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In order to reduce the loss caused by the heat taken away by the cooling water in the condenser, feed water heating is used to reduce this loss, that is, after the high-pressure feed pump, high-pressure heater is added to improve the boiler feed water problem and economic benefit. Among them, the heat exchanger tube is an important core component, and the heat exchanger tube has a U-shaped tube. The U-shaped tubular heat exchanger is U-shaped without the heat exchange tube. Both ends are respectively fixed in the upper and lower areas of the same tubesheet, and are divided into inlet and outlet chambers with the help of the diaphragm in the tube compartment. The heat exchanger completely eliminates the thermal stress and has a simpler structure than the floating head type, but the inside of the steel pipe is not easy to clean.
The main grade of this U bend seamless steel tube
Type |
Typical grade |
Specification |
Seamless steel tube for boiler |
ASTM A178 Grade A |
ASTM A178/A178M |
ASTM A192 |
ASTM A192/A192M |
|
320 CFS,360, 440, 243, 620-460, 622-490, |
BS3059 |
|
P195TR1/TR2, P235TR1/TR2, P265TR1/TR2, |
EN10216 |
|
ST35.8, ST45.8 |
DIN 17175 |
|
ST37.0, ST44.0, ST50.0 |
DIN 1629 |
|
STPG370, STPG410 |
JIS G3454 |
|
STB340, STB410, STB440 |
JIS G3461 |
|
Tubes for heat exchangers and condensers |
ASTM A179 |
ASTM A179/A179M |
Alloy material tube |
T11, T12, T22, T5, T9 |
ASTM A213/A213M, |
P11, P12, P22, P5, P9ASTM A335/A335M |
|
|
T11, T22, T5 |
ASTM A199/A199M |
|
T1, T1a, T1b |
ASTM A209/A209M |
|
10CrMo5-5, 11CrMo9-10, X11CrMo5+1, TC1, TC2 |
EN10216-2 |
|
STBA 12, STBA13, STBA24 |
JIS G3462 |