Thief Hatch

The thief hatch enables continuous operation by releasing vapor to maintain an optimal pressure in fibreglass and lined steel tanks. Sudden separation of the thief hatch lid from its base can generate a static discharge if the lid and base are inadequately bonded and grounded.

A static discharge could also occur when a pumper opens the thief hatch for maintenance operations, resulting in physical injuries.

Grounding the thief hatch assembly minimizes the risk of static accumulation. Fire and injuries can be prevented by adequate bonding and grounding of the thief hatch lid and base.

There are two key functions that must be in place for safe function of the thief hatch. When the two key functions are met, only then will any static generated on it safely transfer to ground, eliminating static electricity as a potential source of ignition and injury.

• Verify that a flexible bonding strap is installed between the lid and base
• Verify that the base is bonded to the grounded trunk line