초록 ▼

In a pipeline system having a plurality of pipe segments joining a fluid supply tank to a fluid dispenser, the invention includes a pipe coupling assembly for use on at least one terminal end of a fluid transfer pipe, where the transfer pipe has an inner tubular member for transferring fluid and an

In a pipeline system having a plurality of pipe segments joining a fluid supply tank to a fluid dispenser, the invention includes a pipe coupling assembly for use on at least one terminal end of a fluid transfer pipe, where the transfer pipe has an inner tubular member for transferring fluid and an outer tubular member and an interstitial space therebetween. The coupling assembly comprises a transition coupling for attachment to the pipe segment to provide a first path for the fluid in the inner tubular member and a second path for the interstitial space. The coupling assembly further comprises a transition fitting for attachment to the transition coupling to provide separate paths for the transfer fluid and the interstitial space, where the interstitial space provides a means for performing leak detection or fitting integrity tests during application of either a vacuum condition or pressurized gas input via such selective access.

대표청구항 ▼

[ I claim:] [1.] A pipe coupling assembly for double-wall pipe having an interstitial space between an inner pipe and an outer pipe, said coupling assembly joining a terminal end of the double-walled pipe with a transition fitting, said coupling assembly comprising:a transition fitting;a hollow inse

[ I claim:] [1.] A pipe coupling assembly for double-wall pipe having an interstitial space between an inner pipe and an outer pipe, said coupling assembly joining a terminal end of the double-walled pipe with a transition fitting, said coupling assembly comprising:a transition fitting;a hollow insert for placement within the inner pipe at its terminal end, said insert comprising a main body portion with saw teeth on a portion of its exterior and a sleeve portion, said saw teeth fixedly engaging the inner surface of the inner pipe when the main body of the insert is placed within the pipe, said sleeve portion protruding from the terminal end of the inner pipe, said sleeve portion comprising at least one groove in its exterior surface that extends around the sleeve, said groove having an O-ring disposed within it for sealing engagement with the fitting;a transition coupling installed on the terminal end of the double-walled pipe, said transition coupling comprising a ferrule and a swivel nut,said ferrule having a stepped internal configuration comprising a first and second interior bore, said first interior bore having teeth on its interior surface for engaging the terminal end of the outer pipe on its exterior surface, said second interior bore of said ferrule having teeth on its interior surface for engaging the inner pipe on its exterior surface, said ferrule further comprising interstitial channels for communication with the interstitial space between the inner and outer pipes,said ferrule further comprising a circumferentially extending shoulder and a retention rib on its exterior, said shoulder and rib defining a space between them for locating and retaining the swivel nut, said shoulder having an O-ring retention slot with an O-ring disposed in the slot for sealing engagement with the fitting,said swivel nut having a shoulder disposed between the ferrule shoulder and the retention rib, and a threaded interior surface for engaging the fitting.