ASME B16.5,ASTM A105,EN 1092-1,ISO 15590-3,JIS B2220 (NPS1/2-NPS24) FLANGE
|Country of Origin︰||China
Type Of Flanges
Slip On Flange (SORF)
Socket Weld Flange (SWRF)
Blind Flange (BLRF)
Weld Neck Flange (WNRF)
Lap Joint Flange
Long Weld Neck Flanges
Spectacle Blind Flange
Ring Type Joint Flange (RTJ)
Raised Face Flange
Tongue and Groove Flange
Male and Female Flange
High hub Blind Flange
Hydraulic Sae Flange
Standards of Flanges
B16.47 Large Diameter Steel Flanges: NPS 26 through NPS 60 This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for pipe flanges in sizes NPS 26 through NPS 60 and in ratings Classes 75, 150,0300, 400, 600, and 900. Flanges may be cast, forged, or plate (for blind flanges only) materials. Requirements and recommendations regarding bolting and gaskets are also included.
The American Society of Mechanical Engineers issues standards for mechanical and piping design. ASME standard B16.47 covers large diameter pipes up to a 60-inch bore. ASME standard B16.7 series A flanges are equivalent to MSS SP44 flanges. ASME standard B16.7 series B matches API 605 flanges.
B16.5 Pipe Flanges and Flange Fittings standard covers pressure-temperature ratings, materials, dimensions, tolerances,marking, testing, and methods of designating openings for pipe flanges and flanged fittings.The standard includes flanges with rating class designations 150, 300, 400, 600, 900, 1500, and 2500 in sizes NPS 1/2 through NPS 24, with requirements given in both metric and U.S units. The Standard is limited to flanges and flanged fittings made from cast or forged materials, and blind flanges and certain reducing flanges made from cast, forged, or plate materials. Also included in this Standard are requirements and recommendations regarding flange bolting, flange gaskets, and flange joints.
API flanges are designed to handle very high pressures and temperatures. API flanges have a smaller bolt circle than MSS flanges. All API flanges are ring joint flanges. API flange standards start with a number followed by a letter. API standard 17D is the specification for sub-sea well head flanges.
Flange standard series
American Standard Series
ASME/ANSI B16.5 Class 150 BL
ASME/ANSI B16.5 Class 300 BL
ASME/ANSI B16.5 Class 600 BL
ASME/ANSI B16.5 Class 900 BL
ASME/ANSI B16.5 Class 1500 BL
ASME/ANSI B16.5 Class 2500 BL
ASME B16.47 Series A/MSS SP-44 Class 150 BL
ASME B16.47 Series A/MSS SP-44 Class 300 BL
ASME B16.47 Series A/MSS SP-44 Class 600 BL
ASME B16.47 Series A/MSS SP-44 Class 900 BL
ASME B16.47 Series B/API 605 Class 75 BL
ASME B16.47 Series B/API 605 Class 150 BL
ASME B16.47 Series B/API 605 Class 300 BL
ASME B16.47 Series B/API 605 Class 600 BL
ASME B16.47 Series B/API 605 Class 900 BL
ASME B16.48 Class 150
ASME B16.48 Class 300
ASME B16.48 Class 600
ASME B16.48 Class 900
ASME B16.48 Class 1500
ASME B16.48 Class 2500
ASME/ANSI B16.5 Class 150 LJ
ASME/ANSI B16.5 Class 300 LJ
ASME/ANSI B16.5 Class 600 LJ
ASME/ANSI B16.5 Class 900 LJ
ASME/ANSI B16.5 Class 1500 LJ
ASME/ANSI B16.5 Class 2500 LJ
ASME B16.36 Class 300, Welding Neck, Slip-On and Threaded
ASME B16.36 Orifice Flanges Class 400, Welding Neck2
ASME B16.36 Orifice Flanges Class 600, Welding Neck2,3
ASME B16.36 Orifice Flanges Class 900, Welding Neck2
ASME B16.36 Orifice Flanges Class 1500, Welding Neck2
ASME B16.36 Orifice Flanges Class 2500, Welding Neck2
Ring Joint Facings ASME/ANSI B16.5 & B16.47-1
Ring Joint Facings ASME/ANSI B16.5 & B16.47-2
Ring Joint Facings ASME/ANSI B16.5 & B16.47-3
Ring Joint Facings ASME/ANSI B16.5 & B16.47-4
ASME/ANSI B16.5 Class 150 SW
ASME/ANSI B16.5 Class 300 SW
ASME/ANSI B16.5 Class 600 SW
ASME/ANSI B16.5 Class 1500 SW
ASME/ANSI B16.5 Class 150 SO
ASME/ANSI B16.5 Class 300 SO
ASME/ANSI B16.5 Class 600 SO
ASME/ANSI B16.5 Class 900 SO
ASME/ANSI B16.5 Class 150 WN
ASME/ANSI B16.5 Class 300 WN
ASME/ANSI B16.5 Class 600 WN
ASME/ANSI B16.5 Class 900 WN
ASME/ANSI B16.5 Class 1500 WN
ASME/ANSI B16.5 Class 2500 WN
ASME B16.47 Series A/MSS SP-44 Class 150 WN
ASME B16.47 Series A/MSS SP-44 Class 300 WN
ASME B16.47 Series A/MSS SP-44 Class 600 WN
ASME B16.47 Series A/MSS SP-44 Class 900 WN
ASME B16.47 Series B/API 605 Class 75 WN
ASME B16.47 Series B/API 605 Class 150 WN
ASME B16.47 Series B/API 605 Class 300 WN
ASME B16.47 Series B/API 605 Class 600 WN
ASME B16.47 Series B/API 605 Class 900 WN
ANSI/AWWA C207-07, AWWA Standard for Steel Pipe Flanges for Waterworks Service-Sizes 4 In. Through 144 In. (100 mm Through 3,600 mm)
AWWA C207 Class B-Ring and Blind Flanges
AWWA C207 Class B-Hub and Blind Flanges
AWWA C207 Class D-Ring and Blind Flanges
AWWA C207 Class D-Hub and Blind Flanges
AWWA C207 Class E-Ring and Blind Flanges
AWWA C207 Class E-Hub and Blind Flanges
AWWA C207 Class F-Ring and Blind Flanges
BS 10:1962 Specification for Flanges and Bolting for Pipes, Valves and Fittings (covering plain, boss, integrally cast or forged, and welding neck type flanges).
BS 1560 : WELDING NECK FLANGE, SOCKET WELDING FLANGE, SLIP-ON BOSS FLANGE, BLIND FLANGE, SCREWED BOSS FLANGE, LAPPED FLANGE. Pressure Class : 150 , 300 , 400 , 600 , 900, 1500 , 2500
BS 4504(ISO 7005-1: 1992 (E) Specification for Steel Flanges (pressure ranges PN 2.5 to PN 40 and nominal sizes up to DN 4000)
BS 3293 Class 150 SO
BS 3293 Class 300 SO
BS 3293 Class 600 SO
BS 3293 Class 150 WN
BS 3293 Class 300 WN
BS 3293 Class 600 WN
DIN Flange Standards:
DIN 2527 Blind flange - PN6-PN 100
DIN 2576 Flat flange for welding - PN 10
DIN 2642 Lapped flange - PN 10
DIN 2655 Lapped flange - PN 25
DIN 2656 Lapped flange - PN 40
DIN 2641 Lapped flange - PN 6
DIN 2673 Lose flange and ring with neck for welding - PN 10
DIN 2561 Oval flange, with neck threaded - PN 10 and PN 16
DIN 2558 Oval flange, with neck threaded - PN 6
DIN 2566 Threaded flange with neck - PN 10 and PN 16
DIN 2630 Welding neck flange - PN 1 and PN 2.5
DIN 2632 Welding neck flange - PN 10
DIN 2637 Welding neck flange - PN 100
DIN 2633 Welding neck flange - PN 16
DIN 2638 Welding neck flange - PN 160
DIN 2634 Welding neck flange - PN 25
DIN 2628 Welding neck flange - PN 250
DIN 2629 Welding neck flange - PN 320
DIN 2635 Welding neck flange - PN 40
DIN 2627 Welding neck flange - PN 400
DIN 2573 Welding neck flange - PN 6
DIN 2636 Welding neck flange - PN 64
DIN 2631 Welding neck flange - PN6
Carbon Steel: DIN 17175: ST35.8,ST45.8, ST37.2,ST37, DIN 17173: ST35N
Stainless Steel: W.Nr 1.4301, W.Nr 1.4306, W.Nr 1.4401, W.Nr 1.4404, W.Nr 1.4541
Duplex Stainless Steel: W.Nr 1.4362, W.Nr1.4417, W.Nr1.4462, W.Nr1.4460, W.Nr1.4501, W.Nr1.4410, W.Nr 1.4507
API 605 Large-diameter Carbon Steel Flanges (nominal Pipe Sizes 26 Through 60; Classes 75, 150, 300, 400, 600 And 900)
MSS SP-9 standard for spot facing flanges.
MSS SP-44 standard for steel pipeline flanges.
MSS SP-60 standard for connecting flange joint.
AS4087-2004 Metallic flanges for waterworks purposes
AS2129 Flanges for Pipes, Valves and Fittings
AWWA C207 Steel Pipe Flanges for Waterworks Service--Sizes 4 In. Through 144 In. (100 mm Through 3600 mm).
EN1092-1 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories.
12820-80 Russian pipe flanges standard for flat type.
12821-80 Russian pipe flanges standard for weld neck type.
ISO 15590-3:2004 Petroleum and natural gas industries -- Induction bends, fittings and flanges for pipeline transportation systems -- Part 3: Flanges
B2220 Steel Welding Pipe Flanges.
B1503 Steel Welding Pipe Flanges.
SANS-1123 South African pipe flanges standard.
TOTAL GS EP PLR 222 Carbon steel flanges and branch outlet fittings and forged
components for pipelines (sweet service)
TOTAL GS EP PLR 223 Carbon steel tees for pipelines (sweet service)
UNI 2276-67 Flat Flange.
UNI 2277-67 Flat Flange.
UNI 2278-67 Flat Flange.
UNI 6083-67 Flat Flange.
UNI 6084-67 Flat Flange.
UNI 6088-67 Lap Joint Flange, Loose Flange.
UNI 6089-67 Lap Joint Flange, Loose Flange.
UNI 6090-67 Lap Joint Flange, Loose Flange.
UNI 2299-67 Lap Joint Flange, Loose Flange.
UNI 2300-67 Lap Joint Flange, Loose Flange.
UNI2280-67 Weld Neck Flange.
UNI2281-67 Weld Neck Flange.
UNI2282-67 Weld Neck Flange.
UNI2283-67 Weld Neck Flange.
UNI2284-67 Weld Neck Flange.
UNI2285-67 Weld Neck Flange.
UNI2286-67 Weld Neck Flange.
UNI2253-67 Threaded Neck Flange.
UNI2254-67 Threaded Neck Flange.
UNI6091-67 Blind Flange.
UNI6092-67 Blind Flange.
UNI6093-67 Blind Flange.
UNI6094-67 Blind Flange.
UNI6095-67 Blind Flange.
UNI6096-67 Blind Flange.
UNI6097-67 Blind Flange.
b. Raw material:
All pipe flanges in carbon, stainless, alloys and chrome steel materials. ( See Technology pages )
c. Flange types:
Weld Neck (WN), Slip on (SO), Blind (BL), Threaded (THR), Socket Weld (SW), Lap Joint (LJ), Orifice Flanges, RTJ and custom flanges.
Sizes Range from 1/2" to 80", DN15-DN2000.
ANSI, ASME, ASTM, BS10 - Lbs/Psi 150, 250, 300, 350, 400, 600, 900, 1500, 2500
JIS B2220, KS1503 - 5K, 10K, 16K, 20K, 30K
DIN, UNI, EN1092-1, BS 4504, GOST12820/12821-80 etc - PN6, PN10, PN16, PN25, PN40, PN63, PN100
SANS/SABS 1123 - Class 600/3, 1000/3, 1600/3, 2500/3, 4000/3
|Standard Met︰||Types of Flanges
As already described before, the most used flange types ASME B16.5 are: Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type
Welding Neck flange
Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.
The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.
These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.
This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld).
Details of Welding Neck flange
1. Weld Neck flange 2. Butt Weld
3. Pipe or Fitting
Slip On flange
The calculated strength from a Slip On flange under internal pressure is of the order of two-thirds that of Welding Neck flanges, and their life under fatigue is about one-third that of the latter.
The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.
The X measure on the image, are approximately:
Wall thickness of pipe + 3 mm.
This space is necessary, to do not damage the flange face, during the welding process.
A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting. A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange.
Details of Slip On flange
1. Slip On flange 2. Filled weld outside
3. Filled weld inside 4. Pipe
Socket Weld flange
Socket Weld flanges were initially developed for use on small-size high pressure piping. Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.
The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.
ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says:
In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16" (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.
The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap.
The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion.
Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.
Details of Socket Weld Flange
1. Socket Weld flange 2. Filled weld 3. Pipe
X = Expansion gap
Lap Joint flange
Lap Joint Flanges have all the same common dimensions as any other flange named on this page however it does not have a raised face, they used in conjunction with a "Lap Joint Stub End".
These flanges are nearly identical to a Slip On flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub End.
Their pressure-holding ability is little, if any, better than that of Slip On flanges and the fatigue life for the assembly is only one tenth that of Welding Neck flanges.
They may be used at all pressures and are available in a full size range. These flanges slip over the pipe, and are not welded or otherwise fastened to it. Bolting pressure is transmitted to the gasket by the pressure of the flange against the back of the pipe lap (Stub End).
Lap Joint flanges have certain special advantages:
Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes.
Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with corrosion resistant pipe.
In systems which erode or corrode quickly, the flanges may be salvaged for re-use.
Details of Lap Joint Flange
1. Lap Joint flange 2. Stub End
3. Butt weld 4. Pipe or Fitting
A Stub End always will be used with a Lap Joint flange, as a backing flange.
This flange connections are applied, in low-pressure and non critical applications, and is a cheap method of flanging.
In a stainless steel pipe system, for example, a carbon steel flange can be applied, because they are not come in contact with the product in the pipe.
Stub Ends are available in almost all pipe diameters. Dimensions and dimensional tolerances are defined in the ASME B.16.9 standard. Light-weight corrosion resistant Stub Ends (fittings) are defined in MSS SP43.
Lap Joint Flange with a Stub End
Threaded Flanges are used for special circumstances with their main advantage being that they can be attached to the pipe without welding. Sometimes a seal weld is also used in conjunction with the threaded connection.
Although still available in most sizes and pressure ratings, screwed fittings today are used almost exclusively in smaller pipe sizes.
A threaded flange or fitting is not suitable for a pipe system with thin wall thickness, because cutting thread on a pipe is not possible. Thus, thicker wall thickness must be chosen...what is thicker ?
ASME B31.3 Piping Guide says:
Where steel pipe is threaded and used for steam service above 250 psi or for water service above 100 psi with water temperatures above 220° F, the pipe shall be seamless and have a thickness at least equal to schedule 80 of ASME B36.10.
Details of Threaded flange
1. Threaded flange 2. Thread 3. Pipe or Fitting
Blind Flanges are manufactured without a bore and used to blank off the ends of piping, Valves and pressure vessel openings.
From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types.
However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these flanges are suitable for higher pressure temperature applications.
Details of Blind flange
1. Blind flange 2. Stud Bolt 3. Gasket 4. Other flange
ASME B16.5 Raised Face Flange