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Petrochemical | Low temperature

Custom metal valve seat

Problem

Graphite seat originally installed was facing ingress from the acidic media due to the ball valve movement. This was leading to pitting corrosion causing potential leaks and locking in place. The customer had restricted access to the valve reducing the window of opportunity to repair the valve.

Application

Floating Ball Valve with a graphite seat

  • Size: 2"
  • Expected temperatures: between 250°C to 350°C
  • DN size: 50
Existing solution

Graphite seat.

James Walker solution

Working with the customer we developed a specifically designed metallic seat to a specification to suit the ball valve's hardness properties eliminating any risk of damage to the valve. We also machined a new ball and lapped together to ensure robust integrity. We took their existing design and modified the seats together with the ball in stainless steel material so it correctly located within their valve design for them during the next downtime to install.

Results and benefits

The replacement was successful due to the mechanical properties of metal being able to survive the corrosive nature of the media in contrast to the graphite version of the seat which broke down. They customer is considering modifying their graphite seat valves to metallic designs for the future.

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Less downtime
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Lower long term costs
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Reduction in maintenance requirements
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