@article{10.11648/j.ajmie.20170202.13,
  author = {Christian Emeka Okafor and Augustine Alexander Atikpakpa and Ugochukwu Chuka Okonkwo and Ekerikevwe Kennedy Irikefe},
  title = {Maintainability Evaluation of Steam and Gas Turbine Components in a Thermal Power Station},
  journal = {American Journal of Mechanical and Industrial Engineering},
  volume = {2},
  number = {2},
  pages = {72-80},
  doi = {10.11648/j.ajmie.20170202.13},
  url = {https://doi.org/10.11648/j.ajmie.20170202.13},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajmie.20170202.13},
  abstract = {Maintenance costs have risen steadily over recent years in proportion to total investment in thermal power stations, however lack of regular maintenance can result in serious equipment failure with catastrophic consequences. In general, the Nigerian power generation capability has nosedived to an abysmal level, particularly at the generation stations due to poor maintenance culture. This paper evaluated maintainability of steam and gas turbines components in a thermal power station. Data were obtained from a thermal power station in Nigeria; these raw data were extracted from the operation department, which represents records of plant generation capabilities as well as other inherent daily conditions that will enhance the success of this study. Various maintainability measures were used in analyzing the data, the study implemented log normal distribution considering that most turbines fails due to fatigue and other phenomenon that are caused by ageing or wear resulting in failure rates that increase with time. The estimated mean time to failure of turbine 2 reduced from 35744.5 hours to 33643.8 hours after the use of a condition based preventive maintenance policy. Mean Preventive Maintenance Time (MPMT) for Economizer Inlet non Return Valve and its effect on steam turbine 1 ranges from 77144hrs to 4296hrs for gas turbine 2. The station overall mean maintenance time showed that steam turbine 1 has a maximum hours (77144hrs), while its is minimum for gas turbine2 (4296 hrs). MPMT of sub-equipment is maximum up to 48717 hrs on Gear defect/Hood diaphragm for steam turbine 2; also maximum for the Economizer Inlet non Return Valve, while this was minimum about 48708 hrs for the water pump. For gas turbine 2 MPMT hours for seal leakages and air filters have a maximum value of about 4295.5 hrs, while it is very low on other equipment. The equipment maximum corrective maintenance time (MCMT) of various turbines is higher for steam turbine 2 (10.04 hrs), while minimum for gas turbine 2 (10.00 hrs). Conclusively, planned maintenance tasks can reduce the number of unplanned or emergency trips of these turbines.},
 year = {2017}
}

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TY  - JOUR
T1  - Maintainability Evaluation of Steam and Gas Turbine Components in a Thermal Power Station
AU  - Christian Emeka Okafor
AU  - Augustine Alexander Atikpakpa
AU  - Ugochukwu Chuka Okonkwo
AU  - Ekerikevwe Kennedy Irikefe
Y1  - 2017/01/20
PY  - 2017
N1  - https://doi.org/10.11648/j.ajmie.20170202.13
DO  - 10.11648/j.ajmie.20170202.13
T2  - American Journal of Mechanical and Industrial Engineering
JF  - American Journal of Mechanical and Industrial Engineering
JO  - American Journal of Mechanical and Industrial Engineering
SP  - 72
EP  - 80
PB  - Science Publishing Group
SN  - 2575-6060
UR  - https://doi.org/10.11648/j.ajmie.20170202.13
AB  - Maintenance costs have risen steadily over recent years in proportion to total investment in thermal power stations, however lack of regular maintenance can result in serious equipment failure with catastrophic consequences. In general, the Nigerian power generation capability has nosedived to an abysmal level, particularly at the generation stations due to poor maintenance culture. This paper evaluated maintainability of steam and gas turbines components in a thermal power station. Data were obtained from a thermal power station in Nigeria; these raw data were extracted from the operation department, which represents records of plant generation capabilities as well as other inherent daily conditions that will enhance the success of this study. Various maintainability measures were used in analyzing the data, the study implemented log normal distribution considering that most turbines fails due to fatigue and other phenomenon that are caused by ageing or wear resulting in failure rates that increase with time. The estimated mean time to failure of turbine 2 reduced from 35744.5 hours to 33643.8 hours after the use of a condition based preventive maintenance policy. Mean Preventive Maintenance Time (MPMT) for Economizer Inlet non Return Valve and its effect on steam turbine 1 ranges from 77144hrs to 4296hrs for gas turbine 2. The station overall mean maintenance time showed that steam turbine 1 has a maximum hours (77144hrs), while its is minimum for gas turbine2 (4296 hrs). MPMT of sub-equipment is maximum up to 48717 hrs on Gear defect/Hood diaphragm for steam turbine 2; also maximum for the Economizer Inlet non Return Valve, while this was minimum about 48708 hrs for the water pump. For gas turbine 2 MPMT hours for seal leakages and air filters have a maximum value of about 4295.5 hrs, while it is very low on other equipment. The equipment maximum corrective maintenance time (MCMT) of various turbines is higher for steam turbine 2 (10.04 hrs), while minimum for gas turbine 2 (10.00 hrs). Conclusively, planned maintenance tasks can reduce the number of unplanned or emergency trips of these turbines.
VL  - 2
IS  - 2
ER  - 

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