| 摘要 |
A tapping sleeve or service clamp has first and second semi-cylindrical sleeve members that fit around a pipe having a side opening, one sleeve member with a fixed side branch which is aligned with said opening. The sleeve member has lug members at opposite ends which are drawn together by bolts. The sleeve member with the side branch has a first inner liner gasket having end portions extending well beyond its straight end edges that are fully tapered to a feather edge and armour strips that located under the lugs when the sleeve members are around the pipe. A second inner liner gasket is provided for the second sleeve member and has tapered end portions that terminate at opposite straight end edges of the second sleeve member with a substantial thickness only somewhat less than the nominal thickness of the second gasket. As the bolts are tightened to draw the lugs together in tightening the sleeve members on a pipe, the tapered gasket portions under the ends of the second sleeve member bear against the armour strips to provide increase sealing power.
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