Piping is an indispensable component of chemical production, which must be piped to convey and control fluid media. Therefore, the pipeline installation is related to the operation of the pump equipment, is the basis for the effective transport of media, today Ace lobe pump 's and everyone together to talk about the pipeline installation should pay attention to several issues.
1. All pipe frames and brackets must be fastened before installation of the pipes. For equipment installed on a foundation with a large amount of subsidence, the pipes connected to it must be installed after the equipment has been correctly positioned and stabilised by hydraulic subsidence. Before the pipe is combined or the pipe and the combined parts are installed, the inside of the pipe and fittings should be cleaned.
2, the installation of seamed steel pipe pipeline, should make its longitudinal seam is located in the pipeline hydraulic test is easy to check the location. Where through the floor, walls, foundations, railways and highways of the pipeline, should be added to protect the sleeve and the pipe section within the pipe generally shall not have a weld, if it has to have a weld, should first test pressure, qualified before installation. The steel pipe and the casing should be filled with insulation material.
3、The straightness of the pipe should be measured at 200mm from the interface, when the nominal diameter of the pipe is less than 100mm, the permissible deviation is 1mm; when the nominal diameter of the pipe is greater than or equal to 100mm, the permissible deviation is 2mm, but the permissible deviation of the whole length shall not exceed 10mm. the pipe shall not be strongly counterpoised when connected, and the weight of the pipe is generally not allowed to be supported on the machine and pump equipment. When connecting pipes, strong counterparts, bias pads or multi-layer pads shall not be used to eliminate defects such as gaps, skew, misalignment or uncentricity of the interface end face.
4, flange connection should be concentric with the pipe, and should ensure that the bolts are free to penetrate, flange bolts should be staggered in the direction of the arrangement of the row of pipes, flanges should be kept parallel to each other, its deviation shall not be greater than 1. 5% of the outer diameter of the flange and not more than 2mm, shall not use the strong tight bolt approach to eliminate skew. Flange connection should use the same specification of bolts, installation direction should be consistent. Bolts should be tightened symmetrically to ensure uniform compression of the sealing gasket. The bolts shall be tightened against the flange and there shall be no wedge seam. When additional gaskets are required, there should be no more than one per bolt. All nuts should be fully screwed into the bolt and the tightened bolt and nut should be flush or exposed by 1-2 pitches. When installing bolts (nuts) of stainless steel and alloy steel, pipes designed for temperatures above 100°C (or below 0°C), open-air installations, in atmospheric corrosive environments or conveying corrosive media, the bolts (nuts) should be coated with molybdenum sulphide grease, graphite oil or graphite powder. Bolts of high or low temperature pipes should be tightened in the hot state or in the cold state as specified during test runs.
5, the pipeline containing solid media, the main and branch pipe in addition to those specified in the design, the general requirements of not more than 30 connected; interface weld root should be smooth, no weld tumor in the inner wall of the pipe.
6, buried pressure pipeline, should first check the support of the foundation and foundation, to be qualified before the installation. In case of groundwater or waterlogging, the installation should be drained first and the welded joints should be tested for strength and tightness before taking anti-corrosion measures. The backfill should not contain stones, bricks and other debris within 200mm from the sides and top of the pipe. Both sides of the pipe should be compacted at the same time to prevent misalignment of the pipe. The backfill layer within 200mm from the top of the pipe should only be compacted and should not be rammed with instruments; above 200mm it should be compacted in layers every 200-300mm.