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Quotes - Engineering - SalesU-Tube Heat Exchangers For
Double Tubesheet Design
U-Tube Duty
The interspace is the open, vented gap between the two tubesheets. Tubes pass through both. Any leak at either joint discharges into that gap and leaves through a telltale connection rather than crossing between the two fluids.
Dimension. Wide enough for a leak to be visible and to drain freely, narrow enough not to waste tube length or leave the tubes inadequately supported. It is an engineered dimension rather than a standard one.
Thermal behaviour. The tube section in the interspace is exposed to ambient air rather than to either process fluid, so it sits at an intermediate temperature and is unrestrained. On duty with heavy thermal cycling this affects the design of the gap and the joint detail.
Request a QuoteDouble Tubesheet Design Applications
Choosing a Detection Method
An open telltale checked on rounds suits duty where a slow leak found within a shift is acceptable. Where it is not, the interspace can be instrumented, and the sensor should match the leak you are actually worried about.
A conductivity probe responds quickly to an aqueous leak and slowly to clean condensate. A level switch needs enough accumulation to trip. A pressure transmitter on a closed interspace responds fastest but requires a sealed design rather than an open one, which is a different exchanger.
Selection Data We Need
Flow rate and identity of both fluids, inlet and required outlet temperatures, operating and design pressures, allowable pressure drop on each side, and any code, alloy or hygienic requirement. Fouling history, turndown range and cleaning method matter as much as the design point.
