Major Overhauling

Measurements

Major Overhauling

(In Co-Ordination with Electrical, Civil, Instrumentation departments)

INITIAL MEASUREMENTS:

Rotor "K" Position
Casing Split (half joint) Clearance

Bearing pedestal Clearance

Casing bolts length measurement (Before & After removal)

Coupling Bolts length measurement (Before & After removal)

Steam admission flange bolts length measurement (Before & After removal)

Pedestal clearance

Pedestal seal clearance

Bearing seal clearance

Journal bearing clearance

Gland seal clearance

Thrust bearing clearance

Thrust bearing seal clearance

Main oil pump seal clearance 

Initial Alignment

SEQUENCE OF DISMANTLING:

Remove Turning Gear unit

Remove coupling cover

Remove coupling bolts

Remove Bearing pedestals

Remove Front & Rear gland boxes

Remove casing bolts by heating (by special bolt heater)

Remove steam admission flange bolts

Remove thrust bearing housing

Remove HP, LP, Throttle (ESV) Valve actuators.

 

Over View

STEAM TURBINE

It is a thermodynamic machine.

Principle: Pressure energy is converted in to kinetic energy and get mechanical work done. 

Steam turbines are used broadly in Thermal, Nuclear power plants for electric power generation.

Major Classification:

By Working Priciple: 

• Impulse Turbine
• Reaction Turbine
• Impulse Reaction Turbine

By Exhaust Condition:

Condensing Turbine - Condenser - Vacuum - Ejector

Non-Condensing Turbine (Back Pressure Turbine) - No Condenser - No Vacuum - No Ejector

By Steam Flow:

        Single Flow

                            Axial Thrust is huge

        Double Flow

                            Axial Thrust is balanced

About me

 

I am being a Mechanical engineer with 40 years of experience in maintenance of production line and Power plant machines. During my services, I had come across many different kinds of problems and breakdowns which leads to partial or total shutdown of the plant. A suitable & safe method had to be adopted to fix the deficiency and put back the machine into operational. 

In my entire tenure, I had taken up many challenging tasks and successfully solved the issue. To expedite the maintenance, it is very much essential to understand the technology of machine. 

The idea of this website is to share my experience with young generation of Mechanical Engineers. 

Here is a moral story of an Old man's Experience.

A giant ship engine failed. The ship’s owners tried one expert after another, but none of them could figure but how to fix the engine.

Then they brought in an old man who had been fixing ships since he was a young. He carried a large bag of tools with him, and when he arrived, he immediately went to work. He inspected the engine very carefully, top to bottom.

Two of the ship’s owners were there, watching this man, hoping he would know what to do. After looking things over, the old man reached into his bag and pulled out a small hammer. He gently tapped something. Instantly, the engine lurched into life. He carefully put his hammer away. The engine was fixed!

A week later, the owners received a bill from the old man for ten thousand dollars.

“What?!” the owners exclaimed. “He hardly did anything!”

So they wrote the old man a note saying, “Please send us an itemized bill.

The man sent a bill that read:

Tapping with a hammer………………….. $ 2.00

Knowing where to tap…………………….. $ 9,998.00

Effort is important, but knowing where to make an effort makes all the difference!

Good Luck