Guide to installing FRP pipes

Although installation is not usually considered part of the design of a piping system, it is an important part of a successful system and we feel it needs to be emphasized here. There is no doubt that more problems occur in FRP piping systems due to improper installation than any other single cause, and there are many steps that must be followed to ensure that problems do not occur in the future.

 

① FRP pipe should be inspected for appearance and size before construction, and accepted according to the factory certificate of conformity.

② Pipeline installation drawings are the basis for pipeline installation works, the laying of FRP/PVC pipe (including the form of connection, coordinates, elevation, slope, slope direction, etc.) support, FRP/PVC pipe and equipment, pipeline accessories connection, pipeline accessories installation location, support, etc., should be in line with the design drawings, such as changes, must be resolved in consultation with the design unit.

③ Pipe installation, according to the pipe section divided by the pipe installation diagram, can be installed from one end of the pipe in order to the other end of the pipe accessories, and then set up brackets or supports (if necessary, temporary support is required during the installation process). When the pipe is lifted, the outer wall surface must take protective measures, and direct contact with the wire rope is prohibited, so as not to cause local stress.

④ The connection point of FRP pipe is only allowed in the straight pipe part. The distance between the butt welding connection point and the edge of the pipe support should be greater than the outer diameter of the pipe and not less than 100mm; the distance between the socket connection and the edge of the pipe support should be greater than 150mm.

⑤ The connection structure of the pipe is in the form of socket connection, flange connection (welded ring flange connection and composite flat welding flange connection), and butt welding connection. This project will determine the installation method according to the specific requirements of the design documents.

(6) The installation workers engaged in welding must hold a welder's certificate and be familiar with the performance of FRP/PVC pipe adhesive and its installation method, and have skilled PVC welding operation ability.

(7) Before the pipe is connected by socket, the inner wall dirt of the PVC pipe should be removed from the connection, and then the socket should be inserted into the socket, and the socket should not be skewed, cracked or other defects, and the socket depth should be reached before PVC welding is carried out.

⑧ The socket part should be enhanced by FRP, evenly coated with a layer of R glue at the enhancement, coating thickness is uniform, shall not leak and flow, then wrap a layer of glass cloth, coated with unsaturated resin, wrap glass cloth, repeatedly until the thickness reaches the requirements.

⑨ When the socket installation fails to pass the need for rework, the socket plug and socket must be re-made, and shall not use the used socket plug.

⑩ When flange is connected to the pipe, both inside and outside sides must be welded to the pipe, the flange surface and pipe axis inclination should be less than or equal to 1/100 of the outside diameter of the pipe. flange connection should be strictly aligned, the maximum allowable deviation in the axial direction is not more than 2mm, and the method of strong tightening bolts should not be used to eliminate skew. Tighten the bolts in two times, the first time evenly and symmetrically screwed once, and then tighten the bolts again.

 

FRP pipe connection requirements

When the interface works, the ambient temperature is not less than 10℃; the curing temperature after bonding is not less than 15℃, and the curing holding time is not less than 12 hours. Design the paste interface according to the laminate. According to the sample data, planned gel time, ambient temperature, etc., mix the resin and stir thoroughly. When the bonding thickness is more than 10mm, it should be formed in stages. Before each molding, the cured surface of the last molding should be polished.

 

Yongchang specializes in the production of various, FRP chemical storage tanks and FRP process tube can be customized! Ex-factory price, perfect after-sales service.