20 Design Consultancy Services for TEG Flash Separators

1. Process design and simulation (Aspen HYSYS, ProMax)

2. Phase separation modeling and flash calculations

3. Mechanical design (ASME Section VIII)

4. Mist eliminator sizing and specification

5. Fabrication drawing and 3D modeling

6. Material selection (TEG, hydrocarbons, H₂S)

7. Instrumentation and control integration

8. Civil and foundation load planning

9. Vapor recovery system design

10. Interface engineering with TEG reboiler

11. SCADA/PLC system integration

12. Inspection and testing planning (NDT, FAT)

13. HAZOP study participation

14. Skid package design and layout

15. Performance monitoring and optimization

16. Glycol loss control audits

17. Commissioning and startup support

18. Retrofit of older TEG flash vessels

19. Safety system design (PSV, relief headers)

20. Environmental compliance consulting (VOC control)

 

 1. TEG Flash Separator: Overview

A TEG Flash Separator is a vessel used in the natural gas dehydration process to separate hydrocarbon gases and entrained light hydrocarbons from rich glycol (TEG) before it enters the regeneration system. It prevents hydrocarbon flashing, foaming, and safety hazards during glycol reboiler heating.

🟩 2. Engineering Design Topics

🔹 a. Piping

• Inlet from TEG contactor or absorber

• Vapor outlet to flare, vapor recovery, or fuel gas system

• Liquid TEG outlet to filters or surge tank

• Drain and vent lines

• Relief valve connections

• Optional bypass line for offline operation

🔹 b. Civil Foundation

• Small vertical vessel skid or pad-mounted

• Concrete base with anchor bolts

• Bund wall (for glycol spill containment)

• Grounding for electrostatic discharge

• Accessible maintenance platform (optional)

🔹 c. Pumps

• Not usually mounted on the separator, but works with:

  • TEG circulation pump (after flash separator)

  • Flash gas compressor (optional)

  • Drain or sump pump (if installed with tankage)

🔹 d. P&ID Elements

• Rich TEG inlet

• Flash vapor outlet (with check valve)

• TEG outlet to filtration or reboiler

• Pressure control valve (PCV)

• Level controller and dump valve

• Emergency vent/PSV

• Temperature and pressure instruments

🔹 e. Instrumentation

• Level transmitter (LT) or sight glass

• Pressure transmitter (PT)

• Temperature element (TE)

• Level control valve (LCV)

• Differential pressure indicator across mesh pad (if present)

• Interface with reboiler controls

🔹 f. Related Equipment

• Glycol reboiler (downstream)

• Glycol filters (particulate and carbon)

• TEG surge tank

• Flash gas compressor or flare

• TEG regeneration package

🟩 3. Process Design Considerations

• Flash gas removal efficiency

• Hydrocarbon vapor pressure at inlet temperature

• Operating pressure: ~75–250 psig

• TEG vapor loss minimization

• Retention time (2–5 min typical)

• Phase separation using gravity and mist extractor

• Material compatibility with TEG and hydrocarbons

🟩 4. Mechanical Design Considerations

• ASME Section VIII Div. 1 compliance

• Vertical pressure vessel design

• Design pressure: ~250 psig

• Design temperature: up to 150°C

• Internal components: mesh pad/mist eliminator

• Corrosion allowance and internal coating (epoxy, optional)

• TEG-compatible metallurgy (CS, SS316, or lined carbon steel)

🟩 5. 20 Example TEG Flash Separator Equipment Names

1. TEG-Flash V100 – Standard vertical design

2. FlashTrap-CS – Carbon steel unit

3. PureGly Sep-250 – 250 psi rating

4. DryGas FlashX – Gas dehydration flash separator

5. GlyStrip-VR – Vapor recovery flash separator

6. ZeroLoss-TFS – Minimizes glycol vapor loss

7. MegaFlash-Gly300 – For high flow rates

8. SafePhase-VT – Vapor-tight TEG separator

9. GlyClear SepLite – Compact flash unit

10. ProGly FlashGuard – With PSV integration

11. CondTrap Flash150 – Low-pressure unit

12. TEG-VentSafe – Vented to flare or fuel

13. GlyPhase-SC – With mist eliminator

14. EcoDry Flash-XT – Environmentally optimized

15. TEGFlow FlashMax – High flow glycol flash tank

16. GlyGuard 1000 – For high CO₂ content gas

17. DryPhase VFS – Skid-mounted system

18. GlyDefend-FS – Flash separator with filtering

19. HydroStrip TEG 200 – Hydrocarbon stripping focus

20. TEGNet MiniFlash – Compact unit for small dehydrators

20 Applications of TEG Flash Separators

1. Natural gas dehydration systems

2. Onshore gas gathering stations

3. Offshore gas platforms

4. Fuel gas treatment units

5. Small skid-based gas dehydration units

6. Midstream gas processing

7. Sweet and sour gas dehydration

8. Associated gas treatment from oil wells

9. CNG plant gas drying

10. Flash vapor recovery systems

11. Low-pressure glycol circulation systems

12. Amine/glycol combined systems

13. Remote well pads with TEG units

14. LPG recovery front-end systems

15. Flare minimization projects

16. Temporary or trailer-based dehydration units

17. Flash vapor as fuel gas recovery

18. Glycol loss reduction systems

19. Glycol reclamation projects

20. LNG pre-treatment dehydration stages