Support

In general cylinders are classified by design, working pressure and content. By design cylinders are split into 5 types:

• Type I – all metal cylinders. Most of such cylinders are made of steel or aluminium.
• Type II – hoop wrapped metallic cylinder with fibre reinforcement of cylindrical part of a cylinder.  Such cylinders have slightly lower weigh than Type I cylinders.
• Type III – fully-wrapped composite cylinder with metal load-sharing liner. Both liner and composite shell share stress created by internal pressure.
• Type IV - fully-wrapped composite cylinder with metal or non-metal non load-sharing liner. Only composite shell takes all stresses created by internal pressure.
• Type V – Composite cylinder without inner liner. Composite shell serves as a barrier to prevent gases and liquids from permeation as well as takes all stresses created by internal pressure.

Composite cylinder is not a direct replacement of a steel cylinder, so the operator of cylinders has to consider market and it’s conditions where cylinders will be used. For sure you should opt for composite cylinder if you would like to increase attractiveness of your products to end customer by the following factors:

• light weight;
• attractive look;
• wide customization options;
• less maintenance costs;
• explosion proof in fire.

In order to choose the right volume of any LPG cylinder (steel or composite) the consumer has to decide how much of LPG he is going to distribute per one cylinder and which gas exactly it will be. Then required volume of cylinder can be calculated based on instructions given for cylinder filling in ADR document. Very often end customers in local markets are got used for several specific volume of cylinder and thus they expect to get same amount of gas as they get from similar steelcylinder. In this case cylinder volume has to be chosen based on market requirements. In all cases cylinder operator has to  make sure that the cylinders fit gas filling and distributing infrastructure by checking cylinder physical dimensions and stacking options.

Liquefied petroleum gases (LPG) have high thermal expansion ratio. It means that the volume of gas at 0C is much less than at 30C. For this reason the safety volume of gaseous phase has to be kept in each cylinder. This volume is calculated to cover the worst case scenario when LPG is filled at the lower end of operational temperature range and then cylinder brought to the upper end of operation temperature range. For proper filling cylinder operator has to use filling instructions given by ADR or local technical procedures which are usually very similar to ADR. Very roughly you can consider that maximum weight of Butane gas which can be filled into a cylinder in kilograms is half of a cylinder volume in litres. For example for 24L cylinder you can put there not more than 12kg of Butane. For less dense gases such as Propane and it’s mixtures with Butane this value will be less.

Our composite cylinders have several advantages among all other existing composite cylinders. The main one is that we use PET for the production of an inner liner, that’s why our composite cylinders have the lowest and the most consistent gas permeability among Type 4 composite cylinders available in the market, so the consumer will never feel the smell of gas, even indoors. While most of standards consider maximum allowed gas loss of approximately 9 grams per month for 24L cylinder, our cylinder has a loss below 1 gram over the same period of time.  Moreover, we offer the widest opportunities of customization, and our cylinders are compatible with all kinds of threads and valves.

Our cylinders are certified for unlimited lifetime.

Thanks to special chemical additives that are added to those parts that can accumulate static electricity, this problem has already been solved at the stage of cylinder production. In addition, we recommend spraying the cylinders or just a conveyer of a filling line with a simple water spray, which will provide additional protection against the possible accumulation of static electricity.