Caustic Potash (KOH - Potassium Hydroxide) service
Service Selection
Ball Valves for Caustic Potash (KOH - Potassium Hydroxide) Service
Which ball valves configuration suits Caustic Potash (KOH - Potassium Hydroxide) (KOH), in which material, to which standard — from real service data, with the pitfalls flagged.
Which ball valves for Caustic Potash (KOH - Potassium Hydroxide)?
Ball Valve (SS 316L or PTFE-lined) - Standard isolation for KOH dilution and distribution pipelines Typical service window: 1–20 barg, Ambient to +120°C.
Recommended Configurations
Ball Valve (SS 316L or PTFE-lined)
Standard isolation for KOH dilution and distribution pipelines
Body Material for Caustic Potash (KOH - Potassium Hydroxide)
Rated from real compatibility data - click any material for the full decision page.
Governing Standards for Caustic Potash (KOH - Potassium Hydroxide) Service
What to Avoid in Caustic Potash (KOH - Potassium Hydroxide) Service
- Aluminium or zinc-lined valves
- Unlined carbon steel for hot concentrated KOH
Service Considerations
- Hot concentrated KOH (>50%, >80°C) causes stress corrosion cracking of carbon steel welds - PWHT required
- PTFE-lined or Hastelloy valves preferred above 80°C and >35% concentration
- Dilute KOH at ambient temperature: SS 316L acceptable and most economical
- Green hydrogen electrolysers: KOH electrolyte at 25–35%, 80–90°C - SS 316L or Ni 200 valves
Other valve types for Caustic Potash (KOH - Potassium Hydroxide)
Ball Valves for other services
Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026
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