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Electric hot melt pipe fittings construction matters needing attention

Electric hot melt pipe fittings construction matters needing attention

Matters needing attention in the construction of electric hot melt pipe fittings a, electric hot melt pipe fittings: electric hot melt pipe fittings are arranged on the inner surface of pipe fittings by a certain method. during construction, the electric hot wire in the pipe fittings is electrified and heated with a special heating control power supply to melt and combine the contact surfaces of the pipe fittings and the pipe fittings. after cooling, the pipe fittings and the pipe fittings are firmly and sealingly combined. Due to the fast and convenient construction and good welding effect, electric hot melt pipe fittings are the most widely used polyethylene pipe fittings in the world. A disadvantage of such tubes is the relatively high manufacturing costs. Electric hot melt pipe fittings construction precautions each manufacturer generally use unique

18

2019

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10

PE water supply pipe network to meet the practical application requirements

PE water supply pipe network to meet the practical application requirements

Pe water supply pipe network should meet the demand of practical application 1) lay out the pipe network according to the plan of city planning. when laying out, the possibility of construction of water supply system by stages should be considered, and there should be enough room for development. this part of design mainly considers the development of industry and population in the near and long term of the city to design the pipeline layout. 2) The layout of the pipe network must ensure the safety and reliability of water supply. When an accident occurs in the local pipe network, the water cut-off range should be minimized. 3) The pipeline is arranged in the whole water supply area to ensure that users have sufficient water and water pressure; 4) Strive to lay pipelines in the shortest distance to reduce the cost of pipe network and water supply energy. 3, pipeline longitudinal temperature change

09

2019

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10

Flexible socket connection method and steps for PE water supply pipe

Flexible socket connection method and steps for PE water supply pipe

The socket-type flexible connection of polyethylene pipe is a new type of connection developed with reference to the principle of socket-type flexible connection of cast iron and polyvinyl chloride pipe (pvc-u). It is a PE pipe end welded with a reinforced polyethylene socket. Socket-type flexible connection is to directly insert one end of PE pipe into the special socket of pipe or pipe fitting, press against drawing through the locking ring in the socket, and press the rubber sealing ring to seal, so as to achieve the purpose of connecting pipe and pipe fitting. Pipe PE flexible socket connection steps are as follows ①: cut the pipe according to the required length, and the end face of the cut pipe should be perpendicular to the pipe axis; ②: remove the cut end face

23

2019

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09

What is the welding temperature requirement for hot melt pipe of PE water supply pipe?

What is the welding temperature requirement for hot melt pipe of PE water supply pipe?

PE water supply pipes are divided into low-density PE pipes, medium-density PE pipes, high-density PE pipes, and ultra-high molecular weight PE pipes according to materials. The welding methods and heating temperatures used for different pipes are different. Small diameter or thin wall with socket way, and hot melt PPR pipe is the same, but the heating temperature is different. Low density 160 degree, medium density 190 degree, high density and ultra high molecular weight with 210-decorative knowledge 235 degree. Large diameter requires a special hot melt machine, which is basically divided into 160, 250, 315, 450 and 630 models. Docking (that is, pipes and pipes are directly melted and connected) can also use electricity.

21

2019

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09

Construction of buried PE water supply pipe

Construction of buried PE water supply pipe

Construction of buried PE water supply pipe 1. The burial depth shall be comprehensively determined according to the permafrost depth, use requirements, burial conditions and other factors, usually at least 0.3m below the deepest freezing line, and shall meet the following conditions: when the pipe diameter de<= 50mm, the minimum burial depth of the pipe top shall be 0.5m; However, when the pipe diameter de>50, the minimum burial depth of the pipe top is 0.7-1.0m;2. The trench bottom shall be continuous and flat, and there shall be no gravel, hard blocks and other protrusions on the surface of the trench bottom. 3. The pipeline can be laid directly on the undisturbed original soil foundation. If the foundation is rock or rock, 0.1~0.15m thick fine soil or sand cushion shall be laid. Where uneven settlement of the pipeline system can be caused, the foundation shall be treated or other anti-settlement measures shall be taken .. 4. In the pipeline system, separate foundations shall be established and fixed at the joints of valves, fire hydrants or other auxiliary materials and facilities, and anti-settlement measures shall be taken. 5. When slotting, the width of the trench bottom is generally 0.3m plus the outer warp. If the soil quality is good, when the trench depth is within 2m and within 3m without support, the width shall be added by 0.5m and 0.2m; For trenches with a depth of more than 3m, the width of the trench bottom shall be increased by 0.2m for every 1m of deepening. When the trench is supported by sheet piles, the trench depth is within 2m or 3m, and the trench width shall be increased by 0.4m or 0.6m 6 respectively. when the trench is excavated, the undisturbed soil 0.2m ~ 0.3m above the design elevation of the trench bottom shall be retained, disturbance shall be prohibited, and manual cleaning shall be applied before paving, but it is generally not suitable to dig below the design elevation of the trench bottom. if local over excavation is required, sand or original soil shall be filled and layered compaction shall be required. When the 7 ditch is buried with hard objects such as stones that are not suitable to be removed or the foundation is rock, semi-rock or rock, it shall be removed to 0.15~0.2m below the design elevation, and then sand shall be laid and compacted. The 1PE pipe can be connected to the ground in advance to form a long pipeline. After each welded joint is fully cooled, it will tend to be dragged to the edge of the ditch and placed in it. The maximum drag safety length that the pipeline can bear depends on the size of the pipeline and the conditions of the construction site. Generally, the maximum drag safety distance for small pipelines is 100m, and the larger is 50m. For flat laying, pipelines below DN100 can be slightly bent in summer, & pipelines above 110 can resist thermal stress due to sufficient soil resistance and do not need to reserve pipe length. When the pipeline is buried in a swamp or river bottom, when the backfill soil is too soft to resist the pipeline stress, the two ends of the pipeline are anchored to protect the joint. The paving distance depends on the surface area, specific gravity and the average pressure and friction coefficient between the pipelines. When 3PE pipeline is laid, the allowable bending radius of the pipeline shall meet the following regulations: when there are bearing joints and other auxiliary equipment on the pipe section, it shall not be less than 125D. Pipe nominal diameter D(mm) allowable bending radius (mm)D<= 5030D50

17

2019

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09

Flexible socket connection method and steps for PE water supply pipe

Flexible socket connection method and steps for PE water supply pipe

The socket-type flexible connection of polyethylene pipe is a new type of connection developed with reference to the principle of socket-type flexible connection of cast iron and polyvinyl chloride pipe (pvc-u). It is a PE pipe end welded with a reinforced polyethylene socket. Socket-type flexible connection is to directly insert one end of PE pipe into the special socket of pipe or pipe fitting, press against drawing through the locking ring in the socket, and press the rubber sealing ring to seal, so as to achieve the purpose of connecting pipe and pipe fitting. Pipe PE flexible socket connection steps are as follows ①: cut the pipe according to the required length, and the end face of the cut pipe should be perpendicular to the pipe axis; ②: remove the cut end face

29

2019

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08

The four connection methods of PE pipe are suitable for connecting which pipes

The four connection methods of PE pipe are suitable for connecting which pipes

Hot melt butt connection is generally the main connection method used in large-diameter HDPE pressure pipeline system. Hot melt socket connection is mainly the connection method used in small-diameter HDPE pipes. When HDPE pipes are connected with other pipes such as metal pipes, flange connection must be adopted, and small-diameter pipes can be over-connected with steel and plastic. 1. Hot melt butt joint: Hot melt butt joint is to use hot melt butt welding machine to heat the pipe end (hot melt butt joint temperature is 210±10 ℃). After the pipe end melts, it is quickly attached to maintain a certain pressure and achieve the purpose of welding after cooling. HDPE pipes with a size greater than 90mm can be hot-melt pairs.

27

2019

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08

PE pipe welding temperature PE pipe construction welding temperature

PE pipe welding temperature PE pipe construction welding temperature

PE pipes are divided into low density PE pipes, medium density PE pipes, high density PE pipes, and ultra-high molecular weight PE pipes. The welding methods and heating temperatures used for different pipes are different. Small diameter or thin wall with socket way, and hot melt PPR pipe is the same, but the heating temperature is different. Low density 160 degree, medium density 190 degree, high density and ultra high molecular weight with 210-decorative knowledge 235 degree. Large diameter requires a special hot melt machine, which is basically divided into 160, 250, 315, 450 and 630 models. Butt connection (that is, pipe and pipe are directly melted and connected) can also be connected by electric melt pieces.

27

2019

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08

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