It is about the ring screw thread smoke channel of the boiler shell type gas tube in the boiler field.

锅壳式烟管锅炉烟管内置水管的环形螺纹烟道，它涉及锅炉领域。

youdao

Screw the fixing ring nuts back on.

拧紧背面的固定环型螺帽。

youdao

Screw lock ring heat exchangers as main equipments are used in hydrogenation cracking plant which have many shortcomings.

传统的加氢裂化装置主要换热器采用的是螺纹锁紧环式换热器，存在许多缺点。

youdao

The economists warned that ring-fencing some areas would "turn the screw" on every other sector that did not benefit from that concession.

BBC: Study warns of 'age of austerity'