Copper pipe has good toughness and can withstand strong pressure. Under general conditions, the outer diameter of the copper pipe is 15mm, the wall thickness is 0.7mm, can bear 4.8mpa, that is, can bear 48kg pressure. This is why modern high-rise buildings will be copper pipe as the reason for the selection of pipe.
Mechanical properties of pipes, stainless steel pipes, ordinary steel pipes, galvanized steel pipes and other metal pipes can remain unchanged under the condition of water temperature change, so the pressure bearing capacity of metal pipes will not be reduced.
All kinds of metals do not have aging problems. In normal use, the part exposed to sunlight for a long time will not produce molecular structure changes due to exposure, nor will aging become brittle phenomenon. Problems to be grasped in copper pipe application design and construction
Determined by the above analysis of copper pipe characteristics, in the design and construction of copper pipe heating system, attention should be paid to the following aspects:
1) Understand the local heating water quality (pH value), so as to take appropriate measures to avoid unqualified water quality and affect the pipeline life;
2) to avoid copper pipe erosion, in terms of the entire pipeline loop system supporting facilities, shall be used for cast iron fittings or valves, unfavorable use steel pipe and other copper pipe and copper pipe, pipe fittings, accessories appropriate USES copper pipe, copper pipe connected to steel equipment, should be used in copper alloy parts (such as steel and copper flange, etc.);
3) Attention should be paid to the connection of pipes, such as the lead pipe, the outlet pipe and the water meter interface should be used to facilitate maintenance of the screw fittings or flange connection, not buried. Copper pipe buried part, buried pipe installation should adopt brazing welding method;
4) When the leading pipe passes through the basement wall or sub building wall, holes should be reserved. Pipe sleeves should be set for the holes temporarily opened to avoid damaging the surface of the pipe and affecting the service life. And should consider the building settlement and other adverse factors, the pipeline should not pass through the building settlement joint, expansion joint, such as through, should be set up the pipeline expansion and simple cut deformation compensation device;
5) When the pipeline passes through the floor and load-bearing wall, steel and plastic pipe sleeves should be set. The upper end of the pipe sleeve through the floor should be 50mm higher than the indoor ground level, the lower end is flat with the floor ground, and the pipe sleeve through the wall is flush with the walls on both sides;
6) Because of the high thermal conductivity of copper pipe, the Ming installed part of the heating pipe, in order to avoid injury, should use plastic coated copper pipe, plastic coating can both heat preservation and heat insulation, to ensure daily use.
7) In the process of construction, it is necessary to prevent acid and alkaline substances that can corrode the copper tube from contacting the copper tube. The solder or solder paste should not be used too much. After welding, the excess solder paste should be wiped off to avoid corrosion of the copper tube.
8) When the bent pipe is straightened, the copper pipe with an outer diameter less than 108mm can be adjusted by cold method, and the pipe with an outer diameter greater than 108mm should be adjusted by hot method. Check carefully after straightening, it is forbidden to use pipes with sag, cracking and damage.
