U-1(j) describes those vessels that are exempt from inspection (versus examinations performed by the fabricator).
includes:
- vessels 5 cu ft or smaller and not subject to pressures more than 250 psi,
- vessels 3 cu ft or smaller and not subject to pressures more than 350 psi, or
- vessels 1.5 cu ft or smaller and not subject to pressures more than 600 psi.
Best regards - Al