Book - School of Science and Technology

292 Boilers and firing equipmentSafety shut-off valvesPilot gas linePressure test pointsPressure switchesBoosterMain gas lineBurnerMeterPilot governorBy-passBy-passBurnerMain governorFigure 10.26 Pipework arrangements for gas booster. Boiler dampers should be either removed, locked open with an indicating plate showingthe position of the vane, or provided with an interlock with the burner control.. Both boiler house and fuel tank room should be provided either with piped foamconnections for use by the fire brigade or with chemical fire extinguishers of appropriatetype.. Plant operators should be certificated as competent to undertake the tasks expected ofthem.Miscellaneous burner equipmentSuccessive energy crises have led to interest in the consumption of a wide variety of wasteproducts for heat production and to the development of specialist boilers and burnerssuitable for their disposal. This subject covers too wide a field to be dealt with here withall the attendant ramifications of incomplete incineration, furnace fouling by non-degradablematerial and atmospheric pollution by exhaust gases. Two items, from opposite endsof the technological spectrum, may be noted as being of interest.Straw boilersFor disposal of a rural waste product, straw in bales, a number of purpose-made boilershave appeared on the market, together with a variety of ancillary equipment (Figure10.27). Bales are produced in two sizes, the small rectangular size which measures