Dear Sir
When I have reviewed PSV shown on P&ID, discharge line of PSV has been specified with note that it shall be 10 feet far away from equipment in case of releasing to ATM.
On the other hand, Pressure/ Vacuum Vent Valve at atmospheric tank is always specified to release to ATM, also. I was wondering why 10 feet far away from equipment will not be applied for.
Could you please give me the advice or more explanations or reference?