Tray-type and packed-type distillation, absorption, stripping, and fractionation columns — engineered from process simulation through hydrostatic test and fabricated to ASME Section VIII Division 1 & 2.
A column or tower is a tall vertical pressure vessel that brings a rising vapor phase into intimate contact with a descending liquid phase, so components can transfer between the two based on differences in volatility, solubility, or reactivity. Distillation columns separate a liquid mixture by boiling point, using reboiler-generated vapor and condenser reflux. Absorption and stripping columns transfer a target component into or out of a liquid solvent — absorption pulls a component into the liquid, stripping drives it back out, often with heat or steam. Fractionation towers extend the same principle to multiple simultaneous product cuts, common in crude and gas processing trains.
Before a shell course is ever rolled, Fintelius runs process simulation and separation feasibility modeling against the feed composition, corrosivity, fouling tendency, and reaction chemistry — then sizes the shell, internals, and support structure to match.
Every column follows the same disciplined path through the shop, whatever its internals or service.
Feed composition, corrosivity, fouling tendency, and separation duty are modeled to size the shell diameter, height, and internals.
Plate is rolled into shell courses and joined by longitudinal and circumferential welds to the design diameter and wall thickness.
Welds are radiographed and ultrasonically tested; thick-walled sections undergo post-weld heat treatment to relieve residual stress.
Trays, packing supports, distributors, and downcomers are installed and leveled to the process design.
The complete vessel is hydrostatically tested, coated, and prepared for shipment — in sections for tall towers where required.
Separates a liquid mixture into components by boiling point, using reboiler vapor and condenser reflux — the core unit operation of a fractionation train.
Transfers a target component between a gas and liquid solvent — absorption towers for amine/glycol gas treating, strippers to regenerate the solvent.
Multi-product distillation with several side draws, producing a range of cuts simultaneously — debutanizers, depropanizers, and demethanizers.
Trays generally handle higher liquid loads and are easier to inspect; packing offers lower pressure drop and higher separation efficiency per unit of height.
Simple perforated plates — low cost, good capacity, but less turndown flexibility than valve trays.
Moving caps open with vapor flow, giving better turndown and operating flexibility across varying loads.
The most flexible turndown of any tray type, at higher cost and pressure drop — specified for legacy or highly variable-load service.
Corrugated metal or plastic sheet packing — low pressure drop and high efficiency, favored in vacuum towers.
Raschig rings, Pall rings & Berl saddles — cheaper and more robust in fouling or corrosive service, at lower efficiency than structured packing.
Support plates, hold-down grids, and liquid redistributors installed every several bed heights to prevent channeling.
Wind, seismic, and thermal loading make column mechanical design a discipline of its own.
Plate rolling and forming to the design diameter, course length, and wall thickness set by pressure and corrosion allowance.
Skirt and anchor bolt design engineered for combined dead load, wind, seismic, and thermal loading on tall towers.
Feed, reflux, draw, vent, and instrumentation nozzles with reinforcement pads; manways for internal access.
Maintenance-access hardware supporting tray and internals servicing without external crane dependency.
Overturning moment and base shear analysis for tall vertical vessels, feeding directly into skirt and shell design.
Stress-relief heat treatment for thick-walled shell sections per code requirements.
Weld integrity verification across longitudinal and circumferential shell seams before hydrostatic test.
Full-vessel pressure testing to design specification prior to dispatch.
Insulation for energy conservation, personnel protection, or freeze protection, plus protective coating systems.
Primary fractionation of crude oil into naphtha, kerosene, diesel, and gas oil cuts in refinery operations.
Amine absorption & regeneration towers and glycol dehydration columns removing acid gas and water vapor from produced gas.
Debutanizer, depropanizer & demethanizer columns splitting NGL streams into individual product components.
Stabilizer columns setting condensate vapor pressure to meet pipeline and storage specifications.
Separation and purification columns for biofuel production and general chemical processing operations.
Absorption-based scrubbing towers for emissions control and environmental compliance.