Application of Large Diameter LSAW Pipe in Thermal Pipeline

LSAW pipe for heating is the conduit for transporting steam or hot water and other thermal media. LSAW pipe for heating is characterized by high temperature medium, high pressure, high flow rate, will bring greater expansion and impact on the pipeline. Therefore, in the pipe installation should solve the pipe material, pipe expansion compensation, pipe hanger, pipe slope and drainage, deflation device and other issues to ensure the safe operation of the pipeline. Pipeline for transporting heat medium is lsaw pipe for heating. Used to carry, transport, heat transfer medium is thermal media. Engineering lsaw pipe for heating usually refers to the delivery of hot water, steam pipe. Starting from the boiler room, direct engine room, heating center, etc., from the heat source to the thermal entrance of the building heating pipe. Multiple heating pipes form the pipe network.

Design pressure should be less than or equal to 1.6MPa, temperature less than or equal to 95?, and with the user indoor system connected. Pipeline due to temperature changes caused by thermal expansion and contraction phenomenon, the pipeline by thermal expansion and deformation, cold contraction rupture, in order to avoid this phenomenon caused by pipeline damage called heat compensation. Generally joined in the pipe compensator, pipelines due to temperature changes and elongation of the parts, the heat pipelines are mainly used by the waveform compensator and bellows two.

Laying manufacturer form of lsaw pipe for heating(1) Overhead laying. LSAW pipe for heating laid on the ground stand, truss and building walls. Overhead laying is not affected by groundwater level, and it is convenient for maintenance and inspection. It is suitable for laying areas with high underground water level and unsuitable geological conditions for underground laying. The disadvantage is the large area, pipe heat loss larger. Overhead laying by the height of the stent can be divided into low-stent, stent and high-stent three kinds of laying forms.

2. Trench laying. Laying ditches is divided into the ditch, semi-ditches and ditches are not three types of laid laying.

1. Laying the trench. When the heat pipe straight seam steel pipe manufacturers do not allow excavation of the road at the time; heat pipe straight seam pipe manufacturer or a larger number of pipe diameter; trench on either side of the vertical arrangement of the pipe width of more than 1.5m, the use of ditch Laying. Clearance of the trench should not be less than 1.8m high, the channel width should not be less than 0.7m.

2. Half-way trench laying. When the lsaw pipe for heating through the ground is not allowed to excavation, and the use of overhead laying unreasonable; or a large number of pipes, the use of non-gutter pipe horizontal arrangement of single horizontal groove width is limited, the semi-pass Laying trench. Half-way trench general net height of 1.2 ~ 1.4m, the channel width of 0.5 ~ 0.6m, the length of more than 60m should be provided for access.

3. Laying the trench is not allowed to pass. Pipeline less, smaller diameter, shorter distance, and maintenance workload is not large, it is appropriate not to lay trench laying. Drainage channel is generally not a single row of horizontal laying.

3. Laying directly buried. LSAW pipe for heating manufacturers in the soil corrosive small, low groundwater level (below the bottom of the pipe insulation 0.5m above), the soil has good water seepage and invasion from corrosive liquids in the area, can be directly buried laying. Buried directly buried pipeline insulation structure requires low thermal conductivity, high compressive strength and good fire performance. Pipe and insulation materials should be left between the air layer to facilitate the free expansion and contraction of the pipeline. In the compensator and natural turning should be set to not pass the trench, the guide groove should be set at both ends of the stent, to ensure its free displacement. In the valve and other vulnerable parts, check wells should be set.

The main advantage of a ring-shaped pipe network (the main line is ring-shaped) is the back-up performance of the heating, but its investment and the consumption of steel are much larger than the dendrites. For enterprises that do not allow interruption of supply of steam, they may also use double-decker pipe network, that is, two steam pipes as main lines, each of which is designed to be 50% ~ 75% of the maximum steam consumption. Once a pipe fails, the initial pressure of the steam can be increased so that the amount of steam passing through the other pipe can still be maintained between 90% and 100% of the required amount.

Layout, lsaw pipe for heating layout of the main branches and ring two categories. Dendritic pipe network is relatively simple, low cost, easy operation and management, and its diameter decreases with the distance from the heat source increases. The disadvantage is that there is no thermal backup performance, that is, when somewhere in the network fails, it will affect some of the user's heating.

A worker from a steel pipe company, which is located in China.