Pipes of systems of water heating are intended for giving in devices and tap from them necessary quantity of the heat-carrier therefore them name heat conductors.
Heat conductors of vertical systems of heating are subdivided into highways, struts and podvodki. Heat conductors of horizontal systems, except highways, struts and supplies, have horizontal branches.
Depending on a place of a lining of highways distinguish systems with the top distributing (fig. 43 when submitting (planting the heat-carrier) the highway (Т1) is located above heating devices; with the bottom distributing (fig. 43 6, fig. 44) when and submitting (Т1) and return (Т2) highways are laid below devices. At water heating there are still systems with "юяЁюъшэѕ=ющ" water circulation (fig. 44) when the submitting highway (Т1) is more low, and return (Т2) above heating devices.
For the heat-carrier admission steel pipes are used, as a rule, shovnye (welded) and seamless (seamless) are more rare. Steel pipes make of a soft carbonaceous steel that facilitates performance of bends, carvings on pipes and various assembly operations. Wide application of steel pipes in heating systems explain their durability, simplicity and reliability of welded connections, conformity of factor of linear expansion became factor of expansion of concrete that is important at zadelke pipes in concrete (for example, in concrete panel radiators).
a Fig. 43. Heat conductors of vertical systems of a central heating is shown
And - with the top distributing; - with the bottom distributing; in - with "юяЁюъшэѕ=ющ" water circulation;
1 and 2 - submitting (Т1) and the return (Т2) highways; 3 both 4 - submitting and return struts; 5 both 6 - submitting and return podvodki; 7 - heating devices: (arrows the direction of movement of the heat-carrier)
a Fig. 44. Heat conductors of horizontal systems of water heating
And - with the bottom distributing; - with the top distributing;
1 and 2 - submitting (Т1) and the return (Т2) highways; 3 both 4 - submitting and return struts; 5 both 6 - submitting and return podvodki; 7 - heating devices (arrows the direction of movement of the heat-carrier is shown); 8 - one-trumpet branches; 9 - bifiljarnye branches
In systems of water heating use the neozinced (black) welded water gas pipes - depending on a thickness of a wall of a pipe are subdivided on ordinary, strengthened and lungs.
In tab. 27 the assortment of pipes is resulted. Ordinary and easy pipes are most common for heating. In a symbol specify figure of conditional pass (Du 20). Steel electrowelded and seamless seamless pipes let out with walls of a various thickness, therefore in a symbol it is necessary to specify external diameter and a thickness of a wall, for example 76x3 mm. The assortment of steel pipes is resulted in tab. 28, 29, 30.