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DELLOK Resistance Welding Studded Tube For Air Coolers

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Dellok Yonghui Radiating Pipe Manufacturing Co.,Ltd.

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DELLOK Resistance Welding Studded Tube For Air Coolers

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Brand Name :	Dellok Yonghui
Model Number :	Studded Tube
Certification :	ISO90001
Price :	$20 - 1000 /Piece/Pieces
Payment Terms :	L/C, D/A, D/P, T/T, Western Union, MoneyGram
Supply Ability :	10000 Piece/Pieces per Month
Delivery Time :	1-3 weeks

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Company Profile

DELLOK Resistance Welding Studded Tube For Air Coolers

^{DELLOK Resistance Welding Studded Tube For Air Coolers}

^{About Us}

^{DELLOK (YONGHUI RADIATING PIPE MANUFACTURING CO.,LTD.) was
established in 2002, which is located in Jiangsu, China. After many
years of development, the company now has 66 million yuan in fixed
assets, more than 200 employees, and 33 technical staffs. We have 4
aluminum processing production lines, with the annual processing
capacity of more than 20,000 tons; And we have 5 tube-drawing
production lines; 47 fintube production lines, 1 imported
production line from American with the brand of McElroy , with the
annual production capacity of 12 million meters the above. Quality
is the theme of eternal pursuit of winner -Production workshop-
Meticulous works, standardized management system and systematic
quality assurance are Dellok(YONGHUI)'s best commitment to quality.
In Dellok(YONGHUI), the quality control is not only the detection
of the final process, but throughout the entire production process.
We implement a set of quality control and assurance systems. Each
batch of pipes is sampled and tested, and records are kept as a
quality guarantee for the final product.}

^{Studded Tube Product Description:}

^{Resistance Welding of Studs on Bare Tubes is used to create the
studded Fin Tube.}

^{The fins are made via electrical resistance welding of the Fin
Material, which is essentially a stud or rod welded to the tube at
the base.}

^{The current is directed through the Tube and the studs’ bases. The
studs are created in certain shapes to help with the welding
process. The Stud is manually forced on the tube at the site of
welding during the finning “welding” process, resulting in a very
good mechanical bond. Fin Tubes of this sort are well-suited to
high-pressure and high-temperature applications. The mechanical
bond is quite strong, thus it is used in places where there will be
a lot of mechanical pressure and stress during the process or
cleaning, for example.}

^{Fin Tubes are used in Finned Pipes, Air Coolers, Heat Exchangers,
and other applications, and are favoured in industries such as
Petrochemical Refineries, Power Plants, Chemical Industries, Steel
Plants, and so on.}

^{Studded Tube(Stainless
Steel Welded Tube) Manufacturing Process:}

^{The steel studs are automatically resistance welded to the tube,
producing high quality forge welds. The welding process enables the
combination of any grades for studs and tube: carbon, low alloy,
stainless steels and high nickel alloys.}

^{Studded Tube(Welded
Stainless Tube) Advantages:}

^{Due to their high rigidity, studded tubes can be used even under
extreme temperature and pressure conditions.}

^{Studded Tube(Black
Welded Pipe) Properties:}

^{Manufacturing Process:- Electric Resistance Welding}

^{Fin To Tube Bond:- Excellent}

^{Heat Transfer Efficiency:- Excellent}

^{Mechanical Resistance:- Excellent (Hence can be frequently cleaned
with high pressure jets unlike other fin tubes. Thereby reducing
down time and increasing overall life)}

^{Corrosion Protection:- Gives excellent corrosion protection to the
base tube since it entirely covers the base tube (except bare
ends).}

^{Temperature Range:- Depending on Properties of material of Fin
(Stud) and Pipe}

^{Studded Tube(Weld
Galvanized Pipe) Applications:}

^{Steel studded tubes are used instead of finned tubes for heat
transfer in the processing industries, generally in furnaces, gas
turbines, fired heaters and furnace applications where the surface
is exposed to a very corrosive environment and where very dirty gas
streams require frequent or aggressive cleaning}

^{Studded Tube(Fin Tube) Specifications:}

^{Product Specification}
^{Tube OD}	^{25~273 (mm)}	^{1”~10” (NPS)}
^{Tube Wall Thk}	^{3.5~28.6 (mm)}	^{0.14”~1.1”}
^{Tube Length}	^{≤25,000 (mm)}	^{≤82 ft}
^{Stud Thk}	^{6~25.4 (mm)}	^0.23”~1”
^{Stud Height}	^{10~35 (mm)}	^{0.4”~1.38”}
^{Stud Pitch}	^{8~30 (mm)}	^{0.3”~1.2”}
^{Stud Type}	^{Cylindrical, Elliptical, Lens type}
^{Stud to tube surface angle}	^{Vertical or Angular}
^{Material Combinations}
^{Stud Material}	^{C.S. (most common grade: Q235B)}
	^{S.S. (most common grade are AISI 304, 316, 409, 410, 321,347)}
	^A.S.
^{Tube Material}	^{C.S. (most common grade: A106 Gr.B)}
	^{S.S. (most common grade are TP304,316, 321, 347)}
	^{A.S. (most common grade are T/P5,9,11,22,91)}
^{Type of Service}	^{High temperature}

^{Product Categories : Studded
Tube}

Product Description

^{STUDDED TUBE}

^{Studded tubes are used as substitution of finned tubes for heat
transfer in the petrochemical industry, generally in fired heaters
and boilers where the surface is exposed to a very corrosive
environment and where very dirty soot formation require frequent or
aggressive cleaning.}

^{FABRICATION PROCESS}

^{The studs are automatically welded to the tube by electric
resistance welding machine. The welding process is controlled by
PLC program, stepping motor, indexing adopt brake motor. All the
welding parameters such as number of studs, pitch, compensation
coefficient etc. are input via human machine interface(HMI),
Product quality could be guaranteed by the settings according to
the process requirements.}

^{The automatic stud feeder was developed by our engineers combining
both our large experience manufacturing extended surface and the
most modern control technology available in the market. The
technology has benefited us with more efficient production and
consistent welding quality.}

^APPLICAITONS

^{Murphy's studded tubes are generally installed in the convection
sections and boilers where the surface is exposed to a severe
operating case of dirty flue gas.}

^{Frequently Asked Questions (FAQ) About Studded Tubes:}

^{1. What is a Studded Tube?}

^{Studded tubes are a type of metal tubes. These tubes have studs
welded onto the metal tube.}

^{These studs are arranged in a specific formation throughout the
length of the tube.}

^{They are often used in boilers and refineries. As they increase the
surface area for higher heat transfer they are used for reheating.}

^{2. Why use studded tubes?}

^{The heat exchange efficiency is equivalent to 2-3 times that of the
bare pipe.}

^{Easier cleaning especially for operating cases with very dirty flue
gas produced by burning heavy oil, diesel or residual oil.}

^{To increase the film heat transfer coefficient of flue gas to the
furnace tube.}

^{Increase efficiency in the process of heat recovery and direct
flame hostile atmospheres.}

^{Reduce the amount of bare pipes used in these processes. (Heat
transfer surface of one studded pipe is equivalent to surface of 4
to 10 bare pipes). Stud Pipe's ideal for processes applications
where dirty fuels are used and harsh environments in terms of
temperature and/or corrosion.}

^{Studded fin tube is a standard frequency electric-resistance-welded
studded type surface. It is normally manufactured with round carbon
steed studs on carbon, alloy or stainless steel tubes with
diameters from 1.5" to 12.75".}

^{3. What are the important factors for high frequency welding?}

^{The four most important factors / process parameters influence High
frequency welding are}

^{Electrical power}

^{Pressure applied}

^{Welding time}

^{Cooling time}

^{Finding the optimal process parameters will depend on your specific
equipment, the materials involved and the specific geometries
including thickness and area to be welded. Achieving optimal
results is often an experimental process guided by experience. As a
guiding rule, the thicker material and focus on short weld times
you need, the stronger electrical power / HF generator you need.}

^{4. What is High Frequency welding?}

^{High frequency welding (often abbreviated HF welding or RF welding)
is a manufacturing process where two plastic parts are welded
together using an electromagnetic field. The resulting join can be
very strong – often close to the original strength of the materials
joined. In some scenarios the weld can be even stronger than the
original materials.}

^{Using a high frequency electromagnetic field, the material is
heated and pressure added to melt and fuse the two materials
together. No outside heart is applied. Instead the heat is
generated within the materials. During cooling (under continued
pressure), the materials are fused together and a weld has been
created. This results in a very strong bond between the two parts.}

^{5. Where are Studded Tubes used?}

^{Studded tubes are used instead of finned tubes for heat transfer in
the processing industries, generally in furnaces, gas turbines,
fired heaters and furnace applications where the surface is exposed
to a very corrosive environment and where very dirty gas streams
require frequent or aggressive cleaning.}

^{6. How do you control your quality?}

^{We always put quality as the most important thing for customers,
and we control the quality from raw material inspection, production
checking to water pressure test and strength test. Also the third
party can be authorized to check.}

^{Incoming inspection report for bare tube & strip.}

^{Mill test certification for bare tube}

^{Mill test certification for fin}

^{Mill test certification for finned tube}

^{Finned tubes dimension & visual inspection reports}

DELLOK Resistance Welding Studded Tube For Air Coolers

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