... competent persons, 812–13definition, 795examinations, 765 for experimental purposes, 762 fired and heated vessels, 762 pipeline examination, 795 6 piping, 762 Pressure Equipment Directive, 760 record ... 63 2–3humidity, 63 5lighting, 63 5–7space, 63 3temperature, 63 3–4ventilation, 63 7–8Index 1 061 system operational phase, 239systems diagrams, 240–1systems theory and design,240–2see also Safety legislation; ... discharge, 971–2spillage procedures, 934, 935trade effluent, 934–8treatment works, 9 36 water abstraction offences, 952Water Industries Act, 970water pollution offences, 952Water Resources Act,...