Orifice Flanges — Companion Article
Open the tool: https://pipingdesigners.com/tools-training/orifice-flanges/
What this tool does
Orifice Flanges looks up class 300 weld-neck and slip-on orifice flange dimensions.
When to use it
Use it to lay out a flow-measurement run and check space for the flange pair, jack screws and taps.
Inputs
- Flange type: weld neck or slip-on.
- Size.
- Units: inches or millimetres.
How it works
The page reads the Texas Flange catalog. Millimetres are those printed in it. A second chart checks the inch figures.
Understanding the result
Each dimension shows as a card. The weld-neck bore is left blank because the purchaser specifies it.
Engineering considerations
- Meter runs need straight pipe upstream and downstream. Check the instrument engineer’s requirement.
- Tap orientation matters on gas and liquid lines.
Example
NPS 2 weld neck: outside diameter 6.50 in, 165.1 mm.
Standards/references (licensed vs interim)
Licence status is interim. The numbers come from a manufacturer catalog, not from licensed ASME B16.36 text. The page builds its source note from the dataset and names the standard to verify against. Always check the current edition of ASME B16.36, or the manufacturer’s certified drawing, before you use a figure on a deliverable.
Limitations/disclaimer
- Class 300 only.
- No reducing or threaded orifice flanges.
- The result is preliminary and needs engineering review.
Use the tool
Calculate now: Orifice Flanges
Related tools
- The flange datasheet tool for flange dimensions. Read the flange datasheet companion article.
- Line Blanks (new tool, being added to the site).