Appendix A: Report on risk assessment of chimney ... - Planning Portal

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2 Summary2.1 The available data was not adequate to undertake a full risk assessment. We havetried to pull together all the various comments made by industry experts and estimatesgiven to make up for lack of hard data. As a result only very broad conclusions shouldbe regarded as credible.2.2 Taking account of: the relative incident rates for lined and unlined flues the comments regarding age (section 4.6) the increasing number of closed appliancesthe conclusion must be that the number of deaths from CO is likely to increase overtime rather than reduce unless changes are made.2.3 In order to justify specific action on liners with high sand content already in use thetechnical experts would need to assess the risk relative to other concrete liners to besignificant. Assuming that the majority of these particular liners being used withclosed appliances do in fact crack the expected number of deaths is one per annum.This is roughly equivalent to assuming a risk for these liners ten times that of otherlined (non-prefabricated) flues.A2
3 Approach3.1 The majority of deaths and injury arising from CO poisoning involve ’closed’ solid fuelappliances. Although it is difficult to establish the use of open fires (many used onlyoccasionally) the other experts involved were of the opinion that closed appliancesrepresented the major risk. This report therefore concentrates on closed appliancesas open fires are unlikely to generate significant extra risk if closed appliances do notdo so.3.2 The approach has two steps: firstly to analyse the available data to establish the risk associated with differenttypes of liners (including unlined) secondly to take account of the CRE tests and opinions of technical expertsregarding the relative performance of concrete liners with a high sand content.3.3 Apart from the inadequacies of the data referred to in the next section, meaningfulanalysis is difficult since: as far as we are aware no deaths have occurred involving the liners with highsand content to date. Given the small number of such liners installed this is notsignificant but means no direct statistical comparison with other liners is possible deaths may occur from causes (eg poor installation, poor maintenance, appliancemisuse) totally unrelated to the type of liner in use a liner may be defective or cracked but not give rise to a life threatening situationunless another cause (unswept, blockage) is present.A3
Page 1 and 2: Appendix A
Page 6 and 7: 4 Data4.1 All the available data re
Page 9 and 10: 5 Results5.1 We have 730,000 closed
Page 11: Trends5.12 Based on SFA figures, th

Appendix A: Report on risk assessment of chimney ... - Planning Portal

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