Pipe flanges

Pipe flanges are basically plates or rings used to connect pipes, valves and other piping equipment to form a piping system.

Common flange types

Flanges are used in many types with each having a different purpose than the other.

Blind flanges

These Flanges are used as a termination point to a piping system.

Welding Neck Flanges

Weld Neck Flanges - are normally referred to as the high hub flange.

Slip-On Flanges

Slip-On flanges are commonly lower in price than weld-neck flanges.

Lap Joint Flanges

Lap Joint Flanges

Lap Joint Flanges - available in a range of sizes to pair with stub end fittings for easy dismantling

Threaed flange

Threaded Flanges

Threaded flanges are used to connect lengths of pipes without the need to weld similar to slip-on pipe flanges.

Socket Weld Flanges

Socket-Weld Flanges has a female socket in which pipe is fitted that done from outside on the pipe.

Standard we supply
ANSI
AWWA
ASME
DIN

Pipeline & fittings with flanges

Flange connection

Pipe Flange helps to connect piping components in a piping system with the use of bolted connections and gaskets.

Pipe Flanges Raw Material Specifications

The usual materials of flanges include stainless steel, carbon steel, aluminum and plastic.

Raw material

1. Raw Material

  • Raw Material Check
  • Quantity Check
  • Visual & Dimension Check

2. Material Inspection

  • Chemical Analysis Check
  • Preservation Analysis Certificate
Steel material cutting

3. Material Cutting

  • Weight Measuring
  • Cut Surface Check
  • Marking
Material
Test basis / Requirements
Delivery Condition
 C 22.8 (1.0460)  DIN 17243: 01.87 + VdTUEV - WB 350/3: 2009
  DIN 17243: 01.87
  VdTÜV - WB 350/3: 2009
 +N
 P250GH (1.0460)  DIN EN 10222-2: 04.2000
  National Annex
 +N
 P245GH (1.0352)  EN 10222-2:1999-12 + AC : 2000-02
 +N
 A105N / C21  ASTM A105/A105M-05/ ASME BPVC Sec.2 Part.A:04
  + VdTUEV399/3: 1996-09
  + NACE MR 0175: 2000
 +N
 A105N  ASTM A105/A105M-05/ ASME BPVC Sec.2 Part.A:04
  + NACE MR 0175: 2000
 +N
 C21 (1.0432)  VdTUEV - WB 399/3: 1996-09
 +N
 RSt 37-2 (1.0038)  DIN 17100: 1980-01
 +N
 S235JR (1.0038)  DIN EN10025-2: 2005-04
 +N
 16Mo3 (1.5415)  DIN EN10222-2:1999-12 + AC:2000-02
 +N
 WStE355 / TStE355
  (1.0565 / 1.0566)
 DIN EN17103 :1989-10, + VdTUEV-WB 354/3 : 2001-06
 +N or QT
 P355NH  (1.0565)  DIN EN10222-4: 1998 + A1: 2002-12
 +N
 WStE355 / P355NH 
  (1.0565)
 DIN EN17103 :1989-10, + VdTUEV-WB 354/3 : 2001-06
  + DIN EN10222-4: 1998 + A1: 2002-12
  + DIN EN17103 :1989-10
  + DIN EN10222-4: 1998 + A1: 2002-12
 +N or QT
 1.4301 (X5CrNi17-10)  DIN EN10222-5: 2000-02
 +AT
 1.4306 (X2CrNi19-11)  DIN 17440:1996-09
 +AT
 1.4401 (X5CrNiMo17-12-2)  DIN EN10222-5: 2000-02
 +AT
 1.4404 (X2CrNiMo17-12-2)  DIN EN10222-5: 2000-02
 +AT
 1.4432 (X2CrNiMo17-12-3)
 DIN EN10222-5: 2000-02
 +AT
 1.4541 (X6CrNiTi18-10)
 DIN EN10222-5: 2000-02
 +AT
 1.4571 (X6CrNiMoTi17-12-2)
 DIN EN10222-5: 2000-02
 +AT
 1.4541 / F321
 DIN EN10222-5: 2000-02 / +ASTM A 182/A 182M :2005
 +AT
 1.4571 / F316Ti  DIN EN10222-5: 2000-02 / +ASTM A 240
 +AT
 1.4404 / F316L
 DIN EN10222-5: 2000-02 / +ASTM A 182/A 182M :2005
 +AT
 1.4306 / F304L
 DIN 17440.1996-09 / +ASTM A 182/A 182M : 2005
 +AT
 1.4307 / F304L  DIN EN10222-5: 2000-02 / +ASTM A 182/A 182M :2005
 +AT
Flange
Test basis / Requirements
 DIN, Carbon Steel
 DIN2519:1991-06
  + AD2000-W9: 02.04; -W13/ TRD107;TRB100;
  + Directive 97/23/EG Annex I, Chap. 4.3: 1998-02
 DIN, corrosion-resistant Steel
 DIN2519:1991-06
  + AD2000-W9: 02.04; -W2; -W10 / TRD107; TRB100;
  + Directive 97/23/EG Annex I, Chap. 4.3: 1998-02
 DIN EN 1092-1, Carbon Steel
 DIN EN 1092-1: 2008-09
  + AD2000-W9; -W13/TRD107;TRB100
  + Directive 97/23/EG Annex I, Chap. 4.3: 1998-02
 DIN EN 1092-1, Stainless Steel
 DIN EN 1092-1: 2008-09
  + AD2000-W9; -W2; -W10/ TRD107; TRB100
  + Directive 97/23/EG Annex I, Chap. 4.3: 1998-02
 ANSI  ASME B16.5:2003
  ASME B16.47:2006

According to user needs, we can produce all kinds of steel strip winding finned tube and steel aluminum composite finned tube.

Specialty flange

Except the most used standard flanges, there are still a number of specialty flange such as:

Spectacle Blind Flange
Spectacle Blind Flange
Spectacle Blind Flange consist of a connected ring and a plate.

Screwed Flanges
This flange is referred to as either threaded or screwed.

Weldoflange, Nipoflange
Anchor flange
An anchor flange is a device installed on a pipeline to combat axial movement.

Orifice Weld Neck Flanges
Orifice Flanges
Orifice Flanges generally come with either Raised Faces or RTJ (Ring Type Joint) facings.
Long Weld Neck Flange
Reducing Flange
Reducing Flange is used on projects that require the fitting together of different sized pipes.
Expander Flange
Expander Flange
Expander Flange is using a separate reducer-welding neck flange combination.
Anchor flange
Weldoflange / Nipoflange
Weldoflange / Nipoflange is a combination of a Welding Neck flange and a supposedly Weldolet or Nipolet.
Large Diameter Flanges
Large Diameter Flanges
The large diameter flange is used to connect or to block off two very large diameters sized pipes.
NW Long Weld Neck Flanges
NW Long Weld Neck Flanges
Long weld neck flange is also call integral flange, it means a welding neck flange has a very long neck.

Flanges Manufacturing Process

Our manufacturing process is highly sophisticated and is divided into various departments supervised by experienced industry experts.

Requirements are valid for normal situation, in special you have to contact us to introduce.

Flange Tolerance

Sunny Steel is one of the oldest manufacturers, dealer, distributor, stockist & suppliers of Blind Flanges, Reducing Threaded Flanges, Lap Joint Flanges, Flange Gaskets, Threaded Flanges, Socketweld Flanges, Flanges Bolts, Ring Flange, Spectacle Blind Flanges, Weld Neck Flanges, Orifice Flange, Slip-On-Flanges, High Hub Blinds Flanges, which are manufactured using superior grade of steel like SS Flanges / Stainless Steel Flange, 310 Flanges, 321 Flanges, 202 Flanges, 347 Flanges, 304 Flange, 316 Flanges, 316L Flanges., These Flanges are most durable and manufactures to fit in different size of Pipes.

Our company offers a wide range of flanges like PL, SW, BL, WN,SO,LJ, ASME/ANSI B16.5 etc., which is precisely engineered in

Tolerance of Welding Neck Flanges
Outside Diameter When O.D. is 24" or less  ±1.6mm﹡
Inside Diameter 10" and smaller  ±0.8mm
12" thru 18"  ±1.6mm
20" and larger  +3.2mm, -1.6mm
Outside Diameter of hub 5" and smaller  +2.4mm, -0.8mm﹡
6" and larger  +4.0mm, -0.8mm
Diameter of contact face 1/16" rasied face tongue and groove male, female  ±0.8mm
1/4" rasied face tongue and groove male, female  ±0.4mm
Diameter of hub at base when hub base is 24" or smaller  ±1.6mm﹡
Diameter of hub at point of welding 5" and smaller  +2.4mm, -0.8mm
6" and larger  +4.0mm, -0.8mm
Drilling Bolt circle  ±1.6mm
Bolt hole spacing  ±0.8mm
Eccentricity of bolt circle with respect to facing 2 1/2" and smaller: 0.8mm, max﹡
Eccentricity of bolt circle with respect to bore 3" and larger: 1.6mm, max﹡
Thickness 18" and smaller  +3.2mm, -0mm
20" and larger  +4.8mm, -0mm
Length of thru hub 10" and smaller  ±1.6mm
12" and larger  ±3.2mm
Tolerance of Threaded Flanges, Socket Welding Flanges, Slip-On Flanges
Lap Joint Flanges and Blind Flanges
Outside Diameter When O.D. is 24" or less  ±1.6mm﹡
Inside Diameter Threaded Within limits on boring gauge
Socket welding, Slip-on and Lap joint, 10" and smaller  +0.8mm, -0mm
Socket welding, Slip-on and Lap joint, 12" and larger  +1.6mm, -0mm
Outside Diameter of hub 5" and smaller  +2.4mm, -0.8mm﹡
6" and larger  +4.0mm, -0.8mm
Diameter of contact face 1/16" rasied face tongue and groove male, female  ±0.8mm
1/4" rasied face tongue and groove male, female  ±0.4mm
Diameter of counterbore same as for inside diameter
Drilling Bolt circle ±1.6mm
Bolt hole spacing ±0.8mm
Eccentricity of bolt circle with respect to facing 2 1/2" and smaller: 0.8mm, max﹡
Eccentricity of bolt circle with respect to bore 3" and larger: 1.6mm, max﹡
Thickness 18" and smaller  +3.2mm, -0mm
20" and larger  +4.8mm, -0mm
Length of thru hub 10" and smaller  ±1.6mm
12" and larger  ±3.2mm
AWWA Standard flange
Dimensional tolerances for AWWA pipe flanges

Listed below are the Dimensional Tolerances to which flanges are manufactured. 

Ring type Slip-on and Blind flanges HUB type slip-on
O.D. <=24" +/- 0.6"(1.6mm) O.D. <=24" +/- 0.6"(1.6mm)
>24" +/- .12"(3.2mm) >24" +/- .12"(3.2mm)
I.D. Socket-Welding 10" and Samller
+.03"(0.8mm),-0"
I.D. 10" and Samller +.03"(0.8mm)
Slip-on and
Lap Joint
12" and Larger
+.06"(1.6mm),-0"
12"-18" +/-.06"(1.6mm)
20"-42" +.12"(3.2mm)
+.06"(1.6mm)
O.D. of Hub <=12" +.09"(2.4mm),
-.06"(1.6mm)
Diameter of
Contact Face
0.06" Raised Face +/-.03"(0.8mm)
14"-42" +/-.12"(3.2mm)
Diameter of Contact face 0.06" Raised Face +/- .03"(0.8mm) Diameter of Hub at base X<=24" +/-.06"(1.6mm)
X>24" +/-.12"(3.2mm)
Deameter of Contact face <=10" +.03"(0.8mm),
-0"
Diameter of Hub at point of Welding <=5" +.09"(2.4mm),
-.03"(0.8mm)
12"-42" +.06"(1.6mm),
-0"
>=6" +.16"(4.0mm),
-.03"(0.8mm)
Drilling Bolt Circle 1/2"-24"
/26"-42"
Drilling Bolt Circle 1/2"-24"
/26"-42"
+/-.06"(1.6mm)
+/-.06"
+/-.06"(1.6mm)
+/-.06"
Bolt hole
spacing
+/-.03"(0.8mm)
Bolt hole
spacing
+/-.03"(0.8mm)
Eccentricity of Bolt circle with respect to bore .03" Max.
(0.8mm)
Eccentricity of Bolt circle with respect to bore .03" Max.
(0.8mm)
Thickness 18"& Small +.12"(3.2mm),-0" Thickness 18"& Small +.12"(3.2mm),-0"
20"-42" +.19"(1.6mm) 20"-42" +.19"(1.6mm)
Length Thru Hub <=10" +/-.06"(1.6mm) Length Thru Hub <=10" +/-.06"(1.6mm)
12"-42" +/1.12"(3.2mm) 12"-42" +/1.12"(3.2mm)

These tolerances are a part of ANSI B16.5 and AWWA C207-01 Sec. 4.2 except where noted otherwise.  The limits given are maximum.  Rigid inspection procedure assures the maintenance of high standards of accuracy in regular day to day production.




SUNNY STEEL

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