Steam Drum for Waste Heat Boilers | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Steam Drum

Definition

The steam drum is a critical component of a waste heat boiler system where it serves as a separator between steam and water phases. It receives the steam-water mixture from the boiler tubes, allows steam to separate and dry before being sent to the steam header, while returning water to the downcomers for recirculation. It also provides water storage capacity, chemical treatment injection points, and blowdown connections for maintaining water quality. The drum is typically constructed from carbon steel or low alloy steel, with internal components often made of stainless steel. Design parameters include a design pressure of 1.0–1.6 MPa (GB/T 16507), design temperature of 184–204 °C, inner diameter of 800–2000 mm, shell thickness of 16–60 mm, length of 3000–12000 mm, water capacity of 2–20 m³, material grades Q245R–Q345R (GB/T 713), corrosion allowance of 1.5–3 mm, weight of 5000–30000 kg, and 100% RT non-destructive testing (NB/T 47013). These values are reference ranges and must be confirmed for the specific model and application. The steam drum operates on the principle of gravity separation and centrifugal force. The steam-water mixture from the riser tubes enters the drum where the velocity decreases, allowing steam bubbles to rise due to density difference. Internal devices like cyclones, scrubbers, and dry pans further separate moisture from steam. Clean steam exits through the top connections, while water returns to the boiler circuit through downcomers. For procurement, verify the design pressure, temperature, and material grade against your boiler's operating conditions and applicable standards. Maintenance signals include corrosion, erosion, or weld cracking, which may require thickness measurements and non-destructive testing. Failure boundaries are defined by the design pressure and temperature limits; exceeding these can lead to catastrophic failure. Always consult the legal manufacturer or supplier for model-specific values and compliance.

Working Principle

The steam drum operates on the principle of gravity separation and centrifugal force. The steam-water mixture from the riser tubes enters the drum where the velocity decreases, allowing steam bubbles to rise due to density difference. Internal devices like cyclones, scrubbers, and dry pans further separate moisture from steam. Clean steam exits through the top connections, while water returns to the boiler circuit through downcomers.

Common Materials

Carbon Steel, Low Alloy Steel, Stainless Steel (internal components)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Design Pressure	1.0–1.6 MPa	Above 1.6 MPa requires thicker shell and higher costGB/T 16507
Design Temperature	184–204 °C	Corresponds to saturation temperature at design pressureGB/T 16507
Inner Diameter	800–2000 mm	Larger diameter increases steam separation space
Shell Thickness	16–60 mm	Determined by pressure, diameter, and material strengthGB/T 16507
Length	3000–12000 mm	Affects water capacity and steam disengagement
Water Capacity	2–20 m³	Provides thermal storage for stable operation
Material Grade	Q245R–Q345R	Carbon steel for high temperature strengthGB/T 713
Corrosion Allowance	1.5–3 mm	Compensates for material loss over service lifeGB/T 16507
Weight	5000–30000 kg	Affects foundation and lifting requirements
Non-Destructive Testing	100% RT	Full radiography for critical weldsNB/T 47013

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Drum Body
The drum shell itself: contains the process and carries the operating pressure.
Manhole
Provides access for inspection and maintenance

Material: Carbon Steel
Steam Outlet Nozzle Part
Connects to steam header for steam distribution

Material: Carbon Steel or Alloy Steel
Feedwater Inlet Part
Entry point for treated feedwater

Material: Carbon Steel
Downcomer Connections Part
Connects to downcomer pipes for water recirculation

Material: Carbon Steel
Internal Separators Part
Cyclones, scrubbers, or chevron dryers for steam-water separation

Material: Stainless Steel
Blowdown Connections Part
For removal of concentrated boiler water and sludge

Material: Carbon Steel
Chemical Injection Points Part
For adding water treatment chemicals

Material: Stainless Steel
Level Indicators
Sight glasses or level transmitters for water level monitoring

Material: Glass/Stainless Steel

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Waste Heat Boiler

View system integration details

Manufacturers of Steam Drum

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Frequently Asked Questions

What is the function of a steam drum in a waste heat boiler?

The steam drum separates steam from water, provides storage for feedwater, and facilitates chemical treatment and blowdown to maintain water quality.

What materials are commonly used for steam drums?

Carbon steel and low alloy steel are typical for the shell, with stainless steel for internal components. Material grades like Q245R–Q345R are referenced in GB/T 713.

What design parameters should be verified before purchasing?

Verify design pressure, temperature, inner diameter, shell thickness, length, water capacity, material grade, corrosion allowance, weight, and non-destructive testing requirements against your application.

How is the steam drum maintained?

Regular inspection for corrosion, erosion, and weld integrity is essential. Non-destructive testing such as radiography may be required. Always follow the manufacturer's guidelines.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 150 bar (standard), higher with custom design
flow rate:	10-500 m³/h (steam generation rate)
temperature:	150-350°C (typical), up to 450°C with special materials
slurry concentration:	Not applicable (clean steam/water separation only)

Steam Drum

Product Specifications

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Reliability & Engineering Risk Analysis

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