Flanges Face Types, Flange Face Finish Types.

Marcel Piping Projects Supply PVT LTD is a ISO 9001:2015 Certified Manufacturers, Stockists, Suppliers, and Exporters of Flanges in all types of flange faces and finish. The flange face is the outside area that hosts the gasket. The available types of flange face are ring joint flange, flat, raised, male and female flange, lap joint flange, tongue and groove flange. Flanges with different faces require different gaskets and shall never be copulated to help leakage of the joint.

The ASME B 16.5 constitution requires that the flange face i.e. flat face flange and raised face flange has a specific roughness to guarantee that this surface be compatible with gasket and supply a high quality seal. A serrate finish, is needed with 30 to 55 groove per inch and resultant roughness between the 125 and 500 micro elevation. This is allow for varied grades of surface finish to be made available by flanges manufacture for the gasket contact surface of raw material flange. The most used outside are Stock Finish, Concentric Serrated, Spiral Serrated, Smooth Finish or Face, and Cold Water Finish.

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We are Leading Exporter and Supplier of Flanges Face Types includes Raised Face(RF), Flat Face(FF), Ring Joint(RTJ), Lap Joint, Tongue and Groove(T&G), Male and Female(M&F), Flange Face Finish Types includes Stock Finish, Spiral Serrated, Concentric Serrated, Smooth Finish Or Face, and Cold Water Finish.

Flange Face Finish Types FACE SURFACE FINISH

STOCK FINISH

It is the most widely used of any flange surface finish, because practically, is suitable for all ordinary service conditions. Under compression, the soft face from a gasket will embed into this finish, which helps create a seal, and a high level of friction is generated between the mating surfaces. The finish for these flanges is generated by a 1.6 mm radius round-nosed tool at a feed rate of 0.8 mm per revolution up to 12 inch. For sizes 14 inch and larger, the finish is made with 3.2 mm round-nosed tool at a feed of 1.2 mm per revolution.

SPIRAL SERRATED

This is also a continuous or phonographic spiral groove, but it differs from the stock finish in that the groove typically is generated using a 90-° tool which creates a “V” geometry with 45° angled serration.

CONCENTRIC SERRATED

As the name suggests, this finish is comprised of concentric grooves. A 90° tool is used and the serrations are spaced evenly across the face.

SMOOTH FINISH

This finish shows no visually apparent tool markings. These finishes are typically utilized for gaskets with metal facings such as double jacketed, flat steel and corrugated metal. The smooth surfaces mate to create a seal and depend on the flatness of the opposing faces to effect a seal. This is typically achieved by having the gasket contact surface formed by a continuous (sometimes called phonographic) spiral groove generated by a 0.8 mm radius round-nosed tool at a feed rate of 0.3 mm per revolution with a depth of 0.05 mm. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 – 250 micro inch).

Flange Face Types ASME B16.5 and ASME B16.47

RAISED FACE FLANGE (RF)

A raised face flange (RF) is easy to recognize as the gasket surface area is positioned above the bolting line of the flange. A raised face flange is compatible with a wide range of flange gaskets, ranging from flat to semi-metallic and metallic types (as, for example, jacketed gaskets and spiral wound gaskets), either ring or full face.

FLAT FACE FLANGE (FF)

Flat face flanges (FF) have a contact surface having the same height as the bolting line of the flange. Full face gaskets, generally of the soft type, are used between two flat face flanges. According to ASME B31.3, a flat face flange should never be mated with a raised face flange as the resulting flanged joint would definitely leak.

RING JOINT FLANGE (RTJ)

A ring joint flanges (RTJ) is used when a metal-to-metal seal between the mating flanges is required (which is a condition for high-pressure and high-temperature applications, i.e. above 700/800 C°). A ring joint flange features a circular groove to accommodate a ring joint gasket (oval, or rectangular). RTJ flanges can be sealed by RTJ gaskets of different styles (R, RX, BX) and profiles (example: octagonal/oval for the R style).

LAP JOINT FLANGE

A lap joint flange has a flat face, which is not used to seal the flanged joint but simply hosts the back of a stub end. The sealing surface is actually on the stub end itself and may be either flat face or raised face.

TONGUE AND GROOVE FLANGE (T AND G)

Two tongue and groove flanges (T&G face) perfectly fit one into the other: one flange has a raised ring, the other a groove and they can be mated easily (the tongue enters the groove and seals the joint).

MALE AND FEMALE FLANGE (M AND F)

Similarly to tongue and groove flanges, male and female flanges (M&F face type) match one to the other as well. One flange has an area extended beyond its face area, the male flange, the other flange has a matching depression machined on the facing surface, the female flange. The female face is 3/16” deep, while the male face is 1/4″ high, and both of them are smooth finished. The outer diameter of the female face retains the gasket.

Flange Specifications

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