I have spent myself a fews year working for Sonatrach at Skikda ( 90-92/3).
ASME VIII is the Code there.
For piping ANSI B31.3 (within the plots)
For tanks : mainly API 650 , have also seen API 620 for LNG tanks.
The algerian have their one seismic Code.
French code CODAP and are also refered to.
Also for line classification ( services des mines).
I believe and I have heard that the PED will be used.??