About Hydrostatic Testing
By law all pressure cylinders have to be hydrostatically tested every 10 years.
Whilst it possible to remove the cylinders to empty them, hydrostatically test them , refill them and return them to site, APL would always try and arrange replacement cylinders to be delivered to the site.
APL would then change the cylinders over, removing the out of date ones, this would be more cost effective and mean less downtime without the protection of the system for the customer.
