Chemical foam cleaning of steam and gas turbines and other rotating equipment

! A proven process designed to remove deposits from steam path components using foam to deliver the required chemicals

! No disassembly of turbine required! Cleaning (chemical proces) is completed in 24 hrs

or less

! For Large steam turbine (most common: copper oxide/Iron oxide build-up, salts)

! Industrial Steam Turbines (most common deposits: various salts)

! For Combustion Turbines (deposits vary widely).

What is Foam Cleaning of Steam Turbines?

What is Foam Cleaning for?

Effects of deposits on turbine blades:

Benefits of Foaming Turbines

Foam Cleaning Time TableFoam consystency

Typical source & cause for copper deposits

Chemical removal of deposits from turbine rotors

• Blades are of an airfoil design for efficiency• Deposits change the shape of the blade• Increases the surface area• Affects the flow across the surface• Reduces blades efficiency resulting in overall

turbine efficiency drop, pressure build up etc.

• Turbine cool down (60 hrs)• Set up/Chemical prep (during cool down)• Trial Foam Test (1 hr)• Chemical cleaning (5 hrs)• Foamed water rinse (2 hrs)• Saturated steam rinse (12 hrs)• Normalize turbine for operation (16 hrs)• Total 96 Hrs

• Quick & Easy • No disassembly required• Less costly than other mechanical methods• More effective than other methods• Does not remove base metal

• Leaves blades clean and smooth• Immediate results

• Short payback period

• Corrosion of copper alloy tubes• Surface Condenser (air-in leakage)• HP & LP feed water heaters

• Stored in Primary Superheater Tubes • Drum liner cracks• Carry over with steam during unstable conditions

(during start up)• De-superheat spray

Results of foam cleaning process

Chemical removal of deposits from turbine rotors

10,0010,2510,5010,7511,0011,2511,5011,7512,0012,2512,5012,7513,0013,2513,5013,7514,0014,2514,5014,7515,0015,2515,50

800 850 900 950 1000 1050 1100 1150 1200Live steam flow F [t/h]

u Before foamcleaning

n After foamcleaning

Pressure in reg. wheel chamber in 370MW BBC/Alstom steam turbine

before and after cleaning

Pressure limit 15,2 MPa

Pre

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re in

re

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he

el ch

em

be

r P

[M

Pa

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Ecol North America, LLCwww.ecolnorthamerica.com

Contact person:

Danny Fostermobile: +1 352.638.2629

danny.foster@ecolnorthamerica.com

contact:

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EN.US.04.2017

years of complex

industrial service by Ecol Group