Special Flange

Petrosadid: 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.

For more information please contact our
Customer Support Center:
Customer Support Center
Orifice Flange

Orifice flanges may be provided in one of three types of flanges: Welding Neck, Slip-On and Threaded. Each flange is provided with a pair of pressure taps for measurement of pressure drop in the flow through the orifice plate

image image
Lap Joint Flange

Used in conjunction with a "Lap joint Stub End," these flanges are nearly identical to a slip-on flange with the exception of a radius at the intersection of the flange face and the bore to accommodate the flanged portion of the stubbed.

image image

1. Lap Joint flange 2. Stub End 3. Butt weld 4. Pipe or Fitting

Reducing Flange

A reducing flange consists of a flange with one specified diameter having a bore of a different and smaller, diameter. Except for the bore and hub dimensions, the flange will have dimensions of the larger pipe size.

Reducing flanges are designed for when there is a change in the pipe size. The predominate flange (dimensions) matching the larger pipe size (NPT) but having a smaller bore matching the smaller pipe size (NPT). These flanges normally come in blind, slip-on, threaded and weld neck flanges. They are available in all pressure classes and provide a good alternative to connecting two different sizes of pipe. This type of flange should not be used if an abrupt transition would create unwanted turbulence, such as at a pump.

image image
Swivel Flange

Swivel Flange is made of two-piece construction consisting of a heavy forged welding hub with a rotating forged ring that serves as a mating flange to a Weld Neck or other flange. It has a Retaining Ring to secure the Welding Hub to hold the Rotating Ring in position (from the left to the right: retaining ring, ring and hub).

Anchor Flanges

Anchor flanges are used to restrain pipeline movement caused by thermal expansion changes or external forces. The most common method of securing an anchor flange is to embed it into a concrete thrust block, thereby spreading the pipeline forces throughout a large foundation.

image image

Highlights of the Flanges


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)


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.

How can we help you?

If you have questions, comments or feedback, please feel free to contact us. We are ready to help!