What is a flange?
A flange is a metal disc utilized to sign up with pipes. A gasket is fixed http://deansxsy221.jigsy.com/entries/general/carbon-steel-explained-in-fewer-than-140-characters between the two flanges to tighten up the seal. A flange is used to link two pipes or valves or tubes to form a piping network. They supply support and strength and avoid leak.
Frequently welded or screwed into pipes or valves, bolts connect flanges together. Flanges provide simple access to clean or check a piping system.
Made of numerous metals - Stainless Steel, Cast Iron, Ductile Iron, Carbon Steel, etc., these flanges vary in 'pressure class'.
Every flange is classified under a pressure class, depending on the capacity of the flange to stand up to a particular quantity of temperature level. Likewise, the kind of metal utilized in identify just how much pressure it can withstand.
So it can be presumed that different flanges can withstand various temperatures (or pressures.) If the temperature level increases, the pressure score of the flange reduces and vice versa.
What is an Orifice flange?
Orifice flanges are disc-shaped flanges which include one of the 3 flanges namely Slip-on, Threaded and Weld neck.

Main function:
Orifice flange is a device having welding ends, which enables it to hold an orifice plate undamaged.
Widely utilized with orifice meters, they measure the flow rate of either liquid or gases, that flow through the pipe. The Orifice Flowmeter includes a thin Orifice plate, secured into orifice flanges.
An orifice plate, which is the device to determine the movement of the inner fluid or gas, is protected between 2 orifice flanges, which are attached to the pipe. The orifice plate consists of a little hole; with two pressure tap holes are drilled in each flange which assists in determining the pressure constructed inside the pipeline.
A 'jack screw' fitted between the 2 flanges, it makes it possible for to separate the flanges throughout inspection or replacement process.
Use:
Industries where Orifice flange is used -
Heavy and light chemicals
Steel
Paper
Nuclear
Petrochemicals
Sewage treatment
Water treatment and circulation
Power Generation
Oil production and refining
Gas Processing and transmission
Chemicals
Therefore, these flanges play a necessary function during the maintenance duration of the piping system. They are the very best fit for complicated pipeline networks.