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ASME Standard Stainless Seamless Serpentine Superheater Coil

ZHANGJIAGANG HUA DONG ENERGY TECHNOLOGY CO.,LTD
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ASME Standard Stainless Seamless Serpentine Superheater Coil

Brand Name : HDT

Model Number : Serpentine Tube

Certification : ASME, TUV, SGS, ABS, PED, ISO9001, Grade A

Place of Origin : China(Mainland)

MOQ : 500 tons

Price : 800 - 9000 USD / ton

Payment Terms : L/C, T/T, Western Union

Supply Ability : About 1000 ton / month

Delivery Time : 60-75days

Packaging Details : seaworthy packing for exporting

Material : Stainless steel, carbon steel, alloy steel

Certificate : ASME, TUV, SGS, CE, GRADE A, ISO9001

Shape : U Bend , Straight ,Coil, Snake Tube

Application : boiler&heat exchanger, energy, petrochemical, nuclear

OD : 1.5 to 1500mm

Finishing : Annealed, beveling

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ASME Standard Stainless Seamless Serpentine Tube Superheater Coil


Serpentine Tube Introduction


Serpentine Tube are widely used in Heat Exchanger Systems.


The function of the superheater tube is to absorb heat. The seamless boiler steel tube or heat-resistant alloy steel tube is bent into a snake shape, and both ends are welded to the inlet and outlet containers respectively.


Specific requirements are:


1. Superheater and steam pipe metals are required to have sufficiently high creep strength, durable strength and durable plasticity.In the calculation of superheater tube strength, the high temperature endurance strength limit is the main basis, and then the creep limit is used to check.When the metal of superheater tube is of high lasting strength, on the one hand, it can guarantee the safe operation under creep condition, on the other hand, it can avoid the difficulty in processing and operation caused by too thick tube wall.

2. It is required that the metal of superheater tube has good stability in microstructure and properties during long-term operation at high temperature.

3. Good process performance is required, especially the welding performance is good.The superheater tube is also required to have good cold working performance.

4. High oxidation resistance of steel is required.It is generally required that the superheater tube metal be oxidized to a depth of less than 0.1 mm/year at operating temperature (i.e. tube wall temperature).


Superheaters and reheaters are important parts for the heating surfaces, used to increase steam temperature, aiming to improve steam enthalpy and further to increase the thermal circulation efficiency for power station.


Superheaters work to heat surnatured steam to superheated steam with a certain tempetature. When boiler loads or other working conditions change, it is necessary to make sure superheated steam temperature to be normal, and within allowable range of temperature variation.


From the thermal circulation in power station, the original parameters of pressure and temperature is higher, the thermal efficiency of circulation is better, or the steam humidity of the steam turbine rear is too high, influencing its safety. While the superheaer steam temperature is limited by metal materials, at present, due to limitation of metal materials, superheated temperature for most power station boilers are still within the range of 540-555 dgrees, and to avoid the steam humidity of blade of steam turbine rear too big, thus middle reheating system is applied.


The Serpentine Tube Comply With The Following Standards:

1. ASTM A688/ASME SA688

2. ASTM A803/ASME SA803

3. ASTM A556/ASME SA556


Steel Grade:



FerriteAusteniteDuplexSuper DuplexNi-AlloysTitanium

TP410

TP405

S44400

S44660

TP430

TP304/304L

TP316/316L

TP316Ti

TP317/317L

TP321

TP347

S31803

S32205

S32304

S32750

S32760

N06600

N08020

N00880

N08825

N08904

Gr.2

Tube Of Other Alloys And Steel Grades Can Be Produced Upon Agreement.


Some of the quality tests carried out by us includes:


Corrosion TestConducted only when specially requested by the client
Chemical AnalysisTest done as per required quality standards
Destructive / Mechanical TestingTensile | Hardness | Flattening | Flare | Flange
Reverse-bend and Re. flat testsCarried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end
Eddy Current TestingDone to detect homogeneities in subsurface by using Digital Flaw-mark Testing System
Hydrostatic Testing100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s .
Air Under Pressure TestTo check any evidence of air leakage
Visual InspectionAfter passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections


Supplementary Testing : Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing. The tests conducted under this include:

· Eddy Current Testing

· O.P Testing

· Radiography Testing

· Corrosion Testing

· Micro Testing

· Macro Testing

· IGC Testing

· Ultrasonic testing

· Liquid Penetrate testing




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