Copper Industries manufacture our copper cylinders in the 3 grades described in BS 1566; Grade 1, Grade 2 and Grade 3. The cylinders are graded depending on the thickness of material used to cope with different operating conditions. Grade 3 cylinders are made from 0.7 – 1.2 mm thick copper and are designed to cope with a maximum working head of 10 metres.
Copper Industries only recommend this grade of cylinder operating within the stated parameters and connected to a reservoir or similar high quality water supply. Grade 2 cylinders are slightly thicker (0.9 – 1.4 mm) and are designed to work with a maximum working head of 15 metres. A Grade 2 cylinder would be recommended for most vented installations.
Finally, Grade 1 cylinders have the highest material thickness (1.2 – 2.0 mm) and are designed to work with pressurized systems which have a maximum working head of up to and including 25 metres. Sacrificial anodes are also available for hard water areas.
CAUTION: not all cylinder manufacturers classify their cylinders in the same way. If in doubt contact us directly.