Model No: 230
ERGIL Storagetech™’s Model 230 Thief Hatch offers protection against pressure and vacuum.
Within the cover are a static pressure seal, and a spring-loaded vacuum pallet and diaphragm assembly. The pressure and vacuum settings can be selected from a standard list.
As excessive pressure builds up in the storage tank or vessel the hinged hatch cover lifts, breaking the seal and allowing excess pressure to dissipate into the atmosphere. It closes under gravity when the pressure has returned to normal.
If the tank is subjected to negative pressure, the vacuum pallet and diaphragm assembly opens and allows air to be drawn into the vessel. The diaphragm closes when a positive pressure is established.
The unit must be installed on a flange at the top of the tank in the horizontal plane. It is possible to access the tank for gauging and sampling by fully opening the hatch.