This invention relates to an arrangement for sealing a closed chamber in which equipment is to be replaced and especially to a chamber in which equipment is to be replaced while the chamber is to be maintained closed. The arrangement includes a channel filled with a fluid, such as water, and a skirt...http://www.google.com.au/patents/US6101698?utm_source=gb-gplus-sharePatent US6101698 - Arrangement for sealing a closed production system
