As per Wikipedia, there are certain standardised types of flange.

European dimensions (EN / DIN)

Most countries in Europe mainly install flanges according to standard DIN EN 1092-1 (forged stainless or steel flanges). Similar to the ASME flange standard, the EN 1092-1 standard has the basic flange forms, such as weld neck flange, blind flange, lapped flange, threaded flange (thread ISO7-1 instead of NPT), weld on collar, pressed collars, and adapter flange such as flange coupling GD press fittings. The different forms of flanges within the EN 1092-1 (European Norm/Euronorm) is indicated within the flange name through the type.

Design	According to EN type	According to DIN
Weld-neck flange	Type 11	DIN 2627 – DIN 2638
Blind flange	Type 05	DIN 2527
Threaded flange	Type 12	DIN 2558, DIN 2565 – DIN 2569
Flat flange	Type 01	DIN 2573, DIN 2576
Lapped flange	Type 02 and Type 04	DIN 2641, DIN 2642, DIN 2655, DIN 2656

Similar to ASME flanges, EN1092-1 steel and stainless flanges, have several different versions of raised or none raised faces. According to the European form the seals are indicated by different form:

Form: types of contact faces	DIN EN 1092-1
Without raised face	Form A
Raised face (Rz = 160 mechanical turned)	Form B1
Raised race (Rz = 40 mechanical turned)	Form B1
Raised face (Rz = 16 mechanical turned)	Form B2
Tongue according to DIN2512	Form C
Groove according to DIN 2512	Form D
Male according to DIN 2513	Form E
Female according to DIN 2513	Form F
Female according to DIN 2514	Form G
Male according to DIN 2514	Form H

As per https://savree.com/en/encyclopedia/flange-types

There are many different types of piping flange due to the different service conditions in which they operate. Flanges are chosen based on their corrosion resistance properties, erosion resistance properties, pressure temperature rating (Class), number of welds required for attachment, physical size (some flange designs may not fit into the space allowed) and cost. The most common flange types are:

• Welding Neck Flange
• Slip-on Flange
• Socket Weld Flange
• Lap Joint Flange
• Threaded Flange
• Blind Flange

Flange Types

Other flange types many engineers will encounter are the male and female, and tongue and groove types. Less common types include the orifice, expander, reducing, and long welding neck flange designs.

Flange ends may be screwed, welded, or lapped (metal to metal contact) to their associated piping.

Flange Types Overview

Some important information concerning flange types has been compiled into the below table. Although ASME standards are cited in the table, alternative international and national standards are available (DIN, EN etc.). ASME is however the most widely accepted piping standards organisation, and for this reason its standards have been cited.

In the below table, the ‘Faces’ column indicates the usual sealing face chosen per flange type. However, there may be exceptions to the rule depending upon the flange type. The table should be treated as a general overview table, whilst specific information should be sought in relevant standards.

Flange Type	NPS (inch)	ASME Class	Faces	Joint Integrity	Weld	ASME Standards
Welding Neck Flange	All	=	=	High	One butt weld.	B16.5, B31.3
Slip-on Flange	Many	Generally, ≤ 600	FF, RF	Medium	One or two fillet welds.	B16.5, B31.3
Socket Weld Flange	Generally, ≤ ½ to 2. Max ≤ 4	≤ 600	FF, RF	Medium	One fillet weld.	B16.5, B31.3
Lap Joint Ring Flange	Not used for small sizes.	NA	FF	NA	None	B16.5, B31.3
Stub End of Lap Joint Flange		150 to 2500	FF, RF, RTJ	High	One butt weld.	B16.9, B31.3
Threaded Flange	Generally, ≤ ½ to 2. Max ≤ 4	≤ 300	FF, RF	Low	None	B1.20.1, B31.3
Blind Flange	All	=	=	NA	None	B16.5, B31.3

Flange Type Summary Table

Table Key:   FF– flat face.    RF–raised face.    RTJ–ring type joint.

As per https://www.kamleshmetal.com/flanges-faces-types.html

Flange Faces Types

Flange Face -Raised Face

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FLANGE FACES TYPES

The types of flange faces are shown in the following image:

The term “flange facing” refersto the shape of the contact surface that seals the connection between two flanges (the area that seat the gaskets). The ASME B16.5 and ASME B16.47 norms mention different types of flange faces such as:

• flat face (FF)
• raised face (RF)
• lap joint
• male and female (M&F)
• the large and small tongue-and-groove type (T&G)
• ring joint (RTJ)

RTJ, T&G and M&Fflanges should never be coupled, as the contact surfaces of these differently faces flanges would not matchand create leakage of the joint. The considerations about facing typesapply both to carbon steel and stainless steel flanges.

The types offlange facesare shown in the following image:

 

FLAT FACE FLANGE (FF)

Flat Face (FF): The Flat Face flange has a gasket surface in the same plane as the bolting circle face. Applications using flat face flanges are frequently those in which the mating flange or flanged fitting is made from a casting. Flat face flange (FF) have a contact surface at the same height of the bolting line of the flange. FF flanges should never be bolted with RF flanges according to ASME B31.1. Flat face is the most simple type of flange facing available.

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RAISED FACE FLANGE (RF)

Raised Face (RF): The Raised Face flange is the most common type used in process plant applications, and is easily to identify. It is referred to as a raised face because the gasket surfaces are raised above the bolting circle face. This face type allows the use of a wide combination of gasket designs, including flat ring sheet types and metallic composites such as spiral wound and double jacketed types. Raised face flanges (RF flanges) are widely used for oil & gas pipelines and are easy to recognize because the gasket surface is located above the bolting line of the flange. RF face flanges are compatible with a wide range of gaskets, from the flat cut types to the metallic and semi-metallic types (jacketed gaskets and spiral wound gaskets).

The main goal of raised face flanges is to concentrate the contact pressure on a small area of the flange thus increasing the strength of the seal.The height of the raised surface depends on the rating of the flange and is defined by ASME B16.5 (for pressure classes 150 and 300, the height of raised face shall be approx. 1.6 mm (1/16 inch), while, for classes from 400 to 2500, the raised face height shall be approximately 6.4 mm (1/4 inch). The most common flange face finish for ASME B16.5 RF flanges is 125 to 250 micron Ra (3 to 6 micron Ra).

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RING JOINT FLANGES (RTJ)

Ring joint type flanges (RTJ) create a metal to metal seal between the mating flanges and are therefore used in high-pressure (600# and higher) and high-temperature (800 F° and higher) services. RTJ faced flanges have circular grooves that host metallic ring joint gaskets (RTJ type). As the two RTJ flanges are bolted together and tightened, the applied force compresses and deforms the metallic gaskets inside the grooves and creates a very tight metal-to-metal seal (obviously, the material of the ring joint gaskets has to be softer than the material of the flanges).

RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal / oval for the R style). The most common RTJ gasket is the R style with octagonal section, as it ensures a very strong seal (the oval section is an older type, less and less used). The common “flat groove” design, however, accepts both RTJ gaskets with octagonal and oval section.

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TONGUE & GROOVE FLANGES (T&G)

Tongue-and-Groove (T&G): The Tongue and Groove faces of this flanges must be matched. One flange face has a raised ring (Tongue) machined onto the flange face while the mating flange has a matching depression (Groove) machined into it’s face., Two T&G flanges shall be matched one to the other. The male flange has a tongue (which is a raised ring), wherease the female flange has a grrove that match the tongue perfectly. T&G facings are standardized in both large and small types.

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MALE & FEMALE FLANGES (M&F)

Male-and-Female (M&F): With this type the flanges also must be matched. One flange face has an area that extends beyond the normal flange face (Male). The other flange or mating flange has a matching depression (Female) machined into it’s face., Male and female flanges (M&F flanges) are manufactured to be matched one to the other as well. Indeed, one flange face has an area extended beyond the normal flange face, i.e. the male, while the other flange has a matching depression machined on the facing surface, i.e. the female. The female face is 3/16” deep, while the male face is 1/4-inch high, and both of them are smooth finished. The outer diameter of the female face retains the gasket.

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Material Grades for Flanges : Types of Flanges are available in the following material grades:

Material & Grades of Flange :

• Stainless Steel Flange : ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L Flange
• Duplex & Super Duplex Steel Flange : ASTM A182 / ASME SA182 F44, F 45, F51, F 53, F 55, F 60, F 61 Flange
• Carbon Steel Flange : ASTM A105 / ASME SA105 ASTM / ASME A 350 , ASTM A181 LF2 / A516 Gr.70 A36, A694 F42, F46, F52, F60, F65, F706 Flange
• Low Temperature Carbon Steel Flange: ASTM A350, LF2, LF3 Flange
• Alloy Steel Flange : ASTM A182 / ASME SA182 & A387 F1, F5, F9, F11, F12, F22, F91 Flange
• Copper Alloy Steel Flange : ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
• Nickel Alloy Flange : ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020) Flange

Specifications of Flanges