Fiberglass acid tank overflow line

The fiberglass acid tank was out-of-service because it had just been washed. If the level in the acid tank was ever overfilled, the 4-inch (10 cm) overflow line would relieve into the adjacent chemical collection sewer. The sewer was scheduled for maintenance. As a precaution to protect the individuals assigned to repair the chemical collection sewer, an operations supervisor authorized the maintenance crew to blind the 4-inch (10 cm) overflow line. The operations supervisor provided instructions to the operators to limit the liquid level within the acid tank to a well-defined maximum. 

The fiberglass acid tank was out-of-service because it had just been washed. If the level in the acid tank was ever overfilled, the 4-inch (10 cm) overflow line would relieve into the adjacent chemical collection sewer. The sewer was scheduled for maintenance. 

Figure 7.16 A large fiberglass acid tank fails due to blinded vent line and blinded overflow line.

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See also in sourсe #XX -- [ ]

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