Short Description

Model No.: F316-Spectacle-Blind-Flange-RF-10"-300#

China Figure-8 Blank Flange Manufacturer www.steeljrv.com offers ASME B16.48 A182 F316 Spectacle Blind Flange RF, 10″, 300#.

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Key Specifications / Features

Type: Spectacle Blind Flange
Size: DN250 (10″)
Class Rate: 300#
Material: 316 (S31600/1.4401)
Standard: ASME B16.48

China Figure-8 Blank Flange Manufacturer www.steeljrv.com offers ASME B16.48 A182 F316 Spectacle Blind Flange RF, 10″, 300#.


20200824084826 20916 - ASME B16.48 A182 F316 Spectacle Blind Flange RF 10" 300#

Chemical Composition and Mechanical Property For 316

Steel Grade

Chemical Composition

Mechanical Performance

C(Max)

Si(Max)

Mn(Max)

P(Max)

S(Max)

Ni

Cr

Mo

N

Tensile Strength
(Min)

Yield Strength
(Min)

Mpa

Mpa

316

0.08

0.75

2.00

0.045

0.03

10.0–14.0

16.0–18.0

2.00–3.00

0.1

515

205

What is a spectacle blind flange?

If the spade is put in between the flanges, it stops the fluid’s passage; Spectacle blind Flange ,also known as figure 8 Flange which is combination of the two that can be rotated to function as Single Bind or a Ring Spacer. This kind of flange is generally a piece of metal than is cut to fit between two pipe flanges and usually sandwiched between two gaskets a spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. The Sharp is similar to a pair of glasses or spectacles – hence the name spectacle blind flange. One end of the blind will have an opening to allow flow through the pipe during operation and the other end is solid to block flow during maintenance. They are generally installed as a permanent device to separate process piping system.
The whole idea of a spectacle blind Flange is so that one can be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance. The flow can be diverted to other items of equipment but not just by passed around the blank as this would compromise the safety function of the spectacle blind. The flow has to valve off and pressure relieved prior to loosening flange bolts and swinging the blind.
Spectacle Blind Flange may have a different type of joint face (RF Raised Face, FF Flat Face, RTJ Ring Joint), depending the type of flange.
Spectacle Blind Flange  is usually used on the oil line with two different functions:

  • If the spacer is put in between the flanges, the passage of the fluid is allowed.

The Spectacle Blind is inserted between two flanges: in order to guarantee a perfect  waterlight two gaskets are normally mounted , one on each side of spectacle blind.

20200222024511 80980 - ASME B16.48 A182 F316 Spectacle Blind Flange RF 10" 300#

Technical drawing for the figure-8 blank (spectacle blind flange) in accordance with ASME B16.48, with raised face. The RF dimensions shall be furnished in accordance with ASME B16.5. The height of the raised face shall be in addition to the thickness T. For Class 150 & 300, the height of RF shall be 2 mm; for Class 600, 900, 1500 & 2500, the height of RF shall be 7 mm.

Dimensions & Weights of ASME B16.48 Spectacle Blind Flange

NPS

O

A

T

W

B

1/2

45

60

3.0

38

16

3/4

54

70

3.0

38

21

1

64

80

3.0

38

27

1-1/4

73

90

6.4

38

42

1-1/2

83

100

6.4

38

48

2

102

120

6.4

51

61

2-1/2

107

140

6.4

51

73

3

133

150

6.4

64

89

3-1/2

159

175

9.7

64

102

4

172

190

9.7

64

114

5

194

215

9.7

76

141

6

219

240

12.7

76

168

8

276

300

12.7

76

219

10

337

360

15.7

102

273

12

406

430

19.1

102

324

14

448

475

19.1

108

356

16

511

540

22.4

108

406

18

546

580

25.4

114

457

20

603

635

28.4

121

508

24

714

750

31.8

140

610

* Basic dimensions for ASME B16.48 Class 150 figure-8 blanks (spectacle blind flanges) with FF or RF.

NPS

O

A

T

W

B

1/2

51

65

6.4

38

16

3/4

64

80

6.4

38

21

1

70

90

6.4

38

27

1-1/4

79

100

6.4

38

42

1-1/2

92

115

6.4

38

48

2

108

125

9.7

51

61

2-1/2

127

150

9.7

51

73

3

146

170

9.7

64

89

3-1/2

162

185

12.7

64

102

4

178

200

12.7

64

114

5

213

235

15.7

76

141

6

248

270

15.7

76

168

8

305

330

22.4

76

219

10

359

385

25.4

102

273

12

419

450

28.4

102

324

14

483

515

31.8

108

356

16

536

570

38.1

108

406

18

594

630

41.1

114

457

20

651

685

44.5

121

508

24

772

810

50.8

140

610

* Basic dimensions for ASME B16.48 Class 300 figure-8 blanks (spectacle blind flanges) with FF or RF.

NPS

O

A

T

W

B

1/2

51

65

6.4

38

16

3/4

64

80

6.4

38

21

1

70

90

6.4

57

27

1-1/4

79

100

9.7

57

37

1-1/2

92

115

9.7

67

43

2

108

125

9.7

57

55

2-1/2

127

150

12.7

67

67

3

146

170

12.7

67

83

3-1/2

159

185

15.7

76

96

4

191

215

15.7

76

108

5

238

265

19.1

86

135

6

264

290

22.4

86

162

8

318

350

28.4

95

212

10

397

430

35.1

105

265

12

454

490

41.1

105

315

14

489

525

44.5

114

346

16

562

605

50.8

124

397

18

610

655

53.8

133

448

20

679

725

63.5

133

497

24

787

840

73.2

152

597

* Basic dimensions for ASME B16.48 Class 600 figure-8 blanks (spectacle blind flanges) with FF or RF.

NPS

O

A

T

W

B

1/2

60

80

6.4

38

16

3/4

67

90

6.4

41

21

1

76

100

6.4

57

27

1-1/4

86

110

9.7

57

37

1-1/2

95

125

9.7

67

43

2

140

165

12.7

57

55

2-1/2

162

190

12.7

67

67

3

165

190

15.7

67

83

4

203

235

19.1

76

108

5

244

280

22.4

86

135

6

286

320

25.4

86

162

8

356

395

35.1

95

212

10

432

470

41.1

105

265

12

495

535

47.8

105

315

14

518

560

53.8

114

346

16

572

615

60.5

124

397

18

635

685

66.5

133

448

20

696

750

73.2

133

497

24

835

900

88.9

152

597

* Basic dimensions for ASME B16.48 Class 900 figure-8 blanks (spectacle blind flanges) with FF or RF.

NPS

O

A

T

W

B

1/2

61

80

6.4

38

16

3/4

67

90

9.7

41

21

1

76

100

9.7

64

27

1-1/4

86

110

9.7

64

35

1-1/2

95

125

12.7

70

41

2

140

165

12.7

70

53

2-1/2

162

190

15.7

76

63

3

172

205

19.1

76

78

4

206

240

22.4

89

102

5

251

290

28.4

89

128

6

279

320

35.1

89

154

8

349

395

41.1

102

203

10

432

480

50.8

114

255

12

518

570

60.5

114

303

14

575

635

66.5

127

333

16

638

705

76.2

133

381

18

702

775

85.9

146

429

20

752

830

95.3

152

478

24

899

990

111.3

178

575

* Basic dimensions for ASME B16.48 Class 1500 figure-8 blanks (spectacle blind flanges) with FF or RF.

NPS

O

A

T

W

B

1/2

67

90

9.7

38

16

3/4

73

95

9.7

41

21

1

83

110

9.7

64

27

1-1/4

102

130

12.7

64

35

1-1/2

114

145

15.7

70

41

2

143

170

15.7

70

53

2-1/2

165

195

19.1

76

63

3

194

230

22.4

76

78

4

232

275

28.4

89

102

5

276

325

35.1

89

128

6

314

370

41.1

89

154

8

384

440

53.8

102

198

10

473

540

66.5

114

248

12

546

620

79.2

114

289

* Basic dimensions for ASME B16.48 Class 2500 figure-8 blanks (spectacle blind flanges) with FF or RF.

NPS

150#

300#

600#

1/2

0.12

0.25

0.38

3/4

0.17

0.38

0.57

1

0.23

0.46

0.73

1-1/4

0.49

0.56

1.24

1-1/2

0.63

0.76

1.65

2

0.96

1.46

2.33

2-1/2

1.07

1.98

3.61

3

1.59

2.61

4.87

3-1/2

3.00

3.93

6.46

4

3.52

4.73

9.00

5

4.34

7.93

15.34

6

6.66

10.56

21.06

8

10.19

21.16

35.75

10

17.59

31.63

64.41

12

30.31

47.11

94.88

14

36.80

71.30

116.37

16

55.11

102.25

171.78

18

68.18

133.67

210.36

20

90.98

170.85

299.91

24

139.19

269.41

447.64

*  Weights for spectacle blinds in sizes NPS 1/2″ through 24″ of Class 150, 300 & 600.

NPS

900#

1500#

2500#

1/2

0.46

0.46

0.72

3/4

0.61

0.79

0.89

1

0.80

1.05

1.19

1-1/4

1.37

1.40

2.14

1-1/2

1.73

2.08

3.17

2

3.98

4.04

4.90

2-1/2

5.21

6.21

7.50

3

6.68

8.47

11.81

4

11.45

13.58

20.45

5

18.15

23.62

34.01

6

27.04

34.45

49.98

8

53.48

60.13

94.12

10

88.31

108.77

171.27

12

130.89

182.62

268.26

14

156.56

245.28

16

208.72

339.62

18

278.80

457.52

20

361.74

569.25

24

619.04

936.93

*  Weights for spectacle blinds in sizes NPS 1/2″ through 24″ of Class 900, 1500 & 2500.

General notes:

  • Dimensions are in millimeters unless otherwise indicated.
  • D = Hole size (where required) should be the same as the flange bolt hole. In practice, these dimensions have been rounded round off upwards.
  • Wt = Thickness of the web (or tie bar) should be 6 mm minimum, or equal to Thickness (t) if less than 6 mm.
  • Spectacle Blinds should be made from a plate or forging specification, approved for use by ASME B31.3, of essentially the same chemical composition as the mating flanges and piping involved.
  • Spectacle Blinds ASME B16.48 may be used for installation between ASME B16.5 flanges
  • Depending on a customer specification, some dimensions can be different from what on this page is defined.

Raised Face Joint Blanks

flg specblind rf - ASME B16.48 A182 F316 Spectacle Blind Flange RF 10" 300#
  • ASME B16.48 says: The gasket seating surface finish and dimensions for raised face line blanks shall be in accordance with ASME B16.5. A raised face may be specified at the option of the purchaser.
  • A Raised Face would add machining time and complexity so the price would be higher. Call this the Bugatti or Rolls Royce of the line blind world.
  • Personally, I have seen that version once or twice somewhere. The version without Raised Face is the default and is used everywhere.

Pressure Ratings of ASME B16.48 Spectacle Blind Flange


Flanges pressure rating in psig for Spectacle Blind Flange ASME
Temperature (F°) 150# 300# 400# 600# 900# 1500# 2500#
-20 to 100 285 740 985 1480 2220 3705 6170
200 260 680 905 1360 2035 3395 5655
300 230 655 870 1310 1965 3270 5450
400 200 635 845 1265 1900 3170 5280
500 170 605 805 1205 1810 3015 5025
600 140 570 755 1135 1705 2840 4730
650 125 550 730 1100 1650 2745 4575
700 110 530 710 1060 1590 2655 4425
750 95 505 675 1015 1520 2535 4230
800 80 410 550 825 1235 2055 3430
850 65 320 425 640 955 1595 2655
900 50 230 305 460 690 1150 1915
950 35 135 185 275 410 685 1145
1000 20 85 115 170 255 430 715


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asme b16 48 a182 f316 spectacle blind flange rf 10 300 - ASME B16.48 A182 F316 Spectacle Blind Flange RF 10" 300#
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ASME B16.48 A182 F316 Spectacle Blind Flange RF 10" 300#
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