By Chiellini E., et al.
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Additional info for Biorelated Polymers.. Sustainable Polymer Science and Technology
The term LD50 is widely recognized and means the oral dose required to kill 50 per cent of a target population, here of rats. 25 Subjective elements remain in this second system of classification. The question of frequency and duration of contamination may present difficulties in practice. g. an incident causing brief contamination which then clears Ð is inevitable. It remains to be seen, therefore, whether such a system offers worthwhile practical advantages in the long term. Fluid categories in the 1999 Regulations Risk in the 1999 Regulations is dealt with by recognizing five qualities of water as in the example (method 2) described above.
The piping systems resulting from this approach are generally simpler than those found in conventional systems in the UK but, as against this, the necessary devices for pressure relief and vacuum control offset some of the saving in cost that may be possible by omitting storage, whilst storage vessels for hot water may have to withstand higher pressures. With both hot and cold outlets commonly fed by supplies at similar (and considerable) pressures it has been possible to devise and market various compact mixing and blending taps for supplying the sanitary appliances.
Tests have also been specified for the capacity, strength, tightness and durability of the various backflow prevention devices (see BS 6280±6282). 5 for domestic and non-domestic situations. With WCs, the fluid in the pan is category 5 and measures have to correspond to that risk, both for cistern-fed and valve-fed pans, whether in domestic or non-domestic situations. Flushing valves for WCs and urinals, long used abroad, are increasingly applied in the UK for nondomestic situations. The Regulations distinguish between valves served by a dedicated cistern (with type AG airgap) and those served from a pipe system.