Flanges

At Grupo Almagro Mur, we specialise in the supply of industrial flanges, essential components for guaranteeing the integrity, safety and efficiency of any piping system. Our range of flanges, manufactured in top-quality materials such as stainless steel (AISI 304L and 316L) and ductile iron, offers robust solutions for the most demanding sectors, from water supply and drainage to petrochemical applications. Each piece complies with the strictest European and international standards, ensuring exceptional performance and a leak-proof connection under high-pressure and high-temperature conditions.

Our range of industrial flanges

• Stainless Steel Flanges: Maximum corrosion resistance for aggressive environments.

• Ductile Iron Flanges: Robustness and durability for water and drainage networks.

• Welding Neck Flanges: The definitive solution for high pressure and critical temperatures.

• Slip-On Flanges: Easy installation and an economical option for low pressure.

• Blind Flanges: For the secure closure of lines, maintenance and pressure testing.

• Threaded Flanges: Reliable jointing in installations where welding is not an option.

Technical guide to flange selection

The correct choice of flange is critical to the safety and longevity of an installation. Below we detail the main types and most common materials to help you make an informed decision.

Types of flange: Solutions for every application

• Welding Neck Flanges (WN): They are joined to the pipe with a butt weld that transfers stresses and reduces stress concentration. Their long tapered neck makes them the preferred option for high-pressure, extreme-temperature and critical-fluid applications.

• Slip-On Flanges (SO): They slide over the pipe and are secured with two fillet welds. Their installation cost is lower, making them suitable for low-pressure services and less demanding applications.

• Blind Flanges (BL): These are solid discs without a bore used to close the ends of piping systems, valves or vessels. They are essential for pressure testing and for isolating sections during maintenance.

• Threaded Flanges (TH): They are joined to the pipe by a thread, eliminating the need for welding. They are ideal for small-diameter pipes in low-pressure services and in explosive areas where welding presents a risk.

• Lap Joint Flanges (LJ): They are used with a stub end welded to the pipe. The flange remains loose, allowing it to be rotated to align the bolts easily. They are an excellent solution for systems requiring frequent dismantling.

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Material selection: Guaranteed performance

• Stainless Steel (AISI 304 / 316): The preferred choice for its high corrosion resistance.

• AISI 304: Versatile and cost-effective, with excellent resistance in most environments, such as the food industry or potable water systems.

• AISI 316: The superior choice for marine environments or where chlorides or aggressive chemicals are present. Its molybdenum content gives it significantly greater resistance to pitting corrosion.

• Ductile Iron: Offers an excellent combination of mechanical strength and corrosion resistance. It is the standard material for water supply and drainage networks thanks to its durability and competitive cost, and usually has an epoxy coating for additional protection.

Industrial Applications

Our range of flanges offers solutions for a wide variety of sectors:

• Water Supply and Treatment: Ductile iron and 304L stainless steel flanges for potable water networks, pumping stations and treatment plants.

• Petrochemical and Energy Industry: Carbon and alloy steel flanges for transporting fluids and gases at high pressure and temperature.

• Food and Pharmaceutical Industry: 304L and 316L stainless steel flanges that provide a hygienic, non-reactive surface.

• Marine and Offshore Applications: The superior resistance of 316 stainless steel makes it the material of choice for shipbuilding, oil platforms and desalination plants.

Commitment to quality and standards

At Grupo Almagro Mur, quality is a guarantee. All our flanges are manufactured and inspected to meet or exceed the most important standards in the sector:

• UNE-EN 1092-1: The European reference standard for flanges and their joints.

• ASME B16.5 and B16.47: Globally recognised American standards that define pressure classes.

• ISO 9001: Our commitment to a certified quality management system.

Frequently Asked Questions (FAQ)

• What is a flange? It is a component that joins elements of a piping system (pipes, valves, pumps) to create a secure, demountable connection that facilitates maintenance and inspection without cutting the pipe.

• What does the pressure class (e.g. 150#) mean? It is a standard designation (ASME standard) that indicates a flange's ability to withstand pressure at a specific temperature. The higher the class number, the greater the resistance.

• When should a raised face (RF) flange be used? The raised face is the most common type. It concentrates the bolt pressure on a smaller area, creating a more effective seal. It is recommended for most industrial applications.

• Can threaded flanges be welded? No. Their main advantage is that they avoid welding. Welding a threaded flange can damage the threads and compromise the integrity of the connection.

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