ANSI /ASME B16.5 class 300 blind flange

Blind flange is used to blank off pipelines,valves and pumps,it can also be used as an inspection cover.It is sometimes referred to as a blank flange.ANSI/ASME B16.5 standard covers pressure,temperature,ratings, materials,dimensions,tolerances,marking,testing,and methods of designating openings for pipe flanges and flanged fittings.Blind flange dimensions are covered in ANSI/ASME B16.5 for size NPS ½” to 24″.

ANSI/ ASME B16.5 Class 300 Blind Flange Dimensions

ANSI ASME B16.5 Class 300 Blind Flange Dimensions

ANSI ASME B16.5 Class 300 Blind Flange Dimensions

Nominal Pipe Size Pipe Flange Data Raised Face Drilling Data Weight
A C G H I J
Outside Diameter Overall Diameter Flange Thickness min Face Diameter Number of Holes Bolt Hole Diameter Diameter of Circle of Holes kg/piece
in mm in mm in mm in mm in mm in mm
½ 0.840 21.30 3.750 95.20 0.560 14.20 1.380 35.10 4 0.620 15.70 2.620 66.55 0.64
¾ 1.050 26.70 4.620 117.3 0.620 15.70 1.690 42.90 4 0.750 19.00 3.250 82.50 1.11
1 1.315 33.40 4.880 123.9 0.690 17.50 2.000 50.80 4 0.750 19.00 3.500 88.90 1.39
1.660 42.20 5.250 133.3 0.750 19.00 2.500 63.50 4 0.750 19.00 3.880 98.50 1.79
1.900 48.30 6.120 155.4 0.810 20.60 2.880 73.15 4 0.880 22.3 4.500 114.3 2.66
2 2.375 60.30 6.500 165.1 0.880 22.30 3.620 91.90 8 0.750 19.10 5.000 127.0 3.18
2.875 73.00 7.500 190.5 1.000 25.40 4.120 104.6 8 0.880 22.30 5.880 1.493 4.85
3 3.500 88.90 8.250 209.5 1.120 28.40 5.000 127.0 8 0.880 22.30 6.620 168.1 6.81
4.000 101.6 9.000 228.6 1.190 30.20 5.500 139.7 8 0.880 22.30 7.250 184.1 8.71
4 4.500 114.3 10.00 254.0 1.250 31.70 6.190 157.2 8 0.880 22.30 7.800 200.1 11.5
5 5.563 141.3 11.00 279.4 1.380 35.00 7.310 185.7 8 0.880 22.30 9.250 234.9 15.6
6 6.625 168.3 12.50 317.5 1.440 36.50 8.500 215.9 12 0.880 22.30 10.62 269.7 20.9
8 8.625 219.1 15.00 381.0 1.620 41.10 10.62 269.7 12 1.000 25.40 13.00 330.2 34.3
10 10.75 273.0 17.50 444.5 1.880 47.70 12.75 323.9 16 1.120 28.40 15.25 387.3 53.3
12 12.75 323.8 20.50 520.7 2.000 50.80 15.00 381.0 16 1.250 31.70 17.75 450.8 78.8
14 14.00 355.6 23.00 584.2 2.120 53.80 16.25 412.8 20 1.250 31.70 20.25 514.3 105
16 16.00 406.4 25.50 647.7 2.250 57.15 18.50 469.9 20 1.380 35.00 22.50 571.5 137
18 18.00 457.2 28.00 711.2 2.380 60.45 21.00 533.4 24 1.380 35.00 24.75 628.6 175
20 20.00 508.0 30.50 774.7 2.500 63.50 23.00 584.2 24 1.380 35.00 27.00 685.8 221
24 24.00 609.6 36.00 914.4 2.750 69.85 27.25 692.2 24 1.620 41.10 32.00 812.8 339

Notes:

  • Weights are based on manufacturer’s data and are approximate.
  • Flat face flanges may be provided at full thickness,C,or with raised face removed (the latter is nonstandard).

Specifications of ANSI/ASME B16.5 flange:

Types of ANSI/ASME B16.5 forged flanges:

ANSI ASME B16.5 weld neck flange drawing

ANSI ASME B16.5 weld neck flange drawing

Weld neck flange(WN flange) is circumferentially welded into the system at its neck which means that the integrity of the butt
welded area can be easily examined by radiography.The bores of both pipe and flange match,which reduces turbulence and erosion inside the pipeline.The weld neck is therefore favoured in critical applications.

ANSI ASME B16.5 blind flange drawing

ANSI ASME B16.5 blind flange drawing

Blind flange is used to blank off pipelines,valves and pumps,it can also be used as an inspection cover.It is sometimes referred to as a blank flange.

ANSI ASME B16.5 slip on flange drawing

ANSI ASME B16.5 slip on flange drawing

Slip on flange(SO flange) is slipped over the pipe and then fillet welded.Slip-on flanges are easy to use in fabricated applications.

ANSI ASME B16.5 lap joint flange drawing

ANSI ASME B16.5 lap joint flange drawing

Lap joint flange(LJ flange) is always used with either a stub end
or taft which is butt welded to the pipe with the flange loose behind it.
This means the stub end or taft always makes the face.The lap joint is favoured in low pressure applications because it is easily assembled and aligned.To reduce cost these flanges can be supplied without a hub and/or in treated,coated carbon steel.

ANSI ASME B16.5 socket weld flange drawing

ANSI ASME B16.5 socket weld flange drawing

Socket weld flange(SW flange) is counter bored to accept the pipe before being fillet welded.The bore of the pipe and flange are both the same therefore giving good flow characteristics.

ANSI ASME B16.5 threaded flange drawing

ANSI ASME B16.5 threaded flange drawing

Threaded flange is referred to as either threaded or screwed.It is used to connect other threaded components in low pressure, non-critical applications.No welding is required.

ANSI ASME B16.5 ring type joint flange drawing

ANSI ASME B16.5 ring type joint flange drawing

Ring type joint is a method of ensuring leak proof flange connection at high pressures.A metal ring is compressed into a hexagonal groove on the face of the flange to make the seal.This jointing method can be employed on weld neck flanges,slip on flange and blind flanges.

Materials of ANSI/ASME B16.5 class 150 blind flange:

Carbon steel ANSI/ASME B16.5 blind flange:

ASTM A105,A350 LF2,SS400,P235GH,P250GH,C22.8,Q235,20#,16Mn,etc.

Stainless steel ANSI/ASME B16.5 blind flange:

ASTM A182 F304,F304L,F316,F316L,F321,F347,F310,F44,F51,etc.

Alloy steel ANSI/ASME B16.5 blind flange:

ASTM A694 F42,F46,F52,F56,F60,F65,F70,A182 F5,F9,F91,F12,F11,F22,etc.

Related:

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