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Flanges FAQ

The differences between Forged Flanges and Cast Flanges

The advantages of Cast Flanges are high machining preciseness, complex appearance, simple machining process, and low machining cost. However, with the obivious disadvantages, including the apertures, cracks, and impurity, as well as the poor seamline inside. For e.g., the cutting flange has the poorest seamline. (Read More...)

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The differences between SO Flanges and SW Flanges

SW flanges are similar to Blind Flanges with a holed socket in the centre. It applies to the high temperature pipe with small inner diameter. In general, it is not acceptable for the high pressure pipe that necessary flaw detection cannot be finished well. (Read More...)

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The differences between SO Flanges and NW Flanges

The WN flanges have the same wall thickness and inner diameter with the pipe that is going to be welded. It is suitable for butt welding which means the seam is required to be welded both outside and inside. The butting welding can scatter the stress inside the flanges, and lower the risk of cracking, but cost more labor and welding solders. (Read More...)

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The characteristics and applications of various flanges

The flanges can be classified into different types including PL, WN, TH, SW, SE.

PL flanges apply to the carbon steel pipeline with nominal pressure no more than 2.5MPa. Its sealing face could be FF, MF and TG styles. The FF is most popular and economical to be used in the pipeline of soft fluid media, such like the low pressure non-purified air and low pressure cycling water. (Read More...)

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The differences among Flanges, Flanged Pipe Fittings, and Flanged Joints

Flanges refer to the pipe joint with a number of bolt holes. Fixed or welded onto the end of pipe, it works in pair and can be coupled by the bolts, so as to connect the two pipes together.

Flanged pipe fittings could be formed by casting, thread connecting, or welding. (Read More...)

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The Pole Stainless Steel Flanges applied in pipeline engineering

The stainless steel threaded flanges are generally applying to the pipeline with the hydraulic pressure no more than 4kg, and the stainless steel welded flange is for the pipeline with more than 4kg hydraulic pressure. (Read More...)

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The production standard of WN Flanges

The WN flanges made of forgeable piece should comply with the following production standards. The forgeable piece with the nominal pressure from 0.25MP to 1.0MPa made of carbon steel or austenite stainless steel should comply with the JB4726-4728Ⅰdegree forgeable piece standard. (Read More...)

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The production details of carbon steel flanges

The carbon steel flanges apply to the water conveyance engineering, power plant and station, pipeline system, chemical industry, etc.

The production steps in chronological order are raw material feeding, pretreatment, mixing, thermal forging, heat treatment, inspection, metallic machining, finished flange inspection, mark, character impression, delivery. (Read More...)

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The common seen materials of SO Flanges (Read More...)

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The application of WN Flanges (Read More...)

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The advantages of stainless steel flanges (Read More...)

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The welding method of WN Flanges (Read More...)

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The reason for the crack on welding point of stainless steel flanges (Read More...)

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Stainless steel flanges and stainless steel bolt (Read More...)

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The tips of flanges purchase (Read More...)

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The range of flange production
(Outside Diameter: 75mm - 2560mm)

China National Standard   European Standard  
Standard Type Standard Type
GB/T 9112-2000 ~ 9123-2000
Pressure: 0.25MPa ~ 10MPa
Size: DN10 ~ DN1200
BLIND
PLATE
LAP JOINT
SLIP ON
THREADED
WELDING NECK
LONG WELDING NECK
EN 1092-1
Pressure: Class PN6 ~ PN400
Size: DN10 ~ DN4000
PLATE
LOOSE PLATE
BLANK
WELDING NECK
HUBBED SLIP ON
HUBBED THREADED
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American Standard   German Standard  
Standard Type Standard Type
ASME B16.5
Pressure: Class 150 ~ 2500
Size: 1/2" ~ 24"
BLIND
BOSS BLIND
LAP JOINT
PLATE
SLIP ON
THREADED
WELDING NECK
LONG WELDING NECK
DIN
Pressure: PN6 ~ PN400
Size: DN10 ~ DN400
DIN 2527 - Blind; PN6 ~ PN100
DIN 2566 - Screwed; PN10 and PN16
DIN 2573 - Flanges for soldering or welding; PN6
DIN 2576 - Flanges for soldering or welding; PN10
DIN 2627 - Welding neck; PN400
DIN 2628 - Welding neck; PN250
DIN 2629 - Welding neck; PN320
DIN 2630 - Welding neck; PN1 and PN2.5
DIN 2631 - Welding neck; PN6
DIN 2632 - Welding neck; PN10
DIN 2633 - Welding neck; PN16
DIN 2634 - Welding neck; PN25
DIN 2635 - Welding neck; PN40
DIN 2636 - Welding neck; PN64
DIN 2637 - Welding neck; PN100
DIN 2638 - Welding neck; PN160
DIN 2641 - Lapped flanges; PN6
DIN 2642 - Lapped flanges; PN10
DIN 2655 - Lapped flanges; Plain collars; PN25
DIN 2656 - Lapped flanges; Plain collars; PN40
ASME B16.47A
Pressure: Class 150 ~ 900
Size: 26" ~ 60"
BLIND
WELDING NECK
ASME B16.47B
Pressure: Class 75 ~ 900
Size: 26" ~ 60"
BLIND
WELDING NECK
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Australian Standard   British Standard  
Standard Type Standard Type
AS 2129
Table: T/A, T/D, T/E, T/F, T/H, T/J, T/K, T/R, T/S, T/T
Size: DN15 ~ DN3000
BLANK
PLATE
BOSS
WELDING NECK
BS4504
Pressure: PN2.5 ~ PN40
Size: DN10 ~ DN4000
PLATE
LOOSE PLATE
WELDING NECK
BLANK
HUBBED THREADED
HUBBED SLIP ON
INTEGRAL
AS 4087
Pressure: PN16 ~ PN35
Size: DN50 ~ DN1200
BLANK
PLATE
WELDING NECK
BS10
Table: T/A, T/D, T/E, T/F, T/H
Size: 1/2" ~ 48"
PLATE
BOSS
WELDING NECK
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Japanese Standard   African Standard  
Standard Type Standard Type
JIS B2220
Pressure: 5K ~ 30K
Size: DN10 ~ DN1500
SLIP ON PLATE
SLIP ON HUBBED
SOCKET WELDING
WELDING NECK
LAP JOINT
THREADED
INTERGRAL
BLANK
SABS1123
Pressure: 250kPa ~ 6400kPa
Size: DN10 ~ DN3600
BLANK
WELDING NECK
PLATE
LOOSE
INTEGRAL
BOSS
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French Standard   Special Requirement  
Standard Type Standard Type
NFE 29203
Pressure: PN2.5 ~ PN420
Size: DN10 ~ DN600
PLATE
LOOSE
BLIND
WELDING NECK
SLIP ON
Size: Up to OD: 2560mm PLATE
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