Natural Gas Dehydration
Removing water vapour from natural gas to prevent hydrates and corrosion and to meet pipeline dew-point specification, using molecular-sieve TSA adsorption.
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Gas Treatment & Generation
· Engineered by PuraSpecs
Twin-Tower TSA Gas Dehydration Unit
Continuous-duty temperature-swing adsorption dehydration package for natural gas, engineered by PuraSpecs to ASME VIII / PED with integrated regeneration heater and cooler.
Quick Answer
A Twin-Tower TSA Dehydration Unit uses two parallel molecular-sieve beds on alternating adsorption and regeneration cycles to continuously dehydrate natural gas. One vessel adsorbs water while the other regenerates at 250–300 °C, achieving outlet dew points below −40 °C at pipeline pressure.
System Overview
The Twin-Tower TSA Dehydration Unit is the industry-standard configuration for continuous natural-gas dehydration. Two identical vessels operate 180° out of phase: while one adsorbs water at operating conditions, the other is heated, purged, and cooled — giving uninterrupted gas processing.
Design & Construction
Vessels are designed and fabricated by PuraSpecs to ASME VIII Div.1 or PED. Carbon-steel shells with 316L internals (screens, support grids, distributors) protect the molecular-sieve charge, and the regeneration heater is ATEX/IECEx rated for hazardous areas.
Treatment Train
A complete train typically includes an inlet coalescer to protect the bed from liquids, the twin-tower vessels, the regeneration heater and cooler, a media loading/unloading system, and the PLC/DCS sequence controller.
FAQ
Why two vessels instead of one?
A single adsorber would have to go offline to regenerate, interrupting gas flow. Two vessels on alternating cycles allow continuous processing with no interruption.
Can it handle sour gas?
Yes. With appropriate metallurgy (NACE MR0175/ISO 15156) and bed-sizing margin, the unit operates reliably in the presence of H₂S and CO₂.
Available as
Project References
Selected installations — anonymised where naming clearance is pending.
80 MMSCFD natural gas dehydration · twin 1.8 m dia. vessels · Middle East upstream (anonymised)
12 MMSCFD wellhead gas TSA unit · offshore platform · Gulf region (anonymised)
Biogas dehydration before compression · landfill-to-grid · European operator (anonymised)
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Petrochemicals & Refining
Adsorbents and separation systems for feedstock drying, process-gas conditioning, solvent recovery, and refinery effluent treatment.
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