Seamless Serpentine Tube Superheater Coil For Pressure Parts ASME
Serpentine Tube Introduction
Serpentine Tube are widely used in Heat Exchanger Systems.
Hua Dong Energy Technology Started to Produce Serpentine Tube Since
1985,Up to now already supply more than 300,000 tons Steel
Serpentine Tube to over 30 countries.
Hua Dong Energy Technology deals with Austenitic Stainless Steel,
Nickel Alloy Steel (Hastelloy , Monel, Inconel, Incoloy ) seamless
and welded pipe and tube already more than 35 years, every year
sell more than 50000 tons of steel pipe and tube. Our client
already cover more than 45 countries, Like Italy, UK, Gernmany,
USA, Canada, Chile, Colombia, Saudi Arabia, Russia, Korea,
Singapore, Austrial, Poland, France , ....And our group branch
company and factory have been already approved by :ABS, DNV, GL,
BV, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9001,
Straight Tubes Standard Specification For Bending:
ASME SA 213; ASME SB 163; ASME A789, ASME SA268, ASME SA269, etc.
Marking: Before Bending By Marking Machine All Over The Tube Length (Bent
Section After Heat Treatment Without Marking)
Note: Marking is also possible After Bending On The Straight Parts
Of U-Bending Tube.
-TEMA RCB 2.31 Standard Of The Tubular Exchanger Manufacturers
Association (9th Edition).
-ASTM A688/ASME SA688 Standard Specification For Welded Tubes Of
Austenitic Corrosion Resistant Steel Grade Designed For Feed Water
-ASTM B163/ASME SA163 Standard Techinical Requirements For Tubes Of
Nickel And Nickel Alloy For Condensers And Heat Exchangers.
Bending Radius: From 1.5*OD(Outside Diameter) To 1500mm
When Ordering Tubes With Radius less or equal to 1.5*OD, It Is
Necessary To Agree Precision Of Geometrics.
Straight Tubes Maximum Length:(Before Bending): 35000 mm.
Leg Length: Min 1 Meter, Max. 16500 mm (For Max R=1500mm)
Note: Other Size Are Available Upon Agreement.
Heat Treatment: Stress Relieved After U-Bending (Bending Area Plus
300MM For Each Leg).
Hydrostatic Test After U Bending: Maximum Test Pressure 600 Bar,
Soaking 10 Sec. With
Dematerialized Water. Compressed Air Cleaning After Hydro-Test.
Packaging: In Strong Transport-Worthy Pre-fumigated wooden boxes of
corresponding dimensions for
each tube Length, Radius, Diameter, According To PO requirements as
well as wrapped In polyethylene
films With soft plastic caps on both end of Tube.
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
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
The Serpentine Tube Comply With The Following Standards:
1. ASTM A688/ASME SA688
2. ASTM A803/ASME SA803
3. ASTM A556/ASME SA556
Tube Of Other Alloys And Steel Grades Can Be Produced Upon
Some of the quality tests carried out by us includes:
|Corrosion Test||Conducted only when specially requested by the client|
|Chemical Analysis||Test done as per required quality standards|
|Destructive / Mechanical Testing||Tensile | Hardness | Flattening | Flare | Flange|
|Reverse-bend and Re. flat tests||Carried 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 Testing||Done to detect homogeneities in subsurface by using Digital
Flaw-mark Testing System|
|Hydrostatic Testing||100% Hydrostatic Testing carried out according to ASTM-A 450 norms
for checking tube leakage, and biggest pressure we can support
|Air Under Pressure Test||To check any evidence of air leakage|
|Visual Inspection||After 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