PPR is the abbreviation of random copolymer tri-propylene. PPR pipeline is now widely used and has many advantages. It is corrosion-resistant and has no risk of algae growth. The pipe wall is thinner. Compared with composite fiber tubes, the flow rate can be increased by 14% at the same rate. Its weight is lighter than that of stainless steel tubes, and it is easier to handle transportation and field, and it is fast welding, so it is more convenient to install. It has good sound insulation effect, which can reduce water flow and hydraulic impact . Compared with metal pipes, the noise reduction advantage is obvious.
composite pipe is extruded into by multiple layers of . Since the middle layer is filled with aluminum layer or fiber, it has higher stability. As shown in the picture.
Composite fiber technology
The connection between pipes and fittings is generally completed by hot melting tools socket welding or pipe joint welding. Commonly used welding equipment is shown in the figure:
Before welding and heating, first assemble and fasten the welding tools. All welding tools must be cleaned. If necessary, use rough fabrics without fibers and alcohol to clean.
Place the welding head on the welding machine so that the melt head and the heating plate are in full contact. The welding head that exceeds the diameter of 40mm must be installed on the rear hole of the heating plate, as shown in the figure:
Correctly install
Incorrectly install
Then plug in the welding machine power supply. According to the surrounding temperature, it takes 10-30 minutes to heat the heating plate.
welding die head must be fully attached to the heating plate, and must never use pliers or any inappropriate tools as it will damage the coating of the welder. The required temperature for
welding is about 260℃. The temperature can be detected by infrared thermometer . If the welding machine is closed or has a long pause time, the heating process needs to start again. After using
, turn off the welding machine and cool it naturally. Do not cool it with water, as this will damage the heating resistance. When pushing the
pipe inward, do not rotate it until the weld depth marked by the welding tool. After the preheating time is specified, quickly remove the pipes and accessories from the welding head, immediately connect them together and cannot rotate until the mark of welding depth is covered by the crimp of PP material on the accessories. Be careful not to have too deep pipe propulsion accessories, as it may reduce the inner diameter and even block the pipe. The above welding method is the most commonly used pipe connection technology. The following figure is the following. The following is a kind of electric fusing sleeve connection.
electric fusion splicing equipment is specially developed for electric fusion sleeves. It is made by energizing the electric fusion sleeve for welding.
Electromultiplexing equipment
Electromultiplexing casing
The pipeline that needs to be inserted into theElectromultiplexing casing needs to be peeled, burrs are removed, and the insertion depth position is marked. When ready, push the fused sleeve into the end of the clean and dry pipe to the marked depth, and use a pressing forceps if necessary. Then push the pipe treated at the other end into the electrofusion sleeve and tighten it well. After installation, the sleeve can move freely on the pipe and the gaps around it must be evenly and consistent.
adjusts the welding equipment to the appropriate parameters, starts the welding equipment and monitors it. The pipe joints after welding shall not be moved or pressurized before they are completely cooled. The cooling time is generally marked on the sleeve. If the ambient temperature exceeds 25 degrees Celsius, the cooling time needs to be appropriately extended. The process is as follows:
push into
position determines
Electric welding
In recent years, in order to reduce weight and prevent steel pipe corrosion and contaminate fresh water, ships have begun to use this environmentally friendly PPR pipe , which is easy to install and has a long life. Beloved by more and more ship owners.
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