Correct selection is the basis for stable long-term operation of a spiral plate heat exchanger. The sequence below keeps the thermal, mechanical and maintenance requirements connected.

Step 1: Define the complete duty

Record the hot and cold media, flow rates, inlet and outlet temperatures, allowable pressure drop, design pressure and design temperature. These values are the basis for the surface area. A margin of 15–20% is often allowed for fouling over time.

Step 2: Select material and channel

Clean media such as water and oil can use carbon steel or 304 stainless steel with a standard channel gap. High-viscosity, particle-laden or crystallising media need a wider channel. Corrosive fluids may require 316L or titanium.

Step 3: Choose the construction

A detachable design is used where regular mechanical cleaning is required. A fully welded design suits clean media and higher pressure. Vertical installation helps with sediment and drainage; horizontal installation saves space for clean media.

Step 4: Check pressure drop and velocity

Balance heat transfer against pumping energy, leave access for maintenance, and compare capital cost with cleaning cost over the service life.

Mazelu can compare a spiral plate unit with a shell and tube exchanger for the same duty.