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Flanges

Flanges are used to provide support to pipework, for blocking off a pipeline or for connecting different items of a pipeline together.

Pipe flanges are usually discs/rings or collars that are welded or screwed to the pipe end and fastened with nuts and bolts. A gasket is inserted between the two mating flanges to provide a tighter seal.

Broder Metals Group provide flanges in a number of forms, such as weld neck, slip on, blinds, lap joints, threaded pipe flanges and socket weld flanges. We have developed pressure specifications and can supply bespoke pipe flanges, from forgings or plate as required.

As part of our service we welcome enquiries to provide advice on the most suitable materials to be used for your needs.

Weld Neck

Weld Neck Flange Standard Bore Weld Neck Flange

Weld Neck flanges are used most commonly for their high-pressure application, at Broder Metals we provide Weld Neck in a range of standards and materials.

The inside diameter of the weld neck pipe flange is machined to match the inside diameter of the pipe, which fits over the neck of the flange. The two elements are then connected by welding around the over-lapping seal area.

Application

This design makes for a stronger connection as mechanical stress is transferred from the weld neck pipe flange to the pipe itself.  As a result there is a reduction in tension at the base of the hub of the weld neck flange. This allows weld neck flanges to be used for much higher pressure applications than other flanges.

Materials

We can supply Weld Neck flanges in stainless steel (including 304, 316 and 321), duplex/super duplex (e.g. F44, F51, F53, F55), nickel alloy  (including alloy 625, alloy 718), Titanium (grade 2 and 5), high yield carbon steel and 6 Moly steel.

Standards

Broder Metals Group can supply against the major standards

ASME/ASTM B16.5 – 0.5″ – 24″ in 150 lb – 2500 lb ratings

ASME B1647 – up to 60″ in 150 lb – 300 lb ratings

ASME B647 – Series A (MSS SP44) – up to 47″ in 600 lb – 900 lb ratings

ASME B647 – Series B (API 605) – up to 60″ in 75 lb – 300 lb ratings

BS 3293 – up to 60″ in 15 lb – 300 lb ratings or up to 48″ in 600 lb – 900 lb ratings

BS 10/AW/WA – up to 60″ in Classes B, D, E, F, G, & H

BS 4504/BS EN1092 – up to 60″ in PN 2.5 – 250

API 6a/6BX – UP TO 24″ IN 3 – 20,000 psi rating

Slip-on

Slip On Flange Slip On Flange

Slip-on flanges are a low cost solution providing a tight fit. At Broder Metals we provide Slip-on flanges in a range of materials and standards.

The design of a slip-on flange is in the name, as each flange is built with a larger diameter than the connecting pipe. This allows the flange to slip over the pipe, for a tight fit before welding completes the seal. Slip-on pipe flanges are secured to the pipe with a fillet weld at the top and bottom of the pipe connection.

Application

Slip-on flanges are often chosen because of their lower cost, both per unit and in reduced installation costs. These lower installation costs occur as less accuracy is required in cutting the pipe to length, in aligning bolt holes and squaring flange faces.

The slip-on flange can be further categorised into ring or hub slip-ons. Both still slip-on the pipe, but those with a hub have standard published specifications that range from 1/2″ through 96″, while ring slip-on flanges have published standard specifications that range from 1/2″ through 144″.

Materials

At Broder Metal Group we can provide slip-on flanges in stainless steel, (including 304, 316 and 321), duplex/super duplex (e.g. F44, F51, F53, F55), nickel alloy (such as 625, 718), Titanium  (grade 2 and 5), high yield carbon steel and 6 Moly steel.

Standards

We can supply against the major standards

ASME/ASTM B16.5 – 0.5” – 24” in 150 lb – 2500 lb ratings

BS 3293 – up to 60” in 15 lb – 300 lb ratings or up to 48” in 600 lb – 900 lb ratings

BS 4504 / BS EN1092 – up to 60” in PN2.5 – 250

Blinds

Blind Flange  Blind Flange

Blind flanges are used to provide a hatch at the end of a piping system or pressure vessel opening which can be sealed to prevent content loss.

This flange can additionally be opened to allow access for maintenance or for pressure testing the flow of liquid or gas through a pipe or vessel.

Because of their versatility blind pipe flanges can be used in most pressure applications.

Materials

We can supply stainless steel blind flanges (such as 304, 316 and 321), duplex/super duplex blind flanges (e.g. F44, F51, F53, F55), nickel alloy blind flanges (including alloy 625, alloy 718), Titanium blind flanges (grade 2 and 5), high yield carbon steel blind flanges and 6 Moly steel.

Standards

Broder Metals can supply against the major standards:

ASME/ASTM B16.5 – 0.5” – 24” in 150 lb – 2500 lb ratings

ASME B1647 – up to 60” in 150 lb – 300 lb ratings

ASME B647 – Series A (MSS SP44) – up to 47” in 600 lb – 900 lb ratings

ASME B647 – Series B (API 605) – up to 60” in 75 lb – 300 lb ratings

BS 3293 – up to 60” in 15 lb – 300 lb ratings or up to 48” in 600 lb – 900 lb ratings

BS 10/AW/WA – up to 60” in Classes B,D,E,F,G & H

BS 4504/BS EN1092 – up to 60” in PN 2.5 – 250

API 6a/6BX – UP TO 24” IN 3 – 20,000 psi rating

API 590/ASME B16.48 – up to 24” in 150 lb – 2500 lb

Lap Joint

Lap Joint Lap Joint Flange

Application

Lap joint flanges slide over the pipe and are most commonly used with Stub End Fittings.

Typically the pipe is welded to the Stub End and the lap joint flange is free to rotate around the stub end, eliminating issues with bolt hole alignment.

Lap joint flanges are often used in applications subject to frequent dismantling.

For more information on our lap joint flanges contact us for a free enquiry.

Threaded Pipe flanges

Threaded Pipe Flange Thread Pipe Flange

Threaded pipe flanges are similar to slip-on flanges except that the bore has tapered threads to accept pipes with matching external threads. This eliminates the need for welding to secure a strong seal. Threaded pipe flanges are best used for small diameter but high pressure environments.

Socket Weld flanges

Socket Weld Flange Socket Weld Flange

The pipe and flange are connected by inserting the pipe into the socket end of the flange, and then applying a fillet weld around the top of the seal.

This seal eliminates any possibility of weld material obstructing or constricting the bore and flow of the fluid or gas inside of the pipe. Socket-weld flanges are typically used to connect smaller sizes of high pressure pipes.

Flange Dimensions

Choosing the correct flange for a specific job is determined by the size of pipe to be connected and the pressure (class rating) the assembly will need to cater for.

Most of these dimensions have been standardized and published as ASME, MSS, API or other specifications, so that flanges can be used with reliability. If you need a non-standard dimension, please contact us so we can see how we can help.

The most common dimension standard we are asked to supply to is ASME/ANSI B16.5, which provides dimensions and tolerances for flanges in pipe sizes from 1/2″ through 24″ and in classes ranging 150 lb through 2500 lb.

Please find attached the dimension values reproduced (by pipe size within class ratings).

Weld Neck Flanges Information Sheet

Blind Flanges & Slip-On Flanges Information Sheet

Flange Dimensions Information Sheet