The specification for orifice flange sets is not particularly clear about ring groove connections for these flange assemblies. Our proprietary CAD flange drawings can give the impression that ring grooves are cut into the face of a flange that may be considered “flat face,” however this is not the case if you review the dimensions. For RTJ orifice flanges, the flange thickness *exclusive* of the depth of the groove must meet the same minimum thickness as that of a standard raised face orifice flange assembly, exclusive of the height of the raised face. Visually speaking, though it may *appear* that the flange groove is cut into a flat face, you can confirm with the dimensions outlined in the B16.36 flange specification that it is more accurately what some would refer to as a “full face” with extra thickness (how much thickness depends on the depth of the groove, just as it would be defined in ASME/ANSI B16.5). Some manufacturers still machine down the should of the face to make it appear similar to the raised portion of a proper RTJ groove flange, in order to avoid initial confusion. Also, note that larger RTJ orifice flanges will require angular taps to ensure proper clearance with the bottom of the groove, which cannot be altered or modified in any way.
In other words: NO, you cannot take a raised face orifice flange, machine down the face, add a groove, and just call it an RTJ orifice flange. Minimum dimensional requirements for flanges must meet the tolerances outlined in ASME / ANSI B16.36 and B16.5 No shortcuts, or else you are out of compliance!
Please refer to pages 75-76 in our catalog to confirm Ring Type Joint Flange dimensions. Link to catalog below.
If you still have questions, a member of our sales team would be more than happy to help!
Either call us at: T. 800-826-3801 :: 281-484-8325
Or email us at: Sales@texasflange.com
The American Water Works Association has suspended the utilization of “hub” type flanges in their C207 and associated specifications. All flanges per AWWA specs are either “ring” type slip on flanges or “blind” type flanges. The aforementioned “hub” type flanges as outlined in AWWA C207 Class D and C207 Class E are derived from ASME specifications 125# Lightweight and 125# Slip On, respectively. We will still provide flanges as dual certified to both of these specifications, with the understanding that they will not be manufactured and stamped per the latest update of the AWWA standard.
As is standard from Texas Flange, you may request these flanges in any commercially available material grade you require. The most common are still carbon flanges, mild steel flanges and stainless steel flange variants. Please be advised that while many of these items are available in stock in carbon steel grades, most stainless, chrome, and nickel alloy type flanges are made to order, given the popularity of carbon steel flanges for the majority of water works flange and piping projects. Their lower pressure requirements and ambient temperature operation typically mean a more exotic alloy flange is not required. Any questions or concerns, please feel free to contact any of our trained sales staff here at Texas Flange.
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Boltex and Weldbend Corporation Applaud ITC Preliminary Injury Decision on Unfairly Traded Imports
Houston, TX and Argo, IL, August 12, 2016 – Today Boltex Manufacturing Co., L.P. (“Boltex”) and Weldbend Corporation (“Weldbend”) announced that the U.S. International Trade Commission (“ITC”) preliminarily determined that imports of finished carbon steel flanges from India, Italy and Spain are causing injury to the domestic industry. The Commission vote was 6-0, resulting in an affirmative decision. The ruling by the ITC demonstrates that there is a reasonable indication that imports are injuring the domestic flange industry and American workers. As a result of this decision, these cases against foreign producers in the above-named countries will proceed.“We applaud the affirmative decision found by the ITC, ruling that imports of finished carbon steel flanges from India,Italy and Spain have caused injury to U.S. producers,” says Frank Bernobich, President of Boltex. “Today’s vote marks a step in the right direction to restore fair trade practices and allow the market to operate on a level playing field.”“As family owned and operated businesses, the decision to file petitions against these unfair trade practices was a significant undertaking, but one that was necessary for our survival,” says James Coulas, Jr., President and CEO of Weldbend. “For generations Weldbend and its employees have manufactured great products and we only ask for the ability to operate in a fair market. We are extremely pleased with the ITC’s preliminary decision and that our cases can proceed.”
Boltex and Weldbend filed petitions concurrently with the ITC and the U.S. Department of Commerce (“Commerce”) on June 30, 2016. The ITC initiated their investigation on June 30, 2016 and Commerce initiated their investigations on July 20, 2016.Commerce will calculate antidumping margins and subsidy rates, which are designed to offset the amount by which the product is sold at less than fair value and the amount by which the product benefits from unfair government subsidies. In the Department’s initiation notice the Department estimated the dumping margins for steel flanges as “(1) India ranges from 17.80 to 37.84 percent; (2) Italy ranges from 15.76 percent to 204.53percent; and (3) Spain ranges from 13.19 percent to 24.43 percent” The subsidy rate from India was estimated to be above de minimis. Commerce is currently scheduled to make its preliminary subsidy determination on September 23, 2016, and its preliminary dumping determinations on . If an affirmative decision is found, Commerce will instruct U.S. Customs to collect antidumping duty cash deposits to offset the subsidies.
Just a friendly reminder…here at Texas Flange we try to make the flange requisition and purchase experience as seamless as possible for our customers. This includes providing commodity stock pieces by the bulk load, as well as creating custom flange pieces for unique applications. Regardless of the scope of your flange inquiry, our sales and technical support staff is trained to provide you with whatever you need, even if your assigned sales member is out of the office.
All emails are monitored and answered when any individual is out of the office, so that you don’t need to hunt down a different email address in order to get your questions answered and your orders processed. Just send in your inquiry for flanges as you normally would, and we will answer back from the email address of the same representative you are familiar with. This allows your flange sales rep to review the correspondence from their own email archives when they return and gives them the ability to ensure all requirements are communicated clearly to every member of the production team.
All flange orders are digitally archived in a manner that allows for sales and support staff to make the necessary notations up through and beyond the shipping and invoicing process and as a result, all sales staff should be able to address any concerns you may have regarding your flange order.
Always remember that we at Texas Flange are working hard with our production team to review your request and provide accurate pricing and lead time as necessary.
Ring type joint flange face surfaces are increasingly popular options with regards to flange connections, and offer a good alternative to the standard raised face in specific applications. Typically, these alternate facings are utilized in higher pressure and temperature service projects, and help to provide a more effective sealing solution to media critical pipeline and pressure vessel infrastructure. Although only an option in ANSI/ASME class flanges, they are required as the standard surface sealing in API specification flanges. This is due to the fact that API flanges typically operate at a higher pressure in comparison to their ANSI/ASME flange counterparts.
The seal of a ring type joint gasket is meant to occur under the torque and force of closing the bolt and hardware after mating one flange to another. Typically, ring type joint gaskets are made of softer material than the actual metal of the flanges they are sealing. The most common of these materials is a soft iron which are used both in API and ASME/ANSI flange connections. Applying a slow and steady pressure of tightening on the hardware of the flange causes the gasket to get “crushed” within the ring joint surface, and this helps to prevent any type of media leakage during operation of the flange assembly.
These gaskets are designated by an “R” number, of which the dimensional data, and the corresponding nominal and pressure class flange, are available on our website. R gaskets are available in oval and octagonal configuration. Given the smooth sealing surfaces of ring joint faces as designated by ASME B16.20, both configurations work well, and are not typically noted in purchase as they are virtually interchangeable.
Bottom line – when in doubt, higher pressure and temperature applications typically call for ring joint facings given their reliability and usefulness when optimal surface sealing is necessary. Give us a call to help you with your ring joint flanges, or let us know if an alternate flange facing is an option.
We have received several inquiries over the years for nozzle type flanges, commonly referred to as “long weld necks.” These types of flanges and the different varieties in which they are offered are meant to replace pipe, not weld up to it, and as such we would like to clarify for everyone in the industry that these items do not have schedule bores. A typical weld neck flange has a weld prep at the tip of the neck to weld up to matching pipe, whereas long weld neck flanges, or “nozzles,” are square cut at the ends for the purpose of utilization with your tank or alternate assembly. As such, many inquiries which we receive include schedule bores that we eliminate in our quote reply to our customers, as these schedules are not applicable.
Our nozzle flanges are available in the more common lengths of 9”, 12”, and 16”, as well as any larger or smaller overall lengths to suit your needs. Typically, the larger the nominal size and pressure class flange, the larger the overall length requested. However, this is entirely subjective and at the discretion of the customer. Contrary to popular suggestion, there is no universal “standard” length because these parts are made in accordance with the application necessary. We offer a variety of barrel sizes, from the more familiar long weld necks, heavy barrels, and equal barrels. We also provide intermediate barrel products depending on your needs. As most regular weld neck flanges, these nozzles are typically made from forged carbon steel and stainless steel grades, though we do get the occasional request for chrome alloy and nickel alloy nozzle flanges. Feel free to submit your own technical drawing for quotation to our sales department and we would be happy to help get you the flanges you need.
The 2003 Edition of ASME B16.5, Pipe Flanges and Flanged Fittings NPS ½ through NPS 24 Metric/Inch Standard, contains millimeter dimensions and pressure-temperature ratings expressed in bar, with US Customary units in either parenthetical or separate forms. The purpose of this paper is to offer an explanation about why some of the conversions were made the way they were.
The cognizant committee had two primary goals during the development of the metric values shown in the 2003 Edition:
• The dimensions in mm should reflect the needed precision as much as possible.
• Flanges manufactured using existing forging dyes and machinery settings based on the inch dimensions should be able to meet the requirements for the metric dimensions.
Conversion from the Original Fraction
ASME B16.5 dimensions before 1977 were expressed mostly in fractional inches instead of decimal inches. For example, 1/8 in. was shown as 0.12 in. or 0.125 in., depending on the intended precision of the dimension, starting in the 1977 edition.
Millimeter dimensions were converted from the original fractional inch dimensions rather than the decimal inch dimensions. For example, 1/16 in., when converted from the fraction, converts to 1.6 mm. The decimal “equivalent” (0.06 in.) converts to 1.5 mm. Some of the conversions shown in the tables will appear to be incorrect when converted from the decimal inch dimensions.
1/16 in. was sometimes converted to nearest 0.1 mm, sometimes converted to the nearest 0.5 mm, and at other times converted to the nearest 1 mm. The conversion depended on the needed precision of the measurement. So the millimeter equivalent for 0.06 in. is sometimes 1.6 mm, sometimes 1.5 mm and at other times 2 mm.
Dimensions that have tolerances are those that are considered to be needed for adequate fit-up and those important for integrity of the pressurized flanged joint. These dimensions were converted such that the metric dimensions are essentially the same as the US Customary dimensions, and the tolerances were selected such that the permitted deviations from the tabulated dimensions were nearly identical to those permitted by the US Customary dimensions.
Bolt circle diameter converted to nearest 0.1 mm. The committee believes this level of precision is needed to minimize problems with fit-up to other flanges, even though the tolerance on the dimension is 1.5 mm. Converting with less precision was expected to cause additional problems with centering metal gaskets as well.
Rev. June 10, 2004 1
Length through hub converted to nearest 1 mm. This dimension needs to be consistent in order to maintain overall dimensions for fabricated spools. The committee believes that maintaining this dimension to the nearest whole millimeter provides the needed precision.
Dimensions that have no tolerances are those that need not have precision for fit-up and don’t contribute significantly to the integrity of the pressurized flanged joint. Examples of those dimensions and the philosophy used to create the millimeter dimensions are:
1/16” raised face converted to 2 mm instead of 1.6 mm. Raised faces measuring something different than 2 mm meet the requirements of the standard. Conversion to the nearest mm reflects the intended precision of the dimension.
Outside diameter of flanges converted to nearest 5 mm. For example, NPS ¾ Class 600 Flange outside diameter. The 4-5/8” was converted to the nearest 5 mm (115) instead of the nearest whole mm (117) or tenth mm (117.5). Outside diameters measuring other than 115 mm meet the requirements of the standard. Conversion to the nearest 5 mm reflects the intended precision of the dimension.
Bolt hole diameters expressed in fractional inches. Inch dimension bolt holes were retained for flanges manufactured to metric dimensions. Inch bolts are recommended for use with these flanges. Extensive dimensional compatibility studies exploring the possibility of using metric as well as inch dimensioned bolting with ASME B16.5 flanges were conducted. The studies revealed that providing dimensions that allowed for the use of metric as well as inch dimensioned bolts, especially when combined with metal gaskets, was impossible. This conclusion was supported by experience with some flanges manufactured to ISO 7005-1, Metallic flanges – Part 1: Steel flanges.
The cognizant subcommittee did not intentionally change any of the requirements for dimensions in the 2003 Edition of ASME B16.5. The dimensions in mm reflect the needed precision as much as possible.
Flanges manufactured using existing forging dyes and machinery settings based on the inch dimensions should be able to meet the requirements for the metric dimensions. While acceptable dimension ranges are not precisely the same for the two units of measure, there is a significant amount of overlap. Still it is possible for a flange to meet the requirements in one system of units and not in the other.
My Grandfather, Gus Shirley, proudly wore this Texas Flange hat around his home in Zwolle, LA. He beamed at the idea of his grandchildren doing well. Shortly before passing away he gave the hat to my Dad, who wore it with the same sense of well being. Recently my father was traveling through Oklahoma and stopped at Bledsoe's Diner in Atoka. They have a tradition of hanging hats on the wall for good. My father thought the old hat was worn out and needed a final resting place. He hung it right above the coffer pot with the Company logo pointing straight out. If you ever make it to Atoka stop by Bledsoe's. Not for my mushy connection to the hat but for the great food. Blessing to all. I will eventually get back to blogging about flanges, but let's face it, there aren't a lot of changes in our industry.
When providing customers with custom flanges, we strive to accommodate project launch dates as much as humanly possible. At the same time, we have to qualify our commitment to expediting custom flanges with a bit of realistic tempering. By their very nature, custom flanges can be highly unique. Even minor changes to flange dimensions can affect the rate of expedition. Changing material flange grade tolerance can also affect production time. Obviously, too, the sizes of custom flanges will often determine how quickly they can be manufactured, checked for quality assurance, and shipped.
Smaller flanges are easier to expedite. Small to medium custom flanges that are small to medium in size can be manufactured in a relatively quick time frame. We have seen small flanges produced in as little as 5 business days and as many as 10. In the majority of cases, custom flanges have been expedited provided we were given sufficient lead time by our customer.
Larger, customized flanges require forgings of a certain size in order to produce the flange. Obviously, flange forgings in the larger sizes are not always as easy to come by as flange forgings in smaller sizes. This is why calling us as soon as you know you will need custom flanges is so important. The more lead time we have in producing multiple flange orders, the greater the likelihood is that we can expeditiously manufacture and ship your industrial flanges.
Email us your requirements for custom flanges today and let's see how quickly Texas Flange can get them out to you.
Does Texas Flange provide custom flange templates we can review and modify?
Yes. Texas Flange keeps detailed records of all orders. One of the reasons we do so is to help expedite repeat business. An even more important reason Texas Flange keeps such detailed records is to accommodate customers in need of custom flanges. We have an entire library of custom flanges designed by engineers who basically needed to modify existing ASME/ANSI standard flange specifications.
Examples of such modifications include non-ferrous metals flanges, low temperature flanges, stainless steel flanges, non-metallic flanges, carbon steel flanges, and alloy steel flanges for high temperature applications.
Minor dimensional changes are often all that are made to ANSI/ASME standards, although we have plenty of templates that also feature modified tolerances for higher or lower temperatures than standard operations typically experience. We can provide you with multiple flange templates that show which flanges represent the most suitable options for your project. Often you will find what you are looking for in what already exists in our inventory of weld neck flanges, slip on flanges, ring flanges, and blind/test flanges. Other flanges can be changed with only a few quick modifications to the template and be put into expedited production as soon as your flange drawings are finalized.
That is a very good question. Many people who call us looking for flanges think that we offer flanges in only one type of material grade. In fact, we offer flanges in all material grades.
The most popular material grades are made from carbon steel. We sell carbon steel pipe flanges and flanged fittings. We also supply stainless steel flanges that are used for a wide range of projects. Plate flanges can be ordered both waterworks and petrochemical applications. Bar flanges and forged spec flanges can also be made per the dimensions in our catalogue.
Two other popular industrial flange material grades include titanium flanges and aluminum flanges. These industrial flanges are typically ordered for projects that require project managers to save on weight but maintain strength. You can find a full range of aluminum flanges and titanium flanges by contacting us here at Texas Flange.
Many of the more recent projects we have been fulfilling call for flanges with a high level of corrosion resistance. The most popular industrial flange materials for these applications include inconel, incoloy, and hastalloy. These flanges are generally used in applications that involve high temperature surfaces.
Another common request is one that requires flanges manufactured for low temperatures. Regular carbon flanges, along with high yield carbon flanges, are commonly used in modern pipe infrastructure, many now in low temperature applications.
Yes. We began asking customers to email their flange orders back when email