• Author / Uploaded
• Juan Roberto López Betanzos

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Oil States HydroTech

Subsea Pipeline Technology since 1966

MisAligning Flange

TM

For connections with up to 10° misalignment from centerline

API 6H-0001

The MisAligning Flange (MAF) is a metal-to-metal sealed balland-socket connector for bolting together two misaligned pipelines. The MAF reduces installation time by allowing divers to make the connection without lifting and aligning the pipe ends. The MAF incorporates a metal-to-metal seal that can be verified via an annulus test. The metal sealing criteria is the same as that specified by ASME for ring-joint flanges. In addition, the prescribed stud and nut tightening for the MAF at make-up exceeds the thrust load resulting from the design or test pressure. Sealing integrity is maintained at any angle of misalignment, with the seal being insensitive to externally applied bending loads at all operating pressures. The latter is not true for flanges with R or RX type gaskets or raised-face flanges with flat gaskets. A secondary o-ring seal enables testing of the primary metal seal by applying hydraulic pressure to the annulus between the o-ring and the metal seal. The assembled MAF, with its studs and nuts only hand-tight, may be used as a single swivel for spoolpiece tie-ins, with the oring providing a bi-directional seal up to the rated pressure of the MAF. Once the MAF has performed its alignment function and the studs and nuts are tightened, it is then statically metal-sealed, and the Ball resists rotating when external moments are applied. The metal seal integrity can be verified via Butt-weld by butt-weld (4-in. – 24-in. shown) the annulus test feature described above.

Butt-weld by flange (4-in. and 24-in. shown)

MisAligning Flanges are available from stock in 4 inch through 24 inch, ANSI 900 rating. Through 16-inch, MAFs are stocked with schedule 80 bores; 20-inch and 24-inch have schedule 60 bores. The material for MAFs in inventory

is ASTM A694, grade F46 for sizes up through 10-inch and grade F52 for sizes 12-inch through 24-inch. Larger sizes and other pressure ratings can be manufactured. Design Specifications MisAligning Flanges meet the requirements of API 6H and are designed in accordance with ASME Pressure Vessel Code, Section VIII, Division 2, unless otherwise specified. Material and configuration of the butt-weld ends are in accordance with ASME B16.5 or MSS SP-44 to match the pipeline. MAF studs and nuts are designed to be torqued unless stud tensioning is specified. Ordering Information Please provide the following information on any purchase order or request for quotation: • Nominal pipe size • Pipe wall thickness or bore • Pipe grade • Design rating • Butt-weld by butt-weld or butt-weld by flange configuration • Flange type and specification, if applicable • Stud tensionable fasteners, if desired

© 2002 Oil States Industries Incorporated

w w w. o i l s t a t e s hy d r o t e c h . c o m

MAIN OFFICES 13111 Northwest Freeway Suite 200 Houston, Texas 77040 Ph 713 510 2200 Fx 713 688 9166 email [email protected]

SALES OFFICE Blackness Road Altens Industrial Estate Aberdeen AB12 3LH Scotland Ph (44) 1224 896190 Fx (44) 1224 896199

SALES OFFICE No. 9 Pandan Crescent Singapore 128465 Ph (65) 6773 7555 Fx (65) 6773 7667

SALES OFFICE 36, Bd des Oceans 13275 Marseille Cedex 9 France Ph (33) 491 29 18 33 Fx (33) 491 29 18 43

Misaligning Flange, Page 2 Test port Test seal

Metal seal

Weld-neck RTJ flange

Retainer flange Housing Ball

Extension nipple

Butt-weld by flange configuration D I

A

B

H

C

E, F, G

Butt-weld by butt-weld configuration

Nominal pipe size, inches

Pressure rating

A Weld-neck OD, inches

B Bore size, inches

C Outside diameter, inches

Machining a 42-inch MisAligning Flange ball D Overall length, inches

E Number of studs

F Stud size, inches

G Stud length, inches

H Bolt circle, inches

I Ball swallow, inches

Approximate weight, lb

2

5000 API 10000 API

2.38 2.94

1.69 2.06

8.00 8.50

8.12 9.00

6 8

0.875 0.875

7.00 7.75

6.312 6.750

1.82 1.94

68 87

3

5000 10000 900 1500 2500

API API ANSI ANSI ANSI

3.50 4.34 3.50 3.50 3.65

2.62 3.06 2.90 2.90 2.90

9.88 10.75 9.12 10.12 11.00

9.62 11.73 7.94 9.12 10.29

6 8 8 6 6

1.125 1.125 0.875 1.125 1.250

9.00 10.25 7.00 8.50 9.50

7.688 8.563 7.438 7.938 8.656

2.12 2.27 1.94 2.15 2.27

130 185 90 125 170

4

5000 10000 900 1500 2500

API API ANSI ANSI ANSI

4.50 5.75 4.50 4.62 4.62

3.44 4.06 3.83 3.83 3.62

11.00 13.38 11.12 12.00 12.75

10.95 14.62 9.58 10.65 12.44

8 10 6 6 6

1.125 1.375 1.125 1.250 1.500

9.75 13.00 8.75 9.75 11.75

8.812 10.750 8.938 9.625 10.000

2.38 3.08 2.30 2.47 2.75

185 370 150 210 295

6

900 ANSI 1500 ANSI 2500 ANSI

6.62 6.62 6.62

5.76 5.76 5.19

13.50 14.50 17.00

11.44 12.00 16.62

8 6 6

1.125 1.375 2.000

10.00 11.00 16.00

11.313 11.875 13.375

2.81 2.94 3.75

245 310 690

8

900 ANSI 1500 ANSI 2500 ANSI

8.62 8.62 9.12

7.62 7.62 7.44

16.88 18.00 19.75

14.00 15.38 19.12

8 8 8

1.375 1.625 2.000

12.25 14.00 17.75

14.250 15.000 16.125

3.56 3.88 4.41

465 670 1000

10

900 ANSI 1500 ANSI

10.91 10.88

9.56 9.06

19.62 21.38

17.25 18.31

12 8

1.375 1.875

14.50 16.75

17.062 17.875

4.37 4.81

800 1050

12

900 ANSI 1500 ANSI

12.75 12.88

11.75 11.38

22.00 24.38

18.53 21.38

14 10

1.375 2.000

15.50 19.00

19.375 20.750

4.72 5.44

955 1550

14

900 ANSI

14.00

12.81

24.12

21.62

16

1.500

18.25

21.375

5.38

1410

16

900 ANSI

16.19

14.75

27.12

23.94

16

1.625

20.00

24.063

6.06

1900

18

600 ANSI 900 ANSI

18.00 18.25

17.00 16.50

29.25 31.00

25.12 29.06

16 18

1.625 1.875

21.00 24.25

26.250 27.500

6.25 7.19

2140 3045

20

600 ANSI 900 ANSI

20.16 20.19

19.00 18.75

31.75 33.00

27.31 28.12

18 14

1.625 2.000

22.25 23.75

28.750 29.312

6.62 6.88

2630 3110

24

600 ANSI 900 ANSI

24.00 24.31

22.88 22.50

37.25 39.62

31.27 33.12

18 12

1.875 2.500

26.50 28.75

33.750 35.062

7.78 8.50

4190 6055

© 2002 Oil States Industries Incorporated