What are the 6 most common flanges?

The following are the 6 types of flanges most common flanges in process piping systems.

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1. Slip On

As made obvious by their name, these pipe flanges slip over the pipe. They&#;re manufactured with an inside diameter that is slightly bigger than the pipe&#;s outside diameter. These attachments are connected to the pipe via fillet weld at the top and bottom of the flange.

Slip on pipe flanges are typically provided with a raised or flat face. When a raised face is necessary for slip on pipe flanges, the standard height is 1/16&#; for slip on pipe flanges under 400#. For slip on pipe flanges of 400# and up, the standard slip on pipe flange raised face height is 1/4&#;.

Coastal manufactures slip on pipe flanges in all steel material grades, including carbon slip on pipe flanges, stainless steel slip on pipe flanges and alloy slip on pipe flanges.

Slip on pipe flanges in stock include AWWA slip on pipe flanges, ANSI slip on pipe flanges, Pressure Vessel slip on pipe flanges and slip on pipe flanges that match the OD and drilling of ASME flanges.

2. Weld Neck

Weld neck flanges are easily recognized by the tapered hub where the pipe welds to the flange. This transfers stress from the flange to the pipe instead. It also reduces the stress concentration from the base of the hub. Weld neck flanges are often used for applications where high pressure is a factor. The inside diameter of the flange is designed to match the pipe&#;s inside diameter. Weld Neck Pipe flanges with a hub have published specifications that range from 1/2&#; thru 96&#;. Our company provides these in all material grades, specifications and sizes.

Weld neck pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for weld neck pipe flanges, the standard height is 1/16&#; for weld neck pipe flanges under 400#. For weld neck pipe flanges of 400# and up, the standard weld neck pipe flange raised face height is 1/4&#;.

Coastal Flange manufactures weld neck pipe flanges in all steel material grades, including carbon weld neck pipe flanges, stainless steel weld neck pipe flanges and alloy weld neck pipe flanges. Coastal Flange also has many different weld neck pipe flanges in stock and ready to ship. Weld neck pipe flanges in stock include ANSI B16.5 weld neck pipe flanges, ASME B16.47 Series &#;A&#; weld neck pipe flanges, ASME B16.47 Series &#;B&#; weld neck pipe flanges, Pressure Vessel weld neck pipe flanges.

3. Blind

Blind pipe flanges are used to seal the end of piping systems or pressure vessel openings. They are commonly used for testing the flow of gas or liquid through a pipe or vessel. Blind pipe flanges also allow for easy access to the pipe in case work must be done inside the line. They are oftentimes used for high pressure applications.

Blind pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for blind pipe flanges, the standard height is 1/16&#; for blind pipe flanges under 400#. For blind pipe flanges of 400# and up, the standard blind pipe flange raised face height is 1/4&#;.

Coastal Flange manufactures blind pipe flanges in all steel material grades, including carbon, stainless steel, and alloy blind pipe flanges. Coastal also has many different blind pipe flanges in stock and ready to ship. Blind pipe flanges in stock include ANSI B16.5 blind pipe flanges, ASME B16.47 Series &#;A&#; blind pipe flanges, and ASME B16.47 Series &#;B&#; blind pipe flanges.

4. Lap Joint

Lap joint pipe flanges slide directly over the pipe and are most commonly used with stub end fittings. A pipe is usually welded to the Stub End and the Lap Joint pipe flange is free to rotate around the stub end. The benefit of this is that there will not be any issues with bolt hole alignment. Lap Joint pipe flanges are often used for applications that require frequent dismantling.

Slip on Pipe flanges with a hub have published specifications that range from 1/2&#; thru 24&#;. Sizes above 24&#; are produced as lap joints to slip on dimensions. Coastal Flange provides Lap Joint pipe flanges in all material grades, specifications and sizes.

Coastal manufactures lap joint pipe flanges in all steel material grades, including carbon, stainless steel, and alloy lap joint pipe flanges.

5. Threaded

Threaded pipe flanges are similar to slip-on pipe flanges except the bore of threaded pipe flange has tapered threads. Threaded pipe flanges are used with pipes that have external threads. The benefit of these pipe flanges is that it can be attached without welding. Threaded pipe flanges are often used for small diameter, high pressure requirements.

Threaded pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for threaded pipe flanges, the standard height is 1/16&#; for threaded pipe flanges under 400#. For threaded pipe flanges of 400# and up, the standard threaded pipe flange raised face height is 1/4&#;. Today, threaded flanges are used almost exclusively for utility service such as instrument air, plant air, nitrogen, potable, and raw water.

Coastal  manufactures threaded pipe flanges in all steel material grades, including carbon threaded pipe flanges, stainless steel threaded pipe flanges and alloy threaded pipe flanges. Coastal also has many different threaded pipe flanges in stock and ready to ship.

6. Socket Weld

The Socket weld Flange is similar to the Slip on Flange as the pipe slips inside the Flange into a socket and is secured with a fillet weld at the hub on the back side of the flange. Per ASME B31.3 Socket weld Flanges are only to be used in noncritical applications where pressure, temperature or product corrosion is not an issue.

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Socket Weld pipe flanges are typically provided with a raised face, flat face, or RTJ facing. When a raised face is necessary for socket weld pipe flanges, the standard height is 1/16&#; for socket weld pipe flanges under 400#. For socket weld pipe flanges of 400# and up, the standard socket weld pipe flange raised face height is 1/4&#;.

Coastal Flange manufactures socket weld pipe flanges in all steel material grades, including carbon socket weld pipe flanges, stainless steel socket weld pipe flanges and alloy socket weld pipe flanges. Coastal Flange also has many different socket weld pipe flanges in stock and ready to ship.

Contact Coastal Flange with any questions or to receive a quote tailored.
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Flange O&#;Clock: Episode 1

What are flanges? Join host John Barnett in Texas Flange&#;s new educational video series, Flange O&#;Clock, as he demonstrates and explains everything you need to know about flanges.

Today&#;s episode goes over the 6 most common flange types; Weld Neck, Threaded, Slip On, Lap Joint, Socket Weld, and Blind per ASME B16.5. Thank you for watching and we hope you learn a lot from our videos! If there&#;s anything you&#;d like to learn that we didn&#;t cover here, leave us a comment and we&#;ll get your answer ASAP.

In this video, I&#;m going to go over the six basic types of flanges per ASME B16.5

The Weld Neck, Threaded, Slip-On, Lap Joint, Socket Weld, and Blind Flange.

All six flanges before me are for one-inch nominal pipe size, class 150 per B16.5, and raised face. Or in short, 1&#; 150# RF, with the exception of the Lap Joint, which will be explained later.

Weld Neck Flanges

The Weld Neck flange is the most commonly requested flange. It features a neck extension with a tapered hub, a 37.5-degree bevel, and a 1/16&#; landing at the point of the weld. This will butt directly onto another pipe with a similar level, where it will be welded together with a 75-degree weld.

Because it butts directly onto the pipe, it is going to match the OD and the ID of the pipe. You&#;ll need to tell us the schedule you&#;re using. You could also give us the ID, or inner diameter, which is another word for the bore, or you can tell us the wall thickness. Once you give us any of those, we will be able to make your flange meet the pipe exactly.

Threaded Flanges

The Threaded flange, or companion flange, features an NPT. In this case, it&#;s a one-inch flange, so it has a one-inch Female National Pipe Thread center, which is used to mate to male threaded pipe. It&#;s a tapered thread, so when the pipe is fully threaded down, it will bottom out, like so. Threaded flanges are commonly used in reducing connections as well.

Slip-On Flanges

The Slip-On flange is a simple and cost-effective alternative to the Weld Neck flange. It has a straight-through ID, and as the name implies, slips on to pipe. The pipe is then welded along the OD on the top of the hub. This separates the heat-affected zone from the rest of the flange.

In larger sizes and higher-pressure classes, you&#;ll see more of a hub. Other applications might call for the pipe to be pulled back 3/16 of an inch, and a 90-degree fillet weld to be performed on the ID of the flange. It is possible to have both welds performed if the application calls for it.

Lap Joint Flanges

The Lap Joint flange is similar to the Slip-On, except it is always flat-face, and has a radius on the ID, or inner diameter, to accommodate a stub end. The normal application calls for the flange to slide up the pipe for your stub to be butt-welded directly onto your pipe, and then your flange will slide over the weld onto the stub end.

You&#;ll see the stub end&#;s flair, or flanged portion extends out and creates the raised face section of the bolted flange connection.

Socket Weld Flanges

The Socket Weld flange is similar to a Slip-On, except that it has a counter-bore step. This is convenient in situations where there is a space limitation. Just like a Slip-On, the pipe will go into the flange, but then butt up against that counterbore step, creating a flush surface along the ID of the pipe, and the ID of the flange.

So, just like Weld Necks, Socket Welds will need to be specified with a schedule, or a bore, or ID, or the pipe&#;s wall thickness. You tell us any of those, and we&#;ll make sure you get the flange you need.

Blind Flanges

The Blind Flange has no ID or threads. It is only used to cap off a line, bolting onto another flange, flanged fitting, or flanged valve. You&#;ll also notice it has no hub. Per B16.5, Blinds do not require hubs.

You can also alter a Blind by drilling through to create a reducing Slip-On, from the Blind, or drill and tap to create a reducing Threaded from the Blind. In applications where you require a hub, which you&#;ll see in another video, we can provide a high hub blind and then alter it per your requirements.

These six flange types are, of course, not the only types of flanges available. If you have the need for anything else, be it plate flanges, metric flanges, high yield, carbon steel, stainless steel, nickel alloys, or anything else that&#;s round with bolt holes in it, we&#;d be happy to help.

If you have any questions, give us a call or shoot us an , that way we can get you the flanges you need, when you need them.

If you still need help deciding which is better for your project, pipeline, or job, feel free to call (281-484-) or  the Texas Flange sales office anytime from 8 am to 5 pm Monday through Friday. Or you can drop a quick question or inquiry into our quick contact form. With our decades of expertise, we can help you get the flanges you need.

Check out Episode 2 HERE! We explain pressure class, why it&#;s important, and the difference between the different classes from 150# to #!

If you&#;d like to learn more about flange specifications, types uses and more feel free to peruse our informational blog posts, free 3-D and CAD drawings, or flange charts.

If you want to learn more, please visit our website Flange Supplier.