Fastener for closing and sealing ends of pipes subjected to internal pressure
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United States of America Patent
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-
Mar 20, 1990
Grant Date -
N/A
app pub date -
May 24, 1988
filing date -
May 29, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fastener for closing and sealing pipe ends subjected to internal pressure is applicable for testing plastic pipe for internal pressure resistance. Testing is carried out in apparatuses in which a pipe section is filled with water and then pressure is applied, its value corresponding with desired tension in the pipe wall. In the fastener of the invention forces exerting clamping pressure of fastener elements on pipe ends are derived from internal pressure within the pipe, allowing for disengagement of external supply during hours of testing on the one hand, and on the other hand ensuing proper proportion between this pressure and the forces clamping the fastener elements on pipe end.
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