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The system shall be capable iso 16933 recording reliably the peak positive air-blast pressure and the complete pressure-time trace through the negative phase loading as well. Glazing dust and slivers are not accounted for in the hazard rating. C Minimal iso 16933 The glazing is observed to fracture. The free-air equivalent mass of a particular explosive is the mass of the standard explosive TNT required to produce a selected shock-wave parameter of magnitude equal to that produced by a unit mass of the explosive in iso 16933.
The blast values given are each derived from the mean values of several blast gauges distributed across a face area representing a test specimen of size iso 16933 m x 1,3 m; set with bottom edge at 0,5 m above ground within a concrete transducer wall representing a test frame iso 16933 size 2,4 m x 2,4 m.
If present, the location of perforations and indents shall be documented, with their height above the floor of the witness area recorded. However, different orientations, charge masses and test-frame sizes are permissible, provided that the test specimen experiences the required blast values normal to the specimen surface. Therefore this version remains current.
Each specimen shall be labelled in the post-test photographs to allow for their clear identification. Also, iso 16933 are no more than three rateable perforations or indents anywhere in the witness panel and any fragments on the floor between 1 m and 3 m from the interior face of the specimen have a sum total isso dimension iso 16933 mm or less.
To accommodate high-speed photography, a hole no greater than mm x mm may be made in the top or bottom iso 16933 of the witness panel within an area bounded by one third of the height and width ixo the panel. The test frame shall be provided with iso 16933 plates to hold each glazing in position and means for producing uniform clamping of the glazing. Where blast measurements have been taken from transducers around the edge of the test specimens, it can be necessary to derive the “mean peak pressure” determined for the centre by more complex computation.
Isl rating is specific iso 16933 to those blast conditions. For example, the positive phase iso 16933, 7 posmay be denoted I c where it denotes the classification impulse or 7 t where it denotes the impulse calculated from the measured test values.
Establish the value of the resulting measured peak pressure, P maxby recording the pressure value from the point at which kso mean pressure-time trace crosses the time-of-arrival axis.
The preliminary selection of an appropriate explosive and mass may be made 16933 iso 16933 to Table B. Life cycle A standard is reviewed every 5 years 00 Preliminary. Accept and continue Learn more about the cookies we use and how to change your settings.
Parts be projected iso 16933 distance from the attack face towards the blast source. The charges were positioned at the distances above the hard surfaces as defined above. Classification and ratings are assigned based on the performance of io loaded by air-blast iso 16933 and impulses, and are specific to the blast characteristics under which the test takes place.
A higher sampling rate is recommended for the satchel tests. Ethiopian Standards The Ethiopian Standards are developed by national technical committees which are composed of different stakeholders consisting of educational Institutions, research institutes, government organizations, certification, inspection, and testing organizations, regulatory bodies, consumer association etc. The free-field pressure transducer shall be located iso 16933 least 5 m or the width of the reaction structure, whichever is greater, from any reaction structure and at iso 16933 same horizontal distance from the high-explosive charge as the centre of the glazing.
P-t curves at locations subject to iso 16933 clearing, on small targets or near the edges of targets, have a reduced impulse and do not follow the shape of an idealized Friedlander curve. Iso 16933 information is given for the convenience of iso 16933 of ISO and does not constitute an endorsement by ISO of this product. If the reaction structure is oriented perpendicular to the line of the detonation point, the face of the reaction structure should not be less than 2,4 m wide x 2,4 m high.
Iso 16933 classification purposes, glazing shall be mounted in the frame defined in 6.
Approximate free-air equivalence factors, k pk x and k, for common military explosives are given in Table B. Photographs of the test specimens iso 16933 be taken before beginning removal of test specimens. The test facility iso 16933 be situated, and of sufficient size, to safely accommodate detonation iso 16933 the amount of explosive required to provide the desired peak positive air-blast pressure and positive phase impulse. Range test  EN 2Glass in building — Security glazing — Testing and classification of resistance against explosion pressure  Johnson, N.
Test and classification for iso 16933 air-blast loading. Mean peak air-blast pressure and mean positive-phase impulse values, computed from recordings by the air-blast ido mounted as defined in 6.
ISO – Estonian Centre for Standardisation
Glazing that has received an air-blast iso 16933 and rating is suitable for use ixo blast-resistant applications only for blasts of comparable characteristics and only iso 16933 installed in a properly designed frame.
The iso 16933 shall be located such that the pressure and impulse in the centre of each test specimen can be computed. For undated references, the latest edition of the referenced document including any amendments applies.