How to classify CE air tanks? A1, A2, G module.
In the previous article, we understand that CE air tanks are much more expensive than normal air tanks, and the CE air tanks are classified into different modules according to risk categories: A1,A2 and G.
During communication with the air tank factory, customers also need to understand the basic principle of the classification:
The categories are primarily based on two parameters:
Volume (V): measured in liters (L)
Maximum pressure (PS): measured in bar (bar)
If the air thank V*PS is less than 200, it belongs to A1 mode;
If the air tank V*PS is between 200-1000, it belongs to A1 category;
If over 1000, it comes to G mode.
For example, a 20L air tank with 8 bar pressure, it is CE A1 mode; for a 100L 8 bar air tank, it is CE A2 mode; if the same 100L but 12.5bar, it is CE G mode.
So what is the difference between A1, A2 and G modes?
A1 Module: Internal QC + Supervised Verification, for air tank mass production in PED Category II
In A1 module, the air tank manufacturer establishes and implements internal QC system. The Notified Body does not audit the entire quality system, but monitors the air tank manufacturer through sampling or individual inspection of manufactured air storage tanks, to verify conformity. This model is used for mass production of lower-risk air tanks, with a lower level of Notified Body involvement than in A2.
A2 Module: Internal QC+ Unscheduled Inspections,for air tank mass production in PED Category III
In A2 module, air tank manufacturers also establish and implement internal QC system, but Notified Bodies will conduct unannounced inspections and conduct necessary testing of air tanks in the manufacturer's warehouse or on the market. This uncertainty creates constant pressure on air tank manufacturers to ensure the same high quality standards with each batch. Notified Bodies provide stronger oversight than A1
G Module : Unit Verification
In this module,the Notified Body inspects and evaluates each individual air tank. All technical documentation for the tank is reviewed (design calculations, material certificates, process documentation, etc.). The Notified Body performs a final verification test (typically a hydrostatic test) on the air storage tank. Only after all inspection points are passed, the Notified Body issues the CE certificate for that specific product.
In summary:
If custom a large air tank for a specific project, choose the G model.
If mass-produce medium-risk air storage tanks, choose the A1 or A2 model.
A1 is for lower-risk Class II equipment and requires relatively standard oversight.
A2 is for higher-risk Class III equipment and requires more stringent oversight (Unscheduled inspections).
The module determines the certification process, cost, and timeframe, so besides the air tank itself cost, module choose is also a significant factor contributing to price differences for CE air tanks.
Do not hesitate to contact YCZX to know more information about CE air tanks.
