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COLD VENT STACK - HELP

COLD VENT STACK - HELP

(OP)
Hi everyone,
I am writing from Italy and I'd like to have your opinion on a particular aspect of the Trans Adriatic Pipeline (TAP) that will transport gas via Greece and Albania and acrossthe Adriatic Sea to Italy’s southern Puglia Region and further to Western Europe. Crossing the Adriatic Sea from Central-Western Albania, the offshore pipeline gets onshore in South-East Italy and ties in to the Italian gas network South of Lecce.
The Pipeline Receiving Terminal will transport yearly 10 Bln Cubic meters of Gas in a first phase and lately it will double to 20 Bln. My doubts are, given the size and volumes involved, about the depressurization technology that will be used.
The depressurization of the station piping/equipment, both in emergency and in maintenance
condition, will happen through two dedicated vent stacks, to be installed within the
TAP Terminal. The cold vent stacks are designed to blow down the terminal piping and
equipment.
The vent stacks (10 m hight)are designed to blow down the entire volume between the
inlet- and outlet ESD valves from design pressure (145 barg) to 6.9 barg within approximately 15
min. The hold-up of the terminal is 48.6 Tons of Natural Gas (and will double when the Terminal will process 20 bln cubic meters of gas), that they say will be released ie for emergency or maintenance in the Air in 15 minutes. The Pipeline reciving terminal is respectively 800 meters and 1175 meters away from 2 towns with 7000 inhabitants each.
Does it make sense? I know already that few engineers have expresses profound doubts on this procedure.
what do you think?
Many thanks for your opinions in advance
Stefano

PS if that could help I could provide a comprehensive document via mail on request.Many Thanks

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