Frac unit RR1500 resumed by Jereh Company has been put into use in Qinghai Oilfield. This model of frac units, produced by American Western Company, were integrated with advanced electrical control system, pneumatic control systems, hydraulic systems and manufacturing technologies. It is the key equipment to increase the production. This Frac unit RR1500 was crashed down from the hill road of Nanyi Mountain in Qinghai Province in July, 2000. The entire truck was severely damaged, nearly discarded. This successful resumption of this frac unit is a mark that the maintenance level of Jereh has reached the advanced international standards and we have the confidence of providing the most excellent service to the domestic customers.