Care must be taken to completely seal entrance plugs (eg. at a manway) in refractory linings.
必须小心地完全封闭耐火材料衬里的进口门。
The seal ring consists of a heat insulation sleeve, a refractory fiber layer and a heat-resistant rubber layer, and is made into a sealed circular shape.
隔热套、耐火纤维层和耐热橡胶层组成，制成封闭环状密封圈。
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