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A Note on Orifice Flanges per ASME/ANSI B16.36

 

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!

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Quick industry note on waterworks flanges.

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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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News from the Industry

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 December 7, 2016.  If an affirmative decision is found, Commerce will instruct U.S. Customs to collect antidumping duty cash deposits to offset the subsidies.

 

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All emails reviewed at Texas Flange

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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.

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A Note on Stub Ends

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There are two standards to which Texas Flange offers a variety of stub ends to accompany our flanges. The MSS standard is the regular length stub end and the most commonly used in the flange industry. The ASA type stub end is of a longer length and is less common than the MSS type, though it may be more suitable for your application.

 

 

MSS Type A stub ends are the industry norm and are utilized with standard flat face lap joint flanges. The lap thickness of the stub end typically meets the thickness of the schedule pipe it accompanies, and the exterior of the base has a curved machine radius for the lap joint flange to mate flush over the stub end. There are many instances in which lead time is critical and of more importance than adherence to existing ANSI / ASME flange specifications, and as such our customers will often choose to purchase a slip on flange and have the face machined to meet the radius requirement of the corresponding stub end piece. Furthermore, a standard lap joint flange will typically have a longer hub length in comparison to a slip on flange, but this is often considered unnecessary for many applications. Fabricators and field workers alike often choose to go this route in the event that a lap joint in a particular size or material grade is unavailable.

 

 

Texas Flange can provide custom stub ends to suit your application, provided we are given a technical drawing with dimensions of the necessary requirements. This is sometimes an option for when fabricators choose to utilize custom lap joint or mounting flanges to fit their application.

 

 

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