The installation of the packing type vertical multi-stage long shaft semi submersible deep well turbine pump must strictly follow the mechanical assembly specifications and safety operation procedures. Although it has gradually been replaced by the machine seal type, it still needs to be operated in a standardized manner in specific low-risk scenarios. The following are the systematic installation steps and key control points for vertical multi-stage long shaft semi submersible deep well turbine pumps:
Preparation before installation
Basic and well management verification
 
·Concrete foundation strength ≥ C25, surface levelness deviation ≤ 0.5mm/m (full plane ≤ 2mm), embedded bolt center distance deviation ≤ ± 2mm;
·The inner diameter of the well casing should be 50-100mm larger than the maximum outer diameter of the pump body, the verticality of a single section should be ≤ 5mm/m, and the cumulative deviation of the entire well section should be ≤ 50mm;
·The inner wall of the well casing is free of scale and protrusions, the roughness of the flange sealing surface Ra is ≤ 6.3 μ m, and the connecting surface is free of rust or damage.
 
Equipment and component acceptance
 
·Transmission shaft straightness: ≤ 0.1mm per meter, total length ≤ 0.3mm (tested using V-shaped iron+dial gauge);
·The impeller has no cracks or deformations, and the guide vane passage is smooth without casting defects;
·The insulation resistance of the motor is ≥ 0.5M Ω (measured by a 500V megohmmeter), and the grounding terminal is clear and reliable;
·Rubber bearings are strictly prohibited from coming into contact with grease to prevent aging and deformation.
 
Tools and Site Preparation
 
·Essential tools: lifting equipment weighing over 25t, torque wrench, frame level (accuracy 0.02mm/m), dial gauge (accuracy 0.01mm), feeler gauge, hydraulic tensioner;
·The installation area is flat and free of debris, with no obstacles within 5 meters around the wellhead, and the lifting passage is unobstructed.
Installation process and key operations
Assembly of pump body and transmission shaft
·Install the impeller and guide housing in sequence on the pump shaft, ensuring that the axial displacement meets the design value (usually 0.2-0.3mm);
·The overall straightness of the transmission shaft combination is ≤ 0.3mm, and it is strictly prohibited to forcibly straighten or strike it;
·Clean the sealing surface before connecting the flange of the water lifting pipe and use nitrile rubber sealing rings (compression permanent deformation ≤ 20%).
Lifting into the well
·Slowly lower the pump unit vertically using a specialized lifting device to avoid colliding with the wellbore;
·When connecting each section of the lifting pipe, ensure that the concentricity deviation is ≤ 0.1mm and that the flange bolts are symmetrically and evenly tightened;
·The submergence depth of the first stage impeller is ≥ 3m, and the bottom of the pump seat is ≥ 1m away from the bottom of the well to prevent the suction of sediment.
Installation and adjustment of stuffing box
·Choose graphite impregnated oil woven packing or PTFE material, with specifications matching the inner diameter of the packing box;
·The cutting angle of each circle of packing is 30 ° -45 °, and adjacent cutting angles are staggered by 90 ° -120 ° to avoid the formation of leakage channels;
·Fill 4-6 circles, press the cover to a depth of 1/3 of the packing height, and tighten the bolts evenly and symmetrically;
·Do not crush at once, the initial leakage rate should be controlled at 30-60 drops/minute, and fine tune to a stable state after operation.
Motor docking and alignment
·The recommended axial clearance for the coupling is 3-5mm to compensate for thermal expansion and axial displacement;
·Radial and axial alignment deviation ≤ 0.05mm/m, use a dial gauge to detect and ensure no eccentric vibration;
·Weather resistant cables are used for electrical wiring, and waterproof sealing treatment is applied to the joints. The grounding resistance is ≤ 4 Ω.
Trial operation and initial debugging
Before starting the pump:
·First, seal the shaft with water for 5 minutes to ensure sufficient lubrication of the packing;
·Manually turn the wheel 3-5 times and confirm that it rotates smoothly without any obstruction.
First launch:
·Run without load for 5-10 minutes, observe the temperature of the stuffing box (≤ 60 ℃) and the leakage rate (stable at 30-60 drops/minute);
·If the leakage is too large, fine tune the gland; If it heats up and burns your hands, stop the pump immediately, loosen the cover and readjust.
After stable operation:
·Record current, vibration, and temperature rise data, and establish an initial operating file;
·Frequent starting and stopping is strictly prohibited, with no more than 5 times per day, to avoid carbonization of the filler caused by thermal shock.
Key points of safety and compliance
·Installation personnel must hold a certificate to work, cut off the power before operation, and hang a warning sign that reads "Do not close";
·It is strictly prohibited to use packing pumps in media with a sand content greater than 0.01%, as sand particles will accelerate the wear of the shaft sleeve;
·All operations must comply with the mandatory requirements for the installation of long shaft pumps in GB/T 2816 and GB 50275;
·The packing type pump does not have an intelligent monitoring interface and must rely on manual inspection. It is recommended to develop an inspection checklist every 200 hours.