We offer stainless steel feedwater heater tube with many grades, tube is manufactured in various sizes and dimensions, and stainless steel materials have good properties and corrosion resistance to stand high pressure in the feedwater heater system.
Welded and seamless stainless steel tubes are commonly selected for feedwater heaters, the two types of tubes have advantages and disadvantages, heater manufacturers and designers should opt proper tube, these tubes are used in thermal power plants and also in nuclear power stations.
Stainless Steel Feedwater Heater Tube Specifications
| Specifications | ASTM A249, A269, A688, A803 |
|---|---|
| Tube Form | Straight Tube, U Bend Tube |
| Grade | Austenitic Stainless Steels Ferritic Stainless Steels Duplex Steel |
| Finishes | Annealing Pickling Bright Annealing |
| Outside Diameter | 15.88, 19.05, 25.4, 31.8, 38.1 Mm |
| Thickness | 0.71, 0.89, 1.0, 1.2, 1.65 Mm |
| Applications | Heat Exchanger, Boiler, Condenser |
Stainless Steel Feedwater Heater Tube Specifications
ASTM/ASME specifications specify feedwater heater tubes requirements, including A249, A268, A688, and A803, These specifications were developed for general heat exchanger, condenser and boiler tubes, and provide basic and additional requirements for high-quality tubes,
Compared to A249/A268 specifications, A688/A803 specify additional conditions and testing requirements, for quality feedwater heater tubing, A688/A803 standard is a good option to meet additional requirements.
ASTM A268 / A268M
Seamless and Welded Ferritic and Martensitic Stainless Steel Tubing for General Service
ASTM A249 / A249M
Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
ASTM A688 / A688M
Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes
ASTM A803 / A803M
Seamless and Welded Ferritic Stainless Steel Feedwater Heater Tubes
Common Stainless Steel Grade For Feedwater Heater Tube
| Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|---|
| TP 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.0 | 8-11 | 18-20 | |
| TP 304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.0 | 8-13 | 18-20 | |
| TP 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.0 | 10-14 | 16-18 | 2-3 |
| 2205 | 0.03 | 2.00 | 0.03 | 0.02 | 1.0 | 4.5-6.5 | 22-23 | 3.0-3.5 |
| TP 439 | 0.03 | 1.00 | 0.040 | 0.030 | 1.0 | 0.5 | 17-19 | |
| TP 446 | 0.02 | 1.5 | 0.040 | 0.030 | 1.0 | 0.75 | 23-27 |
Welded And Cold Drawn Stainless Steel Tube
With the improvement of technology in welded tube manufacturing, more and more projects require welded tubes for feedwater heater systems, compared to seamless tubes, welded tubes have several advantages, like cost-effectiveness, short delivery time, tight tolerances and so on.
TIG (tungsten inert gas) welded process is the most commonly used for welded stainless steel tubing, the TIG welding method provides high-quality tubes for the heater, and enables welding bead and base metal integrity perfectly..
Feedwater heater tubes should be annealed as per specifications, we have in-line heat treatment equipment, which improves performance in both the mechanical properties and corrosion resistance.
U Bend Tube
Stainless steel U bending tube is manufactured intended for heat exchanger, condenser, feedwater heater system, U bend tube has max length of up to 30 meters, and the bending part should be heat treated to remove residual stress, ensure all the parts of the U bend tube the same quality.
Inspection And Testing
- Tensile test
- Flattening test
- Flaring test
- Flange test
- Impact test
- Hardness test
- Eddy Current testing
- Positive Material Identification (PMI)
- Ultra Sonic Testing
- Hydrostatic testing
- Bent portion wall thickness checking