1、MIL-STD-746A 31 January 1963 Superseding M I L-STD-746 (W e p) 20 February 1961 MILITARY STANDARD RADIOGRAPH IC TEST1 NG REQUIREMENTS FOR CAST EXPLOSIVES Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-74bA ND m 9977933 0061056 7 W BXI.LPSTD-
2、IMA DEPARTMENT OF DEFENSE Washington 25, D.C. Radiographic Testing Requirements for Cast Explosives WILSTB-746A 1. This stnnciard has been approved by the Department of Defense and is mandatory for usc by tho Departments of the Army, the Navy and the Air Force, effective 31 January 1963. 2. Recommen
3、ded corrections, additions, or deletions should be addressed to Headquarters, DSA, Staiidnrdization Division, Washington 25, D. C. ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTS Pase Paragraph 1 . SCOPE . 1 2 . REFERENCED DOCUMENTS . 1-
4、3. DEFINITIONS . i . 1 4 . GENERAL REQUIREMENTS 1 FIGURES Figure 1 . Penetrameters 5 TABLES I . II . III . Examples of Penetrameter identification . 3 Normal Quality Levels of Inspection . 3 Special Quality Levels of Inspection 3 Provided by IHSNot for ResaleNo reproduction or networking permitted w
5、ithout license from IHS-,-,-MIL-STD-7qbA ND W 7777733 0063058 O W MIGSTD-746A -. 1. SCOPE 1.1 Scope. This standard covers the require- determining the presence of discontinuities ments for radiographic inspecion used in in cast explosives. - 2. REFERENCED DQCUMEIVTS 2.1 The issiie of the following d
6、ocument in effect on the date of invitation for bids, forms a part of this standard : STANDARDS obtained from the procuring agency or as directed by the contracting Officer-) 2.2 Other publications. The following doeu- ment forms a part of this standard. Unless otherwise indicated, the issue in effe
7、ct on MILITARY date of invitation for bids shall apply. . NATIONAL BUREAU OF STANDARDS MIL-STD-23-Nondestructive Testing National Committee on Radiation Pro- (Copies of Specifications, standards, drawings, (Application for copies should be addressed to and publications required by contractors in con
8、nec- the Superintendent of Documents, Government tion with specific procurement functions should be Symbols tection . Pzinting Office, Washington 25, I). C.) 3. DEFINITIONS 3.1 The following definitions are applicable to this standard : 3.1.1 Rad4ographic inspection. The use of X-rays and nuclear ra
9、diation to detect dis- continuities in material and present them on a recording medium, 3.1.2 Recording medium. Film or a detector which converts radiation into a visible image. 3.1.3 Rdiograph. A visible image on film produced by penetrating radiation passing through the material being tested, 3.1.
10、4 Intensifying screens. Sheets of metal or layers of fluorescent crystals between which the film is sandwiched to decrease the exposure time and to improve image quality, 3.1.5 Film holdem or cassettes. Lightproof containers for holding a radiographie film with or without intensifying screens. These
11、 film holders or cassettes gay be rigid or flexible. 3.1.6 Penetrumeter. A fiducial device whose image in the radiograph is used to determine satisfactory radiographic quality. 3.1.7 Source. A machine or radioactive ma- terial which emits penetrating radiation. 3.1.8 Source-film dhtance. The distanc
12、e between the radiation producing area of the source and the film. 4. GENERAL REQUIREMENTS 4.1 General. The radiographic method of inspection in compliance with applicable specifications, drawings, contracts, purchase orders, and shall include the use of all X- and gamma-ray SOurces. 4.1.1 Extent Qf
13、 radiographic inspection, 1 testing is used for determining the presence of discontinuities in cast explosives. Radio- graphic inspection specified herein is intended to apply to all items requiring radiographic - - - -_ Provided by IHSNot for ResaleNo reproduction or networking permitted without li
14、cense from IHS-,-,-All procurement documents shall specify the extent of radiographic inspection, when it is required. This information shall include the number of areas and items to be radio- graphed, and the quality level of inspection to be applied (see paragraph 4.4). Radio- graphic location mar
15、kings shall be incor- porated on all applicable drawings, and shall be in accordance with MIL-STD-23. 4.2 Technique requirements for dog- rapb 4.2.1 Dbection of Tadiution. Unless other- wise specified, the direction of the central beam of radiation shall he perpendicular to the surface of the film.
16、4.2.2 Radtographic sensitivity. Radiog- raphy shall be performed with a technique which will distinguish the applicable pene- trameter. Sensitivity of radiographs shall be determined by using the penetrameters de- tailed in Figuro l. Unless otherwise specified by the bureau or agency concerned, the
17、2- 2T (2 percent equivalent sensitivity) hole lzce. Any source- film distance will be satisfactory provided that the required radiographic sensitivity and dinrpiiess is attained and distortion is not cxccssivc. 4.3 Penefranieters. The quality of all levels of radiographic testing shall be determined
18、 by a penetrameter. 4.3.1 Fab for level 4-2T the pene- trameter thickness shall be no greater than 1/25 (4 percent) of the thickness of explosive being examined, 4.3.1.3 The minimum penetrameter thick- ness shall be 0.005 inch despite the require- ments of 4.3.1.2. 4.3.1.4 The minimum hole size shal
19、l be 0.010 inch at the 1T location, 0.020 inch at the 2T location and 0.040 inch at the 4T lo- cation, despite the requirements of 4.3.1.2. 4.3.2 Ident.ification. The regular penetram- eter shall be identified with an integral num- ber made of lead which is attached to the penetrameter. This number
20、shall represent the penetrameter thickness in thousandths of an inch, as shown in Table I. 4.3.2.1 Lead numbers shall be placed ad- jacent to the circular penetrameters to pro- vide identification of the penetrameter on the film. 4.4 Quality levels of inspection. Three qual- ity levels of inspection
21、, levels 2-1TJ 2-2T and 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-STD-74bA ND W 7777733 00bLOb0 7 TABLE I Ezampbes of Penetrameter Identification MIGSm-746A TABLE III Special Quality Levels of Inspection Identitm- tion no. on penetrametc
22、20 60 160 280 400 Minimum specimen thicknw tor thick- Levels ZIT, Levels 1-1T Level Il 2-2T and and 1-2T 4-2T Penetrame ness I 2-4T I 1 I Inch o. 020 O. 060 0.160 O I 280 O. 400 Inches 1 3 8 14 20 inches 2 6 16 28 40 Inches 34 1% 4 7 10 MT, which are available through the design and application of t
23、he penetrameter, are shown in Table II and specified in 4.4 through 4.4.1.2. Other levels of inspection available are shown in Table III, and specified in 4.4.2 through 4.4.2.2. Care should be exercised in specifying the radiographic quality levels 2-19?, I-IT, and 1-2T, by first determining that th
24、ese quality levels are necessary and can be maintained in production. TABLE II Normal and the fact that the Government may have formulated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or otherwise as in any manner licensing
25、the holder or any other person or corporation, or conveying any rights or permission to manufadure, use or sell any patented invention that may in any way be related thereto. Copies of thiri standard for Military use may be obtained as indicated in the Department of Defense Index of Specifications a
26、nd Standards. Both the title and identifying symbol number should be dipdated when requesting copies of MiIi- tary Standards. Custodians: Preparing activity: Amy-MU Navy-Wep Nav y-Wep Air Force-OA posure Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
27、,-MIL-STD-74bA ND W 7777733 0063062 2 = 4T DIA MIN PENETRAMETER THICKNESS- MIN DIA FOR I T HOLE, MIN DIA FOR 2 T HOLE MIN PIA FOR 4 T HOLE HOLES SHALL BE TRUE AND NOSMAL TO THE SURFACE OF THE PENETRAMEXR DO NOT CHAMFER DESIGN FOR PENETRAMETER THICKNESS FROM .005“ TO AND INCLUDING ,050 NOTE: FROM r00
28、51 TO ,020“ MADE IN ,0025 INCREMENTS FROM .025“ TO ,050“ MADE IN .0051 INCREMENTS (-1 I43k- 4 $3 - DESIGN FOR PENETRAMETER THICKNESS FROM .0601 TO AND INCLUDING ,160“ NOTE: FROM ,060 TO ,160“ MADE.IN .010“ INCREMENTS 210% (Note i) DESIGN FOR PENETRAMETER THICKNESS OF .180“ AND OVER NOTE: MADE IN ,02
29、0 INCREMENTS Note i: Tolerances on penetrameter thickness and hole diameter shall be plus or minus IO percent or 1/2 of the thickness increment between penetromefer sizes, whichever is smaller. FIGURE 1. Penetminetem 7? US. GOVERNMENT PRINTING OFFICE: 1963-651073/B-94 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
