/26 BOF cable, p
