1、M I L-B-5 1 254(MU) 12 December 1966 M - (See section 6) MILITARY SPEC IF IUT ION BREATHING APPARATUS, OXYGEN GENERATING, M20 1. SCOPE 1 ,l This specification covcrs one type of self-contained oxygen-generating breathing apparatus, which is back mounted. 2. APPLICABLE DOCUMENTS 2.1 Government docume
2、nts. The following documents of the issue in effect on the date of invitation for bids or request for proposal form a part of this specification to the extent specified herein: SPECiF ICATIONS FEDERAL N N -P-O05 15 CCC-T- 191 PPP- 8-566 PPP-B-601 PPP-B-636 PPP-B-665 MILITARY MIL-P-116 MIL-A-13550 -
3、Plywood, Container Grade. - Textile Test Methods. - Boxes, Folding, Paperboard. - Boxes, Wood, Cleated-Plywood. - Boxes, Fiberboard. - Boxes; Paper board , Me ta I Stayed (Incl ud ing Stay Material). - Preservation, Methods of. - Antifogging Kit, M1. MIL-C-17671 = Canister, Oxygen Breathing Apparatu
4、s. G-. , P. THIS DOCUMENT CONTAINS I PAGES. . z -0. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-51254 42 W 9737306 O234850 5 STANDARDS FEDERAL FED-STD-595 - Colors. MIL ITARY M IL- ST D - 1 05 M IL-STD- 129 - Marking for Shipment and Storag
5、e. MIL-STD-130 - Identification Marking for US Military Property. MIL-STD-289 - Visual Inspection Guide for Rubber Sheet Material. MIL-STD-407 - Visual Inspection Guide for Rubber Molded Items. - Sampling Procedures and Tables for Inspection by Attributes. PUBLICAT IONS DEPARTMENT OF THE ARMY TECHNI
6、CAL MANUALS TM 3-4240-212- 15 - Operator, Organizational, Field, and Depot Main- tenance Manual for Breathing Apparatus, Oxygen Generating, M20. Repair Parts and Special Tool List for Breathing Apparatus, Oxygen Generating, M20. TM 3-4240-212-25P- Organizational, Field, and Depot Maintenance (Copies
7、 of specifications, standards, drawings, and pub1 cations required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer .) 2.2 Other publications. The following document forms a part of this specifi- c
8、ation 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 CLASSIFICATION COMMITTEE Un iform Freight Class if i cation (Appl icaf ion for copies of these ratings, rules, and regulations should be a
9、ddressed to Uniform Classification Committee, 202 Union Station, 516 West Jackson Boulevard, Chicago, Illinois 60606.) . , . ,.,q:t?.cwt I;. 1. i_, . *. a :,*.-. i . : -. : . . _, . . . . 2 OJ .; Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-._ MIL
10、-B-5325q 42 W 797790b 0234853 7 MI L-B-5 1 254(MU) 3. REQUIREMENTS 3.1 Design. The apparatus shall be a permissible, one hour type, self- contained, oxygen-generating, breathing apparatus, US Bureau of Mines Approval No. 1307, modified as follows (see 6.3): 3.1.1 Speech diaphragm. The apparatus shal
11、l not have a speech diaphragm. 3.1.2 Cross tube. The cross tube shall be turned toward the back and upward at an angle of 60 * 5 and 30 to 35, respectively. The turned back portion shall start 1-1/2 f 1/2 inch from the center of the tube extended from the face- piece. The turned back portion shall b
12、e 2-1/4 rt: 1/4 inch long. 3.1.3 Inlet and outlet valves. The inlet and outlet valves shall be reversed so that the inlet valve is on the right-hand side of the wearer and the outlet valve. shall be on the left-hand side of the wearer. 3.1.4 Pressure re1 ief valve. A spring-loaded pressure relief va
13、lve shal I be built into the right-hand side turned back portion of the cross tube. The valve shall be turned in toward the facepiece at 40 to 45 from the vertical of the turned back end of the cross tube when the cross tube ends are in a horizontal position. The valve shall be spring loaded and it
14、shall begin to open at no less than 3 pounds applied load and shall be fully opened with an applied load of 13 f 2 pounds when tested as specified in 4.3.4.1(a). The valve shall show no evidence of leakage when subjected to a pressure equal to 6 + 0.5 inch of water for 60 f 15 seconds when tested as
15、 specified in 4.3.4.1(b). 3.1.5 Breathing tubes. The breathing tubes shall be 20 f 1 inch long. 3.1.6 Back-carry harness assembly. The apparatus shall be designed for back carry instead of chest carry. The apparatus shall be provided with an adjustable- fit harness assembly made of polyvinyl idine c
16、hloride (saran) plastic webbing, 2 f 1/4 inch wide for shoulder and chest straps and 1 * 1/8 inch for other straps, for fastening the apparatus securely to the wearers back without discomfort. All harness stitching shall be polyester fiber (dacron) stitching. The harness shall per- mit freedom of mo
17、tion for physical work. The harness material joints shall have a breaking strength of no less than 150 pounds for 2-inch-wide straps, when tested as specified in 4.3.4.2. A cushion pad of approximately 8 inches by 4 inches shall be placed on the lower portion of the unit so that it rests against the
18、 small of the buck of the wearer. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.1.7 Carrying case design and construction. A carrying case shall be pro- vided to retain the apparatus, a spanner wrench to couple and uncouple the hoses, two type
19、I canisters and one type II canister (see 3.1.9)/ instruction booklet or card, an antifogging kit (see 3.l.ll)and a hood (see 3.1.12). Unless otherwise specified in the contract or order, the color of the carrying case shall be green No, 34087 of FED-STD-595. If the case is provided with any metal p
20、arts, they shall be a corrosion resistant metal or metal parts treated with standard commercial treatment for corrosion resistance prior to painting. 3.1.8 Spanner wrench. A spanner wrench shall be provided to couple and uncouple the breathing tubes. 3.1.9 Canisters. Each apparatus shall be provided
21、 with two type I canisters and one type li canister conforming to MIL-C-17671. 3.1.10 Instructions. One copy each of TM 3-4240-212-15 and TM 3-4240- 212-25P shall be included in the carrying case. A copy of the manufacturers instructions shal I be included in the carrying case. 3.1 .lo. 1 Changes in
22、 design. Prior to the initiation of production, the con- tractor shall advise the Government of any changes that affect operating and maintenance instructions or repair parts and special tools list which are in effect at the time of procurement. 3.1 .l 1 Antifogging kit, M1 . An antifogging kit conf
23、orming to MIL-A-13550 shall be packed into the carrying case. 3.1 .12 Hood. - One hood supplied as an accessory shal I be Mine Safety Appl i- once Company part No. 83461 (see 6.4). 3.2 Breathing bag leakage. The breathing bag shall show no evidence of leakage when subjected to a pressure equal to 10
24、 + 0.5 inch of water for 60 f 15 seconds when tested as specified in 4.3.4.3. 3.3 Functioning. The apparatus shall pass the functioning test as specified in 4.3.4.4. 4 n -. f Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-B-5L254 42 E 7779706
25、 0234853 O M MIL-6-51 254(MU) 2 3.4 Identification marking. 3.4.1 Breathing apparatus. Identification marking of the apparatus shall be in accordance with the applicable requirements of MIL-STD-130. The use of a nameplate, properly attached, shall be permitted. 3.4.2 Carrying case. Identification ma
26、rking prescribed in 3.4.1 shall be stenciled on the carrying case lid. Alternatively, a nameplate shall be per- mitted. 3.5 Material. The rubber parts used in the assembly of the breathing appar- atus shall have been manufactured within six months of the date of assembly. 3.6 Preproduction. Prior to
27、 the start of regular production, a preproduction sample of breathing apparatus and harness joints shall be produced in accordance with this specification for examination and test (see 4.2). 3.7 Workmanship. The apparatus shall be free from contamination (grease or oil) and damage (dents, scratches,
28、 or punctures). . 3.7.1 Rubber surfaces. The bag, hoses, and facepiece, shall be free from tackiness, porous areas, cracks, checks, flash, abrasions, and blisters. The rubber shall be compact and free from bubbles and foreign matter. Ridges of moldparting lines, when closely trimmed, shall not be co
29、nsidered as flash. 3.7.2 Metal surfaces. The metal parts shall have no sharp edges which might conceivably injure a wearer, 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. 4.1.1 Suppliers responsibility. Unless otherwise specified in the contract or purchase order, the supplier is
30、 responsible for the performance of all inspec- tion requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government, The Government reserves the right to perform any of the inspections set forth i
31、n the spec.ification where such inspections are deemed neces- sary to assure suppl es and services ,conform to specified requirements , 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-B-51254 42 = 7777706 0234854 2 = 4.1.2 Obiective evidence. T
32、he supplier shall provide objective evidence acceptable to the contracting officer that the requirements of 3.1 and section 5 for which specific inspection has not been provided in this specification have been satisfied. 4.2 Preproduction. 4.2.1 Sample. A preproduction sample of 5 M20 breathing appa
33、ratusand 5 harness joint specimens, 6 inches by full width, shall be manufactured using the same methods, materials, equipment and processes as will be used during regular production. 4.2.2 Inspection. 4.2.2.1 For examination. Sample apparatus shall be examined in accordance with the classification
34、of defects (4.3.3.3). 4.2.2.2 For tests. Sample apparatus and harness joint specimens shall be tested as specified in 4.3.4. 4.2.3 Acceptance/rejection criteria. The preproduction sample shall comply with the examinations and tests specified in 4.2.2 to be acceptable. 4.3 Regular production. 4.3.1 L
35、otting. A lot shall consist of the apparatus or component parts produced by one manufacturer, at one plant, from the same materials, under essentially the same manufacturing conditions. 4.3.2 Sampling. 4.3.2.1 For examination and nondestructive tests. Sampling shall be conducted in accordance with M
36、IL-STD-105. 4.3.2.2 For destructive tests. A sample of 3 harness joint specimens, six inches %by full width, shall be made essentially the same as those in the apparatus and sub- mitted with each lot of apparatus for testing. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted wit
37、hout license from IHS-,-,- - MIL-B-51254 42 7779706 0234855 4 d 4.3.3 Inspection. 4.3.3.1 Examination and nondestructive tests. Sample apparatus and the level A preparation for delivery shall be examined and tested in accordance with the classification of defects an MIL-STD-105. MIL-STD-289 and MIL-
38、STD-407 shall apply as visuul inspection guides for rubber sheet material and rubber molded items. 4.3.3.2 Destructive tests. Sample harness joint specimens shall be tested in accordance with 4.3.4.2. The acceptance number is zero. 4.3.3.3 Classification of defects a t egor i es (a) Breathing appara
39、tus, oxygen generating, M20. Defects Acceptance standards Critica I : None defined Major: AQL 0.25 percent defective 1 o1 102 103 104 1 05 1 06 107 1 08 109 Relief valve spring load 4.3.4.1 (a) Re1 ief valve leakage 4.3.4.1(b) Breathing bag leakage 4.3.4.3 Functioning 4.3.4.4 Component incorrectly l
40、ocated Type or quantity of canisters incorrect Marking missing, incorrect or iliegible Manufacturers instructions missing Workmanship (see 3.7) AQL 1 .O percent defective Minor: AQL 2.5 percent defective - 201 202 203 204 205 Spanner wrench missing Antifogging kit missing Hood missing Contamination
41、on interior or exterior i. of carrying case Color of carrying case incorrect 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-B-51254 42 7777706 023q56 b (b) Preparation for delivery (see section 5). Categories Defects Cri ti Ca I: None define
42、d Major: AQL 2.5 percent defective 1 o1 102 1 03 1 04 . 105 Confainer incorrect or damaged Closure of carrying case or container Packaging method incorrect Cushioning, blocking, or bracing incorrect missing or insufficient to make a tight package or pack Marking missing, incorrect, or illegible 4.3.
43、4 - Tests. Tests shall be conducted as follows: 4.3.4.1 Pressure relief valve. . (a) Spring load. Use a calibrated spring tester adapted for the apparatus and gradually apply a loud to the pressure relief valve. Record the load at which the valve begins to open and the load at which the valve is ful
44、ly opened, (b) Leakage. Assemble, the pressure relief valve to a suitable fixture with an adjustableoxygen supply and a water manometer making certain all connections are airtight. Adjust the oxygen supply to obtain a reading of 6 + 0.5 inch on the water manometer and close off the oxygen supply. Th
45、e pressure relief valve shall show no evidence of presswe drop for 60 f 15 seconds as indicated by the manometer. 4.3.4.2 Strength of harness joint. Determine the strength of the harness joint in accordance with method 5100 of CCC-T-191, except that the test specimen shall be full width by 6 inches
46、long. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-r MIL-B-5125q Li2 W 9797906 0234857 W 4.3.4.3 Breathing bag leakage. Disconnect the two breathing tubes from the breathing bag assembly and instaa rubber stopper in the inhalution elbow. in- sta
47、ll and seat a dummy canister so that it makes an airtight connection. Connect a suitable oxygen source and a water manometer to the top of plunger valve assembly on the breathing bag assuring that all connections are airtight. Adjust the oxygen source to inflate the breathing bag to a pressure equal
48、 to 12 inches of water as measured on the manometer. While inflating, straighten out the breathing bag by kneading and pulling the bag to a fully inflated position. Reduce the pressure to obtain a reading of 10 + 0.5 inch of water on the mano- meter and close off the oxygen source. The breathing bag
49、 shall show no evidence of pressure drop for 60 f 15 seconds as indicated by the manometer. Disconnect the oxygen source, remove the rubber stopper and the dummy canister. . 4.3.4.4 Functioning. Don the facepiece and hoses, adjust the straps if necessary so that the facepiece fits snugly and comfortably against the face. Cover the coupling at the end of the hose on the wearers right-hand si
