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General Information about Flanges


Quality Standard for Flanges

High quality Flanges all made and controlled to the relevant standards such as: ASME, ASTM, BS and DIN/WERKSTOFFE.

Sizes for Flanges

All valves are available available in sizes from 1/4” through to any size.

Wall Thickness for Flanges

Schedule 5s through to Schedule XXS and heavier.

Dimensions and Pressure Ratings for Flanges:

– ANSI, MSS- SP-44, BS3293, API 605 150lb through to 2500lb
– Flange Facings: Raised Face, Ring Type Joint, Large Tongue & Groove, Small Tongue & Groove
– BS4504 – PN6, 10, 16, 25, 64
– BS10 – Table D, E, F, & H
– DIN Standards

Special items according to customer drawings.

Stainless Steel

  • A182 F304/L
  • F310
  • F316/L
  • F321/H
  • F347/H
  • F410
  • F440
  • 904L

Carbon Steel

  • A105, C22.8

Low Temperature Steel

  • A350 LF2, LF3, LF6

Alloy Steel

  • A182 F1, F5, F9, F11, F12, F22, F91

High Yield

  • A694 F42, F52, F60, F65, F7

6% Moly / Duplex & Super Duplex

  • A182 F44, F51, F53, F55

Nickel Alloys

  • 200, 400, K500, 600, 625, 800, 825


  • ALLOY 20
  • ALLOY C276
  • ALLOY B2


  • 5083, 5154, 5251, 6061, 6063, 6082

Unusual Grades

  • Bronze, Brass, Copper
  • Cupro Nickel & Titanium

Slip On Flange

Slip On Flange is slightly larger than the outer diameter of the pipe it is to be used with. The pipe is slipped into the Flange prior to welding both inside and outside. High quality Slip on Flanges are ideal for lower pressure applications. The Slip On Flange’s ease of fitting and welding also reduces fabrication costs.

Blind Flange

Blind Flange is a Flange which has no bore hole and consequently it is used to close the end of a piping system. The Blind Flange is sometimes machined to accept a pipe of the nominal size to which reduction is being made. The Blind Flange reduction can be either threaded or welded. A Blind Flange also allows easy access to a line once it has been sealed.

Weld Neck Flange

Weld Neck Flange is drilled with the wall thickness of the Flange having equal dimensions to the matching pipe. The lighter the pipe is the larger the bore is in the Weld Neck Flange. And conversely the heavier the pipe is the smaller the bore is in the Weld Neck Flange. Weld Neck Flanges are usually used in high pressure systems and are suitable for cold or hot temperatures.

Socket Weld Flange

Socket Weld Flange is similar to a Slip On Flange, howeverSocket Weld Flanges have an internal recess on the inside diameter to allow for a smoother flow of the process fluid.

This creates a smooth bore with the proper welding and grinding. However a Socket Weld Flange can be more expensive than a Slip On Flange due to the more intricate machining. Socket Weld Flanges were initially developed for use on smaller sizes of pipe at higher pressure ratings.

Threaded Flange

Threaded Flange is usually confined to a special application. The main benefit of a Threaded Flange is that it can be assembled without welding which makes it perfect for extremely high pressure services.

Sometimes a seal weld is also used in conjunction with the threaded connection of the Flange.

A Threaded Flange is unsuited for conditions involving temperature or bending stresses of any magnitude. Particularly under cyclic conditions where leakage through the threads may occur in relatively few cycles of heating or stress.

Lap Joint Flange

Lap Joint Flange is usually used in conjunction with Lap Joint Stubs. Lap Joint Flanges in carbon or low alloy steel piping systems are best used when frequent dismantling for inspection and cleaning is required. The use of Lap Joint Flanges at points where severe bending stress occurs should be avoided.

Orifice Flange

An Orifice Flange is intended for use instead of standard pipe Flanges when an orifice plate or flow nozzle must be installed. Pairs of pressure tapings are machined into the Orifice Flange, making separate orifice carriers or tapings in the pipe wall unnecessary.

Orifice Flanges cover all standard sizes and ranges, and all common Flange materials.


Spectacle Blind Flange

Spectacle Blind Flange allows you to be absolutely sure that an item of equipment is properly and securely blanked off with no possibility of any flow or leakage through a valve during maintenance.

The flow can be diverted to other items of equipment but not just bypassed around the blank as this would compromise the safety function of the Spectacle Blind. The flow has to valve off and pressure relieved prior to loosening Flange bolts and swinging the blind.

Spades and Spacers

Spades and Spacers are designed to isolate sections of pipe to prevent contamination and allow inspection.

Spades and Spacers are made from duplex, super duplex, 6% moly, nickel alloy and stainless steel to ensure they are strong and corrosion resistant.

Spades and Spacers are available dimensionally in accordance with API 590 and ASTM 16.48 or to customer requirements.

Anchor Flange

An Anchor Flange is designed to control internal pressure and temperature induced thrust in pipeline systems.

Swivel Ring Flange

Swivel Ring Flange allows easy alignment. An important
and critical feature when bolting sub sea pipeline Flanges together for example.

The outer ring Flange of the Swivel Ring Flange assembly is held in position by a retainer ring that freely rotates around the inner weld-neck hub for quickly positioning the bolt holes of the two joining Flanges.

Bespoke Flanges

Full Supply Ltd can also provide fully customised Bespoke Flanges to client drawings, calculations can be supplied on request. If you have a special requirement please contact us with details of your needs for more information, calculations or quotes.

Flanged Fittings

We also supply a variety of Flanged Fittings including Welding Outlet Flanges, Nip Outlet Flanges, Elbow Outlet Flanges & Lateral Outlet Flanges.


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