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 5 (b) of the provisional agenda

Miscellaneous proposals of amendments to the Model Regulations
on the transport of Dangerous Goods: portable tanks

               Proposal to amend Chapter 6.7 of the Model Regulations

                   Transmitted by the expert from Spain[1]

               Proposal

1.         The expert from Spainproposes to add a new paragraph to Chapter 6.7, section 6.7.2.2, as follows:

“6.7.2.2.18: The shell of a portable tank can be equipped internally with surge plates, with the intention to increase its strength and to limit the dynamic effects of the liquids transported.

These surge-plates shall be designed taking account of the following requirements:

(a)    Surge plates shall be constructed with the same steel as the shell and their thickness shall in no case be less than the thickness of the cylindrical portion of the shell.

Surge plates shall be dished with a depth of dish of not less than 10 cm, or shall be corrugated, profiled or otherwise reinforced to give equivalent strength. The area of the surge plate shall be at least 70% of the cross-sectional area of the tank in which the surge plate is fitted.

(b)    They would have different openings with the object of allowing the following effects:

The transfer of vapour in the interior upper part of the shell, the passage of a man from one side of the surge plate to the other one if necessary, the control of the movement of the liquid mass during the transport in the interior of the shell and its unloading when it is required.”.

               Justification

2.         In reality these “surge plates”, that are proposed, are a normal practice in the design of the tank container construction and are mentioned in inland transport regulations such as the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) and the Regulations concerning the International Transport of Dangerous Goods by Rail (RID).

3.         Normally the “surge plates” are considered essentially as strengthening members, in the same way as other members, for example: the partitions and the external or internal rings of the shell.

4.         In the ADR the “surge plates” are also used as valid elements to reduce the thickness of the shell, if they meet some conditions. (For example, when the volume contained between two surge plates is not more than 7500 l).

5.         The expert from Spainconsiders it necessary to incorporate these elements into the Model Regulations because they are already used by portable tank manufacturers worldwide in many cases.

联合国危险货物运输专家和全球化学品统一分类和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5 (b)项

对规章范本的各种修订草案：便携式罐体

               关于修订规章范本6.7章的提议

                   由西班牙专家提交[2]

               提议

1.         西班牙专家提议在6.7章的6.7.2.2部分新加入一段内容，如下所示：

 “6.7.2.2.18：便携式罐体的罐壳可以在内部装备防波板以增加其强度并限制运输液体的动力学效应。

设计防波板时应考虑以下要求：

(a)    制造防波板应使用与罐壳相同的钢材，并且防波板的厚度在任何情况下都不应小于罐壳圆柱体部分的厚度。

防波板应挖出一个深度不小于10 cm的圆盘，亦可做出波纹、铣出剖面或以其他方式加强，使之具有同等的强度。防波板的面积至少应为防波板安装处横截面面积的70％。

 (b)      它们应具有不同的开口，以期能够应对如下情况：

罐壳内部上层部分蒸气的传导；如有必要，应满足能使一个人从防波板一端经过到达另一端；在运输过程中对罐壳内部液体质量移动的控制以及需要时的液体卸载。”

               理由

2.      实际上，这些提议采用的“防波板” 是罐体容器制造设计过程中的通常惯例，在《国际公路运输危险货物欧洲协议》(ADR) 以及《国际铁路运输危险货物规则》 (RID)中均有描述。

3.         通常情况下，与其他的此类部件一样（例如：例如：分隔板和罐壳外部或内部的加强环），“防波板”被认为是必须的加固部件。

4.         在ADR中，在满足一定条件的情况下（例如：当两个调压盘之间的容积不超过7500 L的情况下），“防波板”也被用作减少罐壳厚度的有效元件。