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Silencer exhaust gas boilers can be provided as steam raising boilers or hot water boilers or economisers. These boilers recover from 20% to 50% more heat at a higher working pressure than some other designs. They utilise the heat contained in the exhaust gases from diesel engines and gas turbines. Spanner boilers of this type have tubes expanded and then seal welded into the tube plate thus designed to be able to be run dry or with varying water levels giving varying steaming rates. In the dry condition access doors are opened to allow air circulation. They may be fitted with an integral by-pass with either manual or automatic control so that steam output can be controlled by varying the amount of gas passing over the heating surface. The boiler is designed to offer the minimum of resistance to gas flow with a back pressure less than 150mm water. There are therefore three ways of controlling steam pressure/generation rate: 1) via a gas by-pass valve; 2) via a steam dump system; 3) via changing water levels(thus changing generating surface). There is no capability for oil firing therefore a donkey package boiler is required for use in port. SWIRLYFLO tubes are used in this type of boiler design.

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SPANNER BOILER

Spanner exhaust gas boilers can be provided as steam raising boilers or hot water boilers or economisers. These boilers recover from 20% to 50% more heat at a higher working pressure than some other designs. They utilise the heat contained in the exhaust gases from diesel engines and gas turbines. Spanner boilers of this type have tubes expanded and then seal welded into the tube plate thus designed to be able to be run dry or with varying water levels giving varying steaming rates. In the dry condition access doors are opened to allow air circulation. They may be fitted with an integral by-pass with either manual or automatic control so that steam output can be controlled by varying the amount of gas passing over the heating surface. The boiler is designed to offer the minimum of resistance to gas flow with a back pressure less than 150mm water. There are therefore three ways of controlling steam pressure/generation rate: 1) via a gas by-pass valve; 2) via a steam dump system; 3) via changing water levels(thus changing generating surface). There is no capability for oil firing therefore a donkey package boiler is required for use in port. SWIRLYFLO tubes are used in this type of boiler design.
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