1、MIL-G-38OLB 5b 9 799990b 0232448 2 m MIL-G- 18014B(StiIPS) - 15 March 1967 SUPERSEDING 15 January 1958 (See 6.2 and 6.3) MIL-CI- 180 14A(SHlPS) MILITARY SPECIFICATION GRATINGS, METAL, BAR TYPE FLOORWG, NAVAL SHIPBOARD 1. SCOPE 1.1 Scope. - - This specification covers open, bar-type gratings, (floori
2、ng), for shipboard use. 1.2 Classification. - Gratings shll be of the following types, classes, and styles, as cpeciiied, (see 6. i). Type A - Steel, heavy duty, galvanized. Type B - Aluminum alloy, light duty. Class a - Lightweight. Class b - Heavyweight. Class a - Lightweight. Style 1 - Riveted. S
3、tyle 2 - Interlocked. 1.2. 1 When the style of type B, class a, gratings is not specified, style 1 shall be furnished (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the
4、extent specified herein. SPECIFICATIONS FEDERAL QQ-A-200/4 - Aluminum Alloy Bar, Rod, Shapes and Tube, Extruded, 5083. QQ-A-200/5 - Aluminum Alloy Bar, Rod, Shapes and Tube, Extruded, 5086. QQ-A-200/6 - Aluminum Alloy Bar, Rod, Shapes and Tube, Extruded, 5454. QQ-A-200,Q - Aluminum Alloy Bar, Rod, S
5、hapes and Tube, Extruded, 5456. QQ-A-200/8 - Aluminum Alloy Bar, Rod, Shapes and Tube, Extruded, 6061 and 6062. QQ-A-200/9 - Aluminum Alloy Bar, Rod, Shapes and Tube, Extruded, 6063. QQ-A-225/7 - Aluminum Alloy Bar, Rod and Wire; Rolled, Drawn or Cold Finished, 5052. QQ-A-225/8 - Aluminum Alloy Bar,
6、 Rod, Wire and Special Shapes; Rolled, Drawn, or Cold QQ-A-250/6 - Aluminum Alloy, 5083, Plate and Sheet. QQ-A-250,hl - Aluminum Alloy, 5086, Plate and Sheet. QQ-A-250/8 - Aluminum Alloy, 5052, Plate and Sheet. QQ-A-250/9 - Aluminum Alloy, 5456, Plate and Sheet. QQ-A-250/10 - Aluminum Alloy, 5454, P
7、late and Sheet. QQ-A-250/11 - Aluminum Alloy, 6061, Plate and Sheet. MIL-2-17871 - Zinc-Coating (Hot-Dip Galvanizing). Finished, 6061. MILlTARY STANDARDS MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD- 163 - Steel Mill Products Preparation for Shipment and Storage. i FSC 5620-, Pro
8、vided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RIL-G-180148 5b 997970b 0212irir9 4 m MIL-E i801 rolled or drawn, or high tensile 3.1.2 Type B. - Type B gratings shall be made of aluminum alloy conforming to the chemical require- alloy steel, rolled or
9、drawn. ments of the applicable specification (see 2.1). When the material is not specified, the manufacturer may furnish any of these materials (see 3.2.1). , 3.2 General. - 3.2.1 The grating panel sizes shall be as specified (see 6. I). Where nonrectangular shapes, or cutouts in rectangular panels
10、are required, they shall be as shown on the drawings as specified, (see 6. i). In gen- eral, the edges of nonrectangular shapes and cutouts where more than four bearing bars are included, shall be finished with banding bars of the same depth as the bearing bars. The banding bars shall be welded to t
11、he bearing bars of the grating at least every other bearing bar and in every corner. Intervening bearing bars shall be tack welded. Where banding bars are for general appearance or finish only, welding to every fourth bearing bar will be permitted. The ends of 6000 series aluminum grating panels sha
12、ll be finished or banded by means of spacers or bridges to preclude welding. The 5000 series aluminum may be welded. shall be of the same material and be finished in the same manner as the gratings, shall not extend above the surface of the gratings, and shall be of such construction as to provide m
13、eans for holding and securing the gratings to the supporting structure, with adequate simplicity of installation and for removal and replacement in service. 3.2.2 Clamps or other fastenings shall be provided when specified (see 6. I). Such clamps or fastenings 3.2.3 The thickness and spacing of all
14、bearing bars, and the depth, thickness, and spacing of all cross or reticuline bars shall be adequate to support the loads specified in 3.5 without deflection due to bending, and without lateral displacement, warping or distortion of any of the parts greater than O. 2 inch and without permanent set
15、greater than O. 008 inch (see 4.3.5). 3.3 Construction. - 3.3.1 Reticular. - Gratings shall be reticular, flush topped, and constructed of straight parallel bear- ing bars, placed edgewise and joined by reticuline bars, or cross bars. For steel gratings, reticuline bars or cross bars shall be secure
16、d to the bearing bars by riveting, welding, or interlocking joint construction (see table I); for aluminum gratings, style 1, securing shall be by riveting only (see table I); for aluminum gratings, style 2, securing shall be by interlocking only (see table I). 3.3.2 Spacing of bearing bars. - The s
17、pacing between the bearing bars shall not exceed 1-7/8 inches from center to center of adjacent bars. For gratings of the type where the reticuline bars are not parallel cross bars and bent or crimped to contact the latter bars at intervals at which they are fastened to the bear- ing bars by rivets
18、or welding, the spacing of rivets or welds shall not exceed 7 inches; for gratings of the type where the reticuline bars are parallel cross bars secured to the bearing bars by clamping, welding, or interlocking joint construction, the spacing of the cross bars shall not exceed 4 inches. 3.3.3 Tolera
19、nces. - Tolerances will be permitted as follows: Length of bearing bars - plus or minus 1/16 inch in 6 feet. Depth of bearing bars - plus or minus 1/32 inch. (When measured from bottom of serrations Width of grating panels - plus or minus 1/8 inch. when present, ) A tolerance of plus 10 percent will
20、 be permitted on the maximum weight of any individual grating when ba ing bars or fasteners, or both, form a pari of the grating. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-LBOLYB 5b 999990b 02312q50 O 525 MIL-E 18014B(SHIFS) 3.4 Dimensi
21、ons. - The depth of the bearing bars shall be 1 inch within the tolerance specified in 3.3.3. 3.4.1 Class a. - The thickness of bearing bars for class a gratings shall be not less than 1/6 inch. 3.4.2 Class b.- The thickness of bearing bars for class b gratings shall be not less than 3/16 inch. 3.5
22、W. - The load requirements of the gratings shall be as shown in table I. The depth of cross bars or reticuline bars shall not exceed 1 inch. Table I - Load requirements. 3.50 Type, class and style rype A, ciassa- welded, interlocked or riveted rype A, class b - welded, interlocked or riveted rype B,
23、 class a, style 1 or 2 300 300 175 l i 900 i 5.00 3.6 Zinc-coating (galvanizing). - Unless otherwise specified in the contract or order, steel gratings shall be completely and evenly zinc-coated (galvanized) by the hot-dip process in accordance with ML-2-17871 after fabrication. 3.6. 1 The coating s
24、hall not flake off when tested as specified in 4.3.4. 3.7 Workmanship. - Gratings shall be accurately fabricated and free from warps, twists, or other de- fects affecting the appearance of serviceability. The bars from which the gratings are fabricated shall be sound, of uniform quality and conditio
25、n, and free from harmful nonmetallic inclusions, segregations, pipes, laps, cracks, twists, seams, damaged ends and other injurious defects. The workmanship shall be first class in every respect. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. - Unless otherwise specified in the c
26、ontract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any cornrnerical laboratory acceptable to the Government. The Government reserves the right to
27、perform any of the inspections set forth in the speci- fication where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Sampling for quality conformance inspection. - 4.2.1 M. - For purposes of sampling, a lot shall consist of all gratings
28、of the same type, class, Size 4.2.1. 1 Gratings shall be selected in accordance with table II or III, as applicable, for the inspection of 4.3. 1 through 4.3.5. Any sample grating having one or more defects shall be subject to rejection. If the number of gratings rejected exceeds the acceptance numb
29、er shown in table II or In, as applicable, this shall be cause for rejection of the entire lot. A rejected lot may be resubmitted for examination and tests after the manufacturer has repaired the entire lot and corrected all non-conforming gratings. and style offered for delivery at the same time. n
30、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G- 18014B(SHIPS) Acceptance number (defective) Lot size Sample size I/ number of number of gratings or gratings or quare feet 1 i I square feet Tabk II - Sampling for visual, weight, dimensional, 8
31、nd zinc adherence (regular shapes). _ - - Reject ion number (defective) , I - I O 1 2 I 1- 1 to 9 1 10 to 25 63 to 160 161 to 410 1001 to 2560 1 2561 to 6250 I 6251 to 16000 I i 411 26t062 to 1000 - I 1 2 3 All 8 13 20 32 50 80 I 125 I 200 I - - I- - - _ - - _- Lot size Regular shapes Irregular shap
32、es and cutouts Pieces or Sample, I/ Acceptance?/ Sample/ I Acceptance 81 square feet pieces or constant (k) pieces or , constant (k) square feet square feet !3 to 40 301 to 500 AlWhen ordered by square feet, no more than 5 square feet of the sample shall be in any one grating. l 3 1.45 3 1.45 3 1.45
33、 4 1.45 j 1.62 10 1.72 5 1.53 7 1.62 i 15 1 1.79 I Table - Sampling for visual, weight, dimensional, and zinc adherence (irregular shapes and cutouts). Rejection i number of gratings or i gratings Or ! (defective) 1 (defective) i 1 square feet Lot size I Sample size/ 1 Acceptance square feet number
34、of 1 number number I I -. I 1 to 9 4 10 to 25 j 26 to 62 1 63 to 16 i 6251 to 16000 1 161 to 410 I i 411 to 1000 1001 to 2560 2561 to 6250 1 I I 1 - I - I I 2 3 6 8 125 10 11 1 2 5 7 I I 3 4 All 13 20 32 50 80 I I I I 15 I 22 200 14 315 21 I IlWhen ordered by square feet, no more than 5 square feet
35、of the sample shall be in any one grating. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-U- 18014B(SHIPS) Table IV - Sampling for test of deflection under load, and permanent set (contd. ). Lot size Pieces or square feet - 501 to 800 801 to 1
36、,300 1,301 to 3,200 3,201 to 8,000 8,001 to 22,000 110,001 to 550,000 550,001 and over 22,001 to 110,000 Regular shapes I I Irregular shapes and cutouts Sample, Acceptance?/ Sarnplej/ Acceptance?/ 1 pieces or constant (k) , square feet square feet pieces or constant Q) 4 10 15 20 25 30 35 35 35 1.72
37、 20 1.79 25 1.82 30 1.85 40 1.86 50 1.89 15 1.89 100 1.89 150 ! 1.82 i. 85 1.86 1.89 i 1.93 1.98 2.00 2.03 .!I When ordered by square feet, no more than 5 square feeof the sample shall be in any one unit. 21 Acceptability criterion: The lot shall be accepted if (U-X)/s is greater Gan (k) the accepta
38、nce constant. U is the specification upper limits (see 3.2.3 and table-I). X is the sum of the measurements like (1x1 divided by the number of samples (n) or X=XX/n. The lot standard devation(s) is equal to the following formula: t n- Where: EX2 is the sum of squared measurements. is the sum of meas
39、urements squared. 4.3 Examination and tests. - 4.3.1 Each sample grating shall be examined to determine conformance with this specification. Partic- ular attention shall be given to dimensions, squareness, flatness, and clamps and fastenings. 4.3.2 Each sample zinc-coated grating shall be surface ex
40、amined after galvanizing to determine con- 4.3.3 Weight. - Each of the sample gratings selected in accordance with 4.2.1.1 shll be weighed to formance with 3.6. determine czmance with table I. 4.3.4 Each of the sample gratings selected in accordance with 4.2. 1. 1 shall be struck a hard glancing blo
41、w with a straight peen or scaling hammer having all edges ground to a radius of not less than 3/64 inch and weighing approximately one pound. 4.3.5 Load test. - The sample gratings selected in accordance with 4.2.1.2 shall be supported by two supports with bearing width not to exceed 1 inch. These s
42、upports shall be placed 3 feet apart. The gratings shall be tested with the load specified for the type and class in accordance with table I, suspended from a bar placed midway between the supports. The bar shall not have a bearing width on the grating greater than 2 inches. Deflection and permanent
43、 set shall be determined by gages. 4.4 Possible test failures. - Possible test failures are defined as follows: (a) Weight test: (b) Load test (c) Impact test: (1) Weight of finished grating not within maximum allowed. (1) Deflection and permanent set not within allowable limits when grating is subj
44、ected to load test. (1) Grating does not withstand prescribed impact test. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-G- 18014B(SHIPs) 5. PREPARATION FOR DELIVERY 5.1 Packing.- 5.1.1 Levels A and B. - Gratings, separated for type, class,
45、 size and style, shall be packed for ship- ment in secux lifts on nominal 2 by 4 inch skids. Skidding and strapping shall be in accordance with MIL- STD-163. The maximum gross weight per lift shall not exceed 6,000 pounds for steel grating and 3,000 pounds for aluminum grating. 5.1.2 Level C. - The
46、gratings shall be prepared for shipment in accordance with commercial practice to insure ca%e=cceptance and safe delivery at destination, and shall meet, as a minimum the requirements of carrier rules and regulations applicable to the mode of transportation. shall be inaccor&Gah-MIL-STD-129. Nomencl
47、ature shall be the exact nomenclature for the part or item that has been approved under the contract or order. 5.2 Marking for shipment. - Unless otherwise specified in the contract or order, marking for shipment 6. NOTES 6.1 Ordering data. - Procurement documents should specify the following: (a) T
48、itle, number, and date of this specification. (b) Type and class of gratings required (see 1.2). (c) When type B, class a, gratings are ordered, the style required (see 1.2.1). (d) Size of grating panels and drawings required (see 3.2. 1). (e) Whether clamps or fastenings are required (see 3.2.2). W
49、elding is not allowed on 6000 series (f) Level of packing required (see 5.1.1). aluminum. 6.2 When other than bar type gratings are required, MIL-G- 18015 should be used. When the intended use does not restrict the type of grating, either MIL-G- 18015 or this specification should be used. 6.3 CHANGES FROM PREVIOUS ISSUE. THE EXTENT OF CHANGES (DELETIONS, ADDITIONS, ETC. ) PRECLUDE THE ANNOTATENFTHE INDIVIDUAL CHANGES FROM THE PREVIOUS ISSUE OF THIS DOCUM
