Processing » Heat Exchangers » Double Pipe Heat Exchangers » China

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Overview

Double pipe heat exchangers consist of one tube inside a larger tube, allowing two fluids to exchange heat in counterflow or parallel flow. They are ideal for small-capacity, high-pressure or viscous-fluid jobs and where full fluid separation is required. Simple to design, inspect and service, they’re common in chemical, oil & gas, pilot plants and HVAC. Pick appropriate materials, length and flow arrangement to meet duty, pressure drop and maintenance needs.

FAQ

What should I check when buying a double pipe heat exchanger?

Verify materials, overall length, inner/outer diameters, pressure and temperature ratings, heat duty calculations, construction drawings, test certificates and any history of repairs or leaks.

How do I size and specify the exchanger?

Provide required heat duty, inlet/outlet temperatures, flow rates, allowable pressure drop and fluid properties. Specify flow arrangement (counterflow is most efficient) and any space constraints.

How should it be prepared and shipped?

Drain and clean thoroughly, cap or blank ends to prevent contamination, brace long tubes to avoid bending, use crates or skids, protect against corrosion and choose a carrier experienced with long/heavy loads.

What routine maintenance is required?

Inspect for leaks, corrosion and erosion; clean fouling with mechanical or chemical methods; check seals and joints; monitor pressure/temperature trends; and replace worn tubes or gaskets as needed.

How do I choose materials for corrosive or hot fluids?

Select alloys (stainless, duplex, nickel alloys) based on corrosion resistance, temperature limits and compatibility. Consider galvanic corrosion if dissimilar metals are used and consult corrosion data.