HTWU Series High Tube Pressure Heat Exchangers

When the Tube Side Runs Above the Standard Rating

Most Bell & Gossett shell and tube units carry a 125 or 150 PSI tube-side rating, which covers the great majority of hydronic and process duty. The HTWU exists for the cases it does not: the tube side is rated to 400 PSI while the shell stays at 150.

Tall buildings are the classic case. Static head alone puts a high-rise hydronic riser above 150 PSI at the bottom of the stack, and adding pump head on top of that quickly exceeds a standard rating. The HTWU handles the pressure without moving the whole selection into engineered construction.

High head pumping circuits are the other. Long distribution runs, deep well systems and circuits with significant elevation change all raise tube-side pressure beyond what the standard range permits, even where the temperatures involved are unremarkable.

The asymmetry is deliberate. Raising the tube-side rating is far cheaper than raising the shell rating, because tubes and tubesheets are small pressure boundaries and a shell is a large one. Putting the high-pressure fluid in the tubes and keeping the shell at 150 PSI is what makes the HTWU an economical answer rather than a costly one.

Everything else follows the WU. Removable U-tube bundle, cast iron bonnets, steel shell and tubesheet, and 2, 4 and 6 pass tube-side arrangements across a 4 to 12 inch shell range.