Do not use an old PDF. The 2023 version harmonizes with international standards (ISO 15649, ASME B31.3) while retaining Australian-specific requirements like cyclone wind loading on above-ground piping.

t=PD2SaEM+Pt equals the fraction with numerator cap P cap D and denominator 2 cap S a cap E cap M plus cap P end-fraction : Internal design pressure. : Nominal outside diameter. : Allowable stress (the lesser of : Weld joint efficiency factor. : Piping class factor. Allowances The final nominal wall thickness must also include: Typically not less than 1 mm.

Based on the requirements of AS 4041, the following recommendations are made: