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© 2002 Oil States Industries Incorporated

API 6H-0001

Oil States HydroTech

since 1966Subsea Pipeline TechnologyMisAligning FlangeTM

For connections with up to 10°misalignment from centerline

The MisAligning Flange (MAF) is a metal-to-metal sealed ball-and-socket connector for bolting together two misalignedpipelines. The MAF reduces installation time by allowing diversto make the connection without lifting and aligning the pipe ends.

The MAF incorporates a metal-to-metal seal that can be verifiedvia an annulus test. The metal sealing criteria is the same asthat specified by ASME for ring-joint flanges. In addition, theprescribed stud and nut tightening for the MAF at make-upexceeds the thrust load resulting from the design or test pres-sure. Sealing integrity is maintained at any angle of misalign-ment, with the seal being insensitive to externally applied bend-ing loads at all operating pressures. The latter is not true forflanges with R or RX type gaskets or raised-face flanges with flatgaskets. A secondary o-ring seal enables testing of the primarymetal seal by applying hydraulic pressure to the annulusbetween 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 o-ring providing a bi-directional seal up to the rated pressure of

the MAF. Once theMAF has performedits alignment functionand the studs and nutsare tightened, it is thenstatically metal-sealed,and the Ball resistsrotating when externalmoments are applied.The metal seal integri-ty can be verified viathe annulus test fea-ture described above.

MisAligning Flangesare available fromstock in 4 inchthrough 24 inch, ANSI900 rating. Through16-inch, MAFs arestocked with schedule80 bores; 20-inch and24-inch have schedule60 bores. The materialfor MAFs in inventory

is ASTM A694, grade F46 for sizes up through 10-inch andgrade F52 for sizes 12-inch through 24-inch. Larger sizes andother pressure ratings can be manufactured.

Design Specifications

MisAligning Flanges meet the requirements of API 6H and aredesigned in accordance with ASME Pressure Vessel Code, SectionVIII, Division 2, unless otherwise specified. Material and config-uration of the butt-weld ends are in accordance with ASMEB16.5 or MSS SP-44 to match the pipeline.

MAF studs and nuts are designed to be torqued unless stud ten-sioning is specified.

Ordering Information

Please provide the following information on any purchase orderor 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

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

Butt-weld by butt-weld (4-in. – 24-in. shown)

© 2002 Oil States Industries Incorporated

Misaligning Flange, Page 2

A B C D E F G H INominal Pressure Weld-neck Bore Outside Overall Number Stud size, Stud length, Bolt circle, Ball Approximatepipe size, rating OD, size, diameter, length, of studs inches inches inches swallow, weight,

inches inches inches inches inches inches lb

2 5000 API 2.38 1.69 8.00 8.12 6 0.875 7.00 6.312 1.82 6810000 API 2.94 2.06 8.50 9.00 8 0.875 7.75 6.750 1.94 87

3 5000 API 3.50 2.62 9.88 9.62 6 1.125 9.00 7.688 2.12 13010000 API 4.34 3.06 10.75 11.73 8 1.125 10.25 8.563 2.27 185

900 ANSI 3.50 2.90 9.12 7.94 8 0.875 7.00 7.438 1.94 901500 ANSI 3.50 2.90 10.12 9.12 6 1.125 8.50 7.938 2.15 1252500 ANSI 3.65 2.90 11.00 10.29 6 1.250 9.50 8.656 2.27 170

4 5000 API 4.50 3.44 11.00 10.95 8 1.125 9.75 8.812 2.38 18510000 API 5.75 4.06 13.38 14.62 10 1.375 13.00 10.750 3.08 370

900 ANSI 4.50 3.83 11.12 9.58 6 1.125 8.75 8.938 2.30 1501500 ANSI 4.62 3.83 12.00 10.65 6 1.250 9.75 9.625 2.47 2102500 ANSI 4.62 3.62 12.75 12.44 6 1.500 11.75 10.000 2.75 295

6 900 ANSI 6.62 5.76 13.50 11.44 8 1.125 10.00 11.313 2.81 2451500 ANSI 6.62 5.76 14.50 12.00 6 1.375 11.00 11.875 2.94 3102500 ANSI 6.62 5.19 17.00 16.62 6 2.000 16.00 13.375 3.75 690

8 900 ANSI 8.62 7.62 16.88 14.00 8 1.375 12.25 14.250 3.56 4651500 ANSI 8.62 7.62 18.00 15.38 8 1.625 14.00 15.000 3.88 6702500 ANSI 9.12 7.44 19.75 19.12 8 2.000 17.75 16.125 4.41 1000

10 900 ANSI 10.91 9.56 19.62 17.25 12 1.375 14.50 17.062 4.37 8001500 ANSI 10.88 9.06 21.38 18.31 8 1.875 16.75 17.875 4.81 1050

12 900 ANSI 12.75 11.75 22.00 18.53 14 1.375 15.50 19.375 4.72 9551500 ANSI 12.88 11.38 24.38 21.38 10 2.000 19.00 20.750 5.44 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 18.00 17.00 29.25 25.12 16 1.625 21.00 26.250 6.25 2140900 ANSI 18.25 16.50 31.00 29.06 18 1.875 24.25 27.500 7.19 3045

20 600 ANSI 20.16 19.00 31.75 27.31 18 1.625 22.25 28.750 6.62 2630900 ANSI 20.19 18.75 33.00 28.12 14 2.000 23.75 29.312 6.88 3110

24 600 ANSI 24.00 22.88 37.25 31.27 18 1.875 26.50 33.750 7.78 4190900 ANSI 24.31 22.50 39.62 33.12 12 2.500 28.75 35.062 8.50 6055

A CHB

E, F, G

D

I

Test port

Metal seal

Housing

Test seal

Retainer flange

Ball

Weld-neck RTJ flange

Extension nipple

Butt-weld by flange configuration

Machining a 42-inch MisAligning Flange ballButt-weld by butt-weld configuration