Journal of Pyrotechnics Archive http://www.jpyro.com/wp Dedicated to the advancement of pyrotechnics through the sharing of information Fri, 23 Jul 2010 07:43:28 +0000 http://wordpress.org/?v=2.9.1 en hourly 1 ShellCalc© V4.12 http://www.jpyro.com/wp/?p=1193 http://www.jpyro.com/wp/?p=1193#comments Fri, 23 Jul 2010 07:34:04 +0000 toms http://www.jpyro.com/wp/?p=1193 A new version of the Shellcalc© program is now available.  The original paper describing the program is available here.

Revision History

4.1.2 – July 2010

Allowed devices to be fired above ground level – for modelling firing from structures
Revised the initial velocities for shells to give more accurate modelling
Changed design and added larger graphics
Changed to Excel Macro-enabled format

3.2 – June 2005

Incorporated shell burst diameters
Incorporated optional allowance for shell barrelling/tumbling

3.1 – June 2003

Original version

Share on Facebook ]]> http://www.jpyro.com/wp/?feed=rss2&p=1193 1 UK Fireworks Surveillance for Compliance with ADR and the UN Default Classification of Fireworks http://www.jpyro.com/wp/?p=1186 http://www.jpyro.com/wp/?p=1186#comments Tue, 22 Jun 2010 18:15:42 +0000 toms http://www.jpyro.com/wp/?p=1186 D. Chapman, S. Dennis, B. Joyce, A. C. Donalds and M. J. C. Sime

Abstract: Fireworks compositions have been examined for a range of different fireworks. These compositions have been tested and measured to ascertain compliance (or otherwise) with the United Nations (UN) Default Fireworks Classification Table criteria for UN Hazard Division (HD) 1.4G classification.  Non-compliance with the requirements of UN HD 1.4G criteria have been found. These have constituted exceeding the total net explosive content (NEC), time–pressure rise times of less than 8 ms for non-black powder formulation burst charge compositions, metal based flash compositions being used as burst charge, and greater than 5% flash content in shot tubes. Fireworks that comply with the requirements of the UN default classification scheme have also been found.

Keywords: Compliance, default classification, UN, ADR

Ref: JPyro, Issue 29, 2010, pp40-46
(J29_40)
Share on Facebook ]]> http://www.jpyro.com/wp/?feed=rss2&p=1186 0 Defining Flash Compositions: Modifications to UN Time/Pressure Test http://www.jpyro.com/wp/?p=1176 http://www.jpyro.com/wp/?p=1176#comments Wed, 12 May 2010 06:54:24 +0000 toms http://www.jpyro.com/wp/?p=1176 D. Chapman and K. Howard

Abstract: The Time/Pressure Test from the UN Manual of Tests and Criteria has been modified to define flash compositions in the default classification lists for fireworks in the UN Model Regulations. This modified test is known as the HSL flash composition test. This paper summarises the history of this change from a composition-based to a performance-based definition and describes more recent work to improve the method when testing pyrotechnic compositions. A modified test method has been developed with a new firing plug that has been designed to improve reliability and reproducibility by changing the sample geometry and removing the primed cambric. The system has been manufactured and tested and was presented as a proposal to the UN Subcommittee of Experts on the Transport of Dangerous Goods as an additional test method for the Manual of Test and Criteria specifically for defining hazardous compositions with flash-like properties. The method and apparatus is now incorporated into the UN scheme for the classification of dangerous goods, specifically for fireworks.
Keywords: Flash Composition, UN Default List, Time/Pressure Test.
Ref: JPyro, Issue 29, 2010, pp32-39
(J29_32)
Share on Facebook ]]> http://www.jpyro.com/wp/?feed=rss2&p=1176 0 What is a “Safety Distance” for a Shell? http://www.jpyro.com/wp/?p=1164 http://www.jpyro.com/wp/?p=1164#comments Thu, 25 Mar 2010 10:46:34 +0000 toms http://www.jpyro.com/wp/?p=1164 Tom Smith

Abstract: This paper outlines the risk assessment methodologies and calculates the risks affecting the audience from the malfunctioning of shells.  Risks may arise from premature functioning of shells, from stars falling on the audience from low bursting shells, and from shells bursting in or near the audience.  Two mathematical approaches are taken using Shellcalc©derived data to determine the distances from the firing point of a shell that lead to an individual risk to a member of the audience.

Keywords: shells, risks, fallout, debris

Ref: JPyro, Issue 29, 2010, pp12-31
(J29_12)

Share on Facebook ]]> http://www.jpyro.com/wp/?feed=rss2&p=1164 1 Subscription Agencies http://www.jpyro.com/wp/?p=1160 http://www.jpyro.com/wp/?p=1160#comments Wed, 24 Feb 2010 09:09:49 +0000 Avril http://www.jpyro.com/wp/?p=1160 Subscription Agencies wishing to place an order for individuals or establishments are asked to contact us for any potential discount that may be available.  Please note that in general discounts are not available for single issue or single article subscriptions.

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Share on Facebook ]]> http://www.jpyro.com/wp/?feed=rss2&p=1160 0 JPyro – Issue 29, 2010 – Contents http://www.jpyro.com/wp/?p=1152 http://www.jpyro.com/wp/?p=1152#comments Thu, 18 Feb 2010 08:28:54 +0000 Avril http://www.jpyro.com/wp/?p=1152 Papers:

 

Ref: JPyro, Issue 29, 2010
(J29)

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