| 摘要 |
<p>A fire stop collar assembly comprises a plastics sleeve (2) which fits over a plastics pipe. An annular collar (4) of intumescent material is supported by the external surface of the sleeve (2). A tension spring (8) is held under tension on an end of the sleeve (2), with a sheath of refractory fabric (6) being interposed between the spring (8) and the sleeve (2). Upon softening of the pipe and sleeve (2) in the event of a fire, the spring (8) will act to constrict the sleeve and the pipe within the refractory sheath.</p> |
