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LUND UNIVERSITY LIBRARIES

Riskmodell för utökat underhållsintervall på ångturbiner

Edrisi, Amir (2013) In LUTMDN/TMHP--13/5291--SE
Department of Energy Sciences
Abstract
The purpose of this project was to create a risk model for extended time between major
overhauls on steam turbines. The project was created by Siemens Industrial Turbomachinery
who develops and manufactures steam turbines and performs maintenance. It is the
turbine users who have requested a longer time in order to reduce maintenance costs and
increase availability.
Prior to the work, external and internal studies about risk analysis were done where
inspiration was obtained. A structure for the risk model was created from the studies
containing three parts; damage mechanisms, factors affecting them and analysis tool.
The investigated damage mechanisms were divided into material impact, water damages,
operation damages and... (More)
The purpose of this project was to create a risk model for extended time between major
overhauls on steam turbines. The project was created by Siemens Industrial Turbomachinery
who develops and manufactures steam turbines and performs maintenance. It is the
turbine users who have requested a longer time in order to reduce maintenance costs and
increase availability.
Prior to the work, external and internal studies about risk analysis were done where
inspiration was obtained. A structure for the risk model was created from the studies
containing three parts; damage mechanisms, factors affecting them and analysis tool.
The investigated damage mechanisms were divided into material impact, water damages,
operation damages and contaminants. These were processed and factors were pointed out.
The processing consisted of calculations, mapping, frequency & consequence analysis,
investigation of indications and possibilities of measuring damage mechanisms. From
the pointed out factors a control division between the company and the users was made
which represents from where the turbine is getting affected.
From this division, a principle for an analysis tool, was created. The tool consists of
a life time assessment where a target interval for maintenance is created and a quality
factor for control and possible change of this interval. The treatments of the damage
mechanisms are supposed to be performed in different parts of the tool. In the first part
calculations and experiences from the turbine fleet are used as an input. After that an
adaptation to the user’s target interval and conditions is made and it is possible to create
target maintenance interval. This interval is then reconciled with data during operation.
At last, experience is gathered from inspections & overhauls were planning for the next
maintenance can be made.
A future goal for the project was determined which is a translation of the damage
mechanisms into risk. The goal took inspiration from Hartford Steam Boiler presented in
the external study. The result of this goal is a ranking of the turbines by their condition
which is to be extracted from the analysis tool. Future development of the tool is needed
before it can be put into use. (Less)
Please use this url to cite or link to this publication:
author
Edrisi, Amir
supervisor
organization
year
type
H1 - Master's Degree (One Year)
subject
keywords
riskmodell underhållsintervall ångturbiner
publication/series
LUTMDN/TMHP--13/5291--SE
report number
5291
ISSN
0282-1990
language
Swedish
id
4053990
date added to LUP
2013-09-19 11:43:39
date last changed
2013-09-19 11:43:39
@misc{4053990,
  abstract     = {The purpose of this project was to create a risk model for extended time between major
overhauls on steam turbines. The project was created by Siemens Industrial Turbomachinery
who develops and manufactures steam turbines and performs maintenance. It is the
turbine users who have requested a longer time in order to reduce maintenance costs and
increase availability.
Prior to the work, external and internal studies about risk analysis were done where
inspiration was obtained. A structure for the risk model was created from the studies
containing three parts; damage mechanisms, factors affecting them and analysis tool.
The investigated damage mechanisms were divided into material impact, water damages,
operation damages and contaminants. These were processed and factors were pointed out.
The processing consisted of calculations, mapping, frequency & consequence analysis,
investigation of indications and possibilities of measuring damage mechanisms. From
the pointed out factors a control division between the company and the users was made
which represents from where the turbine is getting affected.
From this division, a principle for an analysis tool, was created. The tool consists of
a life time assessment where a target interval for maintenance is created and a quality
factor for control and possible change of this interval. The treatments of the damage
mechanisms are supposed to be performed in different parts of the tool. In the first part
calculations and experiences from the turbine fleet are used as an input. After that an
adaptation to the user’s target interval and conditions is made and it is possible to create
target maintenance interval. This interval is then reconciled with data during operation.
At last, experience is gathered from inspections & overhauls were planning for the next
maintenance can be made.
A future goal for the project was determined which is a translation of the damage
mechanisms into risk. The goal took inspiration from Hartford Steam Boiler presented in
the external study. The result of this goal is a ranking of the turbines by their condition
which is to be extracted from the analysis tool. Future development of the tool is needed
before it can be put into use.},
  author       = {Edrisi, Amir},
  issn         = {0282-1990},
  keyword      = {riskmodell underhållsintervall ångturbiner},
  language     = {swe},
  note         = {Student Paper},
  series       = {LUTMDN/TMHP--13/5291--SE},
  title        = {Riskmodell för utökat underhållsintervall på ångturbiner},
  year         = {2013},
}