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What are the different flange standards?
STANDARD FLANGE CLASSIFICATION. The most common flanges pressure classes are #150, #300, #600, #900, #1500, #2500 and #3000 according to ASME designation. To other standards, as DIN, pressure classes are defined by the acronym PN, as for example, PN10, PN16, PN20, PN25, PN40, PN50, PN100, PN150, PN250 or PN420.
How do I choose a flange?
Guidelines for Selection of Various Types of Flanges
- Pressure Temperature Rating of Flanges.
- Flange Dimensional Standards.
- Flange Facings.
- The bore of Welding Neck Flanges and Hub Design.
- Flange Material Limitations.
- Iron Flanges.
- Carbon Steel Flanges.
- Low and Intermediate Alloy Steel Flanges.
What is the correct function of flange?
A flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. Flanges are usually welded or screwed. Flanged joints are made by bolting together two flanges with a gasket between them to provide a seal.
What are the two main types of flanges available?
We usually consider two main families of flanges, the standard flanges and the special ones.
What is the difference between DIN and ANSI flanges?
The Difference Between ANSI and DIN DIN is most commonly specified in European countries, while ANSI is usually specified in the United States. DIN standards use metric measurements (mm and bar) to measure the valve and flange sizes and pressures.
What is RF in flange?
The Raised Face flange is the most common type used in process plant applications, and is easily to identify. The purpose of a RF flange is to concentrate more pressure on a smaller gasket area and thereby increase the pressure containment capability of the joint.
How do you determine flange pressure rating?
Pressure Rating Designation The Pressure Rating for flanges will be given in Classes. Class, followed by a dimensionless number, is the designation for pressure-temperature ratings as follows: Class 150 300 400 600 900 1500 2500. Different names are used to indicate a Pressure Class.
What is flange mounting?
Flange Mount Bearings are bearing units contained inside a housing unit. The housing provides a rigid and secure position while allowing the bearing unit to rotate within a clean, contained environment. Housed bearings are most commonly used in light duty applications.
How many different flanges are there?
As already described before, the most used flange types ASME B16. 5 are: Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type, completed with an detailed image.
What does PN stand for on flanges?
Pressure Nominale
‘PN’ stands for Pressure Nominale and prefixes the pressure rating, e.g. a PN16 flange is designed to operate up to 16 bar. Typical ratings include PN6, PN10, PN16, PN25, PN40, PN64, PN100. The American ANSI standard refers instead to a pressure / temperature rating termed ‘Class’.
What is the difference between ISO and DIN standards?
DIN standards are still valid for products having no ISO or EN standards. According to the task and aim of the ISO founded in 1946, international standards (ISO) are supposed to standardize technical regulations worldwide and make it easier to exchange goods and reduce trade barriers.
Do you need to specify the raised face of a flange?
The raised face (RF) does not need to be specified, because ASME B16.5, each flange is standard delivered with a raised face. Only a different design (Ring Type Joint (RTJ), Flat Face (FF) etc.), should be specified.
Which is the ANSI standard for pipe flanges?
ANSI B16.5 ANSI B16.5 -1996 is the official standard for ANSI Class Pipe Flanges and Flanged Fittings, applied specifically to those made from cast or forged materials, as well as blind flanges and some reducing flanges crafted in cast, forged, or plate.
What are the different types of flange faces?
Flange Faces. 1 Raised Face height. For the height measures H and B of all described dimensions of flanges on this website, with exception of the Lap Joint flange, it 2 Flat Face (FF) 3 Ring-Type Joint (RTJ) 4 Ring Type Joint gaskets.
What do you need to know about lap joint flanges?
Featuring a two-piece design, lap joint flanges require butt welding of the stub end to the pipe or fitting with the use of a backing flange to create the flanged connection. This design makes this style popular for use in systems with limited physical space or systems which require frequent dismantling and maintenance.