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Characteristics and connection method of PE gas pipe
1. Features of PE gas pipe
1. Good hygiene performance: no heavy metal salt stabilizer is added during PE pipe processing, the material is non-toxic, no scaling layer, no bacteria breeding, and it solves the secondary pollution of urban drinking water.
2. Corrosion resistance: Except for a few strong oxidants, it can withstand the erosion of a variety of chemical media; no electrochemical corrosion.
3. Long service life: PE pipes can be used safely for more than 50 years under rated temperature and pressure conditions.
4. Good impact resistance: PE pipe has good toughness and high impact resistance. The heavy object directly presses the pipe without causing the pipe to break violently.
5. Reliable connection performance: The strength of the PE pipe's hot melt or electrofusion interface is higher than that of the pipe body, and the joint will not be broken due to soil movement or live load.
6. Good construction performance: The pipeline is light in weight, the welding process is simple, the construction is convenient, and the overall project cost is low.
2. PE gas pipe connection method
During the application of PE gas pipes, a key factor for the long-term service life of PE gas pipes is the quality of laying. The HDPE pipeline has a variety of unique properties to make the laying of the pipeline safer and faster. At the same time, the correct construction design and installation procedures will make the superior performance of the pipeline to a greater extent.
1. The technology before PE gas pipe construction
ABe familiar with and master the construction drawings before construction;
B Prepare the corresponding construction equipment;
C Conduct induction training for operators, and construction can only be carried out after the training is qualified;
D Acceptance of pipes and fittings in accordance with standards.
2. Excavation of PE gas pipe trench
The excavation of the pipe trench must be carried out in strict accordance with the design drawings or the excavation route and the excavation depth guided by the engineering supervision, and shall not be modified without the consent of the relevant department. It is generally stipulated that the minimum pipe top covering thickness for polyethylene pipes is:
A, the buried depth of the pipe top buried under the carriageway shall not be less than 0.9 meters;
B. Buried under the sidewalk or pipe branch shall not be less than 0.75 meters;
C, the branch pipe under the green belt or residential area shall not be less than 0.6 meters;
D. In permafrost or seasonal frozen soil, the buried depth of the pipe top should be below the freezing line. At the bottom of the sturdy and stable trench, the width of the trench is determined by the operating space required for construction. The space must allow the correct preparation of the trench bottom and the filling and compaction of the trench’s landfill materials. It is necessary to consider the economics of trench excavation costs and the cost of purchasing landfill materials.
3. Preparation of PE gas pipe trench bottom
For pressure systems like water supply, sewage or long-distance transmission pipelines, unless the design drawings have special requirements, generally speaking, the horizontal accuracy requirements of the bottom of the pipe trench are not very high. For gravity drainage systems, the grade of slope must meet the specified requirements.
If the bottom of the trench is quite straight and there are basically no large rocks in the soil, then there is no need to level it. Of course, it would be better if it was an undisturbed bottom layer of the trench. However, if the bottom of the trench has been disturbed or must be disturbed during the excavation process, then its density should at least reach the density of the surrounding landfill material. The bottom of the trench should generally be of no more than 50mm in diameter. The small sharp-edged stones are leveled up with some sand and clay. HDPE pipes of all specifications can generally adapt to a small amount of local unevenness at the bottom of the trench, but if the backfill material contains sharp-edged stones or hard shale, it may cause stress concentration areas on the pipe surface to cause damage pipeline.
For excavation in shale and loose rock soil, in order to avoid contact with loose rocks, a uniform trench bed must be provided for the HDPE pipeline. The general practice is to dig deeper than the specified level when opening the control pipe bottom. At least 150mm, then backfill with appropriate landfill materials to the specified height, and compact to 90% or higher density.
4. Laying of pipes in PE gas pipe trenches
Before the pipe is put into the pipe trench, the pipe should be thoroughly inspected first. Only when no defects are found, the pipe is allowed to be hoisted or rolled into the pipe trench. The pipes are usually pre-connected on the ground. Sometimes the pipes may be pre-connected into many pipe sections about 150 meters long and stored in a certain place. When they need to be lowered and connected, they are transported to the installation site and then connected by hot melt. Or connect these pipe sections by mechanical connection. Pipes with a nominal diameter of less than 20mm can be manually dragged into the pipe trench; for all large pipes, pipe fittings, valves, fire hydrants and accessories, they should be carefully placed into the pipe trench with appropriate tools; for long-distance pipe hoisting, Nylon rope is recommended.
5. Final pipe connection and assembly
The hot-melt connection of the pipeline in the pipe trench is the same as the hot-melt connection of the pipeline on the ground, but it must be ensured that the connected pipeline must be cooled to the ambient temperature of the soil before connection. When connecting with metal pipes, water tanks or pumps, flange connections are generally used. When it is not convenient to use hot melt connection, flange connection can also be used. For flange connection, the bolts should be tightened evenly in advance, and then tightened again after 8 hours.
6, stress test
The pressure test can be carried out before or after the pipeline is backfilled. The pipeline should be covered with soil at a certain interval. Especially for the snake pipeline, the pipeline should be fixed in place during the pressure test. The flange connection part should be exposed to facilitate inspection for leakage.
The test pressure of the pressure test should not exceed 1.5 times the pressure rating of the pipe or the pressure rating of the lowest pressure level fittings in the system. At the beginning, the pressure should be raised to the specified test pressure value and stayed for sufficient time to ensure that the pipe is fully expanded. A process takes 2-3 hours. When the system is stable, increase the pressure to 1.5 times the working pressure, stabilize the pressure for 1 hour, carefully observe the pressure gauge, and patrol along the line, if there is no visible leakage or occurrence during the test If there is a significant pressure drop, the pipeline passes the pressure test.
During the pressure test, the continuous expansion of the pipe will cause a pressure drop. It is normal for a certain pressure drop during the test, and it cannot prove that the pipeline system must be leaking or damaged.
7. Backfill and compaction
Under normal circumstances, the axillary angle and initial backfilling requirements must be at least 90%, the rammed layer should be at least 150mm from the top of the pipe, and direct tamping should be avoided for places less than 300mm from the top of the pipe. The final backfill may use the original excavated soil or other materials, but it must not contain frozen soil, agglomerated clay, and stones with a maximum diameter of not more than 200mm.
Three, PE gas pipe application field:
1. Urban tap water pipe network system.
2, urban and rural drinking water pipelines.
3. Material and liquid transportation pipelines in chemical, chemical fiber, food, forestry, printing and dyeing, pharmaceutical, light industry, papermaking, metallurgical and other industries.
4. Agricultural irrigation pipes.
5. Post and telecommunications lines, power wire protection sleeves.
6. Mine mortar conveying pipeline.
7, post and telecommunications lines, power wire protection sleeves.
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2020-12-07
Characteristics and connection method of PE gas pipe
1. Features of PE gas pipe
1. Good hygiene performance: no heavy metal salt stabilizer is added during PE pipe processing, the material is non-toxic, no scaling layer, no bacteria breeding, and it solves the secondary pollution of urban drinking water.
2. Corrosion resistance: Except for a few strong oxidants, it can withstand the erosion of a variety of chemical media; no electrochemical corrosion.
3. Long service life: PE pipes can be used safely for more than 50 years under rated temperature and pressure conditions.
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PE gas pipe hdpe gas pipe
PE gas pipe adopts gas polyethylene pipe with many excellent properties and is used in the field of gas transportation. The corrosion of steel pipes and cast iron pipes and the leakage of joints will be completely solved, thus ensuring the safe operation of the gas pipeline network system. The PE material selected for the PE gas pipe is an inert material, which can withstand the erosion of a variety of chemical media.
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2018-03-22
Ways to reduce the noise of PVC drainage pipes
While adding stabilizers to improve the chemical stability and strength of pvc pipes, the sound insulation performance of the plastic itself has been greatly weakened. Therefore, in the current situation of reliable mechanical performance of pvc drainage pipes, how to solve the problem of sound insulation and noise reduction has become a top priority. The author believes that we can start with the noise source and adopt the following improvement measures to improve its sound insulation performance:
①It is made into double-wall hollow sound-proof PVC drainage pipe
The special equipment for PVC pipe extrusion is modified, an intermediate mold is added between the inner and outer jacket, and the outer mold is modified to increase the intermediate distance to form a hollow cavity between the two walls, so that the plasticity of PVC will not be changed. But it can increase the damping of the pipe along the flow direction, thereby increasing
Strong sound insulation effect.
Using single-wall double-material PVC pipe
On the basis of the original single-wall PVC pipe, a secondary formula is carried out, that is, the porous sound-absorbing material formed by plastic foaming technology is used to increase the wall thickness to achieve the purpose of increasing the damping along the outer wall direction, so as to obtain a good sound insulation effect. A set of equipment needs to be added, thus increasing the manufacturing cost.
Muffled PVC drainage pipe
The PVC pipe is made into a muffled drainage pipe with spiral fins attached to the inner wall. At this time, its outer wall is still a PVC hard plastic pipe (to ensure the required strength of the drainage pipe), but a certain width of flexible and strong soft is attached to the inner wall Plastic spiral belt, which unloads part of the impact pressure of the water flow onto the spiral belt, thereby buffering the pipe wall.
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2018-03-22
What is the difference between PVC water supply pipe and PVC drainage pipe
1. Different purposes: one for water supply and one for drainage. PVC water supply pipes are mainly used for: a. Indoor water supply and reclaimed water systems for civil and industrial buildings; b. Buried water supply systems for residential quarters and factories; c. Urban water supply pipeline systems; d. Water treatment plant water treatment pipeline systems; e. Marine aquaculture; f. Garden irrigation, well sinking and other industrial pipes. PVC drainage pipes are mainly used for building drainage and domestic sewage drainage.
2. Different specifications: PVC water supply pipes have more specifications and models, and PVC drainage pipes have relatively fewer specifications and models, because the drainage system itself does not require too many specifications. Even with the same model (outer diameter), the wall thickness of the water supply pipe and the drain pipe are often different, because the water supply pipe requires pressure, and the drain pipe usually does not need to consider the pressure.
3. The price is different: This will not be explained in detail, and the specific price can be consulted by each manufacturer.
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No. 8, Minqi 3rd Road, Huaxi Industrial Park, Huashi Town, Jiangyin City, Jiangsu Province, China
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