1、 MIL-DTL-29210E 7 April 2009 SUPERSEDING MIL-DTL-29210D 9 May 2003 DETAIL SPECIFICATION HOSE ASSEMBLY, RUBBER, METAL LINED, WIRE REINFORCED, 250 PSIG, SATURATED STEAM SERVICE This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This
2、 specification covers metal lined, wire reinforced, rubber-hose assemblies for conveyance of saturated steam. The working pressure of this hose is 250 pound-force per square inch gauge (psig) (1.72 MPa gauge) at a temperature of 406F (208C). 1.2 Part or Identifying Number (PIN). The PIN consists of
3、the letter M, the basic specification number, a dash, length in feet, hose size, hose end fitting code, hose reinforcement wire type, and seating material, as shown in the following example: M 29210 -25 -200 MF -S C M29210-25-200MF-S describes a hose assembly 25 feet long, 1.5 inch inside diameter,
4、with male and female ends, stainless steel reinforcement wires and copper seating material. Comments, suggestions, or questions on this document should be addressed to: Defense Supply Center, Columbus, Attn: DSCC-VAI, P.O. Box 3990, Columbus, OH 43218-3990, or emailed to FluidFlowdla.mil. Since cont
5、act information can change, you may want to verify the currency of this address information using the ASSIST Online database at http:/assist.daps.dla.mil. Specification numberLength in feet (see 3.3) Hose size code number (see 1.2.2) Hose end fitting code (see 1.2.3)Hose reinforcement wire type (see
6、 1.2.4) Insert material in the female spud (see 1.2.5) M prefixINCH-POUNDAMSC N/A FSC 4720Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 2 1.2.2 Hose size. Hose size is designated by a three-digit code number (see table I). TABLE I. H
7、ose size code number. Hose size code number Hose size, inside dimensions inches (mm) 075 .750 (19.05) 100 1.000 (25.40) 125 1.250 (31.75) 150 1.500 (38.10) 200 2.000 (50.80) 1.2.3 Hose end fittings. Hose end fittings are designated by two code letters (see table II). TABLE II. Hose end fittings. End
8、 fitting code letters End fitting arrangement MF Male one end female other end FF Female both ends MM Male both ends 1.2.4 Hose reinforcement. Hose reinforcement wire is designated by a single letter, see table III. TABLE III. Reinforcement wire. Code Material B Brass S Corrosion resistant wire Z Zi
9、nc-plated high tensile carbon steel wire 1.2.5 Insert material in the female spud. Insert material is designated by a single letter, C- copper insert or P - polymer insert. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3, 4, or 5 of this specific
10、ation. 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 requirements
11、 documents cited in sections 3, 4, or 5 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwis
12、e specified, the issues of these documents are those cited in the solicitation or contract. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 3 FEDERAL STANDARDS FED-STD-H28 - Screw-Thread Standards for Federal Services FED-STD-162 - Hos
13、e, Rubber, Visual Inspection Guide For (Copies of these documents are available online at http:/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. The following documents fo
14、rm 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 A47/A47M - Standard Specification for Ferritic Malleable Iron Castings ASTM A48/A48M - Standard Specification
15、for Gray Iron Castings ASTM A536 - Standard Specification for Ductile Iron Castings ASTM D380 - Standard Test Methods for Rubber Hose ASTM A751 - Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products ASTM D1149 - Rubber Deterioration - Surface Ozone Cracking in a
16、Chamber (Copies of these documents are available online at http:/www.astm.org or from the ASTM International, P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) SAE INTERNATIONAL SAE-AS1933 - Age Controls for Hose Containing Age-Sensitive Elastomeric Material (Copies of these d
17、ocuments are available from http:/www.sae.org/ or from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between this document and the references cited herein the text of this d
18、ocument takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2. 3.2 Mate
19、rials. Materials used shall be free from defects which would adversely affect the performance or maintainability of individual components or of the overall assembly. Materials not specified herein shall be of the same quality used for the intended purpose in commercial practice. Provided by IHSNot f
20、or ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 4 3.2.1 Recycled, recovered materials. Unless otherwise specified herein, all equipment, material, and articles incorporated in the work covered by this specification are to be new and fabricated using mater
21、ials produced from recovered materials to the maximum extent possible without jeopardizing the intended use. The term “recovered materials” 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.
22、 Unless otherwise specified, none of the above shall be interpreted to mean that the use of used or rebuilt products is allowed under this specification. 3.2.2 Wire reinforcement. Reinforcement wire shall be stainless steel, brass- or zinc-plated high tensile carbon steel wire, as specified (see 1.2
23、.4 and 6.2). 3.2.3 Coupling components. All coupling components, except washers and contact surface inserts, shall be cold-rolled steel bar stock or malleable iron in accordance with ASTM A47/A47M, grade 32510, or ductile iron in accordance with ASTM A536, grade 60-40-18 or grade 65-45-12, and shall
24、 be protected with a corrosion-resisting coating. Gray iron castings in accordance with ASTM A48/A48M shall not be acceptable. 3.3 Length. The hose shall be furnished in nominal 25 or 50-foot (7620 or 15240 mm) lengths, exclusive of the couplings, as specified (see 6.2). A tolerance of 1 percent sha
25、ll be permitted when tested as specified in 4.7.1.1. 3.4 Construction. The hose assembly shall be constructed as specified in tables I, II, III, IV, and V, and 3.4.1 through 3.4.3. TABLE IV. Physical requirements for hoses without liner. Size, inside diameter inches (mm) .75 (19.05) 1.0 (25.40) 1.25
26、 (31.75) 1.5 (38.10) 2.0 (50.80) Tolerance, inside diameter, plus or minus inches (mm) +.039 (0.99) -.016 (0.41) +0.047 (+1) -0.016 (-0.41) +0.063 (+2) -0.016 (-0.41) +0.063 (+2) -0.016 (-0.41) +0.063 (+2) -0.016 (-0.41) Outside diameter, minimum Inches (mm) 1.28 (32.51) 1.56 (39.62) 1.84 (46.74) 2.
27、06 (52.32) 2.63 (66.80) Weight per foot, maximum pound (kilogram/meter (kg/m) .80 (20.32) 1.0 (25.40) 1.32 (33.53) 1.80 (45.72) 2.10 (53.34) TABLE V. Physical requirements for metal liner. Hose size, inside diameter inches (mm) Metal liner, inside diameter minimum inches (mm) Metal liner, thickness,
28、 minimum inches (mm) .75 (19.05) .56 (14.22) .010 (0.25) 1.00 (25.40) .81 (20.57) .010 (0.25) 1.25 (31.75) 1.00 (25.40) .010 (0.25) 1.50 (38.10) 1.25 (31.75) .013 (0.33) 2.00 (50.80) 1.75 (44.45) .015 (0.38) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
29、S-,-,-MIL-DTL-29210E 5 3.4.1 Hose body (see figure 1). The hose shall consist of the following: a. A heat-resistant inner tube, properly compounded to resist saturated steam that shall not blister, pit, flake, peel, or popcorn when tested as specified in 4.7.2.4. b. The hose shall be reinforced by t
30、wo or more stainless steel, brass, or zinc-plated high tensile carbon steel wire braids or spirals with a layer of rubber between each braid or spiral. c. A heat-resistant, abrasion-resistant, and ozone-resistant rubber cover. The cover on the hoses shall be perforated after cure with not less than
31、260 holes per 36-inches (914 mm) hose length, e.g. in four rows radially spaced at 90 degrees around the periphery. FIGURE 1. Hose configuration. 3.4.2 Metal liner. The metal liner shall be corrosion resistant steel type 302, 304, 316, or 321. The corrosion resistant steel inner liner shall be unpac
32、ked, fully interlocked, four-wall, flexible tubing, see figure 2. There shall be no sharp edges or burrs on the ends of the metal liner to cause damage to the tube during assembly or in service. The liner shall be allowed to float free within the hose. The physical requirements for the liner shall b
33、e as specified in table V, see 6.4. The liner shall extend along the entire length of the assembly. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 6 FIGURE 2. Interlocked flexible metal tubing. 3.4.3 Hose fittings. Hose fittings shall
34、 be of the long shank, interlocking clamp type, having fingers or lugs on each half of the clamp to grip the collar on the stem, see figures 3 and 4. The fittings shall prevent the stem shank from being pulled forward in relation to the clamp. Each clamp half shall interlock with the other half. FIG
35、URE 3. Male end fitting assembly. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 7 FIGURE 4. Female end fitting assembly. 3.4.3.1 Coupling components. Coupling components shall consist of a serrated stem with a raised continuous colla
36、r, a swivel nut and spud (for female section). Coupling components shall also consist of a two-part interlocking type clamp with two bolts for the .75-inch (19.05 mm) size hose and four bolts for the larger size hoses. 3.4.3.2 Seating surface. The seating surface of the female stem shall be round to
37、 fit the beveled copper insert or polymer insert in the female spud, as specified (see 6.2). There shall be no sharp edges on the nipples or the clamps to cause damage to the tube or cover. When assembled, there shall be provisions for additional take-up of clamps in service. 3.4.3.3 Special stem de
38、sign. The male and female stems shall be designed with rib type right hand spirals at the end of the stem to screw into the stainless steel liners providing positive gripping and retention. The pitch of the rib type spirals shall be.312-inch (7.92 mm) for the 1.5-inch (38.10 mm) and 2-inch (50.80 mm
39、) hose fittings and .25-inch (6.35 mm) for the .75-inch (19.05 mm), 1-inch (25.40 mm), and 1.25-inch (31.75 mm) hose fittings. The spiral on the male and female stems shall be of sufficient length to ensure that part of the metal liner is always under the clamp which provides additional gripping and
40、 retention when the clamps are torqued over the hose (see 6.5). 3.4.3.4 Threads. Female threads on spud and male connections shall be American Standard Taper Pipe (NPT) meeting the requirements of FED-STD-H28. The female threads on the swivel shall be American Standard Straight Pipe (NPSM). Provided
41、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 8 3.5 Strength. 3.5.1 Proof pressure. The hose assembly, complete with metal liner and couplings, shall withstand a proof pressure of 1250 psig (8.6 MPa (gauge) without leakage or other indicatio
42、n of weakness when tested in accordance with 4.7.1.2. 3.5.2 Burst resistance. The hose, without liner, shall not burst at a pressure less than 2500 psig (17 MPa (gauge) when tested in accordance with 4.7.2.5. 3.6 Ozone resistance. The rubber cover shall show no visible cracking under 7X magnificatio
43、n after testing in accordance with 4.7.2.3. 3.7 Steam resistance. When tested as specified in 4.7.2.4, there shall be no delamination of body components, cracks through the cover exposing reinforcement, or weakness of the fittings. The hose shall reveal no flaws, such as blistering, cracking, flakin
44、g, or popcorning of the tube or cover when tested as specified in 4.7.2.4. 3.8 Identification marking. Each length of hose shall be marked in a color that contrasts with the color of the hose cover. Marking shall be non-removable except by mechanical means. The marking shall consist of the manufactu
45、rers name or trademark, the quarter and year of manufacture, MIL-DTL-29210, “250 psig (1724 kpa (gauge), and the word “STEAM”. Letters shall be not less than 0.25-inch (6 mm) high. 3.8.1 Marking tag. A marking tag shall be wired near each end fitting (two tags per length of hose), advising users of
46、all safety precautions to be followed in the use of the hose. The following shall be included on the tag: a. Hose clamps shall be checked for proper application and shall be re-tightened, as necessary, prior to being placed into service. Be sure that clamps are interlocked over the collar on the nip
47、ple and that each clamp half interlocks with the other. b. Hose clamps shall be tightened after the first several hours of steaming of the hose and periodically thereafter. c. The importance of taking up evenly on all bolts to prevent cocking of the hose clamps shall be emphasized. d. Torque require
48、ments for clamp hardware. e. Other operational and maintenance suggestions considered necessary by the hose and end fitting manufacturers. 3.9 Age. Hose assemblies shall meet the age limitation requirements specified in SAE-AS1933. 3.10 Workmanship. Workmanship inspection shall consist of verificati
49、on that the materials, finishes, and construction, specified in table VI, are used in fabricating and manufacturing of the hose and hose assemblies described in this specification. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-29210E 9 TABLE VI. Workmanship. Component Inspection Inspection m
