8900 Series
Manway Emergency Relief Vents
OBJECTIVE
The 8900 Series manway pressure
and pressure /vacuum relief vents provide emergency pressure relief beyond that
furnished by the normal pressure vent for atmospheric and low pressure tanks,
as well as a convenient access for tank cleaning, inspection and repair.
Emergency relief vents provide relief from excessive internal pressure which
may be caused by an abnormal condition; such as ruptured internal heating coils,
an external fi re, a failure of the tank blanketing system, a sudden cooling of
the tank or a break in the tank wall.
TECHNIQUE
The pressure pallet assembly
provides an effective vapor-tight seal when the tank is not under emergency conditions.
If the tank out breathing requirements exceeds the capability of the normal
pressure relief vent, under emergency conditions, the pallet assembly lifts off
the seat to allow escape of vapors, preventing damage to the tank due to excess
pressure. When the excess pressure is relieved the pallet assembly will reseat
to again provide a vapor-tight seal.
BODY SIZE: 16", 18", 20", 24"
MODEL 8900 EMERGENCY VENTS