How to use the double-sealed flexible waterproof casing?

How to use the double-sealed flexible waterproof casing?
According to customer feedback flexible waterproof casing in the use of the process, with the more time prone to waterproof casing parts sealing is not tight, groundwater infiltration into the well, so that the valve and pipeline in the well soaked in water, resulting in serious corrosion phenomenon. Leakage of flexible waterproof casing through the wall of the pipe causes huge economic losses. Flexible waterproof casing leakage prevention program than the choice for the pipeline through the wall parts, the current widespread use of oil sisal cement seal waterproof casing, flexible waterproof casing and pipe between the plug into the oil sisal, the two ends of the cement seal. This structure does not take into account the problem of thermal expansion and contraction of the pipeline, does not play a role in preventing seepage, leakage problems are very common. Facilitate the installation and construction of the project. If not reserved waterproof casing, generally speaking, is required to do the civil construction of the square box to play concrete. So that after the installation of the pipe, the civil engineering staff will have to deal with the other side of the hole, far from the initial set aside casing to facilitate quick. Convenient for later maintenance. If for some reason the pipe is to be removed and replaced, the installation of waterproof casing later pipe maintenance demolition will be much more convenient. For those rooms where the ground may often have water, such as kitchens, bathrooms, etc., waterproof casing 20mm above the decorative surface, will stop the water flowing down the pipe. Especially reserved casing, and its waterproofing ground has a good contact, waterproofing performance is much higher than those reserved square hole and then after the practice of filling the hole.