Flange FAQs

If dat's the case, how come I can't find no dimensions for 'em?

Yessir, we sell reducing flanges (WN, SW, SO, Thrd) with the hubs or made straight from blinds (when it comes to SO or Thrd). Now, B16.5 gives us the rules for how we do dem reductions, but far as I know, ain't nobody printin' out the cut sheets. If y'all think on all the different combinations we could make, dat list would get mighty long, I reckon.

Now for dem reducing flanges with hubs, all dimensions except dat Length Thru Hub (or OAL) come straight from the regular flange dimensions, yessir.

From the larger size:

OD, Thk, Bolt pattern, RF Dia

From the smaller size:

OD at base of hub

OD at point of weld

IF (dependent on schedule)

Hub height

Usin' abbreviations found in the catalog, here’s how y'all can calculate the OAL for a reducin' weldneck:

Hub height = L2 – thk [all dims per smaller size]

LTH = Hub height + thk(of larger size) + face height

As an example, for a 4” x 3” 600# RF Red WN XH, one would calculate the LTH as follows: Hub height = 3.25 – 1.25 = 2.00” LTH – 2.00 + 1.50 + 0.25 = 3.75”

Well, dat depends entirely on what y'all are tryin' to get done. If you want a part dat's automatically covered under ASME Code, den forget about Slip Ons and opt for a Weld Neck from B16.47 Series A or B. If you don’t need to meet code or can run the math for your application, den your options open right up:

For dat Standard 150# drilling, we offer the “Class 125/ 150#” series. Dese are made per B16.1, which is a Cast Iron Spec, you see. We make 'em most often in Carbon Steel per A105. On top of dat, we offer 'em in Stainless 304, 316, and all dem other alloys too. Since the spec is for Cast Iron and the work out there usually calls for another material, dese are made “per B16.1 Dimensions only.” There's also a Class 250 option available, though folks don't use it near as much.

There are also 150#, 300#, 400#, 600#, and 900# Slip Ons dat were designed by Tube Turns to match the MSS-SP-44 spec (which was almost 100% brought into ANSI B16.47 under Series A.) Dese were originally designed to meet ASME Code of the time, but quite some time done passed since then and as a result in many cases they don't meet current design criteria. Nevertheless, they're used on a frequent enough basis dat we stock the contoured forgings in A105 and do a decent amount of business gettin' rolled rings to make 'em in other materials.

Folks have also asked us to make Slip Ons to match them B16.47 Series B dimensions. For dat, there's an agreed upon industry standard method that don't give no calculations but is mighty widely accepted. The basic design means cuttin' down dat weld neck forgin' and openin' up the ID.

Still more options remain, seein' as Taylor Forge designed many “Boiler Code” flanges that serve to add Slip On options in various classes. Dese parts are drilled per their design and don't match any other standard. The classes offered are 75, 175, and 350. For dat dated information on pressure-temperature allowance, see Taylor Forge Catalog 541 or holler at us.

Finally, I tell you what, the American Waterworks Association (AWWA) under their spec C207 got designs on a series of plate Slip-on flanges in Class B, D, E, and F. They also got them hubbed Slip Ons in Class D and E, yessir.

The short answer is Series A tend to be larger, heavier, have fewer bolt holes, and cost a bit more.

The longer answer is dat these were competin' specifications that got brought together in B16.47, just like it says in a note from our catalog: ASME done incorporated most of the MSS-SP-44 specification into B16.47 Series A and most of the API 605 Specification into B16.47 Series B.

They went and added Blinds to dese two specs, too.

Y'all might notice dat dese specs only include Weld Necks and Blinds. Now, for Slip Ons over 24”, you gotta look at either Industry Standard (which ain't automatically covered by ASME) or Boiler Code Flanges.

If y'all need a hand figurin' out which flange best suits your application, just holler at us.

We got a little joke 'round the office 'bout the fella who calls up askin' how much a flange costs. “Depends, which one of the 82 million different configurations are y'all needin'?”

We sure do offer expedited service, but givin' y'all a rule of thumb on the cost is mighty hard to do. It really just comes down to what material you need and which processes we gotta interrupt or run in overtime to get it done.

Suffice to say, we'll always try to appreciate and understand what y'all need, and we can usually turn parts out mighty quicker than “standard lead time” if you truly need it done right quick.

The one catch to this is if it takes 5 hours to machine the part, then the quickest we'll ever be able to quote is 5 hours. With dat in mind, y'all feel free to ask for the impossible and we’ll quote what we can, I tell you what.

The industry standard is to specify “TRUE 40” to distinguish Sch40 bores from Std bores for 12” NPS and larger when the application calls for the heavier wall.

The industry standard is to specify “TRUE 80” to distinguish Sch80 bores from XH bores for 10” NPS and larger when the application calls for the heavier wall.

Normally, when “Sch80” and “Sch40” are used without any other qualifier like wall thickness or ID, XH and Std bores (respectively) will be supplied.

When Sch40 or 80 are specified followed by an “S”, folks automatically assume they're talkin' 'bout Std and XH respectively.

AWWA C207 lays out the rules for dat carbon steel. The specs they give mean y'all can go ahead and use A283, A36, A516-70, A105, and A181-60.

Limitin' your spec to any singular variant of them materials can double or triple your costs, I tell you what.

So for general purposes we recommend leavin' the material callout for AWWA carbon steel flanges as “Carbon Steel per AWWA.”

Y'all are gonna get a part dat meets all the design rules set out in AWWA, and you ain't gonna pay no premium for some “preferred” material neither.

DSA stands for Double Studded Adaptor.

DSAs are built to join up dissimilar endpoints by boltin' each side right into it.

The DSA is faced and partially drilled and tapped to match the flange or the flanged connection on each opposin' side.

Typically dese require additional nuts and bolts, but we sell 'em separately since particular jobs can call for non-standard lengths.