Pipeline acceptance standards and correct procedures
Pipeline engineering includes gas pipeline, water supply and drainage pipeline, air pipeline, etc. The construction quality of these pipelines directly affects our daily life and must be carefully checked and accepted. After checking that all the pipes meet the requirements, don't forget to let the construction team leave wiring diagrams, especially concealed wiring, and be sure to leave accurate wiring diagrams for electricals in case of emergency repairs.
Pipeline acceptance standards
Water supply and drainage pipeline
1. The quality of water supply and drainage pipes and fittings must meet the standard requirements. The drainage pipeline shall consist of rigid PVC drainage pipes and fittings.
2. It is necessary to check whether the original pipeline is unblocked before construction, and then carry out construction, and check whether the pipeline is unblocked after construction. Concealed water supply pipeline should be inspected by water. For newly installed water supply pipelines, pressure test must be carried out in accordance with relevant regulations, and there should be no leakage. Only after passing the inspection can you proceed to the next process.
Gas pipeline
Pressure test
The pressure test is to use the air compressor to fill the gas pipeline with compressed air, and use the air pressure to test the tightness of the pipeline interface and the material. According to the inspection purpose, it is divided into strength test and air tightness test.
Strength test
The strength test is to use a higher air pressure to check the tightness of the pipeline interface (including the pipe). The test pressure depends on the gas transmission pressure grade of the pipeline and the material of the pipeline. In general, the test pressure is 1.5 times the design gas transmission pressure, but for steel pipes, it should not be less than 0.3Mpa, while, for plastic pipe it should not be less than 0.1Mpa, and for cast iron pipe it should not be less than 0.05Mpa.
Air tightness test
The air tightness test is to use air pressure to check the tightness of the pipe and the interface of the pipeline under the condition of similar gas transmission. Therefore, the air tightness test needs to be carried out after the installation of the gas pipeline is completed. If the pipe is laid underground, the test must be carried out after filling the soil to 0.5m above the pipe top.
Correct procedures for pipeline acceptance
Pipeline engineering includes gas pipelines, water supply and drainage pipelines, air pipelines, etc. The construction quality of these pipelines directly affects our daily life and must be carefully checked and accepted. The pipeline acceptance procedure is as follows:
1. Check whether the gas meter is installed, the gas alarm of the gas meter is installed. Check whether the natural gas has entered the household, check whether the natural gas has entered the household, check the number in the gas meter, record it in paper, and deduct it when paying the gas fee in the future. Check whether a dedicated exhaust pipe is installed.
2. To check the gas pipeline, you can use a smoky paper roll to put it near the alarm device to see if the alarm device is sensitive, whether the alarm sound and light prompt to close the intake solenoid valve at the same time. If it fails to act, repair it in time.
3. See if there are floor drains or downpipes on the balcony. Pour some water into the floor drain to see if the water is smooth. Although the floor drain is small, its role cannot be underestimated. If there is no floor drain or water outlet on the balcony during heavy rain, the rain water will overflow into the living room, causing great trouble to the owner's life.
4. Check whether the water outlet, eaves gutter and downpipe are installed firmly, whether the interface is smooth and tight and without leakage.
5. Check whether the house is clean, whether there is residual construction waste, and see if there is any waste in all open pipe spaces.
6. The kitchen and bathroom should be close to the ventilation duct, which is conducive to the rapid discharge of odors, exhaust gas and other gases, and keeps the indoor air clean. Ignite a paper roll and extinguish the fire. Then, put the smoky paper roll about ten centimeters below the entrance of the flue to see if the smoke rises to the entrance of the flue and then turns around and is sucked away immediately.
7. The bathroom should have vents under the ceiling. When the vent is set above the ceiling, check whether it is installable with a hand lamp, and use the above method to measure the pulling force. Use a flashlight to check whether there is construction waste in the flue or vent. Anti-theft net should be installed in the bathroom with windows in the corridor. If there are no windows, there should be ventilation holes, which should be located under the ceiling.
8. Check the installation, smoothness and sealing of the pipeline: shake the heating pipe and the water supply pipe by hand, to see if it is firmly fixed. If loose, it should be fixed again. Open the water valve to see if the drainage is smooth (otherwise the sewer pipe is blocked by construction waste). While draining water, wipe the bottom of the upper and lower pipes with toilet paper to see if there is any leakage.
Pipeline acceptance standards
Water supply and drainage pipeline
1. The quality of water supply and drainage pipes and fittings must meet the standard requirements. The drainage pipeline shall consist of rigid PVC drainage pipes and fittings.
2. It is necessary to check whether the original pipeline is unblocked before construction, and then carry out construction, and check whether the pipeline is unblocked after construction. Concealed water supply pipeline should be inspected by water. For newly installed water supply pipelines, pressure test must be carried out in accordance with relevant regulations, and there should be no leakage. Only after passing the inspection can you proceed to the next process.
Gas pipeline
Pressure test
The pressure test is to use the air compressor to fill the gas pipeline with compressed air, and use the air pressure to test the tightness of the pipeline interface and the material. According to the inspection purpose, it is divided into strength test and air tightness test.
Strength test
The strength test is to use a higher air pressure to check the tightness of the pipeline interface (including the pipe). The test pressure depends on the gas transmission pressure grade of the pipeline and the material of the pipeline. In general, the test pressure is 1.5 times the design gas transmission pressure, but for steel pipes, it should not be less than 0.3Mpa, while, for plastic pipe it should not be less than 0.1Mpa, and for cast iron pipe it should not be less than 0.05Mpa.
Air tightness test
The air tightness test is to use air pressure to check the tightness of the pipe and the interface of the pipeline under the condition of similar gas transmission. Therefore, the air tightness test needs to be carried out after the installation of the gas pipeline is completed. If the pipe is laid underground, the test must be carried out after filling the soil to 0.5m above the pipe top.
Correct procedures for pipeline acceptance
Pipeline engineering includes gas pipelines, water supply and drainage pipelines, air pipelines, etc. The construction quality of these pipelines directly affects our daily life and must be carefully checked and accepted. The pipeline acceptance procedure is as follows:
1. Check whether the gas meter is installed, the gas alarm of the gas meter is installed. Check whether the natural gas has entered the household, check whether the natural gas has entered the household, check the number in the gas meter, record it in paper, and deduct it when paying the gas fee in the future. Check whether a dedicated exhaust pipe is installed.
2. To check the gas pipeline, you can use a smoky paper roll to put it near the alarm device to see if the alarm device is sensitive, whether the alarm sound and light prompt to close the intake solenoid valve at the same time. If it fails to act, repair it in time.
3. See if there are floor drains or downpipes on the balcony. Pour some water into the floor drain to see if the water is smooth. Although the floor drain is small, its role cannot be underestimated. If there is no floor drain or water outlet on the balcony during heavy rain, the rain water will overflow into the living room, causing great trouble to the owner's life.
4. Check whether the water outlet, eaves gutter and downpipe are installed firmly, whether the interface is smooth and tight and without leakage.
5. Check whether the house is clean, whether there is residual construction waste, and see if there is any waste in all open pipe spaces.
6. The kitchen and bathroom should be close to the ventilation duct, which is conducive to the rapid discharge of odors, exhaust gas and other gases, and keeps the indoor air clean. Ignite a paper roll and extinguish the fire. Then, put the smoky paper roll about ten centimeters below the entrance of the flue to see if the smoke rises to the entrance of the flue and then turns around and is sucked away immediately.
7. The bathroom should have vents under the ceiling. When the vent is set above the ceiling, check whether it is installable with a hand lamp, and use the above method to measure the pulling force. Use a flashlight to check whether there is construction waste in the flue or vent. Anti-theft net should be installed in the bathroom with windows in the corridor. If there are no windows, there should be ventilation holes, which should be located under the ceiling.
8. Check the installation, smoothness and sealing of the pipeline: shake the heating pipe and the water supply pipe by hand, to see if it is firmly fixed. If loose, it should be fixed again. Open the water valve to see if the drainage is smooth (otherwise the sewer pipe is blocked by construction waste). While draining water, wipe the bottom of the upper and lower pipes with toilet paper to see if there is any leakage.
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