Forged flanges in stainless steel, duplex, carbon steel, alloy steel and nickel alloys — with the
pressure ratings, dimensions, facings, grades and bolting you need to specify them.
Product Overview
The Joint That Holds the Line Together
We supply weld neck, slip on, socket weld, threaded, lap joint and blind flanges,
with long weld neck, reducing and orifice flanges and spectacle blinds, in stainless steel, duplex,
super duplex, carbon steel and alloy steel — and in nickel alloys and titanium for the lines that
need them.
Flanges are supplied in the pressure class, facing and bore that match your pipe, with bolting and
gaskets to complete each joint. Every flange is stamped with its grade, size, class and heat number
and supplied with a mill test certificate to EN 10204 Type 3.1 or 3.2. When your project needs
independent verification, inspection by your nominated agency is carried out before dispatch.
How the flange joins the pipe decides its strength, its cost and how easily the joint is made up. Each drawing shows the flange from the side, with the pipe it takes.
Weld Neck
WN · B16.5 · B16.47
Tapered hub butt welded to the pipe. The strongest flange, for high pressure and temperature.
Slip On
SO · B16.5
Slides over the pipe and is fillet welded inside and out. Economical and easy to align.
Socket Weld
SW · B16.5 · NPS 1/2 – 3
The pipe sits in a socket and is fillet welded outside. For small-bore, high-pressure lines.
Threaded
THD · B16.5 · NPT
Screwed onto the pipe with no welding — for areas where welding is not allowed.
Lap Joint
LJ · B16.5 · with stub end
A loose flange behind a stub end. Turns to line up bolt holes, and can be carbon steel on an alloy line.
Blind
BL · B16.5 · B16.47
A solid disc that closes the end of a line, a nozzle or a test point.
Long Weld Neck
LWN · heavy barrel
A weld neck with a long straight barrel, used as a nozzle on vessels and columns.
Reducing
Weld neck or slip on
A large flange bored for a smaller pipe, to change size at the joint.
Orifice
B16.36
A pair of weld neck flanges with pressure taps, holding an orifice plate for flow measurement.
Spectacle Blind
B16.48 · spacer & paddle
A blind and a spacer joined by a web. Swung round to isolate a line, or to open it.
Facings
The Face Seals the Joint
The gasket seals on the face of the flange, so the facing and its finish must suit the gasket. Both flanges of a joint must have the same facing.
Raised face (RF)
The gasket area stands proud of the bolting circle: 1.6 mm high for Class 150 and 300, 6.4 mm for Class 400 and above. The most common facing.
Flat face (FF)
The whole face is flat, with a full-face gasket. Used when mating cast iron, bronze or plastic flanges that could crack under a raised face.
Ring type joint (RTJ)
A machined groove holds a solid metal ring gasket. For high pressure and temperature, typically Class 600 and above.
Tongue & groove (T&G)
A narrow tongue on one flange fits a groove in the other, holding the gasket captive. Used on pump covers and valve bonnets.
Male & female (M&F)
A wide raised face on one flange fits a matching recess in the other, locating the gasket.
Face finish
Raised faces are machined with a spiral or concentric serration of 3.2 to 6.3 µm Ra, so the gasket grips. Smooth finishes are made to order.
Pressure Ratings
What Each Class Can Carry
A flange's class is a designation, not a pressure. The working pressure it allows depends on the material and falls as the temperature rises. These are the ASME B16.5 ratings for carbon steel A105, Material Group 1.1.
Rating by class, at 38 °C
bar · maximum working pressure, Group 1.1
Class 2500425.5
Class 1500255.3
Class 900153.2
Class 600102.1
Class 30051.1
Class 15019.6
Each step up in class raises the allowed pressure; a Class 2500 flange carries more than twenty times the pressure of a Class 150 flange.
Class 300, rating by temperature
bar · maximum working pressure, Group 1.1
−29 to 38 °C51.1
100 °C46.6
200 °C43.8
300 °C39.8
350 °C37.6
400 °C34.7
425 °C28.8
450 °C23.0
Above about 400 °C the rating of carbon steel drops quickly. For hotter service, alloy steel flanges keep their rating to higher temperatures.
Pressure–temperature ratings · Material Group 1.1 (A105, A350 LF2)
Temperature, °C
Class 150
Class 300
Class 600
Class 900
Class 1500
Class 2500
−29 to 38
19.6
51.1
102.1
153.2
255.3
425.5
50
19.2
50.1
100.2
150.4
250.6
417.7
100
17.7
46.6
93.2
139.8
233.0
388.3
150
15.8
45.1
90.2
135.2
225.4
375.6
200
13.8
43.8
87.6
131.4
219.0
365.0
250
12.1
41.9
83.9
125.8
209.7
349.5
300
10.2
39.8
79.6
119.5
199.1
331.8
325
9.3
38.7
77.4
116.1
193.6
322.6
350
8.4
37.6
75.1
112.7
187.8
313.0
375
7.4
36.4
72.7
109.1
181.8
303.1
400
6.5
34.7
69.4
104.2
173.6
289.3
425
5.5
28.8
57.5
86.3
143.8
239.7
450
4.6
23.0
46.0
69.0
115.0
191.7
Swipe the table sideways to see every class
Pressures in bar gauge. Other materials have their own tables in ASME B16.5; the group for each common forging grade is listed below.
Material groups of common flange grades
Group
Flange grades
1.1
A105 · A350 LF2
1.9
A182 F11 Cl. 2
1.10
A182 F22 Cl. 3
1.15
A182 F91
2.1
A182 F304 · F304H
2.2
A182 F316 · F316H
2.3
A182 F304L · F316L
2.4
A182 F321
2.5
A182 F347
2.8
A182 F51 · F53 · F55
How to choose the class
Find the material groupFrom the flange grade, using the table on the left.
Find the design temperatureThe highest temperature the joint will see in service.
Read across the classesIn the rating table for that group, at that temperature.
Choose the lowest class that is enoughIts rating must be at least the design pressure of the line.
Materials & Grades
Forging Grades, Matched to the Pipe
Flanges are forged, so each material has a forging specification. Choose a family to see the flange grades, and the pipe grade each one is welded to.
Stainless Steel Flanges
Stainless flanges are forged to ASTM A182, where each grade carries an F prefix. The grade matches the A312 pipe it is welded to.
Forged flanges
ASTM A182 · ASME SA182
Plate flanges
ASTM A240
Matching pipe
ASTM A312 · A358
Grade
UNS
Pipe
Where it is used
F304 / F304L
S30400 / S30403
TP304 / TP304L
General process, water and food lines.
F304H
S30409
TP304H
High-temperature service above 525 °C.
F316 / F316L
S31600 / S31603
TP316 / TP316L
Chemical, pharmaceutical and coastal plants.
F317L
S31703
TP317L
Pulp, paper and flue-gas service.
F321 / F321H
S32100 / S32109
TP321 / TP321H
Stabilised for 400–800 °C service.
F347
S34700
TP347
Refinery and high-temperature steam lines.
F310
S31000
TP310S
Furnace and heat-treatment piping.
F904L
N08904
N08904
Sulphuric and phosphoric acid lines.
Duplex & Super Duplex Flanges
Duplex and super duplex flanges for seawater, offshore and chemical lines, forged to ASTM A182.
Forged flanges
ASTM A182 · ASME SA182
Corrosion tests
ASTM A923 · ASTM G48
Matching pipe
ASTM A790 · A928
Grade
UNS
Pipe
Where it is used
F51 (2205)
S31803
A790 S31803
Chemical, offshore and desalination piping.
F60 (2205)
S32205
A790 S32205
As F51, with tighter chemistry.
F53 (2507)
S32750
A790 S32750
Seawater and high-chloride lines.
F55
S32760
A790 S32760
Seawater, firewater and sour service.
F44 (6Mo)
S31254
A312 S31254
Super-austenitic, for seawater and bleach plants.
Carbon Steel Flanges
A105 is the standard carbon steel flange. A350 grades are impact tested for low temperature, and A694 matches high-yield line pipe.
General & high temperature
ASTM A105 · ASME SA105
Low temperature
ASTM A350
High yield
ASTM A694 · MSS SP-44
Grade
Service
Pipe
Where it is used
A105
General & high temperature
A106 Gr. B · A53 Gr. B
The standard carbon steel flange for process and utility lines.
A350 LF2 Cl. 1
Impact tested to −46 °C
A333 Gr. 6
Low-temperature and cold-climate lines.
A350 LF3
Impact tested to −101 °C
A333 Gr. 3
3½ % nickel steel for colder service.
A694 F42 – F70
High yield
API 5L X42 – X70
Oil and gas transmission pipelines.
A516 Gr. 70
Plate flanges
–
Large, low-pressure flanges and ring flanges cut from plate.
Alloy Steel Flanges
Chromium-molybdenum flanges for steam and refinery lines. The F grade matches the P grade of the pipe.
Forged flanges
ASTM A182 · ASME SA182
Heat treatment
Normalised & tempered
Matching pipe
ASTM A335
Grade
Composition
Pipe
Where it is used
F5
5Cr – ½Mo
A335 P5
Refinery lines with hot sulphur-bearing streams.
F9
9Cr – 1Mo
A335 P9
Higher-temperature refinery and heater piping.
F11 Cl. 2
1¼Cr – ½Mo
A335 P11
Steam lines and headers.
F12
1Cr – ½Mo
A335 P12
Boiler and steam piping.
F22 Cl. 3
2¼Cr – 1Mo
A335 P22
High-pressure steam and hydrogen service.
F91
9Cr – 1Mo – V
A335 P91
Main steam and hot reheat lines.
High Nickel Alloy Flanges
Nickel-alloy flanges are forged to ASTM B564, which identifies each alloy by its UNS number; Alloy 20 flanges are made to B462.
Forged flanges
ASTM B564 · B462
ASME
SB564 · SB462
Matching pipe
B165 · B167 · B444 · B407 · B423 · B622
Alloy
Flange
Pipe
Where it is used
Monel 400
B564 N04400
B165
Seawater and hydrofluoric acid lines.
Inconel 600
B564 N06600
B167
High-temperature and caustic service.
Inconel 625
B564 N06625
B444
Seawater, flue-gas and chemical lines.
Incoloy 800 / 800H
B564 N08800 / N08810
B407
Furnace and petrochemical piping.
Incoloy 825
B564 N08825
B423
Sulphuric and phosphoric acid lines.
Hastelloy C276
B564 N10276
B622
Wet chlorine and mixed-acid service.
Alloy 20
B462 N08020
B729
Sulphuric acid handling.
Titanium Flanges
Titanium flanges for seawater, chlor-alkali and chemical plant. Lap joint flanges in carbon steel over titanium stub ends are a common way to save cost.
Forged flanges
ASTM B381
Plate flanges
ASTM B265
Matching pipe
ASTM B861 · B862
Grade
Flange
Pipe
Where it is used
Grade 2
B381 F2
B861 / B862 Gr. 2
General corrosion service and seawater lines.
Grade 7
B381 F7
B861 / B862 Gr. 7
Reducing acids.
Grade 12
B381 F12
B861 / B862 Gr. 12
Crevice-corrosion resistance at higher temperature.
Copper-Nickel Flanges
Copper-nickel flanges for seawater cooling and firewater systems on ships and offshore platforms.
Dimensions
EEMUA 145 · ASME B16.5
Material
ASTM B151 · B171
Matching pipe
EEMUA 144 · ASTM B466
Alloy
UNS
Pipe
Where it is used
Copper-Nickel 90/10
C70600
EEMUA 144 · B466
Seawater cooling and firewater lines.
Copper-Nickel 70/30
C71500
B466
Higher-velocity seawater service.
Aluminium Flanges
Forged aluminium flanges for cryogenic, chemical and lightweight piping.
Forged flanges
ASTM B247
Dimensions
ASME B16.5
Matching pipe
ASTM B241
Alloy
Temper
Pipe
Where it is used
6061
T6
B241 6061
General structural and process piping.
5083
O / H112
B241 5083
Marine and cryogenic service.
Swipe the table sideways to see every column
These are the grades asked for most, not the limit of what we supply. For other families and product forms, see Materials & Grades.
Chemical Composition
What Is in the Forging
Composition limits for the most common flange grades, in percent by weight. A single figure is a maximum; a range shows minimum and maximum.
Grade
C
Mn
P
S
Si
Cr
Ni
Mo
Others
Carbon steel
A105
0.35
0.60 – 1.05
0.035
0.040
0.10 – 0.35
0.30
0.40
0.12
Cu 0.40 · V 0.08
A350 LF2
0.30
0.60 – 1.35
0.035
0.040
0.15 – 0.30
0.30
0.40
0.12
Cu 0.40 · V 0.08 · Nb 0.02
Alloy steel · ASTM A182
F11 Cl. 2
0.10 – 0.20
0.30 – 0.80
0.040
0.040
0.50 – 1.00
1.00 – 1.50
–
0.44 – 0.65
–
F22 Cl. 3
0.05 – 0.15
0.30 – 0.60
0.040
0.040
0.50
2.00 – 2.50
–
0.87 – 1.13
–
F91
0.08 – 0.12
0.30 – 0.60
0.020
0.010
0.20 – 0.50
8.00 – 9.50
0.40
0.85 – 1.05
V 0.18 – 0.25 · Nb 0.06 – 0.10 · N 0.030 – 0.070
Stainless steel · ASTM A182
F304
0.08
2.00
0.045
0.030
1.00
18.0 – 20.0
8.0 – 11.0
–
N 0.10
F304L
0.030
2.00
0.045
0.030
1.00
18.0 – 20.0
8.0 – 12.0
–
N 0.10
F316
0.08
2.00
0.045
0.030
1.00
16.0 – 18.0
10.0 – 14.0
2.00 – 3.00
N 0.10
F316L
0.030
2.00
0.045
0.030
1.00
16.0 – 18.0
10.0 – 14.0
2.00 – 3.00
N 0.10
F321
0.08
2.00
0.045
0.030
1.00
17.0 – 19.0
9.0 – 12.0
–
Ti 5×(C+N) – 0.70 · N 0.10
Duplex & super duplex · ASTM A182
F51
0.030
2.00
0.030
0.020
1.00
21.0 – 23.0
4.5 – 6.5
2.5 – 3.5
N 0.08 – 0.20
F53
0.030
1.20
0.035
0.020
0.80
24.0 – 26.0
6.0 – 8.0
3.0 – 5.0
N 0.24 – 0.32 · Cu 0.50
F55
0.030
1.00
0.030
0.010
1.00
24.0 – 26.0
6.0 – 8.0
3.0 – 4.0
N 0.20 – 0.30 · Cu 0.50 – 1.00 · W 0.50 – 1.00
Swipe the table sideways to see every element
Values are shown for reference and follow the specifications named in the table. Limits are revised from time to time, so the edition of the specification on your order, and the mill test certificate supplied with the material, always govern.
Mechanical Properties
Strength & Hardness of Flange Grades
Minimum tensile and yield strength and the hardness limits of the common forging grades. Hardness limits matter for sour service, where hard material can crack.
Grade
Tensile strength MPa
Yield strength, min MPa
Elongation, min %
Hardness HBW
Carbon steel
A105
485 min
250
22
137 – 187
A350 LF2 Cl. 1
485 – 655
250
22
197 max
Alloy steel
A182 F11 Cl. 2
485 min
275
20
143 – 207
A182 F22 Cl. 3
515 min
310
20
156 – 207
A182 F91
585 min
415
20
248 max
Stainless steel
F304 · F316 · F321 · F347
515 min
205
30
–
F304L · F316L
485 min
170
30
–
Duplex & super duplex
F51
620 min
450
25
290 max
F53
800 min
550
15
310 max
F55
750 min
550
25
310 max
Swipe the table sideways to see every column
Actual test results are reported on the mill test certificate. For sour service to NACE MR0175 / ISO 15156, state it on the order so hardness is controlled and reported.
Dimensions
Flange Dimension Chart, ASME B16.5
Outside diameter, thickness, bolting and hub length for weld neck flanges, in mm. The outside diameter, bolt circle and bolting are the same for every flange type of the same size and class.
Front view (left) and side view of a weld neck flange (right). The orange ring is the raised face and the dashed circle is the bolt circle; tf is the flange thickness and Y the length through the hub.
OD · outside diameter
The overall diameter of the flange.
Bolt circle & holes
The circle through the bolt-hole centres, with the number and size of bolts. These must match on both flanges of a joint.
Raised face
The diameter of the gasket seating face.
tf · thickness & Y · hub length
Measured without the raised face, which adds 1.6 mm for Class 150 and 300.
Showing Class 150 · dimensions in mm, bolt sizes in inches
NPSinch
ODmm
Thicknesstf, min
Raised facediameter
Bolt circlediameter
Boltsnumber
Bolt sizeinch
Bolt holediameter
Weld neckY, hub length
Class 150
1/2
90
9.6
34.9
60.3
4
1/2
15.9
46
3/4
100
11.2
42.9
69.9
4
1/2
15.9
51
1
110
12.7
50.8
79.4
4
1/2
15.9
54
1 1/4
115
14.3
63.5
88.9
4
1/2
15.9
56
1 1/2
125
15.9
73.0
98.4
4
1/2
15.9
60
2
150
17.5
92.1
120.7
4
5/8
19.1
62
2 1/2
180
20.7
104.8
139.7
4
5/8
19.1
68
3
190
22.3
127.0
152.4
4
5/8
19.1
68
3 1/2
215
22.3
139.7
177.8
8
5/8
19.1
70
4
230
22.3
157.2
190.5
8
5/8
19.1
75
5
255
22.3
185.7
215.9
8
3/4
22.2
87
6
280
23.9
215.9
241.3
8
3/4
22.2
87
8
345
27.0
269.9
298.5
8
3/4
22.2
100
10
405
28.6
323.8
362.0
12
7/8
25.4
100
12
485
30.2
381.0
431.8
12
7/8
25.4
113
14
535
33.4
412.8
476.3
12
1
28.6
125
16
595
35.0
469.9
539.8
16
1
28.6
125
18
635
38.1
533.4
577.9
16
1 1/8
31.8
138
20
700
41.3
584.2
635.0
20
1 1/8
31.8
143
24
815
46.1
692.2
749.3
20
1 1/4
34.9
151
Class 300
1/2
95
12.7
34.9
66.7
4
1/2
15.9
51
3/4
115
14.3
42.9
82.6
4
5/8
19.1
56
1
125
15.9
50.8
88.9
4
5/8
19.1
60
1 1/4
135
17.5
63.5
98.4
4
5/8
19.1
64
1 1/2
155
19.1
73.0
114.3
4
3/4
22.2
67
2
165
20.7
92.1
127.0
8
5/8
19.1
68
2 1/2
190
23.9
104.8
149.2
8
3/4
22.2
75
3
210
27.0
127.0
168.3
8
3/4
22.2
78
3 1/2
230
28.6
139.7
184.2
8
3/4
22.2
79
4
255
30.2
157.2
200.0
8
3/4
22.2
84
5
280
33.4
185.7
235.0
8
3/4
22.2
97
6
320
35.0
215.9
269.9
12
3/4
22.2
97
8
380
39.7
269.9
330.2
12
7/8
25.4
110
10
445
46.1
323.8
387.4
16
1
28.6
116
12
520
49.3
381.0
450.8
16
1 1/8
31.8
129
14
585
52.4
412.8
514.4
20
1 1/8
31.8
141
16
650
55.6
469.9
571.5
20
1 1/4
34.9
144
18
710
58.8
533.4
628.6
24
1 1/4
34.9
157
20
775
62.0
584.2
685.8
24
1 1/4
34.9
160
24
915
68.3
692.2
812.8
24
1 1/2
41.3
167
Swipe the chart sideways to see every dimension
Class 600 to 2500, sizes above NPS 24 to ASME B16.47 Series A and B, and EN 1092-1 PN flanges are supplied to their own dimension tables; send the size and rating and we will confirm.
Bolts & Gaskets
Complete the Joint With the Right Bolting
A flanged joint is the flanges, the gasket, the stud bolts and the nuts. We supply the whole set, matched to the service. The number and size of bolts for each flange are in the dimension chart above.
Service
Stud bolts · nuts
Typical gasket
Carbon steel, general service
A193 B7 · A194 2H
Spiral wound, stainless steel with graphite filler, inner and outer rings.
Low temperature, to −101 °C
A320 L7 · A194 Gr. 7
Spiral wound or ring joint, matched to the flange material.
Stainless steel lines
A193 B8 / B8M · A194 8 / 8M
Spiral wound, 316L with graphite or PTFE filler.
High temperature
A193 B16 · A194 Gr. 4 or 7
Spiral wound with graphite, or ring joint.
Sour service, NACE MR0175
A193 B7M · A194 2HM
Spiral wound or ring joint in a corrosion-resistant alloy.
High pressure, RTJ flanges
A193 B7 · A194 2H
Ring joint, soft iron or stainless: R, RX or BX type.
Swipe the table sideways to see every column
Spiral wound gaskets
Metal winding with a soft filler, to ASME B16.20. The standard gasket for raised face flanges in process piping.
Ring joint gaskets
Solid metal rings, oval or octagonal (R), and pressure-energised RX and BX types, to ASME B16.20.
Sheet gaskets
Compressed fibre, graphite or PTFE, cut to ASME B16.21. For flat face and low-pressure joints.
A starting point for choosing the flange type and facing. The material follows the pipe; the class follows the pressure and temperature.
Situation
Typical choice
Why
High pressure, high temperature or cyclic service
Weld neck
The tapered hub spreads stress, and the butt weld can be radiographed.
Low-pressure utility and water lines
Slip on
Cheaper and easier to align; lower strength and fatigue life than weld neck.
Small-bore, high-pressure lines
Socket weld
Smooth bore and a strong joint without a butt weld.
No welding allowed on site
Threaded
Screwed on; for small bore and non-cyclic service.
Frequent dismantling or costly alloy lines
Lap joint + stub end
Bolt holes line up easily; the loose flange can be carbon steel.
Closing a line or a nozzle
Blind
A solid, bolted closure that can be removed.
Positive isolation of equipment
Spectacle blind
Turned to show which way the line is set: open or closed.
Flow measurement
Orifice flanges
Pressure taps drilled on each side of the orifice plate.
Vessel and column nozzles
Long weld neck
The long barrel forms the nozzle neck.
Most process piping
Raised face, serrated
Works with spiral wound and sheet gaskets.
Class 600 and above, oil & gas
Ring type joint
Metal ring gasket seals reliably at high pressure.
Mating cast iron or plastic flanges
Flat face
Full-face contact avoids cracking the brittle flange.
Swipe the table sideways to see every column
This guide is for orientation only. The choice of flange, class and material depends on the full service conditions and the governing piping code, and remains the responsibility of the design engineer.
Testing & Documents
Tested, Traceable & Documented
Every flange is traceable to its heat number and leaves with its mill test certificate. These tests are arranged when your order calls for them.
MTC EN 10204Type 3.1 & 3.2 certificates
PMI TestingConfirms the alloy grade
Ultrasonic TestSoundness of the forging
Hardness TestBrinell, incl. NACE sour service
IGC TestIntergranular corrosion, ASTM A262
Dimensional CheckOD, bolt circle, bore and face finish
What does a flange pressure class such as Class 150 or Class 300 mean?
The class is a pressure rating designation under ASME B16.5, not a pressure in psi. The pressure a flange may carry depends on its class, its material group and the temperature. For example, an A105 carbon steel Class 150 flange is rated 19.6 bar at 38 °C, falling to 10.2 bar at 300 °C. See the pressure ratings.
What is the difference between a weld neck and a slip on flange?
A weld neck flange has a long tapered hub that is butt welded to the pipe, which spreads stress smoothly and allows the weld to be radiographed. It is preferred for high pressure, high temperature and cyclic service. A slip on flange slides over the pipe and is fillet welded inside and out. It is cheaper and easier to align, but has lower strength and fatigue life.
When should I use a raised face or a ring type joint flange?
Raised face (RF) is the most common facing and is used with spiral wound and sheet gaskets in most process piping. Ring type joint (RTJ) flanges have a groove that holds a solid metal ring gasket; they are used at high pressure and temperature, typically Class 600 and above, and in oil and gas service. See the facings.
Can ASME flanges be bolted to EN or DIN flanges?
Generally not. ASME B16.5 flanges are made in pressure classes with inch-based bolt circles, while EN 1092-1 flanges are made in PN ratings with metric bolt circles. Bolt circles, bolt sizes and hole counts usually differ, so the two should not be mixed unless the dimensions are checked for the specific size.
Which bolts and gaskets go with a flange?
For carbon steel flanges in general service, ASTM A193 B7 stud bolts with A194 2H nuts and a spiral wound gasket are the usual choice. Stainless steel lines use A193 B8 or B8M studs with A194 8 or 8M nuts. Low temperature service uses A320 L7 studs, and sour service B7M studs with 2HM nuts. See bolts & gaskets.
What documents are supplied with flanges?
Every lot is supplied with a mill test certificate to EN 10204 Type 3.1 or 3.2, traceable to the heat number stamped on each flange, along with any additional test reports ordered, such as ultrasonic testing, PMI or hardness. When third-party inspection is called for, the agency's inspection release note is included. More on our quality & inspection page.
Complete the Line
Everything That Goes With the Flange
Pipe, fittings, valves and fasteners in matching grades, so every joint comes from one supplier with one set of documents.
Send the type, size, class, facing and grade. We will confirm availability and quote, with bolting and gaskets if you need them, and the mill test certificate and inspection you require.
