There is certain expansion clearance between different parts of boiler and one another which can prevent deformation of heated surface due to restrained expansion.
锅炉各部件及相互之间有一定的膨胀间隙，可防止受热面由于膨胀受约束而变形。
There is certain expansion clearance between different parts of boiler and one another which can prevent deformation of heated surface due to restrained expansion.
锅炉各部件及相互之间有一定的膨胀间隙，可防止受热面由于膨胀受约束而变形。
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