The effective sealing of high-pressured residue pumps and valves depends on the overall condition of the individual components. Special attention must be paid to the fact that Postel is convinced that the equipment needed to replace the packing has been effectively isolated on site and in the system prior to packing. The following is used to guide the maintenance staff, engineers and assemblers to properly install and adjust the packing. 1, the tools needed in the removal of the old packing root need to use a special tool, high pressure residue pump and pre-tighten the gland nut with a fastener. In addition, regular safety equipment and compliance with relevant safety regulations are required. Prior to installation, first familiarize yourself with the following equipment: Cutter to verify the packing ring, calibrate the torque wrench or wrench, helmet, internal and external calipers, fasteners lubricants, mirrors, pan picker, Tools, vernier caliper and so on 2, cleaning and inspection 1) Slowly loosen the gland nut of the stuffing box to release all the residual pressure in the packing assembly; 2) Remove all old packing and thoroughly clean shaft / rod stuffing box; 3) Check shaft / rod for corrosion, dents, scratches or excessive wear; 4) Check other parts for burrs, cracks, wear, they will reduce the life of the packing; 5) Check packing box for excessive clearance and eccentricity of shaft / rod; 6) replacement of a larger defect parts; 7) Check the old packing as a basis for failure analysis to find out the reasons for the early failure of the packing. 3. Measure and record the diameter of the recording shaft / rod, the diameter and depth of the stuffing box, and record the distance between the bottom of the stuffing box and the top when sealing the water. 4, choose packing 1) to ensure that the selected packing should meet the system and equipment requirements operating conditions; 2) Based on the measurement records, calculate the packing cross-sectional area and the number of packing rings required; 3) Check the packing, to ensure that its defect-free; 4) Before installation, make sure the equipment and packing are clean. 5, packing ring preparation 1) Braid packing Wrap the packing on the shaft of the proper size, or use a calibrated packing ring cutter; cut the packing neatly (square) or miter (30-45 degrees) clean once and for all at once Cut a ring and inspect the shaft or stem for proper dimensions. 2) Molded packing Make sure that the ring is exactly sized to the shaft or stem, and cut the packing rings if necessary, according to the packing manufacturer's operating instructions or requirements. 6. Install Packing Be careful to install one packing ring each time, enclose each ring around the shaft or stem. Before installing the next ring, make sure the ring is fully seated in the stuffing box and the next ring Should be staggered, at least 90 degrees apart, the general requirements of 120 degrees. After the last ring is installed, the high-pressure residue pump is tightened by hand and pressed down evenly. If there is a water seal, check that it is at the correct distance from the top of the stuffing box. At the same time to ensure that the shaft or stem can rotate freely. 7, high-pressure residue pump to adjust the packing 1) Pump packing (1) Continue to tighten the gland nut by hand; (2) After opening the pump, adjust the gland nut, at this time allow a little more leakage; (3) Slowly tighten the gland nut to gradually reduce the leakage until the leakage reaches an acceptable level. (4) If the leakage suddenly stops, screw the gland nuts back and adjust to prevent overheating of the packing. (5) adjust the leakage rate to a steady state can be. 2) Valve Packing Use the packing manufacturer or your company's technical department for torque specifications or percentage compression. Tighten the gland nuts as follows: (1) Apply torque to the gland nut to 30% of full torque or the party's compression percentage; (2) repeatedly open and close the valve several times, when the valve is in the closed position, exert all the torque; (3) Repeat step (2) 3 or 4 times. 8. Fastened and replaced again After a few hours of operation, the autoclave pump checks the condition of the gland and tightens if necessary. When the gland can not be further adjusted, the packing must be replaced.
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