Bulk Distributor Sept/Oct 16 - Page 21

Letters September/October 2016 BULKDISTRIBUTOR 21 Dangerous Polymerisers – Flow Capacity through the Pressure Relief System on Tanks Astute and conscientious readers of your columns will be aware that four new UN numbers will be added to the Dangerous Goods List of the modal regulations from 2017. These are: UN 3531 POLYMERIZING SUBSTANCE, SOLID, STABILIZED, N.O.S. UN 3532 POLYMERIZING SUBSTANCE, LIQUID, STABILIZED, N.O.S. UN 3533 POLYMERIZING SUBSTANCE, SOLID, TEMPERATURE CONTROLLED, N.O.S. UN 3534 POLYMERIZING SUBSTANCE, LIQUID, TEMPERATURE CONTROLLED, N.O.S. Let me say straight away that I fully support the decision to provide classification criteria for the inclusion of such substances in the regulations. As I write they will be allocated to Class 4.1 though there is still a query going on as to whether this is the right class for them – some would support inclusion in Class 9 instead. At the same time we are going to be faced with the situation where these substances which heretofore could be transported as nondangerous suddenly become dangerous goods. I hasten to add that I do not have any idea (nor I guess do others including competent authorities) how many substances will be caught up in these changes though one assumes that divinyl benzene will be one. Come what may, readers interested in these developments may like to note that for transport in Portable Tanks, the T-code T7 has been allocated to them. For operators of Portable Tanks in the form of the ISO tank container, this is not too much of a problem in itself, I suggest. However where difficulties could potentially occur surround the decision of the UN Subcommittee of Experts to assign Portable Tank Special Provision TP6 to these four entries. TP6 states: “(+)” to their chosen tank codes as a form of equivalency to TP6. Hmmm. This term effectively either means that you have to use tanks dedicated to the transport of just one substance or at best a few similar substances – see 4.3.4.1.3 of RID and ADR. I ask whether this is a regulation too far for these substances – to go from non-regulated up to 31.06.2017 when the normal transitiona W&BVG2F&Vr&VwVFVBF2vFBFB66FW&Fv2vfVVFW"'FRT7V&6֗GFVR"FR$BE"DBVWFrFWFVFrFP&G&6FW&G2'FRvࠤfRW"6ࠤRv&R66W&VB&WBFW6R77VW2VvBF6F7@FV"F6WFVBWF&FW2262FW6ॖW'266W&Vǒ&&V&667VF@6F7BFR'VƲF7G&'WF"FVЧvFW"2BfWw07D'VƲF7G&'WF"6РbbrdT$U"#b%U$rU54R%U$p#`FV"6"FRVFrWfVBf"FPvW&F7F&vRGW7G'( F&WfVBFRF'W'7FrWfVB6VFrf&PVwVfVBBFR'F&RF6&R&fFVBvF&W77W&W&VƖVbFWf6W2v6&RFWVFR&VFFFR66GbFPFBFFRGW&RbFR7V'7F6RG&7'FVBFRFWf6P66&R6F&RvFFR7V'7F6R( ХF2'VRv&WV&RVffV7FfVǒFRFWFW&֖FbFRVFGbfW'2v66VB&R&GV6VB6RǖW&6F&V7F7F'G2FV7W&RFR&W77W&R&VƖVbFWf6W2fR7Vff6VBfp66GFrFVFW66RBF&WfVB'W'7Fr66v'2BW&F'2bF2&wV&ǒ6VB7F'B&vBpFWFW&֖rvBfr66G2VVFVB6VBǖW&6F7F'BBbFRF27W'&VFǒ6W'f6R&RB&fFVBvF7Vff6VBfr66GFW&FfRF27V'7FGWFVB"FRW7FpF2FfVBVFW"vFRv&RVVFVBF6W&6P&W6VVBF26VBFB&RV6W76'"FFgW7FpF2rRB&Vr&֗7BBFBRrBv&RfV@FBFRfr66GW7Fr'F&RF227Vff6VBFVWBFR&WV&VVG2bEbvWfW"WFVFVBG&6F'&vVVG2fR&VV&fFVBFVWBEbWG&V֗26V@vRFBBV7BGvV'2&RVVFVBRFRfp&FR67VF2"V7W&RFW&R27Vff6VBVBFR6F6W&6P7VF&R&W77W&R&VƖVbFWf6W2BFV2VFW"FFVfBFPFWf6W2FWvǒ67G'V7FVBF2"'W&W2W7FrF0vW&RFRFFFB"&vW"FWf6W26&RfGFVB&VBF2&RVVBf"vW"W&F'2FfBFRf6RFgV@FR6fW'62"'VBWr'F&RF22B7FG2BF2VB"FW&B2FB2vV@F6WfRF2f"Rv6rFG&7'BFW6RWpFvW&W2vG2'6VDr6FRRVVFrFW6R&&B"BvFW'v2G&7'BWW&R$BE"DvǒvWB6F2FRFR6vW2FW&R2gW'FW"6Ɩ6FF2WW&RvRfPFW"6WBb&f62f"FRG&7'BbFvW&W2vG2F2fVB6FW'2B2BbbFR$BBE"&W76RFFRFV662FV'FRT7V&6֗GFVRbWW'G2FR$BE"DBVWFrBF6FRWW&VF氦6FRf"FRG&7'BbFW6RFW&2FW&R2F&V7@WVfVB6FW"B2"6FW"bFFREb76vVBFT'F&RF26FV"WW'G26RWFV6FVBFFBFRFW&Р$Tt5DU"DEDTBDDVWBvF7WƖW'26W&6RFPFW7B&GV7G2BVWWFFFPvFGW7G'G&VG2wwrF7F&vVvW&6Рff6'B7W'FW 6r7W'FW'0*ࠥ6W'frFRF7F&vR6VGv&ǐUUU$P#3$4#r$EDU$DРԔDDRT5Be$4#bb#r$#rET$t$BE$DR4TE$RTP&Vv7FW"rvrwwrF7F&vVvW&6ХE4ub6W4GfW'Cs#c2FB4dT$U"#r4tt$BU4&v6VB'#bs