Chemco Case Studies

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Cavitation Protection on Valve Paddle

Industry                           

Power Generation

 

Date

2017

 

Substrate

Rubber Lined Mild Steel

 

Products

Epo-Chem™ RS 500P a wet and surface tolerant mio epoxy primer

Epo-Chem™ RP 500 series, a moisture tolerant ceramic filled epoxy top coat, providing excellent long term cavitation resistance.

InD-cote™

 

Environment

15°C – 30°C sea water

 

Challenge

The 10-year-old valve experiencing cavitation damage with replacement unavailable within a reasonable time frame. Quick turnaround for return to service required.

 

Chemco’s Solution

Protect critical surfaces by masking and abrasive blast areas to be repaired.

Weld new gussets to provide mechanical strength where lost.

Application of Epo-Chem™ RS 500P to a nominal thickness of 100µm, rebuild original profile height using InD-cote™ and top coat using Epo- Chem™ RP 500 with a nominal DFT of 350µm

 

Typical extent of cavitation found
Typical extent of cavitation found
After abrasive blasting to expose extent of the damage
After abrasive blasting to expose extent of the damage
Kevlar is used to provide cavitation resistance
Kevlar is used to provide cavitation resistance
Paddle refurbishment complete
Paddle refurbishment complete

 

Results

Valve parts are not available from the OEM and a replacement was going to cost an estimated $120K. The repairs have effectively saved the asset owner considerable time and money in full valve replacement. The refurbished paddle is now reinforced using Kevlar and expected to provide more than 10 years of additional service life. For more information please feel free to contact Chemco on 1300 CHEMCO (243 626).

 

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