Blind flange symbol
Also called Blind
A blind flange closes the end of a flanged line or nozzle. Unlike a cap, it can be removed.
What the blind flange symbol means
A blind flange closes the end of a flanged line or nozzle. Unlike a cap, it can be removed.
How it is drawn
Where you see it
Ends of lines that will be extended later, cleaning and inspection points, and test closures.
What is written next to it
On the isometric, the blind flange usually carries an item number, the size and rating.
What gets checked on site
For a blind flange, the site checks usually cover gasket and bolting, and whether the blind is permanent or only for the test. Each check is recorded against the line and the joint, so the line can go into its test pack and be handed over with its evidence. See the ITR guide.
Related symbols
Frequently asked questions
What does the blind flange symbol look like?
A flange line with a solid plate against it.
Where is a blind flange used?
Ends of lines that will be extended later, cleaning and inspection points, and test closures.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016