Anchor system for pre-insulated piping
An anchor system is shown for use with a pre-insulated piping system having an inner steel carrier pipe surrounded by a layer of insulation and then by an outer protective jacket. The anchor system includes an inner carrier pipe for insertion within the length of the piping system at a selected point. A steel anchor sleeve surrounds a portion of the length of carrier pipe and insulation. It terminates at one end at an outwardly flaring anchor plate which is subsequently embedded within a concrete anchor block. A steel end cap is welded to a second, opposite end of the sleeve and to the inner carrier pipe at a point along the length of piping which is outside the concrete anchor block and which is spaced apart from the location of the anchor plate, whereby heat from the high temperature fluids in the piping is transferred to the end cap at a location along the length of piping which is distant from the location of the anchor plate.
1. A bonded foam pre-insulated piping system of the type used for conveying high temperature fluids, comprising:
a length of insulated and jacketed pre-insulated piping, the length of piping comprising an inner metal carrier pipe having an interior surface and an exterior surface, an envelope of bonded foam insulation surrounding the inner pipe exterior surface, and an outer thermoplastic protective jacket surrounding the envelope of bonded foam insulation, the envelope of bonded foam insulation being bonded to the inner metal carrier pipe exterior surface and to the outer thermoplastic protective jacket, the length of piping having a joining end for joining to an adjacent length of piping, whereby the adjacent lengths of piping provide a continuous length of fluid conduit for conveying high temperature fluids;
an anchor installation located at a selected point along the length of the piping system, the anchor installation including an inner metal carrier pipe for joining to the joining end of an adjacent length of piping in the piping system, the carrier pipe being surrounded by an envelope of bonded foam insulation, and wherein a special metal anchor sleeve surrounds at least a portion of the length of inner metal carrier pipe and bonded foam insulation, the anchor sleeve having a cylindrical length which terminates at a first end at an outwardly flaring anchor plate which is subsequently embedded within a concrete anchor block, the sleeve also having an opposite, second end, the sleeve being arranged to surround the envelope of bonded foam insulation in spaced apart relationship to the inner metal carrier pipe and extend outwardly from the concrete anchor block along the length of piping for a predetermined distance; and
a metal end cap which joins the anchor sleeve at the second end thereof to the metal inner carrier pipe at a predetermined point along the length of piping which is outside the concrete anchor block and which is spaced apart from the location of the anchor plate, the predetermined point where the metal end cap joins the inner metal carrier pipe being selected so that heat from the high temperature fluids in the piping is transferred to the metal end cap at a location along the length of piping which is outside the concrete anchor block and spaced away from the anchor plate, the end cap being the only point of metal contact between the anchor plate and its associated metal anchor sleeve and the inner metal carrier pipe.
2. The pre-insulated piping system of claim 1 , wherein the inner metal carrier pipe has an opposite end which extends from the anchor block in an opposite direction from anchor sleeve, the opposite end of the inner metal carrier pipe being surrounded by a layer of bonded foam insulation and then by an outer thermoplastic protective jacket, the outer thermoplastic protective jacket, in turn, being surrounded by a cylindrical watershed ring which is joined to the anchor plate and which surrounds and is joined to the outer thermoplastic protective jacket at each of two opposite extents thereof.
3. The pre-insulated piping system of claim 2 , wherein the watershed ring is formed of metal and the outer thermoplastic protective jacket is formed of a synthetic polyolefin material, and wherein the watershed ring is joined to the outer thermoplastic protective jacket by a sleeve of heat shrink material.
4. The pre-insulated piping system of claim 3 , wherein the foam insulation is selected from the group consisting of polyurethane foams and high temperature polyisocyanurate foams.
5. The pre-insulated piping system of claim 4 , wherein the lengths of insulated piping are part of a pipeline conveying steam, hot water or other hot fluids at a temperature above about 212° F.