The comments made by Chakib Khelil, Algeria's energy minister, came as oil prices hit a historic peak close to $120 a barrel, putting further pressure on global economies.
It is the key study how to make sure the pressure distribution of liquid in the pump barrel and to study the pump valve-ball's movement to improve the systematic efficiency.
Welding joints must be certified before implementation of the welding process, thereby, the improvement of the welding process on barrel of pressure vessel is proved.