All Texas Flange products come with heat codes for traceability. Each code references a “heat”; a single grouping of forgings created from the same piece of billet in one forging session. Essentially, this heat code is the “DNA” or “fingerprint” of sorts for identifying the physical and chemical composition of our flanges or custom components. Typically, an extra piece is forged to obtain physical traits by destructive testing (referred to as “crashing” a piece) per ASME code. Chemistry values include the percentage of alloying elements such as Carbon, Chromium, Nickel, Sulfur, Phosphorus, Aluminum, and so forth. Physical values are provided on Material Test Reports (MTRs) with respect to the requirements of the material. As an example, some flanges undergo heat treatment processes like normalization or quenching and tempering, and as ASME flanges in pressure classes 400# and above require ASTM A105 carbon steel flanges to be heat treated automatically per code, this information is included in the report.
All of this information is printed on a Material Test Report that certifies the flange material to the appropriate ASTM/ASME specification. Texas Flange provides all flanges with MTRs per EN10204 3.1* at no additional charge. These MTRs are shipped with the flanges ordered or emailed directly to you at your request once the order is completed. Occasionally, our customers will request a C of C (certificate or letter of conformance) to go with their order, and we provide this free of charge as well. Rest assured that providing flanges per the requirements of your purchase order are of utmost importance to us. Quality is critical in our service of providing materials for pressure vessels, refineries, offshore and onshore rigs, pipelines, and a seemingly endless number of alternate industrial applications. Give us a call or shoot us an email with any questions or concerns on your order.
*Note: the former designations 3.1B and 3.1C have been revised to just 3.1 and 3.2, respectively. Current 3.1 meets all requirements of the previous 3.1B.
Texas Flange offers an extensive range of industrial flanges and fittings. Our clients utilize these flanges in various industries, including offshore and onshore petrochemical, waterworks, pressure vessel, and construction, to name a few. All of our flanges are fabricated using ASTM, ASME, and AISI grade steels and alloys to ensure quality, durability, and compliance with the latest specifications in each industry. A sample CAD drawing for an 8” 300# weld neck flange which we recently provided in grade 2205 Duplex Stainless Steel for use in a refinery can be found here. These updated flange models posted last year are very popular with engineers, draftsmen, and sales/purchasing agents and have proven quite effective in assisting our customers with their flange requirements. Note that we also provide custom flange templates for your own utilization, should you require a weld neck flange with a custom bore size or a special facing outside of typical ANSI established dimensions. Please feel free to contact us with your flange inquiry via email, fax, or phone.
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.
It's time to update your copy of the industry leading dimensions and weights flange catalog. Version 5.0 is out. http://www.texasflange.com/images/Catalog/catalog-c.pdf
Free to download, save, and use. If you would like a hard copy please let us know and we will send you one, also free of charge.
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