Sinyane pump industry's analysis of common problems in the drainage pipeline of submersible axial flow pump

According to the provisions of the quality acceptance standards for the drainage engineering of submersible axial-flow pump, the use of submersible axial-flow pump is different, the materials and models of submersible axial-flow pump are also different, and the comprehensive analysis of pipeline engineering construction at different application positions is carried out. The risk control and implementation process management are carried out at each construction stage to improve the quality level of submersible axial-flow pump.
Today, the Xiaobian of Xiyan pump industry will share with you the experience summarized by some technicians of our company in their daily work. If you can handle it, the salary and water service will rise one level.
Difficult problem 1: the length and orientation of the anchor bolt in the looper flange do not meet the requirements, and the anchor bolt is polluted by the environment.
Correct method: the diameter and length of the anchor bolt connecting the flange shall meet the regulations. After tightening, the length of the protruding nut shall not exceed 1 / 2 of the screw diameter of the extruder.
Difficult problem 2: the length of the exposed wire does not meet the requirements.
Correct method: after the construction of bolted pipeline, there shall be 2 ~ 3 exposed external threads at the root of external threads, and unnecessary oakum shall be removed and cleaned and anti-corrosion shall be solved.
Difficult problem 3: hot dip galvanized steel pipe welding flange on the spot.
Correct method: the hoop type flexible connection should be selected for the hot-dip galvanized steel pipe. The active zinc oxide caused by the electric welding of the galvanized steel pipe can poison the workers and endanger the smooth and smooth level of the inner cavity of the pipeline. If electric welding is required, the construction procedure shall be changed to carry out electric welding, and the secondary hot galvanizing shall be carried out after welding, and the welding stress and deformation in the whole process of hot galvanizing shall be straightened.
Difficult problem 4: the distance of the connecting pipe section in front of the water meter does not meet the requirements.
Correct method: install the screw wing water meter, and the front of the meter and the gate valve shall have a parallel pipe section not less than 8 times the diameter of the socket of the intelligent water meter. The distance between the casing and the surface layer of the wall is 10 ~ 30mm.
Difficult problem 5: the stainless steel flange connection of submersible axial flow pump adopts general carbon steel anchor bolts or hot-dip galvanized anchor bolts instead of insulating layer, resulting in the principle of primary battery.
Correct approach: due to the differences in the composition and physical characteristics of different materials, the principle of primary battery with point contact of different electrical conductors should be considered first. In terms of service life, the principle of primary battery can not be ignored.
Difficult problem 6: stainless steel pipe and carbon steel pipe shall be welded immediately.
Correct method: due to the difference of composition and physical characteristics of different materials, the principle of galvanic cell between different electrical conductors should be considered first. Flange connection should be considered between different materials, and the insulation layer of anchor bolts should be considered.
Problem 7: the position of the pipe support at the inlet and outlet of the submersible axial flow pump is incorrect, which makes the shock absorber under the submersible axial flow pump invalid
Correct practice: the key consideration is to deal with the removal of vibration transmission between submersible axial flow pump and pipeline and prevent co vibration. The installation position of stainless steel clamp is not set separately, and the support mode and position need to be different.
Chongqing Sinyane pump industry sincerely serves you!