As the winter chill sets in, ensuring proper heating solutions in various environments becomes paramount. One technology that has revolutionized the way we approach heating applications is self-regulating heating cables. These innovative cables offer a dynamic and efficient solution for maintaining optimal temperatures in a variety of settings.

Self-regulating heating cables are designed to adapt their heat output based on the surrounding temperature. Unlike traditional heating cables, which operate at a constant wattage, self-regulating cables automatically adjust their power output in response to changes in ambient conditions. This self-regulating feature not only enhances energy efficiency but also provides an added layer of safety by preventing overheating.

One of the key advantages of self-regulating heating cables is their versatility. From freeze protection in pipelines and roofs to maintaining temperatures in industrial processes, these cables can be tailored to meet a wide range of heating requirements. Their flexibility and ease of installation make them a popular choice for both residential and commercial applications.

Moreover, the self-regulating capability of these heating cables results in significant cost savings. By consuming power only when and where it is needed, they help reduce energy consumption and minimize operational costs. This efficiency not only benefits the environment by lowering carbon footprints but also translates into tangible savings for users.

In addition to their energy efficiency, self-regulating heating cables are known for their durability and reliability. Built to withstand harsh environments and temperature variations, these cables offer long-term performance and require minimal maintenance. This reliability makes them a trusted solution for critical heating applications where uninterrupted operation is essential.

In conclusion, self-regulating heating cables represent a cutting-edge technology that combines efficiency, versatility, and reliability. Whether used for freeze protection, temperature maintenance, or process heating, these cables offer a cost-effective and sustainable solution for a wide range of heating needs. Embracing this advanced heating technology can not only enhance comfort and safety but also contribute to more sustainable and energy-efficient practices.

Stay warm, stay efficient with self-regulating heating cables!

Heating cable is a cable structure that uses electricity as energy and uses alloy resistance wire or far-infrared carbon fiber heating element to generate electricity and heat. It is called carbon fiber heating cable or carbon fiber heating wire. It is used in electric floor heating system, also known as carbon fiber floor heating, to achieve heating or insulation effect. Using alloy resistance wire, it is called heating cable, heating cable, metal heating cable. Its purpose is to heat residential space and antifreeze heating cable.

Working principle of heating cable:

The inner core of the heating cable is composed of cold wire and hot wire, and the outer core is composed of insulating layer, grounding layer, shielding layer and outer sheath. When the heating cable is energized, the hot wire heats up and works at a temperature of 40-60 °C. The heating cable buried in the filling layer transmits heat energy to the heated body through heat conduction (convection) and far infrared radiation of 8-13um.

Composition and working principle of the floor heating system by heating cable:

Power supply line → transformer → low-voltage power distribution device → household electricity meter → thermostat → heating cable → heat radiation to the room through the floor

a. Electricity as energy

b. Heating cable as heating element

c. Heat conduction mechanism of heating cable

(1) When the heating cable is energized, it heats up, and its temperature is between 40℃ and 60℃. Through contact conduction, it heats the cement layer around it, and then transmits it to the floor or tiles, and then heats the air through convection. The conducted heat accounts for 50% of the heat generated by the heating cable.

(2) The second part is that when the heating cable is energized, it generates 7-10 micron far infrared rays that are most suitable for the human body and radiate to the human body and space. This part of the heat also accounts for 50% of the heat generated, and the heating efficiency of the heating cable is close to 100%.

When the heating cable is energized, the hot wire composed of nickel metal alloy inside heats up and works at a low temperature of 40-60℃. The heating cable buried in the filling layer transfers heat energy to the heated body through thermal conduction (convection) and 8-13μm far infrared radiation.

Congratulation Our Successful Exhibition In Vietnam International Plastics & Rubber Industry Exhibition

The production of plastic products in Vietnam witha growth rate of 15% each year later. Vietnam’s plastics industry has around 2,000 businesses, and 83% are located in the Ho Chi Minh City. Its plastics products having a great competitive edge for packaging, household products, and construction and engineering plastics. The Vietnam International Plastics & Rubber Industry Exhibition has been seen as the best path to enter Vietnam market, and the most beneficial way to promote products, services and machinery internationally.

We exhibit the 22nd  Vietnam International Plastics & Rubber Industry Exhibition in Saigon Exhibition & Conference Center (SECC) from 16th Oct. to 20th Oct.

We exhibit thelatest trends and innovations in E-TPU molding products, TPU resin, TPE resin. E-TPU molding products includeInjection Molding,Compression Molding,Extrusion Molding,Overmolding. TPU resin such as TPU specialized in production oil seal which required excellent oil resistance properties.

Our display rack attracted many professional visitor. The visitor got our professional answer to their question.

We also meet and communication with our old friends in Vietnam.

What is a forged tube sheet?

Forging is a process of manufacturing components by plastic deformation of metal. During the forging process, the metal is pressed to the desired shape. A forged tubesheet is commonly made from a round disc forging with holes drilled to accept the tubes or pipes in an accurate location and pattern relative to one another. The advantages of forging tube sheets are high density, high strength, and good toughness. However, due to the high temperature and specialized equipment required for forging, the cost is relatively high.

A forged tube sheet is a critical component in shell-and-tube heat exchangers. It serves as a support for the heat exchanger tubes and provides a sealed barrier at the ends of the tubes to prevent leakage between the tube-side and shell-side fluids, ensure effective heat transfer or to support filter elements. In shell and tube heat exchangers, two plates support the tubes, one on each end. They are in contact with both fluids on the shell side and the tube side, so they must be corrosion resistant and sealed tightly. Many heat exchanger design codes and standards require forged tubesheets.

Forged Tube Sheet Production Standards:

The production standards for forged tube sheets can vary depending on the specific industry and application. However, some common standards that may be followed include:

1.ASME (American Society of Mechanical Engineers) Standards: ASME Boiler and Pressure Vessel Code (BPVC) provides guidelines and standards for the design, fabrication, and inspection of pressure vessels, including heat exchangers. ASME standards ensure that the equipment meets safety and performance requirements.

2. ASTM (American Society for Testing and Materials) Standards: ASTM specifications provide guidelines for the materials used in the fabrication of tube sheets. Different grades of materials are specified based on factors such as temperature, pressure, and corrosion resistance.

Material of Forged Tube Sheets:

The choice of material for forged tube sheets depends on the specific requirements of the application. Common the material include: carbon steel tube sheets, stainless steel tube sheets, alloy steel tube sheets. A tubesheet may be covered in a cladding material which serves as a corrosion barrier and insulator which is weld overlay tube sheets. (Know more about welding overlay tube sheet)

Forgings for manufacturing tube sheets need to meet the following performance requirements:

1. High strength: able to withstand high pressure and impact loads, ensuring the stability and safe operation of the tube sheet.

2. Good corrosion resistance: It can resist the corrosion of the medium and extend the service life of the tubesheet.

3. Good sealing: Ensure the normal operation of the tube plate and prevent medium leakage.

4. Good processability: Easy to process into complex shapes to meet the design requirements of tubesheets.

Forged tube sheets find applications in various industries, including:

1. Petrochemical Industry: For heat exchangers in refineries and chemical processing plants.

2. Power Generation: In boilers and steam generators.

3. Oil and Gas Industry: For heat exchangers in oil refineries and offshore platforms.

4. Chemical Processing: In chemical reactors and processing equipment.

Forged tube sheets are crucial components in heat exchangers, manufactured through a forging process to achieve specific mechanical properties. They adhere to industry standards and are chosen for their strength, durability, and resistance to corrosion in various industrial applications. Wuxi changrun specialized in forged tube sheet manufacture.

What are the long weld neck flanges?

A long weld neck flange is a type of flange that features an extended neck or hub. It has a long, tapered neck that is welded to the pipe, providing a smooth transition between the flange and the pipe. The extended neck provides reinforcement and additional strength to the joint.

The Long Weld Neck (LWN) connection is the lightest and most economical connections offered for use where a minimum of reinforcing area is required. It is the most commonly used nozzle in the ASME pressure vessel industry. A Long Weld Neck is also the lightest wall connection of the nozzle family. The nozzle that follows the Long Weld Neck with a slightly heavier wall barrel is known as the Heavy Barrel (HB).

The fuction of long weld neck flange

Long weld neck flanges are commonly used in piping systems that require high-pressure and high-temperature applications. The extended neck allows for better flow characteristics, minimizing turbulence and pressure drop. It also provides additional space for insulation or corrosion-resistant coatings .Long Weld Neck connections are a crucial part of the pressure vessel industry. Welding is the most efficient and cost-effective way to connect two pieces of metal, so it is the material of choice for many industries, including petrochemical and aerospace.

The design of a long weld neck flange allows for easy welding, making it suitable for critical connections where strength, integrity, and leak-free performance are essential. The longer neck allows for a more gradual transition, reducing stress concentration and improving the overall structural integrity of the joint. Due to their robust design and superior performance, long weld neck flanges are widely used in industries such as oil and gas, petrochemical, power generation, and chemical processing. They are typically made from high-quality materials, such as carbon steel long weld neck flanges, stainless steel long weld neck flanges, or alloy steel long weld neck flanges, to ensure durability and resistance to corrosion.

A long weld neck flange is a specialized flange with an extended neck or hub. It provides strength, smooth flow characteristics, and easy welding in high-pressure and high-temperature piping systems, making it an ideal choice for critical applications.

Wuxi changrun’s product offering with a wide spectrum of ASME pressure vessel connections makes it simple on the customer, as we are capable of producing a nozzle for every application in the pressure vessel industry. Our Long Weld Neck connections are available in various seamless configurations for custom pressure vessel connections. They provide leak-free, long-term service in high-pressure environments.

Duplex steel has become increasingly popular in industrial settings due to its unique properties, high strength, corrosion resistance, and durability. One of the most commonly used components made from duplex steel is the duplex steel elbow. This component is found in numerous industries, including oil and gas, chemical, and petrochemical manufacturing. This blog post will discuss everything you need to know about duplex steel elbows.

What is the role of elbows in pipelines? 

Elbows belong to pipe fittings, and the purpose of using elbows in pipelines is to change the direction of the pipeline. Elbows are used at the turning point of the pipeline to change the direction of the pipeline. The angles of elbows include 15 degree elbows, 30 degree elbows, 45 degree elbows, 60 degree elbows, 90 degree elbows, and 180 degree elbows. The type of elbow including long-radius elbows, short-radius elbows, seamless elbows, and welded elbows. These are the most commonly used elbow angles, which need to be ordered and made according to the installation needs of the construction site project. Long and short-radius elbows differ in their radius of curvature, with long-radius elbows having a larger radius than short-radius elbows. Seamless elbows are made from a single piece of steel and are available in a wider range of sizes and wall thicknesses than welded elbows.The materials can be divided into stainless steel elbows, carbon steel elbows, alloy steel elbows, and duplex steel elbows. When connecting elbows and pipelines, welding is used. Therefore, for the convenience of welding, the ends of general elbows need to be bevelled.

Why Use Duplex Steel Elbows?

Duplex steel is a type of stainless steel with a two-phase microstructure consisting of austenitic and ferritic stainless steel. This type of steel offers a unique combination of strength, corrosion resistance, and durability, making it the perfect material for industrial applications. The use of duplex steel elbows offers several advantages over other types of elbows. One of the main benefits is their excellent corrosion resistance, making them suitable for use in harsh environments such as offshore oil rigs, where exposure to seawater can cause significant damage to traditional piping systems. Duplex steel elbows are also known for their high strength, which allows them to withstand high pressure and temperature fluctuations without developing cracks or leaks.

Applications Of Duplex Steel Elbows

Duplex steel elbows are used in various industrial applications, including chemical processing, oil and gas, petrochemical manufacturing, and offshore platforms. They are also found in power generation plants, pharmaceutical manufacturing, and food processing facilities. Their durability, strength, and corrosion resistance make them suitable in environments where other materials would quickly degrade.

Conclusion

Duplex steel elbows are essential to numerous industrial applications and offer many benefits over traditional piping systems. Their superior strength and corrosion resistance are ideal for harsh environments such as offshore oil rigs. Duplex steel elbows can provide long-lasting, reliable functions in various applications with regular maintenance and care. This blog post has provided valuable insights into everything you need about duplex steel elbows. Wuxi Cahngrun good at pipe fitting manufacture, choose us is one of your best choice.

What is a tube sheet for heat exchanger?

One of the most common heat exchangers in service within industrial process applications is the “Tube Sheet Heat Exchangers”. They are available in many shapes, sizes and have been used in industry for over 150 years. In this exchanger group are various sub design types: Fixed, U-tube and Floating tubes heet. Variations of all can be denoted as type “E”, “F”, “G”, “H”, “J”, “K” or “X”. The main applications are where high pressure/temperatures are key considerations. Loosely, general designs consist of the/an outer shell in which resides a tube bundle (these can be configured as finned, plain etc) sealed at each end by a tube sheet which isolates the tubes and the outer shell.

How does a heat exchanger work?

Tube Sheet Heat Exchangers have the capability to transfer large amounts of heat at low(er) costs. This, in principle, down to both design simplicity and effectiveness – large tube surface for reduced weight, volume of liquid and importantly floor space.

Whilst there is a wide variety to choose from there are certain key components similar in all. Tube sheets have tubes attached to them within the body or “shell” of the heat exchanger. The tubes allow the movement of a given medium (gas/fluid) through the shell chamber stopping it mixing with a second fluid medium that lies outside these tubes. As long as there is a temperature difference between these, in effect, the two flow past one another exchanging heat without ever mixing. Tube sheets can be fixed or floating dependent on the application the heat exchanger is designed for.

The role of tube sheets in heat exchangers

Tube sheets are a critical component of the final design. There are a multitude of materials they can be manufactured from. Material selection is made after careful consideration as it is in contact with both fluids. It must therefore have the necessary corrosion resistance, electromechanical and metallurgical properties associated for its given working environment.

The tube sheets themselves contain holes drilled into them. This, in a given, very specific design configuration, at very precise locations with critical tolerances. The amounts of holes can range from a few to thousands. These pattern or “pitch” holes are relative to each other tube sheet within the shell. This pitch changes tube distance, angle and flow direction. These parameters have been varied to maximize the heat transfer effectiveness.

Tube Sheet Heat Exchangers of the big advantages of using a shell and tube heat exchanger is that they are often easy to service, particularly with models where a floating tube bundle where the tube plates are not welded to the outer shell is available. Fixed Tube Sheet Heat Exchangers used on fixed tube sheet heat exchangers. 

Tube Sheet Heat Exchangers the right choice of materials they can also be used to cool or heat other mediums, such as swimming pool water or charge air. Fixed Tube Sheet Heat Exchangers ideal cooling solution for a wide variety of applications. One of the most common applications is the cooling of hydraulic fluid and oil in engines, transmissions and hydraulic power packs.

How does wuxi changrun work?

Because these tube sheets are the main, critical，Wuxi changrun manufactures directly to OEM drawings issued as DXF files. The in house Delcam FeatureCam CAD reading capabilities mean the final product supplied from us is manufactured to the exacting specifications as designed, released and issued from you the client.

Wuxi changrun’s considerable experience in this highly specialized area means that whatever the requirement, whatever the timescale, we have the technical, in house experience and know-how to approach a given task, deliver on time and in budget. This is why the company is entrusted to manufacture to key, blue chip clients across the globe.

What are Carbon Steel Flanges?

Under the imaginative direction of competent personnel, Carbon Steel Flanges are meticulously designed employing modern procedures in the manufacturing facility. To ensure flawlessness and defect-freeness, the offered range is rigorously tested on several quality factors. Due to their unique qualities, these items are highly regarded by customers and employed extensively throughout several industries. offered range is packaged with quality assurance.

Carbon Steel Flanges are used to terminate or join two ends of a pipe. The materials they are made from vary. The carbon steel flange is one example of such a type of flange made from carbon steel. Raw materials used in the production of these flanges are of the highest quality. They contain carbon in the range of 0.25 to 0.60 percent. Due to the high amount of carbon and manganese in the product, it has exceptional ductility and outstanding fabrication qualities.

The manufacturing process of carbon steel flanges

The production process of carbon steel flanges generally includes forging, casting, and machining. Forged flange is the process of heating a steel ingot at a high temperature of 1600 ℃, then cooling it to around 800 ℃, and using methods such as hammering or hydraulic pressure to deform the ingot into shape; Casting flanges is the process of pouring liquid steel into a mold, cooling and solidifying it to form a flange. Processing flanges is the process of cutting, forming, and processing plates or round materials. The production process time is relatively short and the price is relatively low, but its strength and pressure resistance are generally weak.

Applications of Carbon Steel Flanges

The term “killed Carbon Steel Forged Flanges” refers to a different kind of flange. During the melting process, they are eliminated. Deoxidation occurs as a result of the inclusion of manganese, silicon, and aluminum during the manufacturing of steel. To assist in bolting and joining two pipes together, carbon steel plate flanges are welded onto the pipe Ductile and tough, it is suitable for a variety of applications. These Carbon Steel Pipe Flanges are also highly reliable in frigid temperatures. A water pipeline and a fuel pipeline use them.

To make the steel and cast iron alloy stronger and harder Quenching is the procedure that Carbon Steel Slip On Flanges goes through. They are employed in a variety of petrochemical, engineering, and construction fields. The slip-on flange’s outer diameter is also welded. The end of carbon steel weld neck flanges extends the neck. For a seamless connection, this kind of flange is immediately buttwelded to the pipe. When the conditions are critical and extreme, Indian suppliers of carbon steel flanges advise using these products.

summary

Carbon steel flange is a common accessory for connecting pipes and valve equipment, which is widely used in petroleum, chemical, shipping, power and other industries. Carbon steel flanges can be classified into various types based on material and structure, which are suitable for different pipeline connection methods and requirements. When selecting carbon steel flanges, it is necessary to choose according to actual needs and requirements to ensure the safety and stability of connection and operation.

A CNC machined tube plate refers to a tube sheet or plate that has undergone precision machining using a Computer Numerical Control (CNC) machine.  CNC machining involves the use of computer numerical control to automate and control the movement of machining tools and equipment. This technology allows for precise and accurate shaping, cutting, and drilling of materials, including metal plates used in various applications.

Information on CNC machining tube plates

1. Tube Sheet in Heat Exchangers: In the context of heat exchangers, a tube sheet is a plate that separates the fluid in the tubes from the fluid in the shell of the heat exchanger. CNC machining can be used to create precise holes in the tube sheet for the tubes to pass through.

2. CNC Tube Cutting: This could refer to the process of using CNC machines to cut tubes into specific lengths or shapes. CNC tube cutting is commonly used in industries such as automotive, aerospace, and construction.

3. Tube Plate in Structural Engineering: In structural engineering, a tube plate might be a component used in the construction of steel structures, such as trusses or frames. CNC machining can be employed to create precise cuts and holes in these plates.

CNC machining tube plate

1. Hole Drilling: CNC machines can accurately drill holes in tube plates to accommodate tubes in heat exchangers or other systems. The hole patterns need to be precisely designed to ensure proper alignment and fit.

2. Milling and Cutting: CNC milling machines can be employed to cut and shape tube plates according to specific designs and requirements. This can include creating intricate patterns or features on the surface of the tube plate.

3. Surface Finishing: CNC machining can be used to achieve a smooth and precise finish on the surface of the tube plate. This is important for both functional and aesthetic reasons, depending on the application.

4. Customization: CNC machining allows for a high level of customization. Tube plates can be machined to exact specifications, accommodating different sizes, hole patterns, and materials based on the requirements of the specific application.

CNC machined tube plates are commonly used in the construction of heat exchangers, boilers, and similar equipment where precise alignment and secure attachment of tubes are essential for efficient heat transfer. The use of CNC machining ensures the production of high-quality, accurate, and repeatable tube plates in various industrial settings. 

Relying on the top processing equipment cluster, wuxi changrun can provide multiple processes from material to cutting, beveling, welding, heat treatment, vertical turning, drilling and so on; Capable of processing tube plates and folding plates made of diversified materials such as pure titanium, stainless steel composite, high-specification stainless steel and various high-strength steels.

A shell and tube heat exchanger consists of a shell, heat transfer tube bundle, tube sheet, baffle plate (baffle), and channel. The shell is mostly cylindrical with a tube bundle inside, and the two ends of the tube bundle are fixed on the tubesheet. There are two types of heat transfer fluids: hot fluid and cold fluid. One is the fluid inside the tube, called the tube side fluid; Another type is the fluid outside the pipe, called the shell side fluid.

1. What is Shell?

The shell serves as the outer housing of the heat exchanger. It contains one of the fluid streams and is typically constructed from materials such as carbon steel, stainless steel, or other alloys depending on the application and operating conditions.

2. What is Tube Bundle?

The tube bundle is the core component of the heat exchanger where heat transfer occurs. It consists of a series of tubes through which one fluid flows while the other fluid flows around the outside of the tubes. The tubes can be straight or bent, and they are usually made of materials such as copper, stainless steel, or titanium.

3. What is Tubesheet?

The tubesheet is a thick metal plate located at both ends of the tube bundle. It serves to support and secure the tubes in place, providing a leak-proof seal between the tube bundle and the shell.

4. What are Baffles?

Baffles are plates or spacers placed inside the shell to direct the flow of the shell-side fluid. They promote turbulence in the fluid flow, which enhances heat transfer efficiency by increasing the mixing of the fluid. Baffles also help to support the tubes and prevent vibration.

5. What is Baffle Plate?

The baffle plate is a large plate attached to the inner wall of the shell. It supports the baffles and helps to guide the flow of the shell-side fluid through the heat exchanger.

6. What is Front Channel and Rear Channel?

These are the spaces between the baffles where the shell-side fluid flows around the tube bundle. The front channel is located near the inlet of the shell-side fluid, while the rear channel is located near the outlet.

7. What is Tube Side Connection?

These are the inlet and outlet connections for the fluid flowing through the tubes. They allow the tube-side fluid to enter and exit the heat exchanger.

8. What is Shell Side Connection?

These are the inlet and outlet connections for the fluid flowing around the outside of the tubes. They allow the shell-side fluid to enter and exit the heat exchanger.

9. What is Vent?

The vent is an opening on the shell of the heat exchanger used to remove trapped air or gases during startup or operation. It ensures proper operation and prevents air pockets from interfering with heat transfer.

10. What is Drain?

The drain is an opening on the shell or tubesheet used to remove liquid from the heat exchanger. It is typically used for maintenance purposes or for draining the system during shutdowns.

11. What is Expansion Joint?

An expansion joint is a flexible element installed in the shell or tube bundle to accommodate thermal expansion and contraction. It prevents damage to the heat exchanger caused by temperature fluctuations.

12. What are Heat Exchanger Legs?

Legs are support structures attached to the bottom of the heat exchanger to elevate it above the ground or other surfaces. They provide stability and facilitate installation and maintenance.

13. Lifting Lug?

Lifting lugs are welded to the shell of the heat exchanger and used for lifting and handling during installation or maintenance.

14. Reinforcing Pad?

Reinforcing pads are additional material welded to the shell or other components to strengthen areas subjected to high stress or pressure, such as nozzle connections.

These components work together to facilitate efficient heat transfer between the two fluid streams while ensuring structural integrity, reliability, and safety of the heat exchanger. 

Wuxi Changrun has provided high-quality tube sheets, nozzles, flanges, and customized forgings for heat exchangers, boilers, pressure vessels, etc. to many well-known petrochemical enterprises at home and abroad. Our customers include PetroChina, Sinopec, Chevron, Bayer, Shell, BASF, etc. Send your drawings to sales@wuxichangrun.com We will provide you with the best quotation and the highest quality products.