Membrane Water Wall Tubes for Boilers
Product Overview
Membrane Water Wall Tubes are welded tube-panel assemblies used as the primary heat-absorbing surface inside industrial and utility boilers. The construction consists of parallel boiler tubes joined by continuously welded steel membranes (flat bars), forming a gas-tight furnace enclosure capable of withstanding high temperatures and pressures.
Compared with refractory-lined furnace walls, membrane wall construction significantly improves thermal efficiency, reduces heat loss, minimizes air leakage, and enhances overall boiler reliability. These panels are widely used in coal-fired boilers, biomass boilers, waste-to-energy plants, HRSG units, circulating fluidized bed boilers, and petrochemical steam generators.
Our membrane water wall panels are manufactured in accordance with international standards and can be customized to suit new boiler fabrication projects or retrofit applications.
Features and Benefits
- Excellent heat transfer performance.
- Gas-tight furnace construction.
- Reduced refractory requirements and maintenance costs.
- High structural rigidity and dimensional stability.
- Superior resistance to thermal fatigue.
- Lower air infiltration and improved combustion efficiency.
- Suitable for high-pressure and high-temperature service.
- Factory-prefabricated panels reduce field installation time.
- Available in straight, bent, spiral, and customized configurations.
Typical Applications
- Utility power station boilers
- Biomass-fired boilers
- Waste heat recovery boilers
- Waste-to-energy incineration boilers
- Coal-fired steam generators
- Petrochemical process boilers
- Marine auxiliary boilers
- Circulating fluidized bed (CFB) boilers
- Industrial package boilers
Manufacturing Standards
Typical manufacturing standards include:
- ASME Section I
- ASME SA-192
- ASME SA-210
- ASME SA-213
- EN 12952
- EN 10216
- GB/T 5310
- ISO 9001 Quality Management System
Alternative material grades and specifications can be supplied upon request.
Common Size Range
Tube Dimensions
| Item |
Typical Range |
| Outside Diameter |
38 mm to 76.2 mm |
| Tube Wall Thickness |
4.0 mm to 10.0 mm |
| Tube Length |
Up to 25,000 mm |
| Tube Pitch |
50 mm to 120 mm |
| Panel Width |
Customized |
| Panel Height |
Customized |
Membrane (Flat Bar) Dimensions
| Item |
Typical Range |
| Membrane Thickness |
4 mm to 12 mm |
| Membrane Width |
15 mm to 40 mm |
| Welding Type |
Continuous Automatic Welding |
| Panel Configuration |
Straight or Bent |
Available Materials
Tube Materials
- ASME SA-192
- ASME SA-210 Grade A1/C
- ASME SA-213 T11
- ASME SA-213 T22
- ASME SA-213 T23
- ASME SA-213 T91
- 20G
- 15CrMoG
- 12Cr1MoVG
Membrane Materials
- Carbon Steel
- Alloy Steel
- Matching grade material according to design requirements
Chemical Composition (Typical)
ASME SA-192
| Element |
Composition (%) |
| Carbon (C) |
0.06–0.18 |
| Manganese (Mn) |
0.27–0.63 |
| Phosphorus (P) |
≤0.035 |
| Sulfur (S) |
≤0.035 |
| Silicon (Si) |
Not specified |
ASME SA-210 Grade A1
| Element |
Composition (%) |
| Carbon (C) |
≤0.27 |
| Manganese (Mn) |
≤0.93 |
| Phosphorus (P) |
≤0.035 |
| Sulfur (S) |
≤0.035 |
| Silicon (Si) |
≥0.10 |
ASME SA-213 T22
| Element |
Composition (%) |
| Carbon (C) |
0.05–0.15 |
| Chromium (Cr) |
1.90–2.60 |
| Molybdenum (Mo) |
0.87–1.13 |
| Manganese (Mn) |
0.30–0.60 |
| Silicon (Si) |
≤0.50 |
| Phosphorus (P) |
≤0.025 |
| Sulfur (S) |
≤0.025 |
Mechanical Properties (Typical)
ASME SA-192
| Property |
Value |
| Tensile Strength |
≥325 MPa |
| Yield Strength |
≥180 MPa |
| Elongation |
≥35% |
ASME SA-210 Grade A1
| Property |
Value |
| Tensile Strength |
≥415 MPa |
| Yield Strength |
≥255 MPa |
| Elongation |
≥30% |
ASME SA-213 T22
| Property |
Value |
| Tensile Strength |
≥415 MPa |
| Yield Strength |
≥205 MPa |
| Elongation |
≥30% |
Actual values are subject to the applicable material standard and heat treatment condition.
Manufacturing Process
Raw Material Inspection → Tube Cutting → Tube Straightening → Membrane Preparation → Automatic Membrane Welding → Panel Assembly → Dimensional Inspection → Heat Treatment (if required) → Non-Destructive Examination → Hydrostatic Testing → Surface Protection → Packing and Shipment.
Inspection and Testing
Each membrane water wall panel undergoes rigorous quality control procedures to ensure safe operation under demanding boiler conditions.
Dimensional Inspection
- Tube outside diameter verification
- Wall thickness measurement
- Tube pitch inspection
- Panel width and height checks
- Straightness verification
Material Verification
- Mill Test Certificate review
- Positive Material Identification (PMI) upon request
- Chemical composition analysis
Mechanical Testing
- Tensile testing
- Flattening test
- Flaring test
- Hardness testing
Non-Destructive Examination (NDE)
- Visual Inspection (VT)
- Magnetic Particle Testing (MT)
- Dye Penetrant Testing (PT)
- Ultrasonic Testing (UT)
- Radiographic Testing (RT) for critical welds
Pressure Testing
- Hydrostatic testing according to project specifications or applicable codes.
Documentation
Available documents include:
- EN 10204 Type 3.1 Material Certificate
- Inspection and Test Plan (ITP)
- NDE Reports
- Dimensional Inspection Reports
- Hydrostatic Test Reports
- Heat Treatment Records
- Packing List and Commercial Documentation
Why Choose Our Membrane Water Wall Tubes?
Our manufacturing team combines advanced automated welding technology with strict quality management to deliver durable, high-efficiency membrane wall panels for modern boiler systems. From standard industrial boilers to large utility power projects, we provide customized engineering support, comprehensive inspection documentation, and reliable global delivery.
Whether for new installations or replacement projects, our membrane water wall solutions help improve boiler efficiency, extend service life, and reduce maintenance costs.
