/ pipe can be crafted with the following recipes

Autolearned
Player Recipe
Primary skill used: fabrication(4)
Required skills: N/A
Time to complete: 120 minutes
Tools required:
> 1 tool with anvil quality of 3
> 1 tool with hammering quality of 3
> hotcut
> electric forge (40 charges) OR acetylene torch (40 charges) OR electric arc furnace (20 charges) OR charcoal forge (40 charges) OR basecamp forge (40 charges) OR demon forge (40 charges) OR rock forge (40 charges)
> metal fileset OR pair of flatjaw tongs
Components required:
> 2x chunk of steel OR 10x scrap metal
Byproducts:
(none)

Cannot Be Memorized
NPC Recipe
Primary skill used: fabrication(4)
Required skills: N/A
Time to complete: 12 minutes
Tools required:
> 1 tool with anvil quality of 3
> 1 tool with hammering quality of 5
> pair of metal tongs
> swage and die set
> electric forge (10 charges) OR acetylene torch (2 charges) OR charcoal forge (10 charges) OR basecamp forge (10 charges) OR demon forge (10 charges) OR rock forge (10 charges)
Components required:
> 7x scrap metal
Byproducts:
(none)