Recovery depth is an economic decision made in engineering terms. Ethane recovered as liquid earns petrochemical feedstock value; ethane left in the gas earns heating value. The spread between these determines whether a plant should operate in ethane recovery or ethane rejection mode, and modern plants are designed to switch between them. Propane and heavier components almost always justify recovery, but the process route chosen, and the pressure and temperature it operates at, determine how much of the available liquid is actually captured and how much power is consumed doing it.

The engineering constraint is cold. Recovery requires low temperature, low temperature requires refrigeration or expansion, and both require energy and equipment. Turboexpander plants generate their own refrigeration by expanding the gas through a machine that recovers shaft work to drive the recompressor, which is why they dominate deep recovery service. Their performance depends on residue gas recycle configuration, column overhead arrangement, heat integration and expander efficiency, and small changes in these produce measurable changes in recovery.

Freeze-up is the operating hazard that shapes the design. Water freezes, hydrates form, and carbon dioxide freezes as solid at cryogenic conditions. Feed gas must therefore be dehydrated to very low water content before entering a cryogenic unit, and carbon dioxide content sets a limit on how cold the demethaniser can operate. Ignoring these constraints produces plugged exchangers and columns and unplanned shutdowns.

Fractionation converts the recovered mixed liquid into products with contractual specifications. Vapour pressure, component purity, sulphur content and colour are all controlled through column operation. Fractionation columns are also the most common location for capacity limitation in a gas plant, since flooding, weeping, fouling and reboiler limitations all present as an inability to meet specification at rate.

By the end of this training, participants will be able to:

• Interpret hydrocarbon phase behaviour, dew point curves and retrograde condensation and apply them to recovery process selection
• Evaluate NGL recovery options against liquid value, gas value, power cost and recovery target
• Describe Joule-Thomson, mechanical refrigeration and turboexpander recovery processes and their achievable recovery levels
• Analyse turboexpander plant configuration including residue recycle, reflux arrangements and heat integration
• Explain demethaniser and deethaniser operation and the variables controlling methane and ethane rejection
• Design and sequence a fractionation train to produce specification ethane, propane, butane and natural gasoline
• Calculate column reflux, reboiler duty and stage requirements for defined product specifications
• Specify feed conditioning requirements including dehydration, carbon dioxide limits and mercury removal
• Diagnose recovery loss, column flooding, specification failure, freeze-up and fouling in recovery and fractionation units

The training develops phase behaviour and thermodynamics first, then applies them successively to each recovery process and to fractionation, so that plant configuration is understood as a consequence of physical constraints rather than as a fixed arrangement. Phase envelopes, dew point calculations, recovery estimates, column material balances, reflux ratio and duty calculations are worked through numerically for representative gas compositions. Plant configurations are examined through process flow diagrams from operating facilities, and recovery performance is compared across process routes. Operating problems are presented through documented cases of recovery loss and column upset, and participants are encouraged to bring plant performance questions from their own operations.

Organisations sending participants to this training will:

• Increase liquid revenue through better optimisation of recovery conditions against current product values
• Reduce energy consumption per unit of liquid recovered through improved understanding of plant heat integration
• Reduce unplanned shutdowns caused by freeze-up, hydrate formation and fouling in cryogenic units
• Improve product specification compliance and reduce off-specification product handling
• Strengthen technical review of recovery process selection and plant modification proposals
• Improve the ability to switch operating mode between ethane recovery and rejection in response to market conditions

Participants will:

• Understand the thermodynamic basis of every recovery process and its practical limits
• Evaluate plant recovery performance against what the configuration is capable of achieving
• Operate and troubleshoot fractionation columns against product specification
• Recognise and prevent the conditions that cause freeze-up and plugging in cryogenic service
• Contribute technically to recovery optimisation and plant modification decisions
• Build specialist gas processing capability applicable across processing and midstream operations

• Gas plant process and facilities engineers
• Operations engineers and supervisors in gas processing and NGL plants
• Design engineers working on gas processing and midstream facilities
• Production engineers responsible for gas handling and condensate recovery
• Technical and commercial staff evaluating NGL recovery economics
• Maintenance and reliability engineers supporting cryogenic and fractionation equipment
• Graduate and early-career engineers entering gas processing roles

Upon successful completion of this training course, delegates will be awarded an official Certificate of Completion issued by the Petroleum Engineers Association (PEA), an ISO 9001:2015 certified training organization. The certificate carries 10 Credits and formally records the total learning hours completed.

Each certificate is signed by the Course Facilitator and the CEO of the Petroleum Engineers Association, and serves as verifiable proof of professional training that delegates can present to employers and professional bodies worldwide.