Drums are nearly 3mm thick-wall if it is plastic(special grade of export material like Haldia Plastic). It is not intended to be pressure vessels. Though, in some of the industrial applications, they are required controlled to pressure forces both internal and external. But in a few cases, the pressures exerted are within the tolerances acceptable for that product. When the pressure used on the drums are outside the acceptable tolerance ranges, a distortion may be observed in the outer surface of the drums. This phenomenon is usually referred to as paneling
Problems of Container Panelling
1. Variations in the temperature
2. Penetration of the product into the wall of the container
3. Storage of an oxygen scavenger product in the drum
4. Variations in atmospheric pressure conditions
A drum panel because the pressure generated inside of the drum has become significantly less than the pressure outside the drum. The above reasons for the paneling of drums have this same effect – It can change the pressure differential over the drum.
The question is, ‘how much pressure difference is required?’
The results of the following answer are case by case of the Panelling Test for Plastic drums.
The paneling of the drum has a solution. If a temperature variation is causing the issue, use the results given in the paneling test to get a maximum temperature range for your drum and either allow sufficient time for the product to cool down to an acceptable temperature or utilize plugs with venting systems in your drums.
If you assume a compatibility problem between your product and drum, contact your supplier and ask for the compatible material or grade of HDPE material.
If facing an issue of oxygen scavenging is easily solved by placing a space filled with nitrogen gas/inert gas over the product that is packaged.