At Ted Louis-Hydrostatics the cylinder passes all the previous inspections it is ready to be hydrostatically tested, when it is filled with water and connected to the test panel. The cylinder is pressurised to fill pressure twice to check accuracy of the panel and remove air bubbles from the system.
The cylinder is then pressurised to its test pressure and held there for one minute. The pressure is slowly released and the expansion measured on a manometer tube. The maximum allowed expansion is the water capacity of the cylinder in kilograms divided by five.
The cylinder is disconnected from the test panel and inverted to drain after which it is dried using warm air. After a final internal inspection to ensure proper drying the neck "o"ring is replaced and the valve installed.
The cylinder is then stamped and test certificate completed. Failed cylinders are destroyed in accordance with the standard.
“Fully wrapped carbon fiber cylinders should be tested every five years and have a 15-year service life.”
Australian Standard (AS2030.5) require that your scuba diving tank be visually inspected and pressure tested at a certified testing station once per year.
At Ted Louis-Hydrostatics an external inspection is carried out looking for damage or alterations that may include gouges, dents or corrosion. Special attention is paid to repainted cylinders as they may have been heat treated or had dents and gouges filled. To carry out this inspection thoroughly the cylinder boot and mesh are removed. Dents, gouges, corrosion or heat treating can all effect the integrity of this high pressure vessel and they can fail test as a result.
The cylinder is then drained and the valve removed,. If in the opinion of the operator the valve requires to be serviced it will usually be serviced at an additional cost. The neck thread and internal space is checked for corrosion, wear, pitting or rust.
Older aluminum cylinders often fail in this area as the neck thread may have corroded or worn beyond the allowed tolerance, this is an automatic failure under the standard. Aluminum cylinders can also be badly corroded internally especially if salt water has entered the cylinder.
Steel cylinders as we all know can be subject to rust, some brands more than others due to the amount of carbon used in the steel when manufactured.
It needs to be pointed out that rust in steel cylinders is usually a result of carelessness by its user or your fill station. If your cylinder has been filled with moist air from a station that has not been maintaining its filters or compressor adequately rust will occur, oil may also be found if this is the case.
Cylinders found to be rusty or corroded internally and are not beyond repair are brushed using various forms of wire brush attached to a long shaft driven by an electric drill. The residue is cleaned out and rumbling chips inserted into the cylinder, it is then placed on a rumbler that rotates the cylinder at about 90 to 100 rpm for up to eight hours depending on the severity of the corrosion. The cylinder is then filled with water and inverted to assist in removing the chips. It is then cleaned, dried and internally inspected.
This time consuming process removes remaining corrosion and polishes the internal cylinder wall and is an additional cost.
At Ted Louis-Hydrostatics, we are able to restore your cylinders back to health internal and external,that exceed the Australian standards, no matter the size of the cylinder.
We specialize in repainting both Scuba and composite wrapped cylinders, to the highest standards, colour to suit your needs.
The workshop meets all relevant ISO Quality Management System, and paints to relevant Australian Standards. After Blasting, or sanding, and preparation the technician will determine and choose the appropriate paint to use to coat the cylinder . We are united by our shared values and our commitment to onsite and in-house safety, quality and professionalism.
All utmost care is used to get cylinders, back to new condition. We are Australian owned company which will deliver innovative and cost effective solutions to any cylinder surface treatments. Services Include: