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Weldoflange

Weldoflange : Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

High-Quality ASME B16.5 Weldoflange Manufacturer – Offering Carbon Steel, Stainless Steel, Alloy Steel, and Nickel Alloy Weldoflanges. Available in sizes from ½” to 24” and pressure classes 150# to 2500#, suitable for oil & gas, petrochemical, and industrial piping applications.

ASME B16.5 Weldoflange Manufacturer

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd, is a trusted manufacturer and supplier of high-quality Weldoflanges designed for industrial piping systems. Specializing in ASME B16.5 compliant Weldoflanges, our products are precision-engineered to meet stringent standards for carbon steel, stainless steel, alloy steel, and nickel alloys. Each flange is manufactured with strict adherence to dimensional accuracy, hub reinforcement, and surface finish requirements, ensuring reliable performance in high-pressure, high-temperature, and corrosive environments.

With a commitment to delivering durable and technically superior products, We serves a diverse range of industries, including oil & gas, petrochemical, power generation, and chemical processing.

Our extensive range of Weldoflanges, available in sizes ½” to 24” and pressure classes 150# to 2500#, is designed for seamless integration into complex piping networks. By combining advanced manufacturing processes, rigorous quality checks, and responsive customer support, we ensure our clients receive flanges that guarantee safety, reliability, and long-term operational efficiency.

A Weldoflange is an integrally reinforced branch outlet flange designed to provide a flanged connection on a pressure pipeline without requiring a full pipe tee. Essentially, it combines a buttweld hub (similar to a weldolet) with a welding neck flange, allowing the branch line to be welded onto the main pipe while maintaining standard flange dimensions for easy bolting.

The Weldo flange works by transferring internal pressure loads from the branch line to the parent pipe, with the hub providing reinforcement at the junction to prevent stress concentration. This design ensures leak-proof connections and enables safe isolation, maintenance, or integration of instrumentation, valves, or auxiliary piping in high-pressure systems.

ASME B16.5

Weldo Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

Weldoflange

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.47, MSS SP - 97

Weldoflange – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Class 150 – 2500, Size ½”–48” General purpose, corrosion-resistant piping
ASTM A182 F316 / F316L / F316H Class 150 – 2500, Size ½”–48” Chemical, marine, food & pharma industries
ASTM A182 F321 / F321H Class 150 – 1500, Size ½”–24” High temperature, stabilized service
Carbon Steel ASTM A105 (Forged CS) Class 150 – 2500, Size ½”–48” Pressure piping, oil & gas, general industries
ASTM A350 LF2 (Low Temp CS) Class 150 – 1500, Size ½”–24” Cryogenic & low temperature applications
Alloy Steel ASTM A182 F11 / F22 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines
ASTM A182 F91 Class 150 – 2500, Size ½”–24” High-temperature, power generation
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Class 150 – 2500, Size ½”–24” Heat exchangers, chemical, aerospace
ASTM B564 Monel 400 / K500 Class 150 – 2500, Size ½”–24” Marine, seawater handling, pumps
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, desalination, seawater systems
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.5 Weldoflange – Dimensions NPS 1/2 to 24

Dimensions of ANSI/ASME B16.5 Weldoflange
NPS A B C D
1/2 3/4
19.05		 1.3/8
34.93		 15/16
23.81		 5/8
15.88
3/4 7/8
22.23		 1.5/8
41.28		 1.3/16
30.16		 13/16
20.64
1 1.1/16
26.99		 2
50.80		 1.7/16
36.51		 1.1/32
26.19
1.1/4 1.1/4
31.75		 2.3/8
60.3		 1.3/4
44.45		 1.3/8
34.93
1.1/2 1.5/16
33.34		 2.7/8
73		 2
50.80		 1.5/8
41.28
2 1.1/2
38.10		 3.1/2
88.90		 2.9/16
65.09		 2.1/16
52.39
2.1/2 1.5/8
41.28		 4.1/16
103.19		 3
76.20		 2.7/16
61.91
3 1.3/4
44.45		 4.13/16
122.24		 3.11/16
93.66		 3.1/16
77.79
3.1/2 2
50.80		 5.3/8
136.53		 3.7/8
98.43		 3.9/16
90.49
4 2
50.80		 6
152.40		 4.3/4
120.65		 4
101.60
5 2.1/4
57.15		 7.1/8
180.98		 5.9/16
141.29		 5.1/16
128.59
6 2.3/8
60.3		 8.1/2
215.90		 6.11/16
169.86		 6.1/16
153.99
8 2.3/4
69.85		 10.3/8
263.53		 8.11/16
220.66		 7.15/16
201.61
10 3.1/16
77.79		 12.9/16
319.09		 10.13/16
274.64		 10
254.00
12 3.3/8
85.73		 14.7/8
377.83		 12.13/16
325.44		 12
304.80
14 3.1/2
88.90		 16.1/8
409.58		 14.1/16
357.19		 13.1/4
336.55
16 3.11/16
93.66		 18.1/4
463.55		 16.1/16
407.99		 15.1/4
387.35
18 4.1/16
103.19		 20.3/4
527.05		 18.5/8
473.08		 17.1/4
438.15
20 4.5/8
117.48		 23.1/16
585.79		 20.1/16
509.59		 19.1/4
488.95
24 5.3/8
136.53		 27.7/8
708.03		 25.1/8
638.18		 23.1/4
590.55

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch ½”

RATING NOMINAL PIPE SIZE FROM 3/4″ TO 36″
Bore schedule B C D E Weight [kg]
STD 15,8 18,5 0,9
150# XS 13,8 17,6 88,9 11,2 0,9
160 11,7 11,7 0,9
XXS 6,4 6,4 0,9
Bore schedule B C D E Weight [kg]
STD 15,8 18,5 1,2
300# XS 13,8 17,6 95,3 14,3 1,2
160 11,7 11,7 1,2
XXS 6,4 6,4 1,2
Bore schedule B C D E Weight [kg]
STD 15,8 18,5 1,3
600# XS 13,8 17,6 95,3 14,3 1,3
160 11,7 11,7 1,3
XXS 6,4 6,4 1,3
Bore schedule B C D E Weight [kg]
STD 15,8 18,5 2,4
900# XS 13,8 17,6 120,6 22,4 2,4
160 11,7 11,7 2,4
XXS 6,4 6,4 2,4
Bore schedule B C D E Weight [kg]
STD 15,8 18,5 2,4
1500# XS 13,8 17,6 120,6 22,4 2,4
160 11,7 11,7 2,4
XXS 6,4 6,4 2,4
Bore schedule B C D E Weight [kg]
STD 15,8 18,5 3,6
2500# XS 13,8 17,6 133,4 30,2 3,6
160 11,7 11,7 3,6
XXS 6,4 6,4 3,6

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch ¾”

RATING NOMINAL PIPE SIZE FROM 1″ TO 36″
Bore schedule B C D E Weight [kg]
STD 21 23,8 1,2
150# XS 18,9 22,8 98,6 12,7 1,2
160 15,6 15,6 1,4
XXS 11,1 11,1 1,5
Bore schedule B C D E Weight [kg]
STD 21 23,8 1,7
300# XS 18,9 22,8 117,4 15,8 1,9
160 15,6 15,6 2
XXS 11,1 11,1 2,1
Bore schedule B C D E Weight [kg]
STD 21 23,8 2
600# XS 18,9 22,8 117,4 15,8 2,1
160 15,6 15,6 2,2
XXS 11,1 11,1 2,2
Bore schedule B C D E Weight [kg]
STD 21 23,8 3,1
900# XS 18,9 22,8 130 25,4 3,2
160 15,6 15,6 3,2
XXS 11,1 11,1 3,3
Bore schedule B C D E Weight [kg]
STD 21 23,8 3,1
1500# XS 18,9 22,8 130 25,4 3,2
160 15,6 15,6 3,2
XXS 11,1 11,1 3,3
Bore schedule B C D E Weight [kg]
STD 21 23,8 4,4
2500# XS 18,9 22,8 139,7 31,8 4,5
160 15,6 15,6 4,5
XXS 11,1 11,1 4,6

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch 1”

RATING NOMINAL PIPE SIZE FROM 1.1/2″ TO 36″
Bore schedule B C D E Weight [kg]
STD 26,6 30 1,7
150# XS 24,3 28,8 108 14,3 1,7
160 20,7 20,7 2
XXS 15,2 15,2 2,2
Bore schedule B C D E Weight [kg]
STD 26,6 30 2,3
300# XS 24,3 28,8 124 17,6 2,5
160 20,7 20,7 2,6
XXS 15,2 15,2 2,8
Bore schedule B C D E Weight [kg]
STD 26,6 30 2,6
600# XS 24,3 28,8 124 17,6 2,7
160 20,7 20,7 2,8
XXS 15,2 15,2 3
Bore schedule B C D E Weight [kg]
STD 26,6 30 4,5
900# XS 24,3 28,8 149,4 28,5 4,6
160 20,7 20,7 4,7
XXS 15,2 15,2 4,8
Bore schedule B C D E Weight [kg]
STD 26,6 30 4,5
1500# XS 24,3 28,8 149,4 28,5 4,6
160 20,7 20,7 4,7
XXS 15,2 15,2 4,8
Bore schedule B C D E Weight [kg]
STD 26,6 30 6,1
2500# XS 24,3 28,8 158,8 35,1 6,2
160 20,7 20,7 6,2
XXS 15,2 15,2 6,3

ANSI/ASME B16.5 Weldoflange – Dimensions Branch 1½”

RATING NOMINAL PIPE SIZE FROM 2″ TO 36″
Bore schedule B C D E Weight [kg]
STD 40,9 44,6 3,1
150# XS 38,1 43,2 127 17,5 3,3
160 34 34 3,5
XXS 28 28 3,8
Bore schedule B C D E Weight [kg]
STD 40,9 44,6 4,1
300# XS 38,1 43,2 155,5 20,6 4,5
160 34 34 4,7
XXS 28 28 5
Bore schedule B C D E Weight [kg]
STD 40,9 44,6 4,9
600# XS 38,1 43,2 155,5 22,4 5
160 34 34 5,2
XXS 28 28 5,5
Bore schedule B C D E Weight [kg]
STD 40,9 44,6 7,2
900# XS 38,1 43,2 177,8 31,8 7,4
160 34 34 7,6
XXS 28 28 7,9
Bore schedule B C D E Weight [kg]
STD 40,9 44,6 7,2
1500# XS 38,1 43,2 177,8 31,8 7,4
160 34 34 7,6
XXS 28 28 7,9
Bore schedule B C D E Weight [kg]
STD 40,9 44,6 12
2500# XS 38,1 43,2 203,2 44,5 12
160 34 34 12,2
XXS 28 28 12,5

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch 2″

RATING NOMINAL PIPE SIZE FROM 3″ TO 36″
Bore schedule B C D E Weight [kg]
STD 52,5 56,4 4,1
150# XS 49,2 54,8 152,4 19,1 4,8
160 42,8 42,8 5,1
XXS 38,2 38,2 5,5
Bore schedule B C D E Weight [kg]
STD 52,5 56,4 5,5
300# XS 49,2 54,8 165,1 22,4 5,8
160 42,8 42,8 6,1
XXS 38,2 38,2 6,5
Bore schedule B C D E Weight [kg]
STD 52,5 56,4 6,2
600# XS 49,2 54,8 165,1 25,4 6,5
160 42,8 42,8 7
XXS 38,2 38,2 7,2
Bore schedule B C D E Weight [kg]
STD 52,5 56,4 13
900# XS 49,2 54,8 215,9 38,1 13,3
160 42,8 42,8 13,6
XXS 38,2 38,2 13,9
Bore schedule B C D E Weight [kg]
STD 52,5 56,4 13
1500# XS 49,2 54,8 215,9 38,1 13,3
160 42,8 42,8 13,6
XXS 38,2 38,2 13,9
Bore schedule B C D E Weight [kg]
STD 52,5 56,4 18,4
2500# XS 49,2 54,8 235 50,8 18,6
160 42,8 42,8 19
XXS 38,2 38,2 19,3

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch 3”

RATING NOMINAL PIPE SIZE FROM 4″ TO 36″
Bore schedule Length D E Weight [kg]
150# 10-STD 115 7,5
XS-80 115 191 23,9 7,5
160-XXS 145 8
Bore schedule Length D E Weight [kg]
300# 10-STD 125 10
XS-80 125 210 28,5 10
160-XXS 150 11
Bore schedule Length D E Weight [kg]
600# 10-STD 135 13,5
XS-80 135 210 38,2 13,5
160-XXS 165 14,5
Bore schedule Length D E Weight [kg]
900# 10-STD 155 17
XS-80 155 241 44,5 17
160-XXS 180 18
Bore schedule Length D E Weight [kg]
1500# 10-STD 170 25
XS-80 170 267 54,1 25
160-XXS 200 26
Bore schedule Length D E Weight [kg]
2500# 10-STD 220 45,5
XS-80 220 305 72,9 45,5
160-XXS 250 51

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch 4”

RATING NOMINAL PIPE SIZE FROM 5″ TO 36″
Bore schedule Length D E Weight [kg]
150# 10-STD 130 11,5
XS-80 130 229 23,9 11,5
160-XXS 160 13
Bore schedule Length D E Weight [kg]
300# 10-STD 140 16
XS-80 140 254 31,8 16
160-XXS 170 17
Bore schedule Length D E Weight [kg]
600# 10-STD 160 24
XS-80 160 273 44,5 24
160-XXS 195 26
Bore schedule Length D E Weight [kg]
900# 10-STD 170 28
XS-80 170 292 50,8 28
160-XXS 205 29,5
Bore schedule Length D E Weight [kg]
1500# 10-STD 180 38
XS-80 180 311 60,2 38
160-XXS 215 40
Bore schedule Length D E Weight [kg]
2500# 10-STD 250 70,5
XS-80 250 356 82,4 70,5
160-XXS 281 72

ANSI/ASME B16.5 Weldo Flange – Dimensions Branch 6”

RATING NOMINAL PIPE SIZE FROM 8″ TO 36″
Bore schedule Length D E Weight [kg]
150# 10-STD 150 23,5
XS-80 170 279 25,4 25
160-XXS 195 27
Bore schedule Length D E Weight [kg]
300# 10-STD 160 36,6
XS-80 175 318 36,6 37,5
160-XXS 205 39
Bore schedule Length D E Weight [kg]
600# 10-STD 185 49,5
XS-80 200 356 54,1 51
160-XXS 230 53,2
Bore schedule Length D E Weight [kg]
900# 10-STD 210 62,5
XS-80 225 381 62 64,3
160-XXS 250 66
Bore schedule Length D E Weight [kg]
1500# 10-STD 240 87,5
XS-80 255 394 88,9 89
160-XXS 285 91,2
Bore schedule Length D E Weight [kg]
2500# 10-STD 340 186
XS-80 360 483 114,3 189
160-XXS 385 192,5

Weldoflange Weight Chart (lbs) – Pressure Class 150 to 2500

NPS (inch) 150# (lbs) 300# (lbs) 400# (lbs) 600# (lbs) 900# (lbs) 1500# (lbs) 2500# (lbs)
1/2 5 6 7 8 10 12 15
3/4 6 7 9 10 12 15 18
1 8 10 12 14 18 22 28
1 1/4 12 15 18 22 28 34 42
1 1/2 14 18 22 26 34 42 52
2 20 25 30 36 46 56 70
2 1/2 28 34 42 50 64 78 98
3 36 44 52 64 82 100 126
4 55 66 78 96 124 152 190
6 95 114 136 168 218 266 334
8 150 180 216 268 348 428 534
10 220 264 316 396 514 632 794
12 320 384 460 576 748 920 1156
14 420 504 600 752 980 1200 1510
16 540 648 780 976 1270 1550 1960
18 700 840 1010 1260 1640 2000 2520
20 880 1056 1270 1580 2060 2520 3180
24 1300 1560 1880 2340 3040 3720 4680

Weldoflange Tolerances as per ANSI / ASME B16.5,16.47

Feature / Dimension NPS / Range Tolerance / Allowable Variation
Outside Diameter (OD) ½”–24″ ±1/16″ (±1.6 mm)
26″–60″ ±1/8″ (±3.2 mm)
Bolt Circle Diameter (PCD) 150#–300# ±1/32″ (±0.8 mm)
400#–2500# ±1/16″ (±1.6 mm)
Bolt Hole Diameter Up to 1″ +1/64″ / -0″ (+0.4 mm / 0 mm)
1″–2″ +1/32″ / -0″ (+0.8 mm / 0 mm)
Above 2″ +1/16″ / -0″ (+1.6 mm / 0 mm)
Raised Face Diameter (RF) All sizes ±1/32″ (±0.8 mm)
Raised Face Height (RF) All sizes ±1/64″ (±0.4 mm)
Flange Thickness (B) 150#–600# ±1/16″ (±1.6 mm)
900#–2500# ±1/8″ (±3.2 mm)
Hub / Weld Neck Bore (Bore) Up to 12″ ±1/32″ (±0.8 mm)
Above 12″ ±1/16″ (±1.6 mm)
Face Flatness / Runout RF Max 0.002″ per inch of diameter
RTJ Max 0.001″ per inch of diameter
What are the installation and maintenance considerations?
  • Installation:
    1. Ensure pipe end bevel matches flange bore for proper butt-welding.
    2. Torque bolts uniformly to prevent flange distortion.
    3. Use correct gasket type (RF/RTJ) as per pressure and temperature.
  • Maintenance:
    1. Periodically check for bolt torque and flange alignment.
    2. Inspect for corrosion or erosion, especially in high-temperature or chemical service.
    3. Replace gaskets during maintenance to prevent leakage.
  • Hydrostatic Test: Confirms flange strength at working pressure.
  • Radiographic (RT) or Ultrasonic (UT) Testing: Checks weld quality and internal defects.
  • Magnetic Particle (MT) or Dye Penetrant (PT) Testing: Detects surface cracks.
  • Dimensional Inspection: Confirms OD, bolt hole alignment, raised face height, and hub bore tolerances.
  • Stress Distribution: WN flange hub transfers stress gradually.
  • High-Pressure Applications: Can withstand higher pressures than SO or SW flanges.
  • Low Turbulence: Smooth bore reduces flow disruption inside piping.
  • Long-Term Reliability: Reduced chance of flange lifting under cyclic load.
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