Case Study

Case Study – 6″, 10″ and 14″ Wedge gate valve, cover and pedestals


Engineering industry.

Application date

March 2021.

Scope of work

Internal and external corrosion protection of 6″, 10″ and 14″ wedge gate valves, bodys, covers and pedestals. The valve is subject to crude oil at a maximum service temperature of 80°c.


Internal: Polyglass VEF/VEHA

External: Plasmet ZF, Corrocoat Zip E, Corrocoat AP1 coating system


Ductile steel.

Coating system

  • Rebated flange faces and masked up machine surfaces to protect prior to abrasive blasting and coating.
  • Abrasive blasted internally to ISO 8501-1 to Sa2½ surface finish, to achieve a surface profile of 50 microns.
  • WGC Body, cover, wedge and yoke; applied Polyglass VEF to wetted surfaces to achieve a minimum DFT (Dry Film Thickness) of 1250 microns.
  • Thickness checked and spark tested at 17kva.
  • Abrasive blasted the specified external surfaces with new abrasive in accordance with  ISO 8501-1 to Sa2 finish, to achieve a minimum surface profile of 50 microns.
  • Applied coat of Plasmet ZF Primer to achieve a DFT of between 500-700  microns.
  • Applied top coat of Corrothane AP1 – colour: RAL 1023

Coating credentials

Corrocoat products are perfect for withstanding harsh operating environments. Our unique high-performance composites and coatings not only fight against corrosion, they also prolong the life of metals and machinery.

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