The Unprofitable Result of Hydraulic Couplings Being Used in Series-Pumps for Delivering Hot Crude Oil

It can be seen through analysis and calculation of the effect of hydraulic couplings being applied to crosscountry hot crude oil pipelines that hydraulic coupling is not any more economical in comparison with throttling valves in flow control.But the use of backfeed control of high efficient controlable silion or the DC motor-AC generater, and or the adjustment of syncronous motors is feasible in economy.