Email:sales@jinbeiextruder.comQingdao Jeebo Machinery Co.,Ltd

Qingdao Jeebo Machinery Co.,Ltd

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Qingdao Jeebo Machinery Co.,Ltd

Add: No.15, Guangdong Road, Beiguan Industrial Park, Jiaozhou City, Qingdao, China

Tel: +86-532-82287388

Представительство в РФ: (423)249-22-82 

Mobile: +86-13792822973(wahtsapp available)

Mobile: +86-13793207543(whatsapp available)

E-mail: sales@jinbeiextruder.com

PE Pipe Winter Use Precautions(二)

Fourth, pipe construction:

1. PE pipe construction operation flow chart

 图3

2. Precautions for PE pipe construction:

 1)After cutting the continuous strip of residual material after cutting, it is necessary to idling a few turns and then withdraw the moving clamp to close the milling cutter;

2)After the cutting is completed, the butt end face should be straightened again, so that the misalignment rate does not exceed 10% of the thickness of the pipe;

3)PE pipe welding temperature 220 ± 10 ° C, due to low temperature in winter, the temperature can be set at 230 ° C, if the environment below -5 ° C welding needs to be covered with cotton cloth cooling; if the winter wind is large, you need to pipe two ports Cover with plastic cloth, etc., to prevent "wearing the wind", and at the same time set up a tent to avoid the melting temperature of the pipe due to the wind, and can not be bonded together.

4) endothermic time calculation: when the wall thickness is ≤ 8mm, 0.5mm crimping; 8mm < wall thickness <16mm out of 1mm crimping; wall thickness ≥ 16mm out of 1.5mm crimping, start heating time, instead of When the pipe is in contact with the heating plate, the timing is started, the heating time is the wall thickness × 10-13 seconds, the winter temperature is low, and the heating time is set to 13 seconds.

5 )Cooling time is the wall thickness × 1 minute, the tube can not be moved completely without cooling, so as to avoid the pipe from breaking from the weld.

6 )The welded joint should be naturally cooled, and the welding of the pipe should be avoided due to the invasion of water, wind and dust.

7 )After installation, the welding effect is tested: the flange joint should have a smooth and symmetrical flange along the entire circumference of the pipe. The bottom of the flange should not be lower than the surface of the pipe; the flange is solid and smooth, and should not have impurities, small holes, distortion and damage.

Fifth, the pipe consolidation:

1. Special attention should be paid to the earthwork excavated on both sides of the pipe ditch to prevent the stone from falling into the pipe trench and impacting the pipe; another part should be backfilled immediately after the construction, and the backfilled soil should be good soil (or sand filling), and no hard objects should be allowed. (Frozen soil) is in contact with the pipe material, and the thickness of the good soil on both sides and above the pipe is 20 to 30 cm or more.

2. Pipe fittings (elbows, tees, flange ends) and divergent joints of φ110mm or more in the pipeline must be concrete consolidated to prevent the joint parts from being damaged by water flow to ensure normal use of the pipeline in the future.

Sixth, pipeline pressure test

1. After the pipeline installation is completed, the water to be welded is completely cooled and then tested. The length of the test pipeline is preferably 500m. It is strictly forbidden to carry out water test operation under low temperature conditions. When the pipeline is pressure tested, it is necessary to ensure that the water temperature in the pipeline is equal to the ground temperature at that time, and to prevent the pressure of the pipeline from being affected by the temperature difference. The pipe must be backfilled with 40cm to test pressure. Do not use air pressure test.

2. Install the exhaust valve at the water inlet, outlet, and the highest point. When testing, first open the exhaust valve before filling, then slowly fill the water. After the water valve has a water column evenly flowing out, turn down from low to high. When the pressure is increased to 0.2-0.3Mpa, the exhaust gas is exhausted several times, the residual air is completely removed, and then the pressure is increased to the specified pressure value, and then the pressure gauge is observed for 1 hour, and the pressure-reducing or depressurizing range is 0.05. Within the Mpa is qualified.


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