Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – With protection or indication of pipe or trench
Patent
1991-06-17
1992-09-08
Reese, Randolph A.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
With protection or indication of pipe or trench
405154, 285381, 156 86, 138 96T, B65D 5906
Patent
active
051452839
ABSTRACT:
For gasketing slip joint applications, a method is disclosed for clean pipe laying involving shrink wrapping the bells and spigots of pipes and conduits prior to their installation in the field and circumferentially cutting an aperture in the shrink wrap at the end of the pipe to permit insertion of the end of a mating pipe. The above procedure provides a clean environment so that contaminants do not enter the pipe and eliminates the cleaning step normally necessary when joining or connecting water, sewer, or drainage pipe in an excavated trench. In the case of water, sewer, or drainage pipe, the O-ring seal of the bell is lubricated and then this end of the pipe is shrink wrapped, as is the mating tapered pipe to be inserted into the bell. The shrink wrap prevents contaminants from the excavation or otherwise from entering into either of the pipes to be joined, thereby eliminating joint failure due to contamination during installation as well as pipeline contamination in general. In one embodiment, a precut piece of heat shrinkable plastic material is positioned over the end of the pipe and secured to the end of the pipe such that when heated the shrink wrap closes tightly around the end of the pipe or spigot. Additonally, the shrink wrap material is provided in bag form with a pulltie so as to locate and secure the bag over the pipe during the heating process. Additionally, a pulltag incorporated into the bag facilitates removal of the plastic from the bell or spigot through pulling of the tag which severs the shrink wrap along a score line so that it may be removed.
REFERENCES:
patent: 2371913 (1945-03-01), Phillips
patent: 3078879 (1963-02-01), Mallard
patent: 3226807 (1966-07-01), Orr
patent: 3412524 (1968-11-01), Nestell et al.
patent: 3587654 (1971-06-01), Yocum
patent: 4300328 (1981-11-01), Carlsen
patent: 4757595 (1988-07-01), Fraering
Olsen Arlen L.
Reese Randolph A.
Tendler Robert K.
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