Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-12-16
1998-12-22
Sells, James
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156212, 156256, F16L 5914, F16L 5922
Patent
active
058513302
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of insulating a pipe wherein a tubular sheathing comprising an optionally radially slitted, tubular member of bonded mineral fibres oriented essentially in planes perpendicular to the longitudinal axis of the tubular member, and a sheet material, which by gluing is attached to the outer side of the tubular member, is mounted so as to envelop the pipe.
DK 157 627 B and 159 941 B disclose tubular sheathings of the above kind where the sheet material e.g. consists of a paper layer or a plastics or metal foil.
To facilitate the shaping of such a tubular sheathing around a pipe bend, the glue is applied in the form of essentially parallel, narrow stripes or rows of glue points, which stripes or rows extend substantially perpendicularly to the longitudinal axis of the tubular member.
In known tubular sheathings, the tubular member of mineral wool may be composed of a coaxial assembly of slitted insulation discs having a central hole.
According to a known method, cf. JP patent publication No. 6-137 485 , the assembly of discs is thus provided by sawing out from a stack of bonded mineral fiber sheets, whereafter the assembly thus obtained is enveloped in a sheet material e.g. of a corrugated metal foil.
The instant tubular sheathings are used for heat insulation of pipes for transport of hot or cold media, and in view of the handling as well as the mounting of the tubular sheathings on straight pipes it is important that they possess a certain rigidity.
Pipes of the above kind normally also comprise bends, e.g. 90.degree. bends, and in order to be able to insulate such bends effectively it is important that the tubular sheathings are bendable without formation of sharp elbows.
The improved bendability of tubular sheathings where the glue is applied in stripes extending essentially perpendicularly to the longitudinal axis of the tubular sheathings, has turned out to entail such reduction of the is significantly impaired. When such tubular sheathings are placed on end, they thus tend to collapse.
The method according to the invention is characterized in that the tubular sheathing, prior to being mounted on the pipe, is alternatingly compressed and stretched in axial direction in a zone in which the tubular sheathing is to insulate a bend on the pipe.
The invention is based on the discovery that such treatment of a tubular sheathing of the kind stated in the premable entails that the bonds between the mineral fibres and/or the bonds between the outer side of the tubular sheathing and the sheet material in the zone in question are changed in such a way that the tubular sheathing at the particular site becomes easily bendable, but otherwise retains its rigidity across the remaining portion of the length of the tubular sheathing. As a consequence of the fibres in the tubular sheathing used being oriented in planes perpendicular to the longitudinal axis of the tubular sheathing, the tubular sheathing possesses high resistance in radial direction, and even after having been treated in the way described the tubular sheathing continues to possess considerable resistance to such deformation in the particular area, and consequently satisfactory insulation of the pipe in the bend-area is still obtainable.
The invention thus offers the advantage that use can be made of tubular sheathings which, by appropriate selection of density for the tubular mineral fiber member, amount and kind of binder for bonding the mineral fibres and sheet material, have a desired rigidity with respect to handling, and concomitantly that when insulating bends such bendability is obtainable that a good insulation on bends on the pipe is easily obtainable.
Consequently, it suffices to use one type of tubular sheathing for insulating both straight pipes and pipe bends.
The tubular sheathings used in the method according to the invention are preferably composed of an assembly of annular, axially slitted discs, a particularly large bendability hereby being obtained following a treatment as described.
The preparatio
REFERENCES:
patent: 4205105 (1980-05-01), Blundell
patent: 4428991 (1984-01-01), Kampstrup-Larsen
patent: 4743329 (1988-05-01), Hata
patent: 5024249 (1991-06-01), Botsolas
patent: 5056564 (1991-10-01), Roth
Cridland Ian
Husbjerg Jens
rtoft Finn
Rockwool International A/S
Sells James
LandOfFree
Method of insulating a pipe with a tubular sheathing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of insulating a pipe with a tubular sheathing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of insulating a pipe with a tubular sheathing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2042123