1 Jul ISO (E). PDF disclaimer. This PDF file may contain embedded typefaces. In accordance with Adobe’s licensing policy, this file may. 21 Jun Purchase your copy of ISO as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available. In ISO and ISO more sophisticated hazard criteria were adopted. Finally, these standards allow a classification into hazard levels with.
|Published (Last):||10 August 2013|
|PDF File Size:||1.73 Mb|
|ePub File Size:||6.66 Mb|
|Price:||Free* [*Free Regsitration Required]|
Shock tube  ENWindows, doors and shutters — Explosion resistance — Requirements and classification — Part 2: A number shall be assigned to each test specimen and shall be marked accordingly. Two new ISO standards on security glazing will help protect people against terrorist attacks.
Check out our FAQs. A positive phase iiso, t pos negative phase jso The witness panel shall have a width at least that of the minimum permitted reaction structure defined in 6. The 3 kg charges were placed at a height of 0,5 m to centre above a hard surface. Establish the value of the resulting measured peak pressure, P max169333 recording the pressure value from the point at which the mean pressure-time trace crosses the time-of-arrival axis.
Nominal charge size and nominal standoff distances capable of giving the required peak pressure and impulse values under certain conditions and when in the reflected orientation are included in Clause C.
The first is intended for use with glazing designed to protect against vehicle bombs and is based on kg TNT trinitrotoluene equivalent blasts.
The apparent condition of the test specimens shall be recorded. Potential environmental impact issues shall be analyzed and resolved isk to testing. Seven standard blasts simulating vehicle bombs and seven standard blasts simulating smaller satchel bombs that can be used to classify glazing performance are incorporated in this International Standard and cover a broad range of blast parameters.
Fragments that shall be considered in rating the glazing or glazing system include those generated by the glazing and any other parts of the glazing system not considered to be part of the test facility. The value derived from several of these individual, adjusted peak pressures for comparison with the classification criteria is referred to as the “mean peak air-blast pressure”, as in Clause 8 and Tables 2 and 3.
The test values applicable to the centre of the test specimen for comparison with the classification criteria are to be computed from at least three gauges distributed around the face of the target area or within the simulated area if a separate transducer panel is used see 6.
ESA has the copyright of all its publications. For further information, see Annexes A and B. At least one free-field pressure transducer shall be used in each test.
The blast wave is characterized at any given point by an instantaneous rise in pressure followed by a decay over a time period called the positive phase duration. Where blast measurements have been taken from transducers around the edge of the test specimens, iao can be necessary to derive the “mean peak pressure” determined for the centre by more complex computation. Optionally, appropriate pressure transducers may also be located within the enclosure behind the glazing to measure the pressure within the protected area during the blast.
Take the smart route to manage medical device compliance. A higher sampling rate is recommended for the satchel tests. Match the measured and recorded pressure-time trace, P tfor the positive phase to the best fit, smoothed mean curve through the measured points to derive the values of P max and t ir This may be done by numerical methods or a combination of numerical methods and curve smoothing by eye.
The fragment severity is determined based upon the number, size, effects and location of fragments that lie at, or behind, the original location observed during post-test data gathering.
This is in order to isso excessive reductions in reflected impulse that arise owing to the effects of blast clearing from the edges of small targets. This website is best viewed with browser version of up to Microsoft Internet Ios 8 or Firefox 3. Also, there 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 united dimension of mm or less.
It is the responsibility of the test director to set up the test in order to impose the required blast values on the surface of the test specimen within the tolerances as determined by the following steps on valid measurements.
Approximate free-air equivalence factors, k pk x and k, for common military explosives are given in Table B.
After the high explosive is armed and all personnel are at a safe distance from the explosive, the explosion shall be triggered. Ethiopian Standards are approved by the National Standardization Council and are kept under continuous review after publication and updated regularly to take account of latest scientific and technological changes.
Search all products by. Non-standard test specimens may be mounted at heights appropriate to the manner in which they will be mounted in the field. Monday to Friday –