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How To Inquiry A Flange

“One Flange, Please.”  In all seriousness, with over 100,000 standard variations, there are a few data points we must have to quote your project accurately. This data can differ between certain specifications, so we have elected to break it down below to lend a helping hand! Here is our short guide on how to inquiry a flange:

How to Inquiry A ½” – 24” – Covered by ASME B16.5 Flange
(This should cover most commodity items, but if this doesn’t seem to fit your application keep reading below.)

1. Quantity of Flanges
2. Nominal Pipe Size
3. Pressure Class (150#-2500#)
4. Facing Type (RF, FF, RTJ…)
5. Flange Type (Weld Neck, Slip On, Blind…)
a. IF Socket Weld OR Weld Neck Flanges
i. What Schedule bore do you need?
6. Material

Example: 5 Pcs – 6” 150# RF Weld Neck SchSTD A105

NOTE: Flange OD and quantity of bolts do not need to be specified when you use above quote structure.

FUN FACT: Did you know Sch Standard and Sch40 can differ if the flange you need is large enough? If you are not sure, let us know and we are always happy to help!

How to Inquiry A 26”-60” – Covered by ANSI B16.47 Flange
(Weld neck and blind flanges ONLY. For Slip-Ons, see next section)

1. Quantity of pieces needed
2. Nominal Pipe Size
3. Pressure Class
4. Facing Type (RF, FF, RTJ…)
5. Flange Type (Weld Neck OR Blind)
a. IF Weld Neck:
i. What Schedule bore do you need?
1. If needed, check out our Flange Bore Chart to confirm dimensional data.
6. Series A or Series B?
a. Not sure what the difference is? Check our FAQ to learn more! Or view our catalog for full dimensions!
7. Material

Example: 2 Pcs – 32” 600# RF Blind Ser.B A105

How to Inquiry Slip On Flanges Larger Than 24”

Unlike slip on’s 24” and smaller, which neatly fall under B16.5’s singular configuration per class, slip on’s larger than 24” get a little more complicated. We have a section in our FAQ called “How do I call out a Slip On Flange above 24”?” and we encourage you to check it out if you need more clarification.

In short, the following specs are the most commonly requested for this type of large diameter slip on:

• Industry Standard 125LW, 125/150, Class 250
• Boiler Code Class 75, 175, 350
• B16.47 Ser.A Dimensions per Tube Turn
• B16.47 Ser.B dimensions with 1” hub

Example: 2 Pcs – 30” 150# RF Slip On Series A per Tube Turn A105


How to Inquiry An American Waterworks Association (AWWA) Flange

1. Quantity of pieces needed
2. Nominal Pipe Size
3. Class (B, D, E, F)
4. Type (Ring, Hub, Blind)
5. Material (If not standard AWWA carbon steel)

Example: 4 Pcs – 30” Class D Ring C/S


Need something Custom?

Don’t worry if you need something custom/special!! We can quote from a drawing if you send it in to one of our sales team! Another option is to call us, or email [email protected]!!

PRO TIP: Feel free to find the standard drawing you need to modify in our CAD / 3D Flange Drawings page, mark it up, and send it over! Conversely, we have blank flange templates for you to modify, just ask your salesman for one! Please make sure your project engineers certify the modifications! We know a whole lot about flanges, but not so much about anything else.


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