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Bent Pipes: The Difference Between Seamless and Welded Types
Release time:
Sep 17,2021
Speaking of pipe elbows, we all know they’re fittings used at pipe bends and account for a significant proportion of all fittings employed in piping systems. The elbows we use every day are seamless elbows. I’m sure many people have this question: What’s the difference between seamless and welded pipe elbows? And how can we tell them apart?
Bent Pipes: The Difference Between Seamless and Welded Types
Speaking of pipe elbows, we all know they’re fittings used at pipe bends and account for a significant proportion of all fittings employed in piping systems. The elbows we use every day are seamless elbows. I’m sure many people have this question: What’s the difference between seamless and welded pipe elbows? And how can we tell them apart?
Bent Pipes: The Difference Between Seamless and Welded Types
1. Different raw materials: Seamless bends are made from seamless pipes, while welded and straight bends refer to welded bends and straight bends, respectively.
2. Different appearances: Welded elbows have two weld seams, straight elbows have one weld seam, and seamless elbows have no weld seams.
3. Different performance characteristics.
Compared to welded elbows, seamless elbows have the following advantages:
(1) Hygienic and non-toxic. This material is composed entirely of carbon and hydrogen, with no toxic heavy-metal salt stabilizers added. The hygienic performance of this material has been verified by tests conducted by a nationally recognized authority.
(2) Lightweight. The density of stamped bent pipes is 0.8–0.91 grams per cubic centimeter, only one-tenth that of steel pipes. Due to their light weight, they can significantly reduce industrial transportation costs and the intensity of installation and construction work.
(3) Good heat resistance. When the operating water temperature is 70°C, the softening temperature of the seamless bent pipe is 140°C.
(4) Excellent corrosion resistance. With the exception of a few hydrogenation agents, it is resistant to various chemical media, acids, alkalis, and corrosive substances; it does not rust, corrode, harbor bacteria, or undergo electrochemical corrosion.
(5) Excellent thermal insulation. Due to the material’s low thermal conductivity—ranging from 0.21 to 0.24 W/m·K at 20°C—which is significantly lower than that of steel pipes and copper pipes, seamless bent pipes exhibit outstanding heat preservation performance.
(6) Excellent impact resistance. Thanks to its unique impact strength, it significantly outperforms other corrugated pipes; its ring stiffness is equivalent to 1.3 times that of corrugated pipes.
(7) Long service life. Under rated temperature and pressure, the pipeline’s service life exceeds 50 years.
4. Different prices: Due to the more complex manufacturing process of seamless elbows, their cost is higher than that of welded elbows. Jointed elbows are primarily made by secondarily welding steel plates (steel strips), making them cheaper and widely applicable.
5. Different Applications: Seamless bent pipes are primarily used as pipelines or structural components for fluid conveyance, with major applications in the machinery industry. Jointed bent pipes are mainly used in the construction industry—for conveying low-pressure fluids such as water, natural gas, and compressed air. It’s worth noting that all pressure pipelines are seamless.
Alloy bends are a general term for various types of pipe bends. Their function is to connect two pipes with the same nominal diameter at pipe bends, enabling pipelines to make 90° turns or turns at other angles. Alloy bends are made from a wide variety of materials and have extremely broad applications.
Ordinary bronze alloy elbows are commonly used in water pipes, but as living standards improve, many water pipes have switched to stainless steel elbows.
You can also learn more about industry trends.
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