Use a Strainer or Bypass the Unit During Startup

Use a Strainer or Bypass the Unit During Startup

During startup, it is advisable to include a temporary strainer on the cold or hot water inlet as well as the inlet of the process liquid. Altern- atively, bypass the heat exchanger altogether during startup. Even if your liquids are clean, with no particulates present, a temporary strainer or bypass configuration around the PHE is recommended for new, startup applications. During construction, it is all too common to see dirt, weld beads and other debris get into tanks and piping, and then get pumped through the system. (I once found a work boot in the suction line of a large pump.) If this debris finds its way into the exchanger, it may get trapped, causing an increase in pressure drop and a decrease in heat transfer efficiency.

Use a Strainer or Bypass the Unit During Startup

Figure 2. The plates in a plate-and-frame heat exchanger typically are in a chevron or V-shape. Every other plate is reversed, causing a waffle-type grid between those plates. Most PHEs will allow 0.0625″ or smaller particles to pass through without fouling. For liquids containing larger particles, wide-gap plate designs are available.

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