Many chemical and petroleum product complaints can be attributed to the way drummed products are stored. Care should be taken to keep water and all other contaminants out of drums by storing them in a way which prevents moist air or water from entering through the drum heads, particularly the bungs.
Even in covered storage, temperature changes can cause the drum to "breath"; the moisture in the air breathed into the drum can condense inside the drum. Drums in uncovered, outside storage may accumulate water on the heads which may be sucked into the drums by the same breathing action. Incredible as it seems, gallons of water can be drawn into a drum over a period of time through the tiniest pinhole of an opening. (see Figure 1)
