Can welded steel pipes be used for pipe connections on the tower?

The standard for welded steel pipes is GB3091, while more seamless steel pipes are GB8163. Their specifications are different, such as DN40, seamless is φ45, and welding is φ48. The materials are also different, seamless 10 and 20 steel, while welded steel is Q235. The wall thickness of welded steel pipes is not as uniform as seamless steel pipes, so it depends on the use conditions before deciding which steel pipe to choose.

Choose whether to use seamless steel pipes or welded pipes based on the design conditions and project regulations. Basically, the project regulations are all prepared, and the average designer just needs to obey the project regulations!

Seamed steel pipes are called welded pipes, which are divided into: Straight seam welded pipe, spiral welded pipe. 1. Classification of pipes 1. Classification by production method (1) Seamless pipes - hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, extruded pipes, jacked pipes (2) Welded pipes (a) By process - arc welded pipes, resistance welded pipes (high frequency, low frequency), gas welded pipes, furnace welded pipes (b) By welds - straight seam welded pipes, spiral welded pipes 2. Classification by cross-sectional shape (1) Brief Single-section steel pipes - round steel pipes, square steel pipes, oval steel pipes, triangular steel pipes, hexagonal steel pipes, diamond-shaped steel pipes, octagonal steel pipes, semi-circular steel pipes, others (2) Complex cross-section steel pipes - unequal hexagonal steel pipes, five-petal plum blossom-shaped steel pipes, double-convex steel pipes, double-concave steel pipes, melon-shaped steel pipes, conical steel pipes, corrugated steel pipes, Case steel pipes, others 3. Classified by wall thickness - thin-walled steel pipes, thick-walled steel pipes 4. Classified by use - steel pipes for pipelines, steel pipes for thermal equipment, steel pipes for the mechanical industry, steel pipes for petroleum, geological drilling, container steel pipes, steel pipes for the chemical industry, special purpose steel pipes, others 2. Seamless steel pipes are long steel pipes with hollow sections and no seams around them. Steel pipes have hollow sections and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, coal gas, water and certain solid materials. Compared with solid steel materials such as round steel, steel pipes are lighter in weight when the bending and torsional strength is the same. It is an economical cross-section steel and is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Using steel pipes to manufacture ring-shaped parts can improve material utilization, simplify the manufacturing process, and save materials and processing time, such as rolling bearing rings, jack sets, etc., which are now widely manufactured with steel pipes. Steel pipes are also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. are all made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to different cross-sectional area shapes. Since the circle area is the largest when the circumferences are equal, more fluid can be transported with circular tubes. In addition, the circular cross section is relatively uniformly stressed when subjected to internal or external radial pressure. Therefore, the vast majority of steel pipes are round pipes. However, round tubes also have certain limitations. For example, under the condition of plane bending, round tubes are not as strong as square and rectangular tubes in bending strength. Square and rectangular tubes are commonly used in some agricultural machinery frames, steel and wood furniture, etc. Special-shaped steel pipes with other cross-sectional shapes are also required according to different uses. 1. Structural seamless steel pipe (GB/T8162-1999) is a seamless steel pipe used for general structures and mechanical structures. 2. Seamless steel pipes for fluid transportation (GB/T8163-1999) are general seamless steel pipes used to transport fluids such as water, oil, and gas. 3. Seamless steel pipes for low and medium pressure boilers (GB3087-1999) are high-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes used to manufacture superheated steam pipes, boiling water pipes for low and medium-pressure boilers of various structures, superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arch brick pipes. 4. Seamless steel pipes for high-pressure boilers (GB5310-1995) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes used for the heating surfaces of water tube boilers with high pressures and above. 5. High-pressure seamless steel pipe for fertilizer equipment (GB6479-86) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with working temperatures of -40~400℃ and working pressures of 10~30Ma. 6. Seamless steel pipe for petroleum cracking (GB9948-88) is a seamless steel pipe suitable for furnace tubes, heat exchangers and pipelines in petroleum refineries. 7. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling. They can be divided into drill pipes, drill collars, core pipes, casings and sedimentation pipes according to their uses. 8. Seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe used for drill pipe, core rod and casing for diamond core drilling. 9. Oil drilling pipe (YB528-65) is a seamless steel pipe with internal or external thickening at both ends used for oil drilling. There are two types of steel pipes: wired and unthreaded. Threaded pipes are connected with joints, while non-threaded pipes are connected with tool joints by butt welding. 10. Carbon steel seamless steel pipes for ships (GB5213-85) are carbon steel seamless steel pipes used in manufacturing ships’ Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450°C, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450°C. 11. Seamless steel pipe for automobile half-shaft casing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used for manufacturing automobile half-shaft casings and drive axle housing shaft tubes. 12. High-pressure oil pipe for diesel engine (GB3093-86) is a cold-drawn seamless steel pipe used to manufacture high-pressure pipes for diesel engine injection systems. 13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold-drawn or cold-rolled precision seamless steel pipe with precise inner diameter for manufacturing hydraulic and pneumatic cylinders. 14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish used in mechanical structures and hydraulic equipment. Precision seamless steel pipes can be used to manufacture mechanical structures or hydraulic equipment, etc. * * Save machining hours, improve material utilization, and at the same time help improve product quality. 15. Stainless steel seamless steel pipes for structural use (GB/T14975-1994) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipes made of stainless steel that are widely used in corrosion-resistant pipes and structural parts and parts in the chemical, petroleum, textile, medical, food, machinery and other industries. 16. Stainless steel seamless steel pipes for fluid transportation (GB/T14976-1994) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipes made of stainless steel used to transport fluids. 17. Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes except round pipes. According to the different cross-sectional shape and size of the steel pipe, it can be divided into special-shaped seamless steel pipes with equal wall thickness (codenamed D), special-shaped seamless steel pipes with unequal wall thickness (codenamed BD), and variable-diameter special-shaped seamless steel pipes (codenamed BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with round pipes, special-shaped pipes generally have a larger moment of inertia and section modulus, and have greater bending and torsion resistance. * * Reduce structural weight and save steel. 3. Welded steel pipe Welded steel pipe, also called welded pipe, is a steel pipe made of steel plates or steel strips that are welded after being curled and formed. The production process of welded steel pipes is simple, the production efficiency is high, there are many varieties and specifications, and the equipment capital is small, but the general strength is lower than that of seamless steel pipes. Since the 1930s, with the rapid development of continuous rolling production of high-quality strip steel and the advancement of welding and inspection technology, the quality of welds has continued to improve, and the varieties and specifications of welded steel pipes have increased day by day, replacing seamless steel pipes in more and more fields. Welded steel pipes are divided into straight seam welded pipes and spiral welded pipes according to the form of the weld. The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is rapid. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produced from narrower billets, and welded pipes with different diameters can also be produced from billets of the same width. However, compared with straight seam pipes of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter welded pipes mostly use spiral welding. 1. Welded steel pipes for low-pressure fluid transportation (GB/T3092-1993) are also called general welded pipes, commonly known as black pipes. It is a welded steel pipe used to transport water, gas, air, oil, heating steam and other general lower pressure fluids and other purposes. The wall thickness of steel pipes is divided into ordinary steel pipes and thickened steel pipes ； The form of the connecting end is divided into unthreaded steel pipe (plain pipe) and threaded steel pipe. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. * It is customary to express it in inches, such as 11/2, etc. In addition to being directly used to transport fluids, welded steel pipes for low-pressure fluid transportation are also widely used as the original pipes for galvanized welded steel pipes for low-pressure fluid transportation. 2. Galvanized welded steel pipe for low-pressure fluid transportation (GB/T3091-1993) is also called galvanized electric welded steel pipe, commonly known as white pipe. It is a hot-dip galvanized welded (furnace welded or electric welded) steel pipe used to transport water, gas, air oil, heating steam, warm water and other general lower pressure fluids or other purposes. The wall thickness of steel pipes is divided into ordinary galvanized steel pipes and thickened galvanized steel pipes. ； The form of the connecting end is divided into unthreaded galvanized steel pipe and threaded galvanized steel pipe. The specifications of steel pipes are expressed in nominal diameter (mm), which is an approximate value of the inner diameter. * It is customary to express it in inches, such as 11/2, etc. 3. Ordinary carbon steel wire casing (GB3640-88) is a steel pipe used to protect wires in electrical installation projects such as industrial and civil buildings and installation of machinery and equipment. 4. Straight seam electric welded steel pipe (YB242-63) is a steel pipe with the weld seam parallel to the longitudinal direction of the steel pipe. Usually divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc. 5. Spiral seam submerged arc welded steel pipe for pressure-bearing fluid transportation (SY5036-83) is a spiral seam steel pipe used for pressure-bearing fluid transportation. It is made of hot-rolled steel strip coils as pipe blanks, spirally formed at constant temperature, and welded by double-sided submerged arc welding. Steel pipes have strong pressure-bearing capacity and good welding performance. They have undergone various rigorous scientific inspections and tests and are safe and reliable to use. The steel pipe has a large diameter, high transportation efficiency, and can save investment in laying pipelines. Mainly used for pipelines transporting oil and natural gas. 6. Spiral seam high-frequency welded steel pipe for pressure-bearing fluid transportation (SY5038-83) is a spiral seam high-frequency welded steel pipe used for pressure-bearing fluid transportation. It is made of hot-rolled steel strip coils as pipe blanks, spirally formed at constant temperature, and welded by high-frequency lap welding. Steel pipes have strong pressure bearing capacity, good plasticity, and are easy to weld and process. ； After various rigorous and scientific inspections and tests, it is safe and reliable to use. The steel pipe has a large diameter, high transportation efficiency, and can save investment in laying pipelines. Mainly used for laying pipelines transporting oil, natural gas, etc. 7. Spiral submerged arc welded steel pipes for general low-pressure fluid transportation (SY5037-83) are made of hot-rolled steel strip coils as pipe blanks, spirally formed at constant temperature, and made by double-sided automatic submerged arc welding or single-sided welding methods. They are used for general low-pressure fluid transportation such as water, gas, air, and steam. Submerged arc welded steel pipes. 8. Spiral seam high-frequency welded steel pipes for general low-pressure fluid transportation (SY5039-83) are made of hot-rolled steel strip coils as pipe blanks. They are spirally formed at constant temperature and welded by high-frequency lap welding. They are used for spiral seam high-frequency welded steel pipes for general low-pressure fluid transportation. 9. Spiral welded steel pipe for piles (SY5040-83) is made of hot-rolled steel strip coils as tube blanks, which are often heated and spirally formed, and made by double-sided submerged arc welding or high-frequency welding. It is used for steel pipes for foundation piles in civil building structures, docks, bridges, etc.

20R is also used as a plate for containers. As long as the plate thickness is sufficient, there is no corrosion, and the weld quality is good, welded steel pipes can also be used.

That depends on the size of the takeover. Since it is highly hazardous, as long as the welding joint coefficient of the welded pipe can be ensured to be 1. You can use GB150, which only stipulates the scope of use of austenitic stainless steel welded pipes. As an aside, I have always bothered to use "Baidu" to answer questions that are not asked. It is even more incomprehensible to give a heavy reward.

The conditions are incomplete and contradictory. 1. As a pressure vessel, except for large-diameter pipes that can be plate coils and calculated according to pressure-bearing cylinders, the other pipes must be made of seamless steel pipes. None of the standards cited in GB150 are for welded pipes. 2. Since it is a highly hazardous medium, it should be classified according to Article 6 of the regulations. It should be classified as Category II at least, which falls under the jurisdiction of the regulations and GB150, and can be determined as a pressure vessel.