Custom U-Tube
Heat Exchangers

Yes, to the nozzle positions, support centers, bolt circles and overall length, provided a drawing, U-1 data report or a nameplate with field measurements exists. What we deliberately do not copy is a mistake: a vent the original lacked, a pass arrangement that never suited the flow, or a rolled joint that should have been welded. Those are flagged and offered as options, so the drop-in fit is preserved and you choose. One measurement decides most of it: the distance between nozzle centerlines, because piping is the thing that cannot move. Measure that to the sixteenth of an inch.

Yes; the Authorized Inspector for the ASME stamp is standard, and an owner's or insurer's inspector can attend material receipt, tube rolling, welding, the hydrostatic test or any other hold point your specification names. State the hold points at inquiry, because each one pauses fabrication until the inspector has been and gone, and a late request can add weeks when a witness must travel. Send the inspection and test plan and the visit dates are set before plate is cut.

Yes, and on a plant installation you should, because the default is that nozzles carry only the pressure load and the supports carry only the vessel weight. Send the piping loads as forces and moments on each nozzle, the seismic design category or site accelerations, and the wind case if the unit sits outdoors. They are applied in the mechanical design and change saddle plate thickness, anchor bolt size and nozzle reinforcement, not the thermal rating. The common failure is a saddle sized for weight alone, bolted to a pad that cracks under the first thermal push from the piping.

Give the design pressure, which is the relief valve set pressure or the maximum the system can deliver with the pump dead-headed, not the normal operating pressure. The code stamp is to the design value, and it sets shell thickness, tubesheet thickness and flange rating on each side. A steam side is rated to the boiler relief setting rather than the reduced pressure the control valve usually holds, because a failed-open valve puts full header pressure on the shell. State both sides separately; a modest clamp rating on the tube side beside an industrial steam shell is normal.

Say so, and the rating will use a stated fouling resistance drawn from the fluid type and service history rather than a silent default, with the value printed on the datasheet. A fouling factor is a resistance added to each side that reserves surface for the deposit expected between cleanings; to small and the unit falls short within a year, too large and you pay for surface that mostly adds pressure drop. Tell us what the stream is, how it has fouled elsewhere in the plant and how often cleaning is acceptable, and the number becomes a decision rather than a guess.