1、MILITARY SPECIFICATION HOSE ASSEMBLIES, CORRUGATED STEEL, 200 LB/IN AND 425OF MAXIMUM STEAM SERVICE RATING This specification is approved for use by the Naval Sea Systems Command and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specifica
2、tion covers coupled flexible metal hose of either helical or annular corrugated type construction for steam service up to 200 pounds per square inch (lb/in ) and 425OF. 2 1.2 Classification. (see 6.2.1T: Hose assemblies shall be of the following classes, as specified Class S - Standard material. Cla
3、ss NM - Nonmagnetic material. 2. APPLICABLE DOCUMENTS 2.1 Issues of documents. The following documents, of the issue in effect on date of invitationmi= or request for proposal, form a part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL QQ-C-390 - Copper Alloy Castings (
4、Including Cast Bar). QQ-S-698 - Steel, Sheet and Strip, Low Carbon. QQ-W-423 - Wire, Steel, Corrosion-Resisting. PPP-B-585 - Boxes, Wood, Wirebound. PPP-B-601 - Boxes, Wood, Cleated-Plywood. PPP-B-621 - Boxes, Wood, Nailed and Lock-Corner. MIL-P-116 - Preservation-Packaging, Methods of. MIL-B-121 -
5、Barrier Material, Greaseproofed, Waterproofed, Flexible. MIL-B-16444 - Bronze, Hydraulic, Ounce, Metal Castings. MIL-B-16541 - Bronze, Valve Castings. MIL-1-17214 - Indicator, Permeability; Low-MU (GO-NO-GO). MILITARY STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by
6、Attributes. MIL-STD-129 - Marking for Shipping and Storage. , (Copies of specifications, standards, drawings, and publications required by contrac- tors in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) Benefi
7、cial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Ship Engineering Center, SEC 6124, Department of the Navy, Washington, DC 20362 by using the self-addressed Standardization Document Im
8、provement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 4720 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-LLhOC 47 777470b 0273024 2-i MIL-H-18160C (SH) 2.2 Other ublications. The following documents, form a
9、 part of this specification to the extzpEcified herein. invitation for bids or request! for proposal shall apply. Unless otherwise indicated, the issue in effect on date of AMERICAN IRON AND STEEL INSTITUTE (AISI) Steel Products Manual. (Application for copies should be addressed to the American Iro
10、n and Steel Institute, 1000 16th Street, N. W., Washington, DC 20036.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) B61 - Steam or Valve Bronze Casting. B62 - Composition Bronze or Ounce Metal Castings. (Application for copies should be addressed to the American Society for Testing and Material
11、s, 1916 Race Street, Philadelphia, PA 19103.) NATIONAL BUREAU OF STANDARDS Handbook H28 - Screw Thread Standards for Federal Services. (Application for copies should be addressed to the Superintendent of Documents, Govern- ment Printing Office, Washington, DC 20402.) UNIFORM CLASSIFICATION COMMITTEE
12、 Uniform Freight Classification Ratings, Rules, and Regulations. (Application for copies should be addressed to the Uniform Classification Committee Agent, G. F. Earl, Tariff Publication Officer, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) available for reference from libraries. and us
13、ing Federal agencies.) (Technical society and technical association specifications and standards are generally They are also distributed among technical groups 3. REQUIREMENTS be 3.1 Sample for first article ins ection. Prior to beginning production a sample shall examined as specified innd te:ted a
14、s specified in 4.3 (see 6.4). 3.2 Materials. Materials shall be as specified in table I. TABLE I. Materials. Class S Class NM Pressure carrier Cold rolled steel, Corrosion-resistant steel, AISI type 321 QQ-S-698 or 304; with a maximum permeability not greater than 2.0 after fabrication. Wire braid r
15、einforce- Corrosion-resisting Corrosion-resistant steel, AIS1 type 321 300 series not greater than 2.0 after fabrication. ment steel, QQ-W-423, or 304; with a maximum permeability Wire guard Steel, commercial Half round, commercial brass. grade AISI- SAE 1010, galvanized- 1/ Aluminum Aluminum. Coupl
16、ings Malleable iron Cast bronze, MIL-B-16444, QQ-C-390, /The amount of zinc on the wire guard shall be sufficient to pass the salt spray corro- Carbon steel alloy 922, ASTM B61 or ASTM B62. sion test specified in 4.3.6. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without l
17、icense from IHS-,-,-MIL-H-LL60C Ll7 = 9999906 0273025 Ll W MIL-H-18 16 OC (SH) 3.2.1 3.3 Construction. Hose shall consist of a corrugated pressure carrier (see 3.3.1), Reclaimed material shall be used to the maximum extent possible. braided reinforcement (see 3.3.2), and a protective wire guard (see
18、 3.3.3). Each length shall be complete with a mechanical coupling (see 3.3.4) on each end. 3.3.1 Pressure carrier. Pressure carrier shall be close pitch corrugated, one ply or multi-ply having either annular or helical corrugations. Construction, design wall thickness and number of corrugations shal
19、l be such as to allow hose to meet all requirements of this specification. 3.3.2 Braided reinforcement. Braided reinforcement shall be firmly seoured by the end couplings and shall not have any loose wires protruding which would interfere with the tightness of the coupling. 3.3.3 Protective wire gua
20、rd. Each hose shall have a protective wire guard helically wound outside the braid. The guard may be attached by mechanical means, brazing or welding. The guard may be fabricated of either half round steel or brass wire having a diameter of not less than 5/32-inch or 1/8-inch by 3/8-inch aluminum st
21、rip. Pitch and spacing of the guard shall be such as to provide maximum protection to the reinforcing braid while not adversely affecting the performance of the hose as specified herein. Class NM must use either brass or aluminum. 3.3.4 Couplings. Hose shall include a coupling on each end securely f
22、astened by brazing or welding. Couplings shall be male tapered pipe threads in accordance with Hand- book H28. Size of the pipe thread iron pipe size (i.p.s.) shall be the same as that of the hose (hose inside diameter). shall have a magnetic permeability of 2.0 or less after fabrication when tested
23、 in accordance with 4.3.7. 3.4 Size. Hose shall be of the sizes shown in table II, as specified (see 6.2.1). This size corresponds to the nominal clear inside diameter of the innerpressure carrier. 3.3.5 Magnetic permeability. All materials used in the fabrication of class NM hose TABLE II. Physical
24、 requirements. size Inches 1-1/4 1-1/2 Inside diameter pressure burst (minimum) (minimum) Inches 21 I 2600 26 1800 30 35 44 1000 Hydro- static proof test (minimum) 3.5 Lengths. Unless otherwise specified (see 6.2.1), the length of hose shall be 50 feet + 2 inches including couplings. Lengths shall b
25、e continuous and shall contain not more than 1 circumferential joints. 3.6 Proof pressure. Where tested as specified in 4.3.2 hose shall show no evidence of 3.7 Flexing. When tested as specified in 4.3.3, hose shall show no signs of leakage, 3.8 Tension. When tested as specified in 4.3.4 hose shall
26、show no evidence of wire 3.9 Burst. After completion of the tension test (see 4.3.4) hose shall be subjected to wire breakage, coupling slippage, or other deformation. wire breakage or other deformation. braid brea- pulling away from end coupling. the burst -of 4.3.5 and shall not burst below the pr
27、essure specified in table II. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-LLbOC Li7 W 7779706 0273026 b MIL-H-18160C (SHI 3.10 Corrosion. After completion of the tension test (see 4.3.4) and burst test (see 4.3.5) hose shall be subjected
28、to the corrosion test of 4.3.6. indication of corrosion. 3.11 Marking. Hose shall not show any 3.11.1 Couplinq. Each coupling shall be permanently marked with the contractors name or trademark, the size and “200 1b/in2“. as not to damage the coupling nor affect its performance. 3.11.2 Hose. coupling
29、 advim users of maintenahce and safety precautions. shall be included: This marking shall be done in such a manner Each length of hose shall have a marking tag wired to the hose at each The following precautions (a) Do not twist flexible hose. (b) (c) Do not exceed working pressures stamped on attac
30、hed coupling. Do not bend to a diameter smaller than the minimum inside bending diameter specified for the size involved. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for ins ection. Unless otherwise specified in the contract, the contractor is responsiblefor the performance of all inspection
31、requirements as specified herein. Except as otherwise specified in the contract, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. any of the inspections set forth in the specific
32、ation where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The Government reserves the right to perform 4.2 Classification inspections. Inspection requirements specified herein are class- ified as follows: (a) First article inspection (see 4
33、.3). (b) Quality conformance inspection (see 4.4). 4.3 First article inspection. First article inspection shall be conducted at the activity, as specified (see 6.2.1). The first article inspection shall consist of the exam- ination specified in 4.5 and the tests swecified in 4.3.1. 4.3.1 First artic
34、le Sam les. Samples of class S hose assemblies shall be submitted as follows for Fheiemcified in 4.3.2 through 4.3.6. offered-then class NM will be ,tested. If only class NM hose is being (a) Two lengths each of hose in sizes 1 and 2 inches inside diameter complete (b) One length each sizes 1 and 2
35、inches inside diameter hose complete with withcouplings attached. The overall length shall be not less than 15 feet for the tests spec.ified in 4.3.2 and 4.3.3. couplings attached, the overall length shall be not less than 5 feet (ex- . clusive of couplings).for the tests specified in 4.3.4 through
36、4.3.6. Class S hose sises 1 and 2 inches, submitted as specified in 4.3.1 which have 4.3.1.1 been tested and have satisfactorily passed the tests specified in 4.3.1 shall also qualify class NM and all other sizes of hose. 4.3.2 ;roof ressure tests. jected to .the hydrEstatic proof pressure specified
37、 in table II for a period of 15 minutes. A noncorroding test fluid shall be used. After successfully passing the hydrostatic proof pressure test, hose shall be coiled into a circle of the bend diameter specified in table II. The coil shall be rolled the entire length of the hose 10 times while being
38、 subjected to a hydrostatic pressure of 200lb/in . tested with a minimum pressure of 10 lb/in air while under oil or water to detect any signs of leakage or for any other weaknesses. If water is used as an alternative to oil to detect leakage, assemblies shall be thoroughly dried to remove entrapped
39、 moisture. After hoses have successfully passed the test specified in 4.3.2, they shall be subjected to flexing tests on a flexing device as shown on figure 1. Hose shall be bent to the bend diameter specified in table II. jected to a minimum of 25,000 cycles and the 2-inch size hose shall be given
40、a minimum of Samples submitted as specified in 4.3.l(a) shall be sub- 2 After completion of the coiling test, hose shall be 2 4.3.3 Flexing e. One inch size hose shall be sub- 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-H-LLhOC q7 W 777770b
41、 0273027 A m MIL-H-18160C (SH) 15,000 cycles of flexure while under 200 lb/in2 and 425OF. steam service conditions. shall be cycled at the rate of 20 cycles per minute. Flexing shall continue until leakage, failure or other weakness occurs. 4.3.4 Tension test. Samples submitted as specified in 4.3.l
42、(b) shall be subjected to Hose 2 a 1500 pound tensile pull while under a hydrostatic pressure of 200 lb/in . be subjectedtohedrostatic burst pressure specified in table II and held for a period of 15 minutes. While under this pressure hose shall show no leakage or any other signs of weakness. After
43、the minimum burst pressure has been met, the pressure shall be increased until failure occurs. test (see 4.3.5) shallbesubjected to a salz spary test for 18 consecutive hours, using a 4 percent sea salt solution, to determine if the coating is of sufficient thickness to resist atmospheric corrosion.
44、 4.3.5 Burst test. After completion of the tension test specified in 4.3.4, hose shall 4.3.6 Corrosion test for zinc-coated ( alvanized). Hose section used for the burst Sample shall be properly cleaned with gasoline to remove grease and dirt. 4.3.7 Ma netic permeabilit (class Nf.1 hose only). Magne
45、tic permeability sha 4.4 Quality conformance inspection. 4.4.1 K. determined in %cordance with MI-I-17214, - All hose assemblies of the same class and size presented for del one time shall be considered a lot. 1 be . very at 4.4.2 Sam lin for examination and proof pressure tests. A random sample of
46、hose lengths shall b: se!exd from each lot in accordance with inspection level III of MIL-STD- 105 and shall be subjected to the examination of 4.5 and the test of 4.6.1. The acceptance quality level (AQL) shall be 1.0 percent. If any sample fails to pass the examination or test, the entire lot shal
47、l be rejected. be selected fro: eazhTtTth-urst test specified in 4.6.2. pass the test, the entire lot, from which the sample was selected, shall be rejected. following: 4.4.3 Sam lin for burst test. A 5-fOOt length of hose, with couplings attached, shall If the sample fails to 4.5 Examination. Sampl
48、es selected in accordance with 4.4.2 shall be examined for the (a) Loose or broken braid wire. (b) (c) Couplings as specified. Wire guard as specified and securely attached.: 4.6 Tests. 4.6.1 Proof ressure tests. Hose selected in accordance with 4.4.2 shall be subjected A noncorroding test fluid sha
49、ll be to the hydro-cproof prEe specified in table II. used. After successfully withstanding this test, all samples shall be coiled into a circle of the diameter specified in table II. The coil shall be rolled the entire length of the hose while being subjected to 200 lb/in2 hydrostatic pressure. 4.6.2 Burst test. Hose, with couplings attached, selected in accordance with 4.4.3 After the minimum burst pressure has been met, the pressure shall be increased shall be subjectedrthe hydrostatic
