1. Ma mmanụ na gas lubrication usoro bụ nke mejupụtara mmanụ ọkụ eletriki;
2. ini ọma na mmanụ mmanụ mmanụ;
3. Acdị nhazi nhazi nke pneumatic na akụrụngwa njikwa.
4. Ogwe mmanụ na gas lubrication bụ mmiri mmiri na-emekarị.
5.Suitiable maka spiding dị elu ma ọ bụ mmanụ ọzọ na mmanụ.