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。
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。
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。
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