Weights and Dimensions
Which standard governs which number, and where to find the live tables.
Copper alloy flanges are normally made to a steel dimensional pattern in a non-steel material. That split is the thing to keep straight when you are reading dimensions and ratings.
The physical dimensions, outside diameter, bolt circle, hole count and hole size, thickness and hub geometry, come from the dimensional standard. For most copper alloy flange work that is ASME B16.5, or ASME B16.24 where a cast copper alloy pattern is called for.
The pressure-temperature rating does not come from those tables. The B16.5 rating tables are computed for steel. A flange machined to a B16.5 pattern from C70600 has the geometry of a Class 150 flange and the strength of copper-nickel, which is a different and lower number. The rating has to be worked from the design code, ASME B31.3 for process piping, using the certified allowable stress for the actual alloy at the actual temperature.
Copper alloys also derate steeply with temperature compared with steel, so a rating that is comfortable at ambient can be marginal at 300 degrees F. Send us the design conditions rather than just the class, and we will tell you whether the alloy and thickness carry it.
The standards that matter
| Standard | Scope |
|---|---|
ASME B16.5 | Steel pipe flanges and flanged fittings, NPS 1/2 through 24 |
ASME B16.47 | Large diameter steel flanges, NPS 26 through 60, Series A and Series B |
ASME B16.20 | Metallic gaskets for pipe flanges, including ring joint, spiral wound and jacketed |
ASME B16.24 | Cast copper alloy pipe flanges and flanged fittings |
ASME B16.1 | Gray iron pipe flanges and flanged fittings |
AWWA C207 | Steel pipe flanges for waterworks service, Class B, D, E and F |
MSS SP-44 | Steel pipeline flanges, the origin of B16.47 Series A |
API 6A | Wellhead and christmas tree equipment, including 6B and 6BX ring groove flanges |
ASME B31.3 | Process piping. The design code that turns material allowables into a rating |
Pressure classes we supply
75, 125, 150, 175, 250, 300, 350, 400, 600, 900, 1500 and 2500, plus API 5K, 10K, 15K and 20K. High yield and low temperature grades are available across the range.
On weights
Published flange weights are nominal. They are calculated from the standard geometry at a nominal density and they do not account for machining allowance, the actual bore, the facing, or the specific gravity of the alloy you are ordering. For rigging, shipping and structural support, ask us for the calculated weight of the actual part rather than working from a table.
This matters more than it sounds at the large end. A flange that a table calls 900 pounds can land meaningfully off that once the real bore and facing are accounted for, and rigging plans do not like surprises.
This page is orientation, not a dimension table. Live dimensional tables for the steel patterns we machine copper alloy flanges to are maintained on the Texas Flange site. The governing document is always the current edition of the applicable standard. Confirm any dimension against the standard, or with us, before fabrication.
Texas Flange dimensional tables · Request a dimensioned drawing
Need the real weight or a verified dimension?
Send the print, or send the size, class and grade. Texas Flange quotes quickly.
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