Storage Section / Feedwater Tank for Deaerator Systems

Product Specifications

Technical details and manufacturing context for Storage Section / Feedwater Tank

Definition

The Storage Section/Feedwater Tank is an integral component of a deaerator system. It serves as a reservoir for the deaerated, oxygen-free feedwater after it has passed through the deaeration section. This tank maintains a sufficient volume of treated water to ensure a steady, uninterrupted supply to the boiler feed pumps, helping to buffer against fluctuations in demand and providing a final stage for any residual gases to separate. The tank is typically constructed from carbon steel for standard applications, with stainless steel available for corrosive feedwater environments. Key design parameters include a nominal capacity ranging from 5 to 100 cubic meters, an operating pressure of 0.1 to 0.5 MPa, and a design temperature of 104 to 150 degrees Celsius, corresponding to saturation temperature at operating pressure. The shell material is commonly Q245R per GB/T 713, with wall thickness from 6 to 20 mm as per GB/T 150. The tank includes insulation of 50 to 100 mm thickness to reduce heat loss, and water level control accuracy of ±10 mm to prevent pump cavitation. Inlet and outlet diameters range from DN50 to DN300, and the overall footprint varies from 3000×2000×2500 to 10000×4000×5000 mm. Corrosion allowance is 1 to 3 mm, and hydraulic test pressure is 1.25 to 1.5 times the design pressure. The weight ranges from 2000 to 20000 kg. These values are reference ranges and must be verified with the manufacturer for specific models. The tank operates by receiving deaerated water from the spray or tray section, maintaining pressure and temperature to prevent gas re-dissolution, and providing residence time for gas bubbles to escape. Water is drawn from the bottom by feed pumps. Proper selection requires consideration of boiler feedwater demand, reserve time, and site layout. Verification of compliance with standards such as GB/T 150 and GB/T 713 is essential. Maintenance signals include pressure drops, water level fluctuations, and corrosion indications. Failure boundaries include overpressure, thermal stress, and corrosion, which must be managed through regular inspection and adherence to design limits.

Working Principle

Deaerated water from the spray or tray section flows into the storage tank. The tank is typically maintained at a specific pressure and temperature (slightly above atmospheric boiling point) to prevent re-dissolution of gases. The large volume allows for thermal storage and provides residence time for any minute gas bubbles to rise to the surface and be vented. Water is drawn from the bottom of the tank by feed pumps for delivery to the boiler.

Common Materials

Carbon Steel, Stainless Steel (for corrosive feedwater)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Nominal Capacity	5–100 m³	Select based on boiler feedwater demand and reserve time.
Operating Pressure	0.1–0.5 MPa	Typical for deaerator storage sections; higher pressures require special design.GB/T 150
Design Temperature	104–150 °C	Corresponds to saturation temperature at operating pressure.GB/T 150
Shell Material	Q245R	Carbon steel for standard applications; stainless steel for corrosive environments.GB/T 713
Wall Thickness	6–20 mm	Determined by pressure and diameter.GB/T 150
Water Level Control Accuracy	±10 mm	Maintains stable water level to prevent pump cavitation.
Insulation Thickness	50–100 mm	Reduces heat loss and maintains water temperature.GB/T 4272
Weight	2000–20000 kg	Varies with capacity and material.
Footprint (L×W×H)	3000×2000×2500–10000×4000×5000 mm	Customizable based on site layout.
Inlet/Outlet Diameter	DN50–DN300 mm	Matches piping system requirements.GB/T 9119
Corrosion Allowance	1–3 mm	Accounts for material loss over design life.GB/T 150
Hydraulic Test Pressure	1.25–1.5 MPa	Ensures shell integrity before commissioning.GB/T 150

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

Shell
The main pressure-retaining cylindrical body of the tank.

Material: Carbon Steel or Stainless Steel
Heads (Dished Ends) Part
The curved end closures of the cylindrical shell.

Material: Carbon Steel or Stainless Steel
Inlet Nozzle Part
Connection point for receiving deaerated water from the deaeration section.

Material: Carbon Steel or Stainless Steel
Outlet Nozzle Part
Connection point at the bottom for feedwater discharge to the boiler feed pumps.

Material: Carbon Steel or Stainless Steel
Manway
Access hatch for internal inspection and maintenance.

Material: Carbon Steel or Stainless Steel
Level Gauge Connection Part
Nozzle for installing level indication devices (sight glass, transmitter).

Material: Carbon Steel or Stainless Steel
Vent Connection Part
Nozzle for connecting a vent line to release any accumulated non-condensable gases.

Material: Carbon Steel or Stainless Steel
Support Legs/Skirt Part
Structural supports to hold the tank in its installed position.

Material: Carbon Steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Storage Section / Feedwater Tank.

Applied To / Applications

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

Deaerator

View system integration details

Manufacturers of Storage Section / Feedwater Tank

Manufacturer profiles associated with Storage Section / Feedwater Tank.

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Frequently Asked Questions

What is the primary function of the storage section in a deaerator?

The storage section holds deaerated, oxygen-free feedwater after it leaves the deaeration section. It maintains a sufficient volume to ensure a steady supply to boiler feed pumps, buffers against demand fluctuations, and allows residual gas bubbles to separate.

What materials are commonly used for the storage tank?

Carbon steel is standard for most applications. Stainless steel is used when feedwater is corrosive. The shell material is often Q245R per GB/T 713, but this must be confirmed for the specific model.

What are typical operating pressure and temperature ranges?

Operating pressure is typically 0.1 to 0.5 MPa, and design temperature is 104 to 150 °C, corresponding to saturation temperature at operating pressure. These values are reference ranges and must be verified with the manufacturer.

How is water level controlled to prevent pump cavitation?

Water level control accuracy is typically ±10 mm. This maintains a stable water level, ensuring that feed pumps do not experience cavitation due to low suction head. The control system must be calibrated and maintained.

Data Basis

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

Preliminary Technical Classification

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pressure:	0-10 bar (0-145 psi) typical, up to 15 bar (218 psi) for pressurized designs
flow rate:	10-500 m³/h (44-2200 gpm) depending on tank capacity and system demand
temperature:	105-120°C (221-248°F) typical, up to 150°C (302°F) for high-pressure systems
slurry concentration:	Not applicable - designed for clean, deaerated water only

Storage Section / Feedwater Tank

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

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