In some instances the reinforcement can be achieved using small aluminum tube as bushing.
在一些例中钢筋能被达成以小的铝管作为桥衬。
2
A kind of heating technology of directly heating crude oil in the oil tube by the oil tube and bushing is developed.
提出了一种利用油管和套管作为发热体直接加热油管内原油的方法。
3
Electric power is output to the oil tube, which is connected with the bushing by the oil bushing connecter on the bottom of the oil tube, via a 3-phase transformer after AC-DC-AC inverse circuit.
电能由三相配电变压器经AC DC AC逆变电路输出传送到油管，经油管下部的油套管接触器连接到套管，形成一个完整的回路。