Committee of Experts on the Transport of Dangerous Goods and on the Globally Harmonized System of Classification and Labelling of Chemicals

Sub-Committee of Experts on the Transport of Dangerous Goods

Forty-first session

Geneva, 25 June – 4 July 2012
Item 2 (a) of the provisional agenda

Explosives and related matters: test series 6

Manual of Tests and Criteria

Recommendations for clarification related to the Test Series 6(c) Bonfire Test

Transmitted by the expert from the United States of America

Introduction

1.  Section 16.6.1.4.4 of Manual of Tests and Criteria 5^th Revised Edition (ST/SG/AC.10/11/Rev.5 – referred to subsequently as MTC5) addresses criteria for inclusion of products in Division 1.3. Based on experience in evaluating the results of test results, it is believed that minor clarifying amendments are in order to: (1) clarify the requirement for recording equipment, and (2) clarify the test criteria for evaluation of fireballs/jet flames.

2.  The apparatus and materials list for the Test 6 (c): External fire (bonfire) test, Section 16.6.1.2(h) indicates that cameras are required to record events.  However, subsequent sections outlining the procedure and test criteria do not specify any details with respect to the orientation of cameras required to record the test.  Previous requests for test videos have resulted in delivery of a single video showing one angle, typically set up to show the fire grate with witness screens on the left and right and rear of the grate.  Evaluation of effects from the test toward the rear witness screen or toward the camera has been problematic.  It is therefore proposed that text be added to 16.6.1.3.5 to ensure that videos comprehensively capture test results in a manner that can be adequately reviewed.

3.  In addition, there appears to be some confusion regarding the test evaluation criteria for Division 1.3 in the bonfire test, found in Section 16.6.1.4.4(a), related to the effect of fireballs or jets of flame which exceed 4 meters from the grate (vertical direction) but do not directly pass the witness screens.  The MTC 2^nd revised edition (MTC2) contained additional criteria whereby “a jet of flame which extends more than 3 meters from the flames of the fire” would keep a product in HC/D 1.3 (Section 16.6.1.4.4(b), MTC2).  This criteria was not included in the MTC 3^rd revised edition or subsequent editions.  We have received test reports which indicate a test has met all the criteria for a 1.4 or 1.4S classification, but upon receipt of the video results we have observed jetting which appears to be up to 8 meters from the grate in a vertical direction but does not pass any of the witness screens.  These results are said to have passed the criteria in 16.6.1.4.4(a).  The expert from the United States of Americabelieves however that the intent of test evaluation criteria for Division 1.3 in the bonfire test, found in Section 16.6.1.4.4(a), is to measure the effect of fireballs or jets of flame which exceed 4 meters in any direction from the edge of the package.  The proposed clarifying amendment to 16.6.1.4.4(a) ensures that downwind and upward projections where witness screens are not present are accounted for and captured by the required video cameras.

Proposals

Section 16

5.  Amend 16.6.1.3.5 to add at the end:

Video cameras should be set up so as to observe effects toward all witness screens          and in all directions from the grate.

6.  Amend 16.6.1.4.4(a) of the 6(c) test procedure to read:

(a) a fireball or jet of flame which extends more than 4 m in any direction from the edge of the packages or unpackaged articles.

联合国危险货物运输与全球化学品统一分类及标签制度专家委员会

危险货物运输专家分委员会

第四十一次会议

日内瓦, 2012年6月25日-7月4日

议程第 2 (a)项

爆炸物和相关内容: 试验系列 6

试验和标准手册

与试验系列6(c)篝火试验有关的澄清建议

由美国专家提交

介绍

1.  第5修订版试验标准手册16.6.1.4.4节(ST/SG/AC.10/11/Rev.5 – 以下简称为 MTC5)给出了将产品划入1.3项的标准。基于对试验结果评估的经验，应该对其做一些小的修订，目的是：(1)说明对记录设备的要求，和(2)明确怎样评估火球/火舌的试验标准。

2.  为试验系列6(c)列出的设备和材料：外部火烧（篝火）试验，16.6.1.2(h)节指出需要摄影机来记录事态发展。然而，接下来的程序和试验标准部分没有任何关于摄影机记录试验所要求的角度的详细说明。之前对试验录像的要求导致提交的是只显示一个角度的录像，而通常设置是有验证屏的格栅的左方和右方以及格栅的后方。对于朝向验证屏后方或朝向摄影机的两个试验结果的评估是有问题的。因此建议在16.6.1.3.5增加文字来确保录像要全面的记录实验结果从而可以充分对其进行评估。

3.  此外，似乎关于篝火试验的1.3项试验评估标准：“在16.6.1.4.4(a)中，关于火球或火舌超过格栅（垂直方向）4米但是没直接通过验证屏的结果”这一点会有一些混淆。在第2修订版试验标准手册（MTC2）中有附加的标准：根据“火舌延伸出火焰超过3米”将保持产品在HC/D 1.3中(16.6.1.4.4(b), MTC2)。该标准未包括在第3修订版和之后版本的试验标准手册中。我们曾接收过试验报告表明该试验符合所有1.4或1.4S分类的标准，但收到试验录像后我们观察到喷射的火焰似乎从垂直方向的格栅处达到了8米，但没有通过任何验证屏。这些结果表示其通过了16.6.1.4.4(a)的标准。美国专家相信16.6.1.4.4(a)的篝火试验中1.3项的试验评估标准的意图是用来测量火球或超过包装边缘任何方向4米的火舌的效果。本提案澄清了对16.6.1.4.4(a)的修订从而确保没有验证屏的下风和上风方向的喷射也要考虑并且应在要求的试验录像中体现。

提议

16节

5.  修订16.6.1.3.5，在最后增加如下内容：

录影机的设置应可以观察到朝向所有验证屏和格栅外的所有方向的效果。

6.  修订6(c)试验程序的16.6.1.4.4(a)如下:

(a) 一个火球或火舌延伸至包装边缘或未包装的物品外任何方向超过4米。