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基本型内环金属缠绕垫有些密封件是安放在槽状的填料函中，这时需要紧配安装，施工时不可粗糙、野蛮，动作很大的强行装入势必破坏密封件原始预制结构，这就好比把预制混凝土打碎后填入所需部位必然导致灾难一样。对这类密封件安装必须十分小心、仔细，嵌入须逐次分步进行
基本型内环金属缠绕垫
下表是缠绕垫片直径公差（即用于法兰的名义管道直径）：
DIN (mm)ANSI B16.5
BS1560 (mm)
Mss sp-44API 605公差内环内径
垫片内径<=600<=24">=26" and <=34"±0.5>600 and <=800>24" and <=34">=36" and <=60"±0.9>800 and <=1600>34" and <=60" ±1.3>1600>60" ±1.6垫片外径<=600<=24"<=24"±0.9>600 and <=16000>24" and <=60">24" and <=60"±1.81600>60" ±2.2外环外径 >=1/2" and <=60"±0.9<=600<=24" 0-1.0>600 and <=1000>24" and <=34" 0-1.8>1000 and <=1600">34" and <=60 0-2.2
