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How to Select the Right Material for Plate Heat Exchanger?

Selection is a systematic process:

1. Identify the Fluids: What two fluids are on each side of the plates? (e.g., Cooling Tower Water vs. Process Fluid).
2. Analyse Fluid Chemistry:
   1. pH Level (Acidic, Neutral, or Caustic)
   1. Chloride Content (This is critical for stainless steels)
   1. Presence of Oxidizing Agents
   1. Other specific ions or chemicals

1. Determine Operating Conditions:
   1. Maximum and Minimum Temperature
   1. Operating Pressure
2. Consult Compatibility Charts: Manufacturers provide detailed corrosion and gasket compatibility charts. Always consult these for your specific service conditions.
3. Consider Total Cost of Ownership: A more expensive material like Titanium may have a higher upfront cost but will be far more cost-effective over 15 years than replacing a 316L unit every 3 years due to chloride cracking.

Typical Examples:

• HVAC System (Chilled Water): 304/316 Plates with NBR Gaskets.
• Seawater Cooling: Titanium Plates with EPDM or Viton® Gaskets.
• Dairy Pasteurization: 316L Plates with EPDM or NBR (FDA-approved) Gaskets.
• Chemical Process with Acids: Hastelloy or Tantalum Plates with FKM Gaskets.