UN/SCETDG/16/INF10

COMMITTEE OF EXPERTS ON THE

TRANSPORT OF DANGEROUS GOODS

Sub-Committee of Experts on the

Transport of Dangerous Goods

(Sixteenth session, Geneva, July 5-16, l999,

agenda item 5 (e))

MISCELLANEOUS DRAFT AMENDMENTS TO THE MODEL REGULATIONS

ON THE TRANSPORT OF DANGEROUS GOODS

Proposal for amendments to T Code assignments based on decisions by IMO

Transmitted by the Expert from the United States of America

1.	During the Dangerous Goods, Solid Cargoes and Containers (DSC-4) Sub-Committee and its Editorial and Technical Group (E&T) meeting, decisions were made which impact the assignment of T-Codes and special tank provisions (TP notes) in the Dangerous Goods List and Part 4 of the Model Regulations. The expert from the United States proposes to take these decisions into account in the Model Regulations to ensure consistency in international transport relative to portable tanks.

2.	The following is a description of the decisions taken by IMO:

(a)	A new tank assignment was adopted for n-propyl chloroformate, UN 2740, PG I . The T-Code and tank provisions adopted were: T20, TP2, TP13. The tank assignment is consistent with those of other chloroformates which are authorized for transport in tanks such as methyl chloroformate and ethyl chloroformate.

(b)	A new tank assignment was adopted for Arsenic compound liquid, n.o.s. , UN1556 PG I, II and III. The tank assignments are consistent with those for other toxic liquids such as UN 2994, Arsenical pesticide, liquid toxic and with the rationalized approach for tank assignments. The T Code and tank provisions adopted were:

PG I - T14, TP2, TP9, TP13, TP27

PGII - T11, TP2, TP13, TP27

PG III - T7, TP2, TP28

(c)	IMO agreed to harmonize the TP notes which will be included in Amendment 30 with those in the eleventh revised edition of the UN Model Regulation. However, IMO adopted two new special tank provisions (i.e. TP30 and TP31). TP 30 was adopted consistent with IMO special tank requirement (h); "Transported in insulated tanks". This new TP note applies to UN 2531, Methacrylic acid, inhibited and 2579, Piperazine. TP 31 was adopted consistent with IMO special tank requirement (m); "May only be carried in the solid state." This new TP note applies to UN 1381, Phosphorous white or yellow, 1422, Potassium sodium alloys, 1428, Sodium and 2257 Potassium.

Action Requested:

3.	The Sub-Committee is requested to consider the actions taken by IMO and to update the Dangerous Goods List and Part 4 to the Model Regulation accordingly.

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