Degasser Vessel (Process Pressure Vessel)

Degasser Vessel (Process Pressure Vessel)

Introduction

A Degasser Vessel—also known as a Deaerator, Gas Knockout Vessel, or Liquid Degasser—is engineered to remove dissolved gases, entrained air, volatile compounds, and harmful vapors from liquid streams. This ensures process stability, prevents corrosion, protects downstream equipment, and improves operational efficiency across oil & gas, chemical, power, and industrial applications.

Product Overview

Degasser vessels utilize advanced mechanisms such as vacuum degassing, pressure differential separation, spray/tray degassing, centrifugal action, and steam stripping. These systems effectively remove dissolved gases like O₂, CO₂, H₂S, methane, nitrogen, and volatile hydrocarbons to maintain safe and stable liquid flow.

Technical Features

1) Design & Construction Features:
  • Design Codes: ASME Sec VIII Div.1, API 12J, PED 2014/68/EU, IS 2825, NACE MR0175/ISO 15156
  • Design Pressure: 0.5 bar to 80 bar
  • Design Temperature: –20°C to 350°C
  • Liquid Flow Rate: 1 m³/hr to 2000+ m³/hr
  • Gas Removal Efficiency: 95% to 99.9% (based on type)
  • Vacuum Level (Vacuum Degasser): up to –700 mmHg
  • Material Grades:
    • Carbon Steel: SA 516 Gr.60/70, IS 2062 E250/E350
    • Stainless Steel: SS304/304L, SS316/316L, Duplex 2205, Super Duplex 2507
    • Special Alloys: Inconel, Hastelloy, Alloy 20
    • Rubber-lined / Epoxy-lined options for corrosive fluids
2) Types of Degasser Vessels:
  • Atmospheric Degasser: Removes entrapped gases in drilling mud & water treatment.
  • Vacuum Degasser: High-efficiency removal of dissolved gases using vacuum technology.
  • Pressure Degasser: For pressurized systems requiring controlled degasification.
  • Chemical Degasser / Deaerator: Removes O₂ & CO₂ using steam or chemical scavengers.
  • Flash Degasser: Removes gas by pressure-drop-induced flashing.
  • Electrostatic Degasser: Used in refinery crude desalting units.
  • High-Temperature Degasser: Used in boilers & turbine feedwater systems.
3) Internal Components:
  • Spray Nozzles / Distributor for enhanced separation
  • Trays / Packed Beds for high-efficiency disengagement
  • Baffle Plates for smooth flow distribution
  • Vacuum Pump System (vacuum degassers)
  • Mechanical Separator / Rotary Impeller (mud degassers)
  • Demister Pads for liquid carryover control
  • Weir Plates & sump for smooth liquid extraction
  • Steam Injection Device (steam deaerators)
4) External Fittings & Nozzles:
  • Liquid inlet / outlet
  • Vent gas outlet
  • Drain & flush nozzles
  • Pressure Safety Valve (PSV)
  • Pressure & temperature gauge ports
  • Level gauge, switches & transmitters
  • Vacuum gauge & pump connection (vacuum type)
  • Manholes / handholes for maintenance
5) Surface Preparation & Coating:
  • Internal Coatings: Food-grade epoxy, phenolic epoxy, rubber lining, glass flake epoxy
  • External Coatings: PU topcoat, epoxy primer + finish, hot-dip galvanizing, offshore-grade coatings
Functional Advantages:
  • Corrosion Prevention

    Removes harmful gases like O₂ & CO₂ that accelerate corrosion in pipelines & equipment.

  • Pump Protection

    Prevents cavitation & instability in centrifugal pumps.

  • Foaming Reduction

    Reduces foam formation in drilling & refining systems.

  • Process Stability

    Improves efficiency of heaters, boilers, reactors & separators.

Optional Packages:
  • Skid-mounted degasser system with pumps, instruments, and valves
  • PLC/SCADA control panel integration
  • Flame arrestor on vent line
  • Explosion-proof motor (for rotary degasser)
  • Custom piping & manifold assemblies
Quality Assurance:

Each degasser vessel undergoes:

  • Hydrostatic or pneumatic pressure testing
  • NDT: RT, UT, PT, MPI
  • Vacuum leak testing (vacuum degasser)
  • Dimensional & weld quality inspection
  • Third-party inspection (TUV, Lloyds, BV, DNV, SGS)

Industries Served

  • Oil & Gas (Drilling & Production)
  • Refineries & Petrochemical Plants
  • Power Plants (Boiler Feedwater)
  • Chemical & Fertilizer Industries
  • Water Treatment & Desalination
  • Mining & Minerals Processing
  • Pharma & Food Processing

Why Choose Our Degasser Vessels?

  • 20+ years of pressure vessel expertise
  • High-efficiency gas removal tailored to process needs
  • Compliance with ASME, API, PED, & NACE
  • Designed for long life & minimal maintenance
  • Proven performance in harsh & corrosive environments
Scrubber Vessel Shell & Tube Heat Exchanger
Ready to Discuss Your Degasser Vessel Requirements?

Contact our engineering team for custom solutions and quotations.

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