Special Flange

We supply a wide range of special Flanges to the most demanding industries. Our products includes Orifice Flange, Lap joint Flange, Reducing Flange, Swivel Flange, Anchor Flange, etc. all in standard and specialty applications.

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Orifice Flange

Lap Joint Flange

Reducing Flange

Swivel Flange

Anchor Flanges

Highlights of the Flanges

Specification

• ASME B16.5, ASME B16.47 (Serie A and Serie B),API 6A, ASME B16.36, ASME B16.48 and MSS SP44 are the key specifications covering the dimensions and the manufacturing tolerances of Flanges. ASME B16.25 covers the preparation of butt weld connections between pipes and Weld Neck Flange. MSS SP25 covers the marking system.

• ASTM A961 is standard specification for common requirements for steel flanges and parts for piping applications.

• The weld neck and socket weld flanges has the same SCH as the mating pipe.

Hydrostatic Test

• Parts manufactured under ASTM A961 shall be capable of passing hydrostatic test compatible with the rating of the finished part. Such test shall be conducted by the supplier only when the hydrostatic test supplementary requirement in the product specification is invoked by the purchaser.

Disadvantage

• Flanged pipe systems need much more space (just think of a pipe rack).

• Each flange connection can leak (some people claim that a flange connection is never 100 percent leak proof).

• Insulation of flanged pipe systems is more expensive (special flange caps).

Cost

• Material costs are low, but labor costs are moderate to high due to the need for specialized welders and ﬁtters.

Size

• FROM 0.5'' TO 60'‘

• conformity with the customers drawing

Other Properties

• Different types of flange faces are used as the contact surfaces to seat the sealing gasket material. ASME B16.5 and B16.47 define various types of flange facings, including the Flat face, raised face and the large male and female facings which have identical dimensions to provide a relatively large contact area.

Materials

ASTM A105/ A105 M-98, ASTM A181 M-95 b Class 60, ASTM A181 M-95 b Class 70,

ASTM A694/ A694M (F42, F46, F48, F50, F52, F56, F60, F65, F70)

ASTM A515/ A515M (Gr.55, 60, 65, 70)

ASTM A350/ A350M-99(LF1, LF2, LF3, LF5, LF6, LF9, LF787),

ASTM A707/ A707M(L1, L2, L3, L4, L5, L5, L6, L7, L8)

ASTM A516/ A516M (Gr. 60, 65, 70)

ASTM A182/ A182 M-98ª(F 304, F 304H, F 304L, F 304N, F304 LN, F 309H, F310, F 310H, F 310 MoLN, F 316, F 316H, F 316L, F 316N, F 316LN, F 317, F 317L, F 347, F 347 H, F 348, F 348 H, F 321, F321 H)

ASTM A240/ A240M( 304,310, 316)

ASTM A182/ A182 M-98a( F 1, F 2, F 5, F 5a, F 9, F 91, F 92, F911, F11 Class 1, F11 Class 2, F11 Class 2, F12 Class 1, F12 Class 2,F 21 F3V, F21 3VCb, F22 Class 1, F22 Class 3, F 23, F 24, F R)

ASTM A387/ A387M(Gr.2, 12, 11, 22, 22L, 21, 21L, 5, 9, 91)

ASTM A182 (F 50, F 51, F 52, F 53M F 54, F 55, F 57, F 59, F 60, F 61, F 904L)

SB 564(UNS N02200, UNS N04400, UNS N06022, UNS N06025, UNS N06035, UNS N06045, UNS N06058, UNS N06059, UNS N06110)

Standard

ASME B16.5, ASME B16.47 (Serie A and Serie B), API 6A ASME B16.36, ASME B16.48 and MSS SP44 are the key specifications covering the dimensions and the manufacturing tolerances of Flanges. ASME B16.25 covers the preparation of butt weld connections between pipes and Weld Neck Flange. MSS SP25 covers the marking system.

ASME B16.5

ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, testing, and methods of designating openings for pipe flanges and flanged fittings. Included are: flanges with rating class designations 150, 300, 400, 600, 900, and 1500 in sizes NPS 1/2 through NPS 24 and flanges with rating class designation 2500 in sizes NPS 1/2 through NPS 12.

ASME B16.47 (Serie A and Serie B), MSS-SP44

Large Diameter Steel Flanges, NPS 26 through NPS 60 Metric/Inch Standard, Weld Neck, Slip-On, Blind. Class 150 to Class 900

API 6A

Today API Spec 6A and MSS SP-44 specify all flanges commonly used in surface drilling and production. These flanges have a long history and many flanges used in the past have been discontinued, or obsoleted and replaced by more modern configurations. Originally, all flanges related to pipe and became standard as weld neck, threaded and blind configurations. As equipment with integral flanges came to the oilfield, standardization became necessary for functional interchangeability.

ASME B16.36

This Standard covers flanges (similar to those covered in ASME B16.5) that have orifice pressure differential connections. Coverage is limited to the following: (a) welding neck flanges Classes 300, 400, 600, 900, 1500, and 2500 (b) slip-on and threaded Class 300.

ASME B16.48

This Standard covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for operational line blanks in sizes NPS 1/2 through NPS 24 for installation between ASME B16.5 flanges in the 150, 300, 600, 900, 1500, and 2500 pressure classes.