Flanged Pipe
Flanged pipe is a type of pipe that has a flange at one or both ends. The flange end is connected to another flange from another pipe, valve, or other equipment by bolts. Then achieve the connection between pipes , pipe fittings ,valves etc pipe parts. The connection between flanges is rigid ,no movement or angle deflection is allowable. But the flange allows for easy assembly and disassembly of the pipe sections, providing a strong and leak-proof connection. Flanged pipes are commonly used in plumbing, industrial applications, and various types of fluid and gas transportation systems. They are particularly useful in situations where pipes need to be frequently connected and disconnected or where maintenance is required.
Flanged pipe mainly include steel flanges pipes and ductile iron flanged pipe. Judberd is competitive manufacturer for ductile iron flanged pipe , so we take ductile iron flanged pipes as examples.
Flanged pipes Types
According to the flanges quantity
Flanged pipe include double flanged pipe, flange spigot pipe ,flanged pipe with puddle ，If you need double flanged pipe, you need to specify the flanged pipe length (the total length from one flange face to the other flange face, the flange design standard and working pressure PN value), If you need flange spigot pipe, you need to specify the flanged pipe length (the total length from one flange face to the other spigot end), the flange design standard and PN value, If you need flanged pipe with puddle, you need to determine if it is one flange pipe with puddle or double flanged pipe with puddle, the total length of the flanged pipe, the puddle flange position(like 1 meter from flange end), the working pressure PN value. The working pressure PN value not only indicates the working pressure of the pipe, it also indicates the PN value the flange dimensions should follow.
Double flanged pipe
Flange spigot pipe
Double flanged pipe with puddle
According to Production Method
The production method of flanged pipe includes integral casting (applicable to flanged pipes with an overall length less than or equal to 1.5m), welding (applicable to flanged pipes with an overall length greater than 1.5m) and thread connection. Among them, the wall thickness of the flanged pipe of integral casting is grade K12, and the wall thickness of the welding flanged pipe is grade K9. The welding flanged pipe is cut to the appropriate length with a 6m long socket spigot pipe, and then welded at both ends, and the cast metal flange is welded by welding rod. Please note that the ductile iron flanged pipe is different from the steel flanged pipe. The ductile iron flanged pipe is usually used for water transportation pipeline, and the surface needs to be coated with an anti-corrosion coating. The welding will destroy the anti-corrosion coating on the surface. Therefore, the ductile iron flanged pipe is usually welded by the manufacturer first, and then the surface is coated with an anti-corrosion coating. The steel flanged pipe can be welded by the user when installing the pipe. The thread-connected flanged pipe is not usually used because the production process is complex and the installation is time consuming (unless the customer has special requirements).
Threaded Flange
Integral casted pipe flange
Welded Pipe Flange
Flanged pipes Connection
Flanged pipes connection is a type of rigid joint used in piping systems to connect pipes, valves, pumps, and other equipment. It consists of flanges, bolts, nuts, and a gasket to ensure a tight seal. The flanges are typically integrally casted, welded or screwed onto the pipe ends. The gasket is placed between the two flanges, and the bolts are tightened to secure the connection, ensuring a leak-proof seal.Flanged connections are commonly used in industrial, commercial, and residential piping systems due to their ability to be easily assembled and disassembled for maintenance or repair.
In water pipeline system, there have 2 types pipe connection .One is socket and spigot connection, another is flanged pipe connection. Compare to socket and spigot connection ,
Flanged Joint offer strength, durability, and ease of maintenance, making them suitable for high-pressure and high-temperature applications. They are ideal for systems that require frequent disassembly and inspection but come with higher costs and space requirements, it is suitable for above-ground pipeline.
Push on Joint provide flexibility, ease of installation, and cost-effectiveness, making them suitable for low to moderate pressure systems where some degree of movement or flexibility is beneficial, it is suitable for underground pipeline.
Selecting the appropriate connection method depends on the specific requirements of the piping system, including pressure, temperature, flexibility, maintenance needs, above-ground pipeline or underground pipeline.
Mechanical Joint Connections
Typically consists of a gland (follower ring), a gasket, and bolts. The pipe is inserted into a bell or coupling, and the gland is used to compress the gasket to create a seal.Often used with ductile iron pipes and fittings, but can also be used with other materials like PVC. It is quicker and easier to install compared to flanged connections, often requiring fewer tools and less skill.It Can accommodate some degree of misalignment, thermal expansion, and ground movement, reducing the risk of leaks.Generally lower initial cost compared to flanged connections, especially for smaller diameters and lower pressure applications.The gasket provides a good seal, effectively preventing leaks.Typically suitable for low to moderate pressure systems; not ideal for high-pressure applications.Less robust compared to flanged connections in high-pressure and high-temperature environments.May require periodic tightening to maintain the seal over time.
Flanged pipe used in water pipeline system
Easy to Install and Maintain
Flanges are easy to install because they are either pre-welded or threaded onto the ends of the pipe. This makes it easy to connect the pipes together, especially in complex pipeline systems. For water pipelines, it makes maintenance easy. If you need to inspect, repair, or replace something, you can unbolt the flanges and service the components without having to take the entire pipeline apart.Suitable for Large Diameter and High-Pressure Pipes
Flanges can handle higher pressure and temperature, which makes them ideal for large diameter or high-pressure pipelines. In a water pipeline, flanges make sure the system stays strong and leak-free even when the pressure is high by using the right size and material for the flanges.Good Sealing
In water pipelines, it’s important to keep a tight seal to prevent leaks. Flanges have great sealing capability. The gasket between the flanges creates a good barrier that keeps water from leaking out and contaminants from getting into the pipeline. This is especially important in high-pressure systems or when you’re moving dirty or corrosive water.Flexible Design and Customization
Flanges can be customized to meet your specific needs. For water pipelines, you can choose the right type of flange and material (e.g., stainless steel, carbon steel, or ductile iron) based on things like the pressure requirements, the environment, and the quality of the water. This flexibility allows you to design the system to meet your specific needs.Easy to Replace and Expand
Flanges make it easy to expand the pipeline or replace components. If you need to add to the pipeline or add more valves or filters, you can quickly connect or disconnect flanged pipes. This flexibility is great for water pipeline systems that might need to be upgraded or adjusted in the future.Corrosion Resistance and Adaptability
Water pipelines have to deal with a lot of different environmental conditions, and flanges can be designed with materials that resist corrosion, like stainless steel , coated ductile iron or carbon steel. This ensures that the system will last longer and continue to work properly, even in tough environments (e.g., water that’s salty or has a lot of chemicals in it).
Ductile iron flanged pipe
Ductile iron flanged pipe
How to Choose Right Flanged Pipe?
When choosing the right flanged pipe for your project, you need to consider a few things like the type of fluid you’re moving, the pressure you’re under, the temperature you’re dealing with, the environment you’re in, and how much corrosion resistance you need. Different materials like ductile iron, carbon steel, and stainless steel have different properties that make them good for different applications, including potable water, wastewater, and seawater systems. Below, I’ll show you how to pick the right material for drinking water, wastewater, and seawater or corrosive fluids, and I’ll talk about what you need to think about when it comes to the fluid, the pressure, and the environment.
1.Drinking Water Systems (Potable Water)
When you’re moving drinking water through a pipeline, you need a material that’s safe, clean, resistant to corrosion, and reliable over the long term. The material has to meet health standards to make sure the water doesn’t get contaminated and stays safe to drink.
Recommended Materials:
Ductile Iron: Ductile iron is used a lot for potable water pipelines when it’s coated correctly. It’s strong and flexible, but you need to protect the surface to make sure it doesn’t contaminate the water.
Stainless Steel (SS304 or SS316): Stainless steel is a great choice for potable water systems because it resists corrosion, doesn’t react with the water, and keeps the water clean. SS304 is good for general water distribution, while SS316 is better for places where the water is more corrosive, like near the ocean.
Surface Treatment:
Epoxy Coating: For ductile iron and carbon steel pipes, an epoxy coating is put on the pipe surface to keep the pipe from corroding and contaminating the water.
Cement inside ,zinc and bitumen outside according to EN545/ISO2531
Polishing or Electro-polishing (for stainless steel): Stainless steel can be polished to make the surface smoother and keep bacteria from growing on it.
Considerations:
Non-toxic: The material can’t leach harmful stuff into the water.
Corrosion Resistance: Drinking water can corrode things, especially if it’s underground or wet.
Pressure Requirements: Drinking water systems usually work under medium pressure, so you need to pick a material that meets the right pressure and temperature standards.
2. Wastewater Systems (Sewage)
Wastewater pipes carry sewage, which can be corrosive, abrasive, and have solid stuff in it, so you need a material that resists corrosion and lasts a long time.
Recommended Materials:
Ductile Iron: Ductile iron is used a lot for sewage and wastewater systems because it’s strong, durable, and can take a hit. It’s usually coated on the inside with epoxy or High-alumina cement according to EN598 to keep it from corroding.
Carbon Steel: Carbon steel is another common material for sewage pipes. It’s cheap and strong, but you have to coat it to keep it from corroding, especially in places where the water is mean.
HDPE (High-Density Polyethylene): In some special cases, HDPE is used because it resists corrosion and is flexible.
Considerations:
Chemical Resistance: Wastewater has a lot of different chemicals in it that can corrode materials that aren’t protected, so you need something that resists corrosion really well.
Pressure and Flow Rate: Wastewater systems usually have higher pressure and move a lot of water, so the materials have to be able to take the pressure.
Abrasion Resistance: Wastewater can have stuff in it that can wear away the pipe, so the material needs to be able to resist getting worn away.
3. Seawater and Corrosive Fluids (Chemical Exposure)
Seawater and chemicals like acids or bases are really mean to pipes. You need materials that resist corrosion really well to keep the pipes from falling apart over time.
Recommended Materials:
Stainless Steel (SS316 or SS316L): SS316 is the best material for seawater because it resists corrosion from the chloride in seawater. SS316L (low-carbon stainless steel) resists corrosion even better after it’s been welded and is used in really corrosive places.
Aluminum Bronze: Aluminum bronze alloys resist seawater and chemicals really well and are used a lot in marine applications.
Coated Carbon Steel: Sometimes, people use carbon steel pipes for seawater, but they have to be coated with fusion-bonded epoxy or marine-grade coatings to keep them from corroding.
Considerations:
Corrosion Resistance: The most important thing is to protect the pipe from the mean stuff in seawater and chemicals.
Pressure and Temperature: You have to pick materials based on the pressure and temperature you’re dealing with, especially if you’re working under high pressure or at high temperatures.
Long-Term Durability: The material has to be able to take being around the mean stuff like saltwater for a long time.
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