## 5 Conclusions
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Boller Components** & **Failure Mode** & **Failure Cause** & **Failure Effect** \\ \hline \multirow{4}{*}{Strainer} & Strainer clogging & Due to dust anddirt and & \\  & Strainer clogging & improper cleaning & Water flow problem \\ \cline{2-3}  & Channeling & High differential pressures flow & Circulation of unfiltered \\ \cline{2-3}  & Fatigue cracks & Cyclic flow & Fluid \\ \cline{2-3}  & Media migration & Vibration or cyclic flow & Release of filter media \\ \hline \multirow{4}{*}{Feed Water tank} & \multirow{4}{*}{Oxygen pitting} & Poor mechanical derator performance & \\  & & Downtime corrosion & Equipment failure \\ \cline{2-3}  & & Poor boiler feed water quality & \\ \cline{2-3}  & Deposition & Inadequate blowdown control & Equipment failure \\ \cline{2-3}  & Improper water supply & Workers unawareness & Boiler system failure \\ \cline{2-3}  & Rust/corrosion & Dust or impurities enters & Tank failure \\ \cline{2-3}  & Leak & Corrosion & Lost water and quality of water \\ \hline \multirow{2}{*}{Water level controller} & Fails to operate & Due to corrosion & Boiler failure and hazardous to \\ \cline{2-3}  & Fails to provide signal & Electrical failure & operator \\ \hline \multirow{4}{*}{Feed water hose} & Hose Block & Impurities present in water & Insufficient water supply to boiler \\ \cline{2-3}  & Hose leakage & The shell of the fitting was crimped & \\  & too much or too little during assembly & \\ \cline{2-3}  & The fitting has blown off the hose & The hose was not inserted & \\  & & deeply enough & Hazardous to operators \\ \cline{2-3}  & Hose is hard and brittle & The hose was exposed to heat & \\  & & exceeding the maximum & \\  & & recommended temperature & \\ \hline \multirow{4}{*}{Water Sofner} & Fail to operate & Water contamination & Scaling anddamage of boiler tubes \\ \cline{2-3}  & No softening & & Reduction in boiler efficiency \\ \cline{2-3}  & Excess scaling & & \\  & Too much softening & & \\ \hline \multirow{4}{*}{Deaerator} & Deaerator spray zone corrosion on & Due to high chlorides & \\  & SS shell & & \\ \cline{2-3}  & Deaerator inlet header spray & Due to high pressure and temp & \\  & pipe failure & & \\ \cline{2-3}  & Excessive derator venting & Deaerator steam supply PRV & Steam pressure low/wasteg of steam \\ \cline{2-3}  & Deaerator spray valve spring failure & Due to excess pressure & Derator failure \\ \hline \multirow{4}{*}{ReturnWater Temperature Sensor} & \multirow{4}{*}{Incorrect signal from sensor element} & Reduced signal level & \\  & & Impedance mismatch & Potential processing error \\ \cline{2-3}  & & A/D conversion error & \\ \cline{2-3}  & Loss of signal from sensor element & Chip failure & \\ \cline{2-3}  & & Corroded sensor & Loss of signal to processor \\ \cline{2-3}  & Power supply loss of voltage & power supply malfunction & Loss of signal to processor \\ \cline{2-3}  & Calibration error & Software error & \\ \hline \multirow{4}{*}{Drain pump} & Drain hose leakage & Due to corrosion, dust and dirt & System failure \\ \cline{2-3}  & Drain hose blockage & Dirt andcorrosion & \\ \cline{2-3}  & Pump gear wear & Material defect & Pump failure \\ \cline{2-3}  & Strainer is clogged & Improper cleaning & Pump failure \\ \hline \multirow{4}{*}{Condensate filter} & Internal leakage & Due to aging & Equipment failure \\ \cline{2-3}  & Clogging & Due to impurities and & \\ \cline{2-3}  & & operators unawareness & System failure \\ \hline \multirow{4}{*}{Induced Draft (ID) Fan} & Motor or contactor failure & Dust anddirt particles & Loss of control of parameters-temp. \\ \cline{2-3}  & Fan failure/fails to start & Electrical or mechanical failure & System level effect \\ \cline{2-3}  & Failure due to jamming of blades & Due to foreign material and dust & Equipment Failure \\ \cline{2-3}  & De-function or pressure drop & Due to aging & \\ \hline \end{tabular}
\end{table} 
Table 1: Cont.