Luxfer Cylinders

Divetek – Exclusive distribution agents for Southern Africa

About Luxfer Aluminum Cylinders

In 1988, Luxfer introduced scuba tanks manufactured from L6X, a proprietary formula of aluminum alloy 6061-T6 developed by Luxfer metallurgists to provide superior corrosion-resistance and dependable performance in the most demanding underwater environments. The manufacturing of Luxfer scuba cylinders has been relocated to the Graham, North Carolina factory. The original tooling is being used to maintain the same specifications, buoyancy and weight distribution. Proprietary L6X 6061-T6 aluminum alloy which has an unsurpassed record for safety and dependability will continue to be used. Luxfer is the preferred choice by military, commercial and technical divers worldwide.

Aluminum cylinders unlike steel cylinders don’t rust, they oxidize. The oxidization of aluminum forms a protective coat that hinders the continuation of corrosion making aluminum cylinders less likely to be condemned due to excessive corrosion. When shipped the tanks valves will be removed and the tank will require re-inspection before being filled.

Neutral Buoyancy Cylinders
Divetek has worked with Luxfer in the UK to design neutral buoyancy cylinders.
The Standard American S80 (11.2 ltr) cylinder that is ubiquitous around the world is a horrible cylinder.
Its too long and only 207 Bar and it floats at the start of a dive so by the end of the dive it lifts your bum up.
The cylinders become lighter as you use up the air. The amount depends on the size, the smaller the cylinder the less the change, but the range is 2 to 3 kg.
What is a neutrally buoyant cylinder?
Depending on the size, you want a full cylinder to sink by about 1 kg at the start of the dive. Bigger cylinders you want a bit heavier as there will be a bigger change.
These are neutral, the Luxfer cylinders have been designed with extra thickness in the base to get this perfect buoyancy.
Steel cylinders are way too negative and constantly try and roll you over, you get used to this and dive with wide legs to counter this. The cost in air consumption is high.
Divetek strongly recommends diving with Luxfer neutral cylinders rather than steel.
There are many advantages including they do not rust and last far longer than steel.

7L 232Bar

10.4L 232Bar

12.2L 232Bar

Typical markings for a SCUBA cylinder

  1. M25 x 2 = Thread Specification – Important to ensure the correct valve is used with your cylinder.
  2. UK = Country of Manufacture
  3. LUXFER = Cylinder Manufacturer
  4. P3173V….= Cylinder Type Number and Serial Number – This number is recorded by Luxfer which means, if ever necessary, the entire manufacturing history of your cylinder can be traced.
  5. AA6061 T6 = Alloy of Construction
  6. 11,6MM = Design Minimum Wall Thickness.
  7. 9,8KG = Empty Weight of Cylinder Only (kg)
  8. 7L = Minimum Water Capacity (litres)
  9. PW 232 BAR = (Working Pressure) – Shows the pressure that the cylinder should be filled to – this must not be exceeded.
  10. PT 348 BAR = (Test Pressure) – Shows the pressure that the cylinder should be tested to – this must not be exceeded.
  11. PS 287 BAR AT 60°C = (Service Pressure) – Shows the maximum service pressure and operating temperature for which the cylinder design is approved. This must not be confused with the working pressure (9).
  12. This is the mark of Conformity and Notified Body Reference Number according to the Pressure Equipment Directive 97/23/EC.
  13. 2002/ 2 = (Test Date) – Year and Quarter of year of initial test.