Used API Double Pipe Heat Exchangers

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.

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.

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.

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.

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.