Field weld symbol
Also called FW, Site weld, Field fit weld
A field weld is made on site, at installation, to join two spools or a spool to equipment. A field fit weld (FFW) has extra pipe left on so it can be cut to fit.
What the field weld symbol means
A field weld is made on site, at installation, to join two spools or a spool to equipment. A field fit weld (FFW) has extra pipe left on so it can be cut to fit.
How it is drawn
Drawn as a cross, an open circle or a dot labelled FW, depending on the project legend. FFW marks a field fit weld.
Isometric SVGWhere you see it
Spool to spool joints, tie-ins and closing welds where the final length is only known on site.
What is written next to it
On the isometric, the field weld usually carries a weld number and the FW or FFW mark.
What gets checked on site
For a field weld, the site checks usually cover fit-up, welding, visual inspection and NDT on site, then the pressure test of the line. 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 field weld symbol look like?
Drawn as a cross, an open circle or a dot labelled FW, depending on the project legend. FFW marks a field fit weld.
Where is a field weld used?
Spool to spool joints, tie-ins and closing welds where the final length is only known on site.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016