The intro of flange

PEIDE is speciallized in water filters,chemical dosing system,uv sterilizers,pump controlled pressurisation system and so on.We are pleasure to share all kinds of professional knowledge for everyone in water treatment industry.We will introduce the knowledge of flange as below,such as material,type,function and so on.


The brief of flange
There are many different flange standards to be found worldwide. To allow easy functionality and inter-changeability,these are designed to have standardised dimensions.Common world standards include ASA/ANSI/ASME (USA),PN/DIN (European),BS10 (British/Australian),and JIS/KS (Japanese/Korean).
In most cases these are not interchangeable.Further,many of the flanges in each standard are divided into “pressure classes”, allowing flanges to be capable of taking different pressure ratings. Again these are not generally interchangeable.
These pressure classes also have differing pressure and temperature ratings for different materials. Unique pressure classes for piping can also be developed for a process plant or power generating station;these may be specific to the corporation,engineering procurement and construction (EPC) contractor,or the process plant owner.The ANSI/ASME pressure classes for Flat-Face flanges are 125# and 250#.The classes for Ring-Joint,Tongue & Groove, and Raised-Face flanges are 150#, 300#, (400# – unusual), 600#, 900#, 1500#, and 2500#.
The flange faces are also made to standardized dimensions and are typically “flat face”, “raised face”, “tongue and groove”, or “ring joint” styles, although other obscure styles are possible.
Flange designs are available as “weld neck”, “slip-on”, “lap joint”, “socket weld”, “threaded”, and also “blind”.


The standards of flange

Pipe flanges that are made to standards called out by ASME B16.5 or ASME B16.47 are typically made from forged materials and have machined surfaces.B16.5 refers to nominal pipe sizes (NPS) from ½” to 24″. B16.47 covers NPSs from 26″ to 60″. Each specification further delineates flanges into pressure classes: 150,300,400,600,900,1500 and 2500 for B16.5, and B16.47 delineates its flanges into pressure classes 75,150,300,400,600,900.However these classes do not correspond to maximum pressures in psi.Instead,the maximum pressure depends on the material of the flange and the temperature.
The gasket type and bolt type are generally specified by the standards;however,sometimes the standards refer to the ASME Boiler and Pressure Vessel Code (B&PVC) for details.These flanges are recognized by ASME Pipe Codes such as ASME B31.1 Power Piping,and ASME B31.3 Process Piping.

The pipe flange standards in China as below:
(I)GB 9112~9125SH 3406
Flanges in other countries also are manufactured according to the standards for materials, pressure ratings,etc. Such standards include DIN,BS,and/or ISO standards.


The materials of flange
Materials for flanges are usually under ASME designation: SA-105 (Specification for Carbon Steel Forgings for Piping Applications),SA-266 (Specification for Carbon Steel Forgings for Pressure Vessel Components),or SA-182 (Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings,and Valves and Parts for High-Temperature Service).In addition,there are many “industry standard” flanges that in some circumstance may be used on ASME work.


The type of flange
Plate flat welding flange as below:

Plate flat welding flange


Hubbed slip-on-welding flange as below:

Hubbed slip-on-welding flange


Integral flange as below:

Integral flange


Socket welding flange as below:

Socket welding flange


Threaded flange as below:

Threaded flange


Blind flange as below:

Blind flange


Ask and answer about flange

What ‘s the flange joint?
A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together.
What’s the vacuum flange?
A vacuum flange is a flange at the end of a tube used to connect vacuum chambers,tubing and vacuum pumps to each other.
What’s the effect of flange?
The flange is used for positioning.
What’s the materials of flange?
Forged steel,WCB,carbon steel,stainless steel,316L,316,304L,304,321,chrome molybdenum steel, chrome molybdenum molybdenum vanadium steel,titanium,rubber lining,lining fluorine material.
What’s the execution standard of flange?
GB series (national standard), JB series (machinery), HG series (chemical), ASME B16.5 (American standard), BS4504 (British standard), DIN (German standard), JIS (Japanese standard).
What’s the kind of flange?
Flat welding flange,hubbed slip-on-welding flange,welding neck flange,ring connecting flange, socket welding flange,blind flange,etc.
What’s the application of flange?
It is used in engineering design,boiler,water supply and drainage,heating and ventilation automatic control and so on.
What’s the principle of choosing flange?
If the design temperature≦300℃ and nominal pressure≦2.5MPa,should use flat welding flange.If the design temperature >300℃ or nominal pressure≧4.0MPa,should use welding neck flange.


The uv sterilizers which manufactured by PEIDE,the inlet&outlet for small flow use threaded flange connection,and the inlet&outlet for big flow all use flange connection.Other water treatment equipments,such as sand filters,vacuum deaerators,also use flange connection.It’s very easy to assemble.


Click here for two sets of chemical dosing system have been installed complete successfully>>

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