Construction scheme of water supply pipeline in dust-free laboratory
Construction scheme of water supply pipeline in dust-free laboratory
The connection scheme of non-metallic pipes in dust-free laboratory:
Question 1 The plastic water supply pipe leaks during the water test.
Solution:
1) Most of the plastic water supply pipes are concealed, and the following installation methods should be used:
①Embedded casing.
②Reserve wall grooves and plate grooves, try to shorten the installation period...
Text label: Dust-free pharma machinery pipeline installation, laboratory water supply pipeline construction
Construction scheme of water supply pipeline in dust-free laboratory
The connection scheme of non-metallic pipes in dust-free laboratory:
Question 1 The plastic water supply pipe leaks during the water test.
Solution:
1) Most of the plastic water supply pipes are concealed, and the following installation methods should be used:
①Embedded casing.
②Reserve wall grooves and plate grooves, and try to delay the installation period to reduce the probability of damage to the pipeline due to the intersection of work types.
2) Do a good job in the protection of finished products, and coordinate with civil works.
3) For aluminum pipe fittings, it should be carefully installed, once successful, do not disassemble repeatedly.
4) Sectional pressure test, that is, install a section of concealed pipeline, and test the pressure for a section. The pressure test must meet the requirements of the specification and the manufacturer; after all installations are completed, the overall pressure test is performed again.
5) Replace damaged pipes and fittings.
Question 2 The rigid polyvinyl chloride plastic pipe is found to be leaking during use.
Solution:
1) The plastic pipe should be inspected before installation, and the bending part of the pipe should be straightened. The method is to place the pipe on the straightening platform and inject steam into the pipe to heat the pipe and soften it. Self-cooling and straightening at the bottom; when using welded joints, the counterparts should be positive; the expansion coefficient of the rigid PVC pipeline is large, and a thermal compensator should be installed on the pipeline.
2) Rigid PVC pipe bending should be carried out under heating. Generally, the hot sand of 40~50℃ is poured into the pipe first, and then tamped with a mallet.
Water supply pipeline laying scheme of dust-free laboratory:
Question 1 The indoor domestic water supply pipes in the dust-free laboratory do not meet the installation requirements.
Solution:
1) During the design and construction process, the water supply pipes should be selected and used according to the national regulations and the regulations of the local competent authorities on water supply pipes. When steel pipes (cast iron pipes) must be used, anti-corrosion treatment should be performed on the inside and outside of the steel pipes (cast iron pipes). Zinc steel pipes must also be treated with anti-corrosion).
2) The pipes and fittings used in the water supply system should not only meet the current specifications and corresponding product standards, but also require that their working pressure is not greater than the allowable working pressure marked in the product standard. The allowable working pressure of the pipe fittings depends not only on the pressure-bearing capacity of the pipe material and the pipe fittings, but also on the tensile force that the pipe interface can bear. The lower of the three allowable working pressures is the allowable working pressure of the piping system.
3) Some plastic pipes and their composite pipes (such as PP-R, aluminum-plastic composite pipes, etc.) generally have cold and hot water pipes. When choosing to use, it should be noted that plastic cold water pipes should not be used in hot water systems. Polyethylene and cross-linked polyethylene plastic pipes are also not allowed to be used in hot water systems.
4) For pipes that may be exposed to direct sunlight, such as roofs and external walls, metal pipes or steel-plastic composite pipes should be used. When plastic pipes are used, effective protection measures should be taken. measure. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for laboratories and sterile rooms.
Problem 2 Galvanized steel pipe welding galvanized pipe fittings are not enough.
Solution:
1) Make a supply plan for galvanized pipe parts in time to ensure the needs of installation and use.
2) Carefully study and implement the operating procedures.
3) Remove the welded part of the pipe, use the method of threaded connection, replace the non-galvanized pipe fittings with galvanized pipe fittings, and re-install the pipes.
Problem 3 The indoor water supply pipeline is not flowing smoothly or the pipeline is blocked.
Solution:
1) Before the installation of the pipeline, the interior should be carefully cleaned, especially the used pipeline, which must be repeatedly pulled several times with a wire tie to remove the rust or debris in the pipe.
2) When the pipe is cut with a pipe cutter, the pipe mouth is prone to shrinkage. Generally, pipe milling is used to expand the pipe to ensure that the section does not shrink.
3) During the installation process of the pipeline, the pipe should be sealed at any time to prevent foreign objects from falling in during cross construction; the water storage tank installed on the water supply system should be covered in time to prevent debris from falling into it.
4) The overflow pipe of the water tank should not pass into the drainage pipe, but it can be separated by a certain distance.
5) After the installation of the pipeline, the water pressure test shall be carried out according to the requirements of the design or construction acceptance specification, and the system shall be repeatedly flushed with water before the system is put into use.
6) When it is found that the pipeline is not flowing smoothly or is blocked, it must be carefully observed to determine the blocked water point, and then disassemble and dredge.
Problem 4 Improper setting of indoor drainage horizontal pipes.
Solution:
1) Designers should have basic design knowledge.
2) Designers should understand the basic principles of indoor drainage pipeline layout.
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