FIELD: machine building.
SUBSTANCE: invention refers to machine building, particularly to procedures of fabricating heat-hydro-insulated diminishing pieces and to designs of heat-hydro-insulated diminishing pieces proper. The procedure for fabricating set of heat-hydro-insulated pipe diminishing pieces consists in connecting diminishing piece with different diametre branches of working pipe for each pipe sub. Hydro-insulation is fabricated separately in form of a pipe-casing of a composed structure conditionally similar by shape to working pipe subs. Diminishing pieces of working pipes are centred. There are installed wires of on-line remote control system. The said hydro-insulation is conjugated with working pipe subs. Ends of hydro-insulation are sealed with process plugs. At least two-component foamed solidificated mixture is poured as a layer of heat insulation. Further mixture is conditioned; and process plugs are removed. Set of pipe diminishing pieces is fabricated within ranges of values of diametres of working pipe branches with smaller diametres from 25 to 230, preferably, from 39 to 219 mm and selectively correlating to them in ranges of diametres of working pipe branches with bigger diametres from 65 to 435, preferably, from 76 to 426 mm. Thus there are created combinations of from one to ten, preferably, to six of the latter with the same branch of the working pipe of smaller diametre. Also there is facilitated change of volume protection of working pipe with hydro-insulating material from 1.5 - 0.16 to 0.3-0.1. Here the first interval is ratio of specific volume of hydro-insulation to a unit of payload volume of a conditional running metre of a smaller diametre of a working pipe branch connected in a diminishing piece, while the second is the same for a branch of a bigger diametre, where change of volume protection of the working pipe with heat-insulating material is facilitated within 12.5-1.0 to 2.5-0.6. The first interval is ratio of specific volume of heat-insulation to a unit of payload volume of a conditional running metre of a smaller diametre of a working pipe branch connected in a diminishing piece, while the second is the same for a branch of a bigger diametre, where change of volume protection of the working pipe with heat-insulating material is facilitated within 12.5-1.0 to 2.5-0.6. The first interval is ratio of specific volume of heat-insulation to a unit of payload volume of a conditional running metre of a smaller diametre of a working pipe branch connected in a diminishing piece, while the second is the same for a branch of a bigger diametre. The complete set of items for the heat-hydro-insulated pipeline includes items each consisting of the working pipe or branches of the working pipe, of the layer of heat insulation and of external hydro-insulation. It also includes the set of pipe diminishing pieces Notably, each diminishing piece with hydro-insulation in form of the pipe-casing of complex structure conditionally identical to shape of the diminishing piece with diametre exceeding relative diametres of the said working pipe diminishing piece by thickness required and sufficient to the protective layer of heat insulation arranged underneath; also the layer is formed out of two-component foamed solidificated mixture of calculated density in the middle of the layer not less, than 60 kg/m3. The complete set is equipped with wires of the on-line remote control system.
EFFECT: facilitating versatility, process simplicity and efficiency of production.
24 cl, 16 dwg
