The Simple Pressure Vessels (Safety) Regulations 1991

Aluminium vessels

4.  Non-alloy aluminium must have an aluminium content of at least 99.5% and non-age hardening aluminium alloys must display adequate resistance to intercrystalline corrosion at the maximum working temperature. Moreover these materials must meet the following requirements:

(a) they must be supplied in an annealed state; and

(b) they must have the following mechanical properties per product:

• the maximum tensile strength must be no more than 350 N/mm and

• the elongation after rupture must be:

  • A – 16% if the test piece is taken parallel to the direction of rolling

  • A – 14% if the test piece is taken perpendicular to the direction of rolling.