Editorial Technical Reference

Storage Section / Feedwater Tank

This page explains how Storage Section / Feedwater Tank is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

The storage section of a deaerator that holds treated feedwater before distribution to boilers.

View Full Specifications Explore Manufacturing Sources

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
ParameterTypical rangeNotes & selection driver
Nominal Capacity5–100 m³Select based on boiler feedwater demand and reserve time.
Operating Pressure0.1–0.5 MPaTypical for deaerator storage sections; higher pressures require special design.GB/T 150
Design Temperature104–150 °CCorresponds to saturation temperature at operating pressure.GB/T 150
Shell MaterialQ245RCarbon steel for standard applications; stainless steel for corrosive environments.GB/T 713
Wall Thickness6–20 mmDetermined by pressure and diameter.GB/T 150
Water Level Control Accuracy±10 mmMaintains stable water level to prevent pump cavitation.
Insulation Thickness50–100 mmReduces heat loss and maintains water temperature.GB/T 4272
Weight2000–20000 kgVaries with capacity and material.
Footprint (L×W×H)3000×2000×2500–10000×4000×5000 mmCustomizable based on site layout.
Inlet/Outlet DiameterDN50–DN300 mmMatches piping system requirements.GB/T 9119
Corrosion Allowance1–3 mmAccounts for material loss over design life.GB/T 150
Hydraulic Test Pressure1.25–1.5 MPaEnsures 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

Application & selection

Application Fit & Sizing Matrix

Operational Limits
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
Media Compatibility
✓ Deaerated boiler feedwater ✓ Condensate return ✓ Chemically treated demineralized water
Unsuitable: Corrosive fluids (acids, chlorides) or abrasive slurries
Sizing Data Required
  • Maximum system flow rate (m³/h or gpm)
  • Required storage capacity (minutes of system demand)
  • Operating pressure and temperature requirements

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion and pitting
Cause: Dissolved oxygen in feedwater reacting with tank metal, accelerated by improper chemical treatment or stagnant water conditions.
Cavitation damage at pump suction
Cause: Insufficient net positive suction head (NPSH) due to low water level, high temperature, or pump oversizing causing vapor bubble formation and collapse.
Maintenance Indicators
  • Visible rust streaks or weeping at tank seams/welds indicating active corrosion
  • Unusual pump noise (cracking/popping sounds) from cavitation or fluctuating level gauge readings
Engineering Tips
  • Implement continuous oxygen scavenging and pH control with automated chemical injection, plus regular internal inspections for coating integrity
  • Maintain minimum water level above pump suction per NPSH requirements, install vortex breakers, and verify pump curves match system demand

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASME BPVC Section VIII - Rules for Construction of Pressure Vessels EN 13445 - Unfired Pressure Vessels

Quoted from the published standard.

Manufacturing Precision
  • Wall Thickness: +/-0.5mm
  • Nozzle Alignment: +/-1.5mm
Quality Inspection
  • Hydrostatic Pressure Test
  • Ultrasonic Thickness Testing
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Storage Section / Feedwater Tank

Manufacturer profiles associated with Storage Section / Feedwater Tank.

Sourcing Storage Section / Feedwater Tank from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Buyer enquiry

Request manufacturing insight for Storage Section / Feedwater Tank

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What to include
Share your product specifications, quantity, destination and target delivery date.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at [email protected].

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. See the editorial policy.

Related equipment

Applied To / Applications

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

Deaerator
View system integration details

Industrial Ecosystem & Supply Chain Structure

Downstream Applications

Industry Taxonomies & Aliases

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

storage section feedwater tank

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

Need to Manufacture Storage Section / Feedwater Tank?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
Z-axis Ram/Spindle
Last Product
Get QuotesChat