Presents the results of a further study concerning safety aspects of the effects of hydrogen sulphide concentrations in natural gas. This report is not, at the request of HSE, a comprehensive review of the sulphidation issue in GB, but presents the results of further work in the context of those from the initial study.
Hydrogen sulphide in gas in concentrations in excess of 0.4 mg m-3 reacts with copper carcassing or copper components within appliances in a sulphidation reaction resulting in formation of unstable deposits of copper sulphide. This scale subsequently detaches from the copper surface and can be transported into a gas appliance. Within gas fires the black dust deposit predominantly collects in the multi-port injectors and can lead to poor combustion. In combinations with inadequate fluing, these combustion products could spill into the room containing the appliance, with potentially hazardous consequences.
Some of these research reports are very large. For information about expected download times please see our FAQs pages.