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.
“API is both very timely and responsive to customers while providing excellent customer service, great quality products, and fostering and maintaining excellent relationships with their customers.”
“Fantastic customer service! API is a great company to work with, their employees are great, and their products are as well!”
“API does a really good job of helping our company and we appreciate the partnership. API has the ability to work with us on special project pricing and lead times.”
“We have been purchasing flanges & fittings from API for over 25 years. Excellent customer service from management to sales staff and timely delivery has helped us to keep our customers happy.”
“API is very quick with quotes and getting back to us on PO status. I have no complaints on my end.”
“Our service experience and company relationship with API has been great. API provides an excellent service experience for their customers.”
“API has been a go to flange supplier for over 20 years. Their extremely fast order processing makes placing and receiving orders seamless.”
“Great customer service. Always a pleasure to work the guys at API. Have been doing business with for 20 years.”
“I am happy with the responsiveness and time frame in which quotes are given. I do not have anything negative to say and think they are doing a good job.”
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
DIN flange pressure ratings are defined through the PN system (e.g., PN10, PN16, PN25) and standardized under EN 1092-1. The standard specifies flange dimensions, bolt patterns, and rating principles for metric piping applications. This article explains the DN/PN designation structure,
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
DIN and ANSI / ASME flanges are governed by two completely different standards systems which are used in piping, mechanical, and industrial engineering. While both of them define flange dimensions, pressure ratings, materials, and tolerances, they are still built on
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
Deutsches Institut für Normung (DIN) is one of the standards organizations that complies with European and International standards. DIN sets industry guidelines for quality assurance and safety, including flange materials requirements and pressure and temperature rating. DIN flanges are widely
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
ANSI/ASME flanges are the primary connection components which are used in industrial piping systems across oil & gas, petrochemical, power generation, water treatment, and mechanical/HVAC applications.ANSI/ASME B16.5 covers NPS ½” to 24” in pressure classes 150 to 2500. Flange types
ANSI/ASME flanges are built specifically for high-pressure piping systems, as they can maintain a reliable seal under demanding conditions. They work by compressing a gasket between two machined flange faces using bolts. This creates a controlled, leak-proof seal that is