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What are threaded pipes?

What is the meaning of threaded pipes?

Threaded pipe is a type of pipe with threaded ends that have external or internal threads that can be connected to other threaded pipes or threaded fittings to form a sealed connection.

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What are the types of threads used on pipelines?

The following types of threads are commonly used in general industrial piping.

  • NPT thread: The NPT (National Pipe Thread) thread is a common American standard thread that is widely used in piping connections for gases and liquids. the NPT thread has a conical thread profile that provides excellent sealing performance, but is only suitable for low pressure and low temperature piping systems.
  • BSP thread: BSP (British Standard Pipe) thread is a British standard thread and is a common type of pipe thread, which can be divided into two types: cylindrical and conical.
  • G thread: G (German) thread is a German standard thread, mainly used for low pressure gas and liquid piping connections.G thread is very similar to BSP thread, but the difference between them is the thread angle and thread size.
  • NPS thread: The NPS (Nominal Pipe Size) thread is an American standard thread used in large diameter piping systems, and is characterized by a parallel thread profile for high pressure and high temperature piping systems.

The above thread types are used in different countries and regions and should be selected according to the actual situation.

Features of threaded pipe

  • Easy to connect: The threaded pipe has a threaded connection, which is easy to install and easy to disassemble.
  • Reliable sealing: The threaded structure of the threaded pipe can achieve sealing to avoid fluid or gas leakage, which improves the safety of use.
  • High tensile strength: The threaded pipe is made of high strength material, which has high tensile strength and can withstand certain external force and pressure.
  • High corrosion resistance: Some threaded pipes are made of stainless steel and other materials, which have good corrosion resistance and are suitable for use in harsh environments.

Classification of threaded tubes

Threaded tube is also divided into external threaded tube and internal threaded tube, and internal threaded tube is also called dry evaporator tube, internal ribbed tube or internal fin tube. It is mainly used for dry evaporators in central air conditioning units.
The female threaded tube is also called dry evaporator tube, internal rib tube or internal fin tube. It is mainly used in central air conditioning units on dry type female threaded tube evaporators, where the who outside the tube is cooled by the evaporating and expanding refrigerant inside the tube during heat exchange; it is also used on domestic and commercial air conditioning heat exchangers or for high heat pipes. The internal surface area per unit length of the internally threaded tube is 1.5-2 times that of the ordinary glossy copper tube, and its heat transfer coefficient is 1.5-2.4 times that of the glossy copper tube of the same specification. And only 3-5% increase in the carrier flow resistance, can save 20-35%, suitable for refrigeration air conditioners reduce the weight of the whole 10-25%.
Threaded pipe can be classified according to different classification methods, the following are some common classification methods.

  • Classification by application: Threaded pipe can be used in a variety of fields such as oil, natural gas, chemical and thermal power. According to different uses, threaded pipe can be classified into oil threaded pipe, natural gas threaded pipe, chemical threaded pipe, etc.
  • Classification by material: Threaded pipe is made of a wide range of materials, including carbon steel, alloy steel, stainless steel, titanium alloy, etc. According to the different materials, the threaded pipe can be divided into carbon steel threaded pipe, alloy steel threaded pipe, stainless steel threaded pipe, titanium alloy threaded pipe, etc.
  • Classification by production standard: There are many kinds of production standards for threaded pipes, the common ones are American standard (API), European standard (EN), German standard (DIN) and so on. According to the different production standards, threaded pipes can be divided into API threaded pipes, EN threaded pipes, DIN threaded pipes, etc.
  • Classification by thread type: There are also many types of thread types for threaded pipes, and the common ones are API thread, NPT thread, BSP thread, etc. According to the different thread types, the threaded pipe can be divided into API threaded pipe, NPT threaded pipe, BSP threaded pipe, etc.
  • Classification by connection method: There are many kinds of connection methods for threaded pipes, and the common ones are welding, threaded connection, flange connection, etc. According to the different connection methods, threaded pipe can be divided into welded threaded pipe, threaded connection threaded pipe, flange connection threaded pipe, etc.

Material of threaded pipe

There are various metal materials of threaded pipe, such as carbon steel, alloy steel, stainless steel, titanium alloy, etc. Depending on the metal material, threaded pipe can be divided into carbon steel threaded pipe, alloy steel threaded pipe, stainless steel threaded pipe, titanium alloy threaded pipe, etc. Please expand the detailed description
According to different working conditions and requirements, threaded pipes can be selected from different materials. Below we will introduce the common materials of threaded pipe in detail.
Carbon steel threaded pipe
Carbon steel threaded pipe is a widely used material for threaded pipe because of its good mechanical properties and cost effectiveness. Carbon steel threaded pipe can be divided into two types: ordinary carbon steel and low-alloy high-strength steel, whose main characteristics are high strength, good weldability and poor corrosion resistance. The applicable temperature range of carbon steel threaded pipe is generally between -29℃ and 425℃.
Alloy steel threaded pipe
Alloy steel threaded pipe has high strength and corrosion resistance, and its main components are chromium, molybdenum, nickel and other alloying elements. Alloy steel threaded pipe can be divided into three types: low alloy steel, medium alloy steel and high alloy steel, and the applicable temperature range is between -29℃ and 550℃. Alloy steel threaded pipe can be used in high temperature and high pressure, corrosive environment, such as petrochemical, electric power and other industries.
Stainless steel threaded pipe
Stainless steel threaded pipe has good corrosion resistance, aesthetics and high temperature resistance, and its main components are chromium, nickel and other alloy elements. Stainless steel threaded pipe can be divided into three kinds of austenitic stainless steel, ferritic stainless steel and duplex stainless steel, and the applicable temperature range is between -196℃ and 800℃. Stainless steel threaded pipes are widely used in food, chemical, pharmaceutical, textile and other industries, as well as piping systems in marine and hydrogen chloride environments.
Titanium threaded pipe
Titanium alloy threaded pipe has the advantages of light weight, high strength and corrosion resistance, and is a high-grade threaded pipe material. Titanium alloy threaded pipe can be divided into four types: pure titanium, α type, β type and α+β type, and the applicable temperature range is from -253℃ to 500℃. Titanium alloy threaded pipe is widely used in aviation, aerospace, marine and other fields.

Stainless Steel Threaded Pipe ASTM/ASME A/SA182:- F304, F304L, F316, F316L, ASTM/ASME A/SA351:- CF3, CF3M, CF8, CF8M, DIN 1.4306, DIN 1.4301, DIN 1.4404, DIN 1.4401, DIN 1.4408, DIN 1.4308, DIN 1.4306, DIN 1.4409
Duplex Threaded Pipe S31803 / S32205 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex Threaded Pipe S32750 / S32760 A182:- Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Copper Nickel Threaded Pipe ASTM / ASME SB 61 / 62 / 151 / 152, Copper Nickel 90/10 (C70600 ), Cupro Nickel 70/30 (C71500), UNS C71640
Titanium Threaded Pipe ASTM B381 / ASME SB381:- Titanium Gr. 1, Titanium Gr. 2, Titanium Gr. 4, Titanium Gr. 5, Titanium Gr. 7, ASTM R50250/GR.1|R50400/GR.2|R50550/GR.3|R50700/GR.4|GR.6|R52400/GR.7| R53400/GR.12|R56320/GR.9| R56400/GR.5
Copper Threaded Pipe TP1, TP2, C10930, C11000, C11300, C11400, C11500, C11600, C12000, C12200, C12300, T1, T2, C10100, C10200, C10300, C10400, C10500, C10700, C10800, C10910, C10920, TU1, TU2, C12500, C14200, C14420, C14500, C14510, C14520, C14530, C17200, C19200, C21000, C23000, C26000, C27000, C27400, C28000, C33000, C33200, C37000, C44300, C44400, C44500, C60800, C63020, C68700, C70400, C70600, C70620, C71000, C71500, C71520, C71640, etc
Incoloy Threaded Pipe ASTM B564 / ASME SB564:- Incoloy 800, 800H, 800HT (UNS N08800), 825 (UNS N08825), 925
Inconel Threaded Pipe ASTM B564 / ASME SB564:- Inconel 600, 601, 625, 718, 783, 690, x750
Nickel Threaded Pipe ASTM B564 / ASME SB564:- Nickel 200, Nickel 201, Nickel 205, Nickel 205LC
Hastelloy Threaded Pipe ASTM B564 / ASME SB564:- Hastelloy C276 (UNS N10276), C22 (UNS N06022), C4, C2000, B2, B3, X
Monel Threaded Pipe ASTM B564 / ASME SB564:- Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500)
Carbon Steel Threaded Pipe ASTM/ASME A/SA105 A/SA105N and A/SA216-WCB, DIN 1.0460, DIN 1.0402, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, CS High Yield ASTM A694 / A694 (F52, F56, F60, F65, F70, F80)
Alloy Steel Threaded Pipe ASTM A182 / ASME SA182:- F5, F9, F11, F12, F22, F91
Alloy 20 Threaded Pipe ASTM B462 / ASME SB462:- Carpenter 20 Alloy, Alloy 20Cb-3
254 SMO Threaded Pipe ASTM A182 / ASME SA182:- SMO 254/6Mo, UNS S31254, DIN 1.4547
Aluminium Threaded Pipe 5052 /6061/ 6063 / 2017 / 7075 / etc.
Brass Threaded Pipe 3602 / 2604 / H59 / H62 / etc.
Other Threaded Pipe material Tin bronze, Alumunum bronze, Lead bronze, Nimonic 75, Nimonic 80A, Nimonic 90, AISI 4140, AISI 4130, Mild Steel, Al6XN

The manufacturing process of threaded tubes

The manufacturing process of threaded pipe includes the following steps.

  • Material preparation: Threaded pipe is usually made of seamless or welded steel pipe as raw material. The pipe is subject to quality inspection and appearance check to determine if it meets the requirements.
  • Pre-processing: In order to improve processing efficiency and product quality, the steel pipe is usually subjected to pre-treatment processes such as pickling, roughing and annealing of the billet.
  • Processing: The pretreated steel pipe is fed into the threaded pipe processing equipment for processing. Usually rotary cutting or thread rolling is used to thread the pipe in order to connect the pipe to the joint. The threads are machined from one end of the pipe to internal threads and the other end to external threads.
  • Post-threading treatment: In order to improve the quality and service life of the threaded pipe, post-threading treatment is required. The treatment process includes quenching and tempering.
  • Surface treatment: In order to improve the corrosion resistance and aesthetics of the threaded pipe, the surface treatment is usually required. Common surface treatment methods include spraying, galvanizing, hot-dip galvanizing, etc.
  • Inspection and quality control: In order to ensure the quality and performance of the threaded pipe meet the standards, various tests are required, such as hardness test, pressure resistance test, chemical composition analysis, etc. Appearance inspection and dimensional inspection are also required to ensure the accuracy and quality of the threaded pipe.
  • Packaging and transportation: After strict quality control and testing, the threaded pipe needs to be packaged and marked for transportation and storage. Commonly used packaging methods include plastic bags, cartons, wooden boxes, etc.

It should be noted that since the manufacturing process of threaded pipe is complex and requires strict control of all aspects, manufacturers usually need to have certain manufacturing experience and technical strength to ensure the stability of product quality and performance.

Threaded tube forming principle

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For small diameter thin-walled stainless steel tube rigidity, small size characteristics, if the traditional processing method processing, not only manufacturing small size processing tools have difficulties, the accuracy of processing is not easy to ensure, and the product specifications are single. Considering the small-diameter thin-walled stainless steel tube shaping better, you can draw on the spinning processing method, that is, one end of the stainless steel tube fixed in the chuck through the clamping cylinder, the chuck is driven by the spindle motor rotation, spin wheel frame and stainless steel tube coaxial, equipped with a threaded cylinder and carbide spin wheel, spin wheel frame connected to the threaded motor through the screw, the threaded motor rotation drives the spin wheel frame axial movement. The stainless steel tube is continuously shaped and deformed point by point under the joint action of the radial extrusion of the spinning wheel and the spindle motor, as shown in the diagram of threaded tube forming.

Threaded pipe processing method

Threaded pipe has a spiral raised line on its surface to fit with other pipes or connectors. The following are common threaded pipe processing methods.

  • Rolling method: The round tube is placed on a special roller machine before processing, and the surface is pressed into a threaded shape using the die and rollers on the machine.
  • Cutting method: The round pipe is placed on the threaded lathe and the threaded shape is gradually cut on the surface of the pipe by the cutting tool.
  • Molding method: The round pipe before processing is placed on a special mold and its surface is pressed into a threaded shape by mechanical pressure.
  • Stretching method: The pre-processed round pipe is placed on a stretching machine and its surface is stretched into a threaded shape by using the stretching force of the machine.
  • Extrusion method: The round tube before processing is placed on an extrusion machine, and its surface is extruded into a threaded shape using the machine’s extrusion force.

No matter which processing method is used, the necessary processing process control and quality inspection are required to ensure that the accuracy and quality of the threaded pipe meet the requirements.

Applications of threaded tubes

Where are threaded tubes used? The following are some common applications for threaded pipe.

  • Oil and Gas Industry: Threaded pipe is the standard pipe material for oil wells, natural gas wells, and other oil and gas industry applications. In these applications, threaded pipe is used to transport oil and gas, as well as to connect and support wellbores in drilling and oil recovery operations.
  • Water treatment and water supply systems: Threaded pipe is used in water treatment and water supply systems to connect equipment such as pipes, filters, pumps and valves. Threaded pipe has corrosion resistance and high pressure carrying capacity, making it suitable for use in water treatment and water supply systems.
  • Construction industry: Threaded pipes are often used in the construction industry to connect pipelines, heating systems, air conditioning systems, fire-fighting systems, etc. Threaded pipe has the characteristics of easy connection, strong structure and high reliability, which can meet various needs of the construction industry.
  • Chemical industry: Threaded pipes are often used in the chemical industry to transport various chemicals, liquids and gases. Threaded pipes can be selected in different materials and specifications according to the characteristics of chemicals to ensure safe and effective transportation.
  • Power industry: Threaded pipe is used in the power industry to connect transmission lines, transformers, generators and other equipment. Threaded pipe has excellent mechanical and seismic properties to meet the needs of the power industry.

How do you know if your pipe is threaded?

To determine if a pipe is threaded, the following steps can be followed.
Observe the appearance of the pipe: Usually, pipes with threads will have a distinctive spiral pattern in their appearance. These spiral patterns are usually rotated along the surface of the pipe, forming a spiral-like shape.
Touch the surface of the pipe: If the pipe has threads on the surface, you will usually feel distinct bumps and grooves. Conversely, if the pipe surface is smooth, there may be no threads.
Look for pipe markings: Some pipes may have their thread type and size marked on the surface, which can help you determine if the pipe has threads.
Use a thread gauge to measure: If you are still unsure if a pipe has threads, you can use a thread gauge to measure it. A thread gauge is a tool specifically designed to measure threads and can help you determine if a pipe has threads and the type and size of threads it has.
It is important to note that if you are unsure of your ability to do this, do not handle the pipe yourself and should seek professional help to avoid any danger.

How many threads does a pipe have?

The number of threads on a pipe depends on the size and length of the threads on the pipe. Usually, a pipe will have threads on one or both ends to allow for the connection of other pipes or fittings. The thread size can vary depending on the use of the tube and the application scenario, so the number of threads on each tube may be different. If you know the thread size and length of the tube, you can calculate the number of threads on the tube.

How to choose the right threaded pipe manufacturer?

Choosing the right threaded pipe manufacturer will ensure that you get a high quality, compliant, durable and reliable threaded pipe product. Here are some guidelines.

  • Know your needs: Before choosing a threaded pipe manufacturer, you need to be clear about the specifications, materials, quantity, delivery time and environment in which you need the threaded pipe.
  • Quality standards: Make sure the manufacturer’s products meet the relevant quality standards in your area, such as ISO, ASME, API, etc.
  • Ability to supply: Select a capable and experienced supplier who can meet your needs and deliver on time.
  • Price and payment terms: Price is one of the important considerations in choosing a supplier, but it should not be the only factor. You also need to know the manufacturer’s payment terms and return policy.
  • History and reputation: Before choosing a supplier, it is advisable to check their history and reputation. You can seek advice from other customers or refer to the manufacturer’s customer reviews.
  • Technical support: Choose a supplier that is capable of providing technical support and problem solving so that you can get timely help when problems arise during use.
  • Production equipment and technology: Choose a manufacturer with modern production equipment and technology that can guarantee the quality and efficiency of production.
  • Service and support: Choose a manufacturer with good service and support that can solve your problems and needs in a timely manner, and provide services such as technical advice and training.

Choosing a threaded pipe manufacturer that meets your needs, has quality assurance, has production capabilities, has a good track record, and offers comprehensive support will provide you with reliable products and services while helping you improve production efficiency and reduce costs.

How do I choose the right threaded pipe?

Choosing the right threaded pipe requires consideration of several factors.

  • Material: The material chosen for threaded pipe depends on the environment and requirements of its use. Different materials have different levels of corrosion resistance, strength and rigidity. For example, for high temperature and high pressure applications, stainless steel is a common choice, while for some low pressure applications, plastic tubing may be more appropriate.
  • Size: Choosing the right size of threaded pipe requires consideration of the fluid flow and pressure within the pipe. The higher the flow rate, the larger the pipe size needed. When selecting threaded pipe, you need to pay attention to the inside and outside diameter of the pipe.
  • Thread type: Common thread types include NPT, BSP and UNF. The selection of thread type needs to be determined by how the pipe is to be connected and what the application requires. For example, NPT threads are typically used for low pressure applications, while BSP threads are used for high pressure applications.
  • Connection type: Depending on how the pipe is to be connected, the appropriate threaded pipe needs to be selected. For example, for pipes that need to be disassembled, a threaded fitting is usually used, while for pipes that need to be fixed, a flange connection can be used.
  • Application environment: When choosing a threaded pipe, you also need to consider the application environment, such as the presence of corrosion, high temperature, high pressure and other factors, and you need to choose a threaded pipe with the appropriate characteristics. It is also necessary to consider factors such as the service life of the pipe and maintenance costs.

Choosing the right threaded pipe requires a combination of factors, including material, size, thread type, connection method and application environment. The right choice needs to be determined on a case-by-case basis.

How to detect threaded pipe?

Threaded pipes are usually pipes used for liquid or gas transport and are connected by threads that are screwed into each other. To ensure the quality and safety of threaded pipe connections, testing is required. The following are some common inspection methods.

  • Visual inspection: You can observe with the naked eye whether the surface of the threaded pipe is flat, whether the threads are clear, and whether there are cracks, wear and tear.
  • Touch inspection: You can touch the surface of the threaded pipe with your fingers to check if there are any problems such as bumps, gaps, burrs, etc.
  • Gauge inspection: Use gauges (such as calipers, vernier calipers, etc.) to measure the diameter, length, pitch and other parameters of the threaded pipe to check if it meets the requirements.
  • Magnetic powder inspection: Using a magnetic powder detector, magnetic powder is scattered on the surface of the threaded pipe to observe whether there is a concentration of magnetic powder to detect defects such as cracks.
  • Acoustic wave inspection: Using an acoustic wave inspection instrument, acoustic wave detection is performed on the threaded pipe to observe whether there are cracks, bubbles and other problems.
  • X-ray inspection: Using an X-ray inspection instrument, the threaded pipe is X-ray detected to observe whether there are defects, foreign objects and other problems.

The above are several common threaded pipe inspection methods, the specific choice of which method should be selected according to the actual situation.

How do I place an order for threaded pipe?

The steps to place an order for threaded pipe are as follows:

  • 1. Determine the specifications: Determine the specifications of the threaded pipe to be purchased, including pipe diameter, wall thickness, material, etc.
  • 2. Choose a supplier: Select a reliable supplier according to your needs and actual situation. You can determine the supplier through internet search or recommendation.
  • 3. Request for quotation: Contact the supplier and ask about the price, delivery time, shipping method and other related information of the threaded pipe.
  • 4. Negotiation: After understanding the supplier’s offer and service, you can negotiate with the supplier on details such as price and delivery conditions.
  • 5. Sign the contract: If both sides agree, you can sign a contract to ensure the rights and interests of both sides.
  • 6. Payment: Payment will be made according to the contracted payment method and time.
  • 7. Arrange transportation: After the supplier sends out the goods, the buyer needs to arrange the mode and time of transportation and notify the supplier in time.
  • 8. Acceptance: After receiving the goods, the goods need to be inspected and accepted to ensure that the quality and specifications meet the contract requirements.

Before placing the order, you need to determine the requirements and contract details and negotiate with reliable suppliers, sign the contract, make payment, arrange transportation and accept the goods.

Source: China Threaded Pipes Manufacturer – Yaang Pipe Industry Co., Limited (www.epowermetals.com)

If you want to have more information about the article or you want to share your opinion with us, contact us at [email protected]

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