For a nitric acid storage tank (with a pressure of 5 Kpa), is it necessary to install a vent valve and a flame arrester on the tank? Should we consider the fire situation?
Thread Content
For a nitric acid storage tank (with a pressure of 5 Kpa), is it necessary to install a vent valve and a flame arrester on the tank? Should overpressure emergency release in case of a fire be considered? ? ? Such as installing an emergency relief manhole?
Why is a flame arrester needed? What can catch fire inside the storage tank?
:(Nitric acid can break down acidic gases; then what’s the point of using a breathing valve?)
None are needed, but attention should be paid to exhaust gas absorption.
However, the petrochemical regulations specify that storage tanks of categories A and B must be equipped with vent valves and flame arresters
No breather valve or flame arrester is needed; an vent on the top of the tank is sufficient. It is advisable to have a gas line connected to a fan, so that acid mist can be drawn away for treatment in the exhaust system when acid is poured into the tank.
If there is a vent, the tank won’t get deflated; the vent is placed on the top of the tank and angled downward to prevent rainwater from entering.
Should the venting go to the exhaust gas treatment device?
A water jet is sufficient; pay attention to the insertion depth of the material leg – a negative pressure cannot be created, as this could damage the tank or cause water to be drawn into the storage tank, both of which are serious accidents