Special Flanges
Special Purpose & DIN Standard Flanges for Critical Piping Applications — Orifice, Long Weld Neck, Spectacle Blind, Expander, AWWA, DIN & EN1092-1
Product Overview
Special Flanges
Special Flanges are engineered for specific piping applications that require unique design features beyond standard flanges. These include flow measurement, pipe size transitions, isolation, and compliance with international DIN & EN standards. We supply a complete range of special purpose and DIN standard flanges for critical industrial piping systems.
Special Types
Orifice, Long Weld Neck, Spectacle Blind Fig.8, Weldo Flange, Nippo Flange, Expander, Reducing, AWWA
DIN / EN Types
DIN All Type & EN1092-1 Flanges
Dim. Standard
ASME B16.5 / B16.47 / DIN / EN1092-1
Grade
ASTM/ASME A105, A350 LF2 & A182 Gr. F5, F11, F22, F51, F52, F91, F92, F304, F304H, F304L, F310, F316, F316L, F317, F317L, F321 & F347
Class
150# & 300# & 600# & 900# & 1500# & 2500#
Special Types
Special Flange Range
Orifice Flange
Used in pairs with an orifice plate between them for flow measurement. Supplied with pressure tappings on the flange face.
Long Weld Neck Flange
Extended neck weld flange used as a nozzle on pressure vessels, columns and heat exchangers for high-pressure service.
Spectacle Blind Flange Fig.8
Figure-8 shaped fitting combining a blind and a spacer ring. Rotated to isolate or allow flow without removing from the pipeline.
Weldo Flange
Combined weldolet and flange in a single forged piece. Eliminates the need for a separate weldolet and flange assembly on branch connections.
Nippo Flange
Combined nipple and flange in one forged piece. Replaces a separate nipple and flange for compact branch flange connections.
Expander Flange
Replaces a weld neck flange and a concentric reducer. Used to increase pipe bore size at a flange connection point.
Reducing Flange
Connects two pipes of different sizes at a flanged joint, eliminating the need for a separate reducer fitting.
AWWA Flange
American Water Works Association flanges for large diameter water transmission and distribution piping systems.
DIN Standard
DIN Standard Flanges
DIN All Type Flanges
Complete range of DIN standard flanges including DIN 2527, 2566, 2573, 2576, 2631, 2632, 2633, 2634, 2635, 2636, 2637, 2638 in all pressure ratings (PN6 to PN400) and all materials.
EN1092-1 Flanges
European standard EN1092-1 flanges for steel piping systems. Covers all flange types — Weld Neck, Slip On, Blind, Threaded and Lap Joint in PN6 to PN400 pressure ratings.
Technical Data
Dimensional Standards
| Parameter | Standard Specification |
|---|---|
| ASME Standard | ASME B16.5 / B16.47 |
| DIN / EN Standard | DIN 2527 to 2638 / EN1092-1 |
| ASME Class | 150# & 300# & 600# & 900# & 1500# & 2500# |
| DIN / EN Pressure Rating | PN6, PN10, PN16, PN25, PN40, PN64, PN100, PN160, PN250, PN400 |
| Facing | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Grade | ASTM/ASME A105, A350 LF2 & A182 Gr. F5, F11, F22, F51, F52, F91, F92, F304, F304H, F304L, F310, F316, F316L, F317, F317L, F321 & F347 |
Material Range
Available Grades
ASTM / ASME A182 F
ASTM / ASME A105
ASTM / ASME A350 (Low Temp)
ASTM / ASME A182 F
End Use
Key Applications
Oil & Gas
Orifice flanges for flow metering, spectacle blinds for line isolation in refineries.
Power Plants
Long weld neck flanges as vessel nozzles in boilers and heat exchangers.
Water Works
AWWA flanges for large diameter water transmission and municipal water systems.
Export / European
DIN & EN1092-1 flanges for European projects and international export orders.
Quality Assurance
Testing & Inspection
ISO 9001:2015 Certified
PED 2014/68/EU Approved
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