Hello,
I have this little odd question regarding storage tanks.
This is a storage tank used to store contaminated water (oily). The tank is fitted witha vent and a flame arrestor. However it has been observed that the flame arrestors were got blocked because of ice formation during winter conditions resulting in atleas one tank damage incident in the past.
Hence it was proposed to install PVSVs on the tank to cater for inbreathing requirements.
Later on an overflow line has been proposed to address possible overfill scenarios. The overflow connection is connected to the open drain collection system that runs to API separator. A typical overflow line routed to open funnel has been proposed.
My question is can the overflow connection also can be used as another vent that negates need of a PVSV? I have always seen tanks fitted with both overflow line and PVSVs both. But in theory overflow line should be able to assist the venting requirments?