i usually insert pressure as barg (gauge), not as bara (absolute).

now i have a line having a light vacuum inside: 7,0 mbara.

what value have i to insert? if atmospheric pressure is 1bar, then i should insert -0.993 bara?

does caesar accept negative pressure? if yes, having an axial expansion joint without tie rods, will caesar consider pressure forces that will try to "close" the expansion joint (usually positive pressure try to "open" it)?