Steam Drum – Boiler & Steam Pressure Vessels

Critical Component for Steam Generation and System Efficiency

Steam Drum - Boiler Pressure Vessel

Introduction

A Steam Drum is a key pressure vessel in water-tube and industrial boilers, designed to separate steam from water, regulate water levels, and ensure safe and efficient steam generation. Steam drums are essential for high-pressure and high-temperature applications in power plants, chemical industries, process industries, and district heating systems.

At NORDSTONE., we design and manufacture high-quality, ASME-certified steam drums with robust construction, precision engineering, and compliance with global standards, including ASME Section I & VIII, NB, and PED certification.

What is a Steam Drum?

A steam drum is a horizontal or vertical pressure vessel located at the top of a water-tube boiler. It acts as a reservoir and separator for the boiler system, ensuring that only dry steam exits to the superheater or process system while water is recirculated to the tubes.

Key components include:

  • Pressure vessel shell designed to withstand high pressure
  • Steam outlet nozzle for saturated or superheated steam
  • Water inlet from riser tubes
  • Internal baffles and cyclones for effective steam-water separation
  • Safety valves and pressure relief connections
  • Manways for inspection and maintenance
  • Level instrumentation ports for precise water monitoring

Steam drums are crucial for stable boiler operation, efficient steam production, and protection of downstream equipment.

Types of Steam Drums

Standard Water-Tube Steam Drum

  • Designed for high-pressure industrial boilers
  • Separates saturated steam from boiler water
  • Supports efficient water circulation and tube feed

High-Pressure Steam Drum

  • Engineered for pressures up to 150 bar or more
  • Suitable for thermal power plants, large industrial boilers

Vertical / Horizontal Steam Drum

  • Vertical design for compact footprint in process plants
  • Horizontal design for large-capacity, high-volume boilers

Superheated Steam Drum

  • Supports steam superheating systems
  • Ensures separation of water droplets before entering superheater

Custom Industrial Steam Drum

  • Tailored for specific pressure, temperature, and flow requirements
  • Optimized for internal baffles, cyclones, and inlet/outlet arrangements

Key Features of Steam Drums

Steam-Water Separation

  • Ensures only dry steam exits to superheaters or process systems
  • Reduces risk of water carryover and turbine blade erosion
  • Maintains precise water levels for safe boiler operation

High-Pressure & High-Temperature Capability

  • Design pressures: 10 to 150 bar (customizable)
  • Steam temperatures: 180°C to 550°C
  • Compatible with saturated and superheated steam systems

Robust Mechanical Design

  • ASME Section I & VIII certified
  • PED, NB, and international code compliance
  • Cylindrical shell with end caps or dished heads
  • Reinforced nozzles, manways, and lifting lugs

Material Selection

  • Carbon Steel – SA516 Gr.60/70, SA387 Gr.11/22
  • Stainless Steel – SS304/304L, SS316/316L
  • Alloy steels – SA213, SA335, high-performance alloys
  • Corrosion-resistant coatings and internal linings for water treatment

Safety & Reliability

Safety Features:
  • Safety valves and pressure relief devices
  • Water level instrumentation and alarms
  • Emergency shutdown systems
Testing & Certification:
  • Hydrostatic and pneumatic testing for vessel integrity
  • ASME U-stamp and NB certification available
  • Third-party inspection (TPI) support

Design & Engineering Considerations

Process Design

  • Steam generation and separation efficiency calculations
  • Boiler water circulation analysis
  • Water level and pressure control design
  • Feedwater inlet configuration for uniform distribution

Mechanical Design

  • Pressure vessel design per ASME Section I & VIII
  • Wind, seismic, and thermal load analysis
  • Reinforcement of nozzles, manways, and internal components
  • Compliance with PED, NB, and international codes

Operational Parameters

  • Design Pressure: 10 to 150 bar (customizable)
  • Steam Temperature: 180°C to 550°C
  • Diameter: 0.5 m to 4 m (project-specific)
  • Length/Height: 2 m to 12 m
  • Volume: 500 L to 50,000 L (customizable)

Applications

Power Generation
  • • Steam supply to turbines
  • • Combined heat & power (CHP) systems
  • • High-efficiency power plants
Industrial Process
  • • Chemical & pharmaceutical
  • • Food processing
  • • Petrochemical industries
  • • Sterilization, heating, drying
Commercial & Utility
  • • Hospitals & hotels
  • • District heating networks
  • • Centralized steam supply

Quality Assurance & Testing

All steam drums undergo rigorous QA/QC procedures:

Non-Destructive Testing
  • Ultrasonic testing (UT) for weld and shell thickness
  • Radiographic testing (RT) for weld integrity
  • Dye penetrant & magnetic particle inspection
Pressure Testing
  • Hydrostatic testing
  • Pneumatic testing
Certification & Documentation
  • Material traceability (MTC – EN 10204 3.1)
  • ASME U-stamp and NB certification
  • Third-party inspection (TUV, BV, Lloyds, DNV, SGS)

Optional Features & Packages

  • Vertical or horizontal configurations
  • Cyclone separators and internal baffles for enhanced steam dryness
  • Pressure and water level instrumentation
  • Insulation and cladding for thermal efficiency
  • Skid-mounted or modular drum integration
  • Custom nozzle arrangement and manways

Why Choose NORDSTONE.?

  • 20+ years of expertise in boiler and steam pressure vessels
  • Advanced thermal and mechanical design capabilities
  • ASME-certified fabrication for global compliance
  • Custom-engineered steam drums for industrial, commercial, and power applications
  • Full QA/QC, documentation, and third-party inspection support
  • Proven reliability in high-pressure and high-temperature systems
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