DELLOK Petrochemical Industry Carbon Steel Studded Tube Polishing

^{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}