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Overview
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. SMGI’s Pipe flanges are protruding rims, edges, ribs, or collars used to make a connection between two pipes or between a pipe and any type of fitting or equipment component.
Flange Types
SMGI offers a wide selection of flanges originating in G7 or South Korean raw materials. The most used flanges types in the Petro & chemical industry are as below. All types except the Lap Joint flange are provided with a raised face.
Welding Neck Flange
Butt welded onto the end of a pipe, providing a flange that is suitable for high temperature and pressure.
Slip On Flange
Have a plain hole but without the shoulder. Fillet welds are added to the pipe on both sides of the flange.
Socket-Welded Flanges
Have a plain hole with a shoulder at the bottom. The pipe is inserted into the hole to butt against the shoulder and then welded into place with a fillet weld around the outside. It is used for small-diameter pipes operating at low pressure.
Lap Joint Flange
Consists of two parts; a stub end and a backing flange. The stub end is butt-welded to the end of the pipe and includes a small flange without any holes. The backing flange can slide over the stub end and provide holes to bolt to another flange. This arrangement allows disassembly in confined spaces.
Theraded Flange
Have an internal (female) thread, a threaded pipe screwed into it. It is relatively easy to fit but is not suitable for high pressure and temperature.
Blind Flange
A form of a blanking plate that is bolted to another pipe flange to isolate a section of piping or to terminate piping.
Flange Products
The ANSI Class rating of a flange is defined as the maximum amount of pressure that the flange can withstand at increasing temperatures. SMGI provides all seven primary pressure classes for flanges, which are 150, 300, 400, 600, 900, 1500, and 2500.
CLASS 1500-2500 FLANGES
JIP 7S-15-84 & ANSI B 16.5
A DIN standard is a standard drawn up at the German Institute for Standardization (DIN) in Berlin that sets unified standards for products and processes, such as quality, minimum performance, characteristics, dimensions, etc. SMGI supplies the Pressures Ratings (PN) up to 40Bar such as PN6, PN10, PN16, PN25, and PN40.
40BAR
DIN 2545 SLIP-ON FLAGES DIN 2527 BLING FLANGES DIN 2635 WELDING NECK FLANGES
The Japanese Industrial Standard (JIS), published by the Japanese Standards Association (JSA) is the equivalent of ANSI in the United States. They are created and updated by the Committee of the Japanese Industrial Standards (JISC). SMGI makes the JIS F7805, F2220, F2216, F2291 and F7806, up to 350Kgf/㎠.
350Kgf/㎠
FLANGE FOR OIL PRESSURE
10K SET-ON FLANGE
JIS B 2220 - 1984
A weld neck flange, also referred to as tapered hub flange or high-hub flange, is a kind of flange that can relocate stress to the pipes, ensuring a decrease in high-stress concentration at the bottom of the flange. SMGI provides seven types and sizes up to 63Kgf/Cm2 and FACING 2.
63Kg/㎠
JIS B2220-1984(KSB 1503-1999) WELDING NECK STEEL PIPE FLANGES
FACING2
We are authorized to provide the Korean Industrial Standards (KS Mark) flanges as well. The flanges for water industries such as sluice valves, butterfly valves, Fittings of coated steel pipes, and spring safety valves are also available.
KS B 2332 - 1994 : Sluice valves for water works flange KD B 2333 - 1995 : Butterfly valves water works flange KS D 3578 - 1997 : Fittings of Coated Steel Pipes for Water Service
Ordering Information
The materials for flanges are determined by the choice of the pipe, as in most cases, a flange is of the same material as the pipe. Each flange ASME B16.5 has many standard dimensions. If a draftsman in Japan a work preparer in Canada or a pipefitter in Australia is speaking about a Welding Neck flange NPS 6, Class 150, Schedule 40 ASME B16.5. To inquire correctly, please contact SMGI’s sales team!
