1、 MIL-DTL-27267D 9 January 2012 SUPERSEDING MIL-DTL-27267C 26 September 2003 DETAIL SPECIFICATION HOSE, CRES WIRE REINFORCED, POLYTETRAFLUOROETHYLENE, 450F, MEDIUM PRESSURE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This sp
2、ecification covers the requirements for a hose, CRES reinforced, polytetrafluoroethylene, 450F, medium pressure (see 3.5.1). 1.2 Part or Identifying Number (PIN). The hose PIN consists of the letter M, the basic specification number, hose dash size, blank or reinforcement code “Z”, a dash, hose leng
3、th, a dash, and hose length tolerance in 1/8thfraction of an inch or the letter B (for bulk hose) or S (for lengths of single hose). M27267 -16Z 096 -6 PIN examples: M27267-8-014-5 (size 8 hose 14 5/8 inches long) M27267-16Z-050-B (size 16 hose double braded 50 feet bulk length) M27267-4-025-S (size
4、 4 hose 25 feet specific length) AMSC N/A FSC 4720 Comments, suggestions, or questions on this document should be addressed to: DLA Land and Maritime, Columbus, Attn: VAI, P.O. Box 3990, Columbus, OH 43218-3990, or emailed to FluidFlowdla.mil. Since contact information can change you may want to ver
5、ify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. INCH-POUND Hose dash size (see table II and 3.4.2) Length in inches or feet (see 1.2.1.1 or 1.2.1.3) M prefix Specification number Fractional lengths in 1/8 inch increments (0 thru 7) (see 1.
6、2.1.2) or B or S for bulk lengths (see 1.2.1.3 and 1.2.1.4) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27267D 2 1.2.1 Hose lengths. 1.2.1.1 Lengths of single hose. Lengths of single hose are represented by inches and fraction of an inch.
7、 1.2.1.2 Fractions. Fractions are expressed in 1/8 inch increments (0 through 7). Not applicable to bulk or specific hose lengths. 1.2.1.3 Bulk hose lengths. Bulk hose lengths are represented by the letter B or S and are in feet. Bulk lengths “B” are in supplied as various ranges of lengths. Increme
8、nts in percent are specified in table I. TABLE I. Percentage of hose length per full order. Dash sizes Lengths above 14 ft Lengths ranging from 3 to 14 ft 1/ -4, -5, -6, and -8 65% minimum 35% maximum -10, -12, and -16Z 55% minimum 45% maximum -20Z and -24Z 40% minimum 60% maximum 1/ Hoses of 3-foot
9、 lengths should not be more than 5 percent of the full order. Example: If 100 feet of bulk hose is ordered the manufacturer may supply hose lengths of 5, 6, 14, 15, 20, and 40 feet. 33.33% of the order has lengths 3 to 14 feet and 66.67% of the order has lengths longer than 14 feet. 1.2.1.4 Specific
10、 length. The “S” designator is used to define specific continuous lengths in feet (see 3.4.5.1). Note: For the inch designator insert the number zero in front of the designator for lengths less than 100 inches. Examples: When 12 7/8 length is required the designator is: 012-7 When 96 inches is requi
11、red the designator is: 096-0 When 95 feet total length is required the designator is: 095-B When 35 feet continuous length is required with a tolerance of 1% the designator is: 035-S 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of thi
12、s specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified re
13、quirements documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27267D 3 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The fo
14、llowing specifications, standards and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. DEPARTMENT OF DEFENSE SPECIFICATIONS MIL-DTL-25579 - Hose Assembly, Tetrafluoroethyl
15、ene, High Temperature Medium Pressure MIL-DTL-27272 - Fittings, Polytetrafluoroethylene, High Temperature, Medium Pressure, General Specification for MIL-PRF-680 - Degreasing, Solvent MIL-PRF-5606 - Hydraulic Fluid, Petroleum Base; Aircraft, Missile and Ordnance MIL-PRF-7808 - Lubricating Oil, Aircr
16、aft Turbine Engine, Synthetic Base MIL-PRF-83282 - Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft, Metric, NATO Code Number H-537 MIL-PRF-87257 - Hydraulic Fluid, Fire Resistant; Low Temperature, Synthetic Hydrocarbon Base, Aircraft and Missile. DEPARTMENT OF DEFENSE STANDARD
17、MIL-STD-130 - Identification Markings of U.S. Military Property (Copies of these documents are available online at https:/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.3 Non-Government publications.
18、The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. ASTM INTERNATIONAL ASTM D471 - Rubber Property - Effect of Liquids ASTM D792 - Density and Specific Gravity
19、(Relative Density) of Plastics by Displacement ASTM D4895 - Polytetrafluoroethylene (PTFE) Resin Produced from Dispersion (Copies of these documents are available from http:/www.astm.org/ or ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, Pennsylvania, USA 19428-2959.) NCS
20、L INTERNATIONAL NCSL Z540.3 - Requirements for the Calibration of Measuring and Test Equipment (Copies of these documents are available online at http:/www.ncsli.org or from NCSL International 2995 Wilderness Place, Suite 107 Boulder, Colorado 80301-5404.) Provided by IHSNot for ResaleNo reproductio
21、n or networking permitted without license from IHS-,-,-MIL-DTL-27267D 4 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) ISO 17025 - General requirements for the competence of testing and calibration laboratories (Copies of these documents are available email at http:/www.ansi.org or from the AN
22、SI Customer Service Department, 25 W. 43rdStreet, 4thFloor, New York, NY 10036.) SAE INTERNATIONAL SAE-ARP1153 - Determining Relative Specific Gravity Polytetrafluoroethylene Tubing, Method for SAE-AS2078 - Hose Assemblies, Polytetrafluoroethylene (PTFE), Test Methods SAE-AS1946 - Hose Assembly, Pol
23、ytetrafluoroethylene, Metallic Reinforced, Up to 1500 psi and 450 Degrees F, Hydraulic and Pneumatic (Copies of these documents are available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), http:/www.
24、sae.org.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in event of a conflict between the text of this document and the references cited herein the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unle
25、ss a specific exemption has been obtained. 3. REQUIREMENTS 3.1 Qualification. The hoses furnished under this specification shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.4 and 6.3). 3.2 Components. T
26、he hose shall consist of a PTFE tube reinforced with a CRES steel wire braid. 3.3 Materials. Materials shall conform to the requirements specified herein. Materials which are not covered by this specification, or which are not specifically described herein, shall be of the quality appropriate for th
27、e purpose intended. (see 6.1). 3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and
28、 promotes economically advantageous life cycle costs. 3.4 Design and construction. 3.4.1 Tube. The tube shall be a seamless, uniformly gauged extrusion of virgin PTFE resin. The base resin shall conform to ASTM D4895 except for the specific gravity requirement (see 3.5.2.4). Additives may be include
29、d in the compound from which the tube is extruded. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27267D 5 3.4.2 Reinforcement. The reinforcement for the hose shall be braided CRES wires. Hoses under size -16Z shall have a single layer of br
30、aid while size -16Z and above shall have two layers of braid. The letter “Z” is used to indicate that two layers of wire braiding are required. The arrangement of the wires over the tube shall provide sufficient strength to ensure conformance to the requirements specified herein. Hoses with broken o
31、r missing reinforcing wires shall be cause for rejection; however, hoses with crossed-over reinforcing wires shall not be accepted. 3.4.3 Hose end fittings. Hose shall be designed to connect with reusable fittings in accordance with MIL-DTL-27272 and with permanent fittings in accordance with MIL-DT
32、L-25579 and its applicable specification sheets. 3.4.4 Dimensions. The cross section of the hose shall meet the requirements specified in table II. TABLE II. Hose dimensional requirements. 1/ 2/ Dash size ID inch (mm) Tube wall thickness inch (mm) Over braid OD inch (mm) -4 .188 (4.78) .015 (0.38) .
33、040 (1.02) + .007 (0.18) - .005 (0.13) .312 (7.92) + .031 (0.79) - .008 (0.20) -5 .250 (6.35) .040 (1.02) .375 (9.53) + .031 (0.79) - .008 (0.20) -6 .313 (7.95) .040 (1.02) .446 (11.33) + .023 (0.58) - .016 (0.41) -8 .406 (10.31) .043 (1.09) .562 (14.27) + .023 (0.58) - .016 (0.41) -10 .500 (12.70)
34、.047 (1.19) .656 (16.66) + .031 (0.79) - .015 (0.38) -12 .625 (15.88) + .020 (0.51) - .010 (0.25) .047 (1.19) .789 (20.04) .023 (0.58) -16Z .875 (22.23) + .031 (0.79) - .024 (0.61) .047 (1.19) 1.109 (28.17) .031 (0.79) -20Z 1.125 (28.58) .050 (1.27) 1.359 (34.52) .031 (0.79) -24Z 1.375 (34.93) .031
35、(0.79) .070 (1.78) 1.672 (42.47) .035 (0.79) 1/ Dimensions are in inches. 2/ Metric equivalents are given for information only. 3.4.5 Length of bulk hose. 3.4.5.1 S designator for specific bulk hose lengths. When the order is for a specific length in feet, a tolerance of 1% of the required length sh
36、all be used. 3.5 Performance. 3.5.1 Operating temperature and pressure. The hose shall operate in the temperature range of -65F to 450F (-54C to 221C) when assembled in class 1 hose assemblies in accordance with MIL-DTL-25579. The maximum operating pressure shall be as specified in table III. Provid
37、ed by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27267D 6 TABLE III. Hose sample sizes and test conditions. 1/ Hose Size Length of 6 samples for impulse test inches (mm) Length of 10 samples for all other tests inches (mm) 2/ Operating pressure psi
38、(MPa) Proof pressure psi (MPa) Room temperature burst pressure psi (MPa) High temperature burst pressure psi (MPa) Bend radius inches (mm) -4 14.0 (355.6) 18.0 (457.2) 1500 (10.3) 3000 (20.7) 12000 (82.7) 7000 (48.3) 2.00 (50.8) -5 16.0 (406.4) 18.0 (457.2) 1500 (10.3) 3000 (20.7) 10000 (68.9) 6500
39、(44.8) 2.00 (50.8) -6 18.0 (457.2) 18.0 (457.2) 1500 (10.3) 3000 (20.7) 9000 (62.1) 6500 (44.8) 4.00 (101.6) -8 21.0 (533.4) 18.0 (457.2) 1500 (10.3) 3000 (20.7) 8000 (55.2) 6000 (41.4) 4.63 (117.6) -10 23.5 (596.9) 18.0 (457.2) 1500 (10.3) 3000 (20.7) 7000 (48.3) 5500 (37.9) 5.50 (139.7) -12 27.5 (
40、698.5) 18.0 (457.2) 1000 (6.9) 2000 (13.8) 5000 (34.5) 3500 (24.1) 6.50 (165.1) -16Z 18.0 (457.2) 18.0 (457.2) 3/ 1250 (8.6) 2500 (17.2) 5000 (34.5) 3500 (24.1) 7.38 (187.5) -20Z 18.0 (457.2) 18.0 (457.2) 3/ 1000 (6.9) 2000 (13.8) 4000 (27.6) 3000 (20.7) 11.00 (279.4) -24Z 18.0 (457.2) 18.0 (457.2)
41、3/ 1000 (6.9) 2000 (13.8) 4000 (27.6) 3000 (20.7) 14.00 (255.6) 1/ Metric equivalents are given for information only. 2/ The number of samples required for qualification is specified in 4.4.1 and table VI. 3/ Samples for the low temperature flexibility and the vacuum tests shall be 30 inches (762 mm
42、) long for these sizes. 3.5.2 Tube. The extruded PTFE tube shall meet the following requirements. 3.5.2.1 Tube roll and tube proof pressure. The tube shall not leak, split, burst, or show any evidence of malfunctioning when tested in accordance with 4.6.2.1. 3.5.2.2 Tensile strength. When tested in
43、accordance with 4.6.2.2, the longitudinal tensile strength for all sizes of tubes shall be not less than 3000 psi (21 MPa). The transverse tensile strength for sizes 10 and larger shall be not less than 2500 psi (17 MPa). For sizes under -10, the transverse tensile strength need not be tested. 3.5.2
44、.3 Elongation. Elongation of the tube shall be not less than 200% when tested in accordance with 4.6.2.2. 3.5.2.4 Specific gravity. When tested in accordance with 4.6.2.3, the apparent specific gravity of the tube shall be not greater than 2.155 and its relative specific gravity shall be not greater
45、 than 2.210 for all sizes of tubes. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-27267D 7 3.5.2.5 Tube conductivity. When tested in accordance with 4.6.2.4, tube sizes -4 through -8 shall conduct a direct current of not less than 10 A. Tub
46、e sizes -10 through -24Z shall conduct a direct current of not less than 20 A. 3.5.3 Hose and hose assembly. The hose (braid reinforced PTFE tube) or the hose assembly, consisting of the hose assembled with end fittings (see 3.4.3), shall meet the following requirements. 3.5.3.1 Braid flare. When te
47、sted in accordance with 4.6.3.1, the length of hose shall pass, by its own weight, through a ring of applicable inside diameter specified in table IV. TABLE IV. Braid flare dimensional requirement. 1/ 2/ Hose dash size Hose Nominal ID inches (mm) Expansion diameter inches (mm) Maximum flare diameter
48、 - ring ID inches (mm) -4 .188 (4.80) .230 (5.84) .500 (12.70) -5 .250 (6.35) .300 (7.62) .560 (14.22) -6 .313 (7.95) .370 (9.40) .625 (15.88) -8 .406 (10.31) .475 (12.07) .750 (19.05) -10 .500 (12.70) .585 (14.86) .875 (22.23) -12 .625 (15.88) .720 (18.29) 1.000 (25.40) -16Z .875 (22.23) .995 (25.2
49、7) 1.400 (35.56) -20Z 1.125 (28.58) 1.270 (32.26) 1.700 (43.18) -24Z 1.375 (34.93) 1.545 (39.24) 1.950 (49.53) 1/ Dimensions are in inches. 2/ Metric equivalents are given for information only. 3.5.3.2 Proof pressure. When subjected to the applicable proof pressure specified in table III and tested in accordance with 4.6.3.2, the hose shall not leak or fail during or at the completion of testin
