At API International, our commitment to engineered precision, collaborative problem-solving, and rigorous quality assurance helps reduce your total cost of ownership. We streamline manufacturing workflows, eliminate errors, minimize design revisions, and ensure product dependability, delivering integrated solutions that save you time, money, and operational stress.
Common standards include:
Flanges can be welded or screwed on, depending on the type of flange and piping system requirements. When selecting a flange type, some important aspects include pressure capacity, pipe size, and intended application.
AWWA flanges are primarily used in waterworks applications and cover larger size ranges (up to 144″ in diameter) but lower pressure ratings.
ANSI/ASME B16.5 flanges are designed for industrial systems with higher pressure requirements and cover smaller diameters (up to 24″ in diameter).
ANSI / ASME B16.47 flanges cover the remaining sizes from 26”-60” in diameter.
Pressure classes are defined in AWWA as B, D, E, and F for carbon steel and as SA, SB, SD, SE, and SF for stainless steel. In ANSI/ASME pressure classes, the pressure classes are defined as 150, 300, 400, 600, 900, 1500, and 2500.
ASME / ANSI Class 150 and Class 300 are pressure classes that indicate the flange’s allowable pressure capability at a given temperature. In general, Class 300 is rated for higher pressure service than Class 150, and it typically has heavier dimensions (thicker flange, different drilling by size) to support that duty.
To order industrial flanges from API International, share your pipe size, the flange standard and class you need (for example, ANSI/ASME B16.5, AWWA C207, or DIN EN 1092 PN), your facing requirement, and the material or coating requirements. If your project has special requirements like corrosion resistance, high temperature service, sour service, or specific bolt hole drilling, include that as well. Contact API International’s experienced team and we will help you select the right flange for your application from our massive stock inventory or custom machine it.
If you have worked around flanges long enough, you have seen it. Two different suppliers, two flanges made to the same specification, with the same dimensions, tolerances, material, and standard, and still do not look equal when they arrive. One
A “plate flange” describes how a flange is manufactured (cut from plate/flat stock), not a universal dimensional standard. The actual dimensions, bolt-hole patterns, facing details, and pressure/temperature rules come from the standard you specify, such as ANSI/ASME B16.5, AWWA C207,
Plate flanges are fabricated by cutting profiles from flat carbon or stainless steel ASTM specified plate. Subsequently, they are machined to precise specifications, including bolt hole patterns and center bores. While forged flanges are shaped under high pressure or force
We start the process by receiving raw material.When material arrives, it first goes through receiving inspection. Our receiving inspector performs an initial check per the work order, measuring two points on the material to verify callout dimensions. This confirms that
The real issue behind most mismatches Most flange mismatches happen because people assume all flanges are the same. In reality, flanges from different manufacturers can vary in size, pressure rating, material, and bolt hole pattern.To avoid these problems, always double-check
To design a safe and reliable piping system, it is critical to select the appropriate ASME/ANSI flange. Properly chosen flanges must be able to accommodate operating pressure, temperature, mechanical loading, and environmental exposure. On the other hand, if a flange
The primary advantages of ASME/ANSI flanges lie in their rigorous standardization, ensuring seamless interchangeability and compatibility across global piping systems. Designed for robust performance, these flanges maintain structural integrity in extremely high-pressure and high-temperature environments. Beyond their mechanical strength, standardized
1. The simplest way to explain what a flange is A flange is a lip. Try to grab a smooth pipe, and your fingers slide off. When you flare the end of the pipe, you create a small lip you
ANSI/ASME flanges are a foundational component in industrial piping systems, as they provide standardized, pressure-rated connections between pipes, valves, equipment, and vessels. Governed by ASME standards and associated with ANSI, these flanges are used across a wide range of operating
ANSI/ASME B16.5 and B16.47 standards define standardized pressure–temperature limits for flanged piping systems. Each pressure class corresponds to a specific rating that varies based on material group and operating temperature. This article explains these ratings, ranging from Class 150 through
