HOW TO DO RLA STUDY OF TURBINE

-




 

Turbine is the most critical equipment operated in hi temperature and speed. Stress is developed due to fluctuation in temperature and frequent start// stop of the machine. If the operating temperature and differential temperature go beyond permissible limit , stress is developed.In real life situation, a component experiences combination of loading patterns whereby its life is consumed by a combination of creep damage, low cycle fatigue damage and crack propagation. Minor's sum is used to determine the life of the component under various kinds of loading patterns expected to be encountered by the component during its life span. The testing plan (typical) for turbine as per below fig.

Components

Inspection

Point/Area/Zone

Evaluation

Rotor

VI, PT, MT

All Surface

Crack,Erosion Corrosion

DI

Shroud Clearance

Creep

UT

Blade Groove

Crack, SCC

RT

High Temp. Surface

Softening

Replica

Blade Groove

SCC, Fatigue

Casing

VI, PT, MT

All Surface

Crack

RT

High Temp. Surface

Softening

RT, MT

Casing Bolt of HP Part

Creep, Softening

M.S.V

G.V

VI, PT, MT

All Surface

Crack

RT

High Temp. Surface

Softening

Replica

High Temp. Surface

Creep

RT, MT

Casing Bolt of HP Part

Creep, Softening


Inspection Points for Replication & Hardness in Turbine Rotor (Typical)

Inspection Points for Replication & Hardness in CV

Universal Turbo Tech ServiceCA And RLA Studies by NDT Tests in Hyderabad | ID: 20311134912

Comments

Post a Comment

If you any doubt please send me mail on snehamaity@yahoo.co.in

Popular posts from this blog

What are the types of CFBC Boiler

-
Image
 CFBC technology:   Coal was the main fuel in power plant and cost of coal was very cheap before 80s in India. I have seen the power plant used the coal of GCV 4000kcal/kg to 5000kcal/kg. But gradually as the industries grow up,   the demand for various grades of coal are increased and cost of generation is becoming the predominant factor. Secondly the supply of high grade coal also comes down due to depletion of coal in mines. So need of the usage of lower grade of coal arises, First AFBC technology and later on CFBC technology of Boiler are developed to use the lower grade of coal   from 2200Kcal//kg to 3000Kcal//Kg of GCV. What are the other benefits of CFBC technology? 1.        High combustion efficiency: as high as 98% 2.        Wide range of fuel can be used: lower grade of fuel i.e sponge iron kiln reject (dolochar )GCV as low as 1000 kcal/kg can be used with mixing with higher grade of coal , coal m...
Read more

Reason For Silica Deposition In Turbine

-
Image
  Silica Deposition in Turbine How is silica coming to turbine? There are two types silica : 1. Colloidal Silica: SiO2-O-SiO2-  More prevalent in water from surface source pH>7,, this is insoluble and mainly removed by UF, Coagulation, Nano filtration. 2. Reactive Silica: (OH)3Si-O- This is soluble  and removed by EDI (Electro deionisation), RO. But  Silica is coming in turbine through steam from Boiler. Silica in steam should be less than 0.02ppm . It can be increased due to following reason: 1.        High silica level in steam drum: : Silica in drum should be less than 2ppm upto 100ata drum pr ref fig below (drum pr vs silica level and pH) .If it increases above this value, blow down (IBD and CBD ) should be operated to control the silica level.   Secondly it can be seen when boiler is not properly cleaned during commissioning time. It can also be seen due to lower steam separator efficiency in boiler drum. 2.   ...
Read more