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Instrument and Plant Air Drying
Gas Treatment & Drying

Instrument and Plant Air Drying

Heatless desiccant drying of compressed instrument air and plant air using activated alumina to deliver pressure dew points below minus 40 °C for DCS pneumatic systems.

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The Challenge
Wet instrument air corrodes pneumatic valve actuators, freezes in winter operations and offshore platforms, and triggers nuisance alarms when the moisture condenses in transmitters; failure consequences range from plant trip to safety system unavailability.
Quick Answer

Instrument and plant air drying delivers dry, clean compressed air for distributed control system pneumatic valves, instrument bubblers, and plant air services. A twin tower heatless desiccant dryer charged with activated alumina drying grade cycles every 4 to 10 minutes between adsorption and pressure swing regeneration, holding pressure dew point below minus 40 °C.

Instrument and Plant Air Drying

Instrument Air Reliability Is Plant Reliability

Distributed control system pneumatic valves, instrument bubblers, control valve positioners, and plant air services across every process plant run on compressed air. The air must be dry enough that no water condenses in the coldest part of the distribution piping; on an offshore platform or a winter onshore plant that target is a pressure dew point below minus 40 °C. Failure modes range from nuisance alarms and instrument drift to full plant trip when a control valve seizes on frozen water.

Heatless Desiccant Dryer Operation

The SorbiTech heatless desiccant air dryer uses twin towers of activated alumina drying grade in a fast pressure swing cycle. One tower is on adsorption at line pressure; the other regenerates by depressurising to atmospheric and purging with dry product air drawn from the on line tower. The cycle repeats every 4 to 10 minutes. No regeneration heater is needed, the cycle runs entirely on the energy already in the compressed air system.

Instrument and Plant Air Drying process equipment

Activated Alumina Resists Fast Cycling

The deciding adsorbent property is attrition resistance. Heatless cycles produce mechanical stress on the bed at every pressurisation; softer media break into fines that discharge through the downstream filters and contaminate instruments. The SorbiTech activated alumina drying grade meets ASTM D4058 with attrition loss below 0.3 percent, which holds the bed integrity through 5 to 7 years of fast cycling without measurable dusting.

Delivery and Sector Coverage

Delivered as a packaged heatless dryer by SorbiTech with the SorbiTech alumina charge, instrument air filters, and outlet quality monitoring. Common applications across industrial gas, oil and gas (especially offshore), petrochemicals and refining, and pharmaceutical sites where the DCS depends on instrument air integrity.

Selection Guidance

Heatless desiccant dryer with activated alumina drying grade (high attrition resistance) for industrial and offshore service. Silica gel white for clean dry feed. Sized for the plant air consumption peak plus a margin.

How SorbiTech Solves It

A Specified, Verified Solution

Define the duty

We capture your process conditions: flow, composition, pressure, temperature, and the target outlet specification.

Select media & configuration

Our engineers recommend the adsorbent grade and system type that meet the duty with margin.

Size & engineer

Bed sizing, vessel design, and cycle parameters are engineered to your case and documented for approval.

Commission & verify

We support loading, start up, and performance verification against the guarantee.

Recommended Products & Systems

Media

Adsorbents & Media

  1. 01 SorbiTech Activated Alumina Drying Grade Compressed Air Desiccant ISO 8573 Adsorbent Activated Alumina Drying Grade High capacity activated alumina for compressed air dryers, gas dehydration, and heatless desiccant systems. Water Cap. ≥ 20 %
  2. 02 CMS 450hp Adsorbent Carbon Molecular Sieve CMS 450HP Ultra high purity carbon molecular sieve. 99.99999 percent (7N) N2, selective O2 and CO2 capture, 1.0 to 1.6 mm pellets, minimal fines, deoxo polishing… Water Cap. Feed must reach ISO 8573 class 1.4.1, deoxo polishing recommended for 7N %
  3. 03 CMS 420kt Adsorbent Carbon Molecular Sieve CMS 420KT High efficiency carbon molecular sieve. Higher oxygen affinity under 7 to 12 barg, 1.2 to 1.8 mm pellets, Snowstorm Filling compatible, ASTM D4058 attrition… Water Cap. Feed must reach ISO 8573 class 1.4.1 %
  4. 04 CMS 350kt Adsorbent Carbon Molecular Sieve CMS 350KT Rapid adsorption carbon molecular sieve. 40 to 90 second cycle at 7 to 10 barg, up to 99.99 percent N2, 1.0 to 2.2 mm… Water Cap. Moisture at supply below 1.0 percent, feed must reach ISO 8573 class 1.4.1 %
  5. 05 Activated Alumina Aa 201 Adsorbent Activated Alumina Impregnated Promoter loaded activated alumina for hydrogen sulphide, chloride, and Claus tail gas guard duty. Form 3–5 mm spheres · 1.6–3.2 mm spheres
  6. 06 CMS 260l Adsorbent Carbon Molecular Sieve CMS 260L Affordable carbon molecular sieve. 1.2 to 1.8 mm pellets, sub 10 Angstrom pore, 95 to 99.9 percent N2 from compressed air at 7 to… Water Cap. Intolerant of liquid water, feed must reach ISO 8573 class 1.4.1 %
Equipment

Engineered Systems

  1. 01 SorbiTech Heatless Desiccant Air Dryer Compressed Air ISO 8573 Twin Tower Dryer Equipment Heatless Desiccant Air Dryer Twin tower heatless desiccant compressed air dryer using activated alumina or silica gel for instrument and process air to pressure dew points below minus… Capacity 50–10,000 Nm³/h
  2. 02 SorbiTech Transformer Breather Cartridge System Silica Gel Grid Utility Breather Equipment Transformer Breather Cartridge System Pre packaged stainless steel transformer breather cartridge with indicating silica gel for grid transformer moisture protection across the high voltage transmission and distribution network. Capacity 0.5–25 kVA transformer to 800 kV substation
  3. 03 SorbiTech Cryogenic ASU Pre Purification Package ASU Front End 13x Alumina TSA Towers Equipment Cryogenic ASU Pre Purification Package Front end TSA pre purification package for cryogenic air separation units removing water, carbon dioxide, and trace hydrocarbons before the cold box. Capacity 5,000–500,000 Nm³/h air
  4. 04 SorbiTech Biogas Upgrading Unit Biomethane PSA Carbon Molecular Sieve Equipment Biogas Upgrading Unit PSA biogas upgrading unit using carbon molecular sieve to separate carbon dioxide from methane and deliver grid quality bio methane from anaerobic digester biogas… Capacity 50–2,000 Nm³/h raw biogas
  5. 05 SorbiTech Oxygen Vpsa Package Industrial Oxygen Vpsa Steel Mill Blast Furnace Equipment Oxygen VPSA Package On site vacuum pressure swing adsorption (VPSA) oxygen generation package delivering 90 to 95 percent oxygen for medical, aquaculture, ozone generation, and metals applications. Capacity 50–2,500 Nm³/h O₂ (90–95 % purity)
  6. 06 SorbiTech Gas Sweetening Unit H2S CO2 Removal 13x Mol Sieve Equipment Gas Sweetening Unit Molecular sieve and impregnated carbon gas sweetening unit for H₂S, CO₂, and mercaptan removal from natural gas, refinery gas, and LPG streams. Capacity 0.5–500 MMSCFD
Industries

Industries Using This Application

  1. 01 SorbiTech Industrial Gas Air Separation ASU Cryogenic Distillation Cold Box Sector Industrial Gas & Air Separation Molecular sieves and carbon molecular sieve plus PSA/TSA systems for nitrogen and oxygen generation and cryogenic air separation pre purification.
  2. 02 SorbiTech Petrochemicals Refining Integrated Cracker Complex Distillation Columns Sector Petrochemicals & Refining Adsorbents and separation systems for feedstock drying, process gas conditioning, solvent recovery, and refinery effluent treatment.
  3. 03 SorbiTech Oil Gas Offshore Platform Upstream Production Sector Oil & Gas Complete dehydration, separation, and treatment across upstream, midstream, and downstream oil and gas. SorbiTech supplies the adsorbent media and the engineered systems from one…

Specify a Solution for This Application

Provide your process conditions and our team will recommend the grade, configuration, and sizing.

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