Adjustment method and precautions for installing methanol burner pump and valve with packing. The effective sealing of the methanol burner pump and valve depends on the overall condition of each component. Pay special attention to the equipment that needs to be replaced before packing. Effective isolation has been carried out in accordance with the site and system. The following is intended to guide service personnel, engineers, and assemblers to properly install and adjust packing.
1. The required tools require special tools, a methanol burner pump and a pre-tightening nut with a fastener when removing the old packing and replacing it with a new packing. In addition, standard safety facilities and related safety regulations must be used frequently. Before installation, first familiarize yourself with the following equipment: the cutting machine for the packing ring, the torque wrench or wrench, the safety helmet, the internal and external calipers, the lubricant of the fastener, the mirror, the packing extractor, and the cutting root. Tool, vernier caliper, etc. 2. Cleaning and inspection: Slowly loosen the gland nut of the stuffing box to release all residual pressure in the packing assembly; remove all old packing and thoroughly clean the packing box of the shaft/rod; check the shaft/ Whether the rod is corroded, dent, scratched or excessively worn; check other parts for burrs, cracks, and abrasion, which will reduce the life of the packing; check if the stuffing box has excessive clearance and the eccentricity of the shaft/rod Replace parts with larger defects; check old packings as a basis for failure analysis, Botaibang to find the cause of early failure of packing.
3. Measure and record the diameter of the shaft/rod, the pore size and depth of the stuffing box, and when using the oil seal ring, record the distance from the bottom of the stuffing box to the top.
4. Select packing: ensure that the selected packing should meet the operating conditions required by the system and equipment; calculate the cross-sectional area of ​​the packing and the number of packing rings required according to the measurement records; check the packing to ensure that it is free of defects. Make sure the equipment and packing are clean before installation.
5. Preparation of the packing ring: the braided packing is wound around the appropriate size of the shaft, the methanol burner pump or the calibrated packing ring cutter; the cutting of the packing is made in a mating (square) or Miter (30-45 degrees), cut a ring at a time, and check the size with a shaft or stem. Molded packing ensures that the ring fits precisely to the shaft or stem and, if necessary, cuts the packing ring according to the packing manufacturer's instructions or requirements.
6. Install the packing. Carefully install one packing ring at a time, and surround each ring around the shaft or valve stem. Before installing the next ring, the methanol burner pump should ensure that the ring is completely in place in the stuffing box. The next ring should be staggered, at least 90 degrees apart, and generally requires 120 degrees. After the top ring is installed, tighten the nut by hand and press the cover evenly. If there is an oil seal ring, check that it is at the correct distance from the top of the stuffing box. Also ensure that the shaft or stem is free to rotate.
7. Adjust the packing: continue to tighten the gland nut by hand with the packing of the methanol burner pump; after opening the pump, adjust the gland nut, and allow a little more leakage at this time; slowly tighten the gland nut to gradually reduce the leakage. Until the leak reaches an acceptable level; if the leak suddenly stops, re-tighten the cap nut and readjust it to prevent the packing from overheating; adjust the leak rate to a steady state. Consult the packing manufacturer or the technical department of the valve for the torque specification or compression percentage. Use the following procedure to tighten the gland nut: apply torque to the gland nut to 30% of full torque or the percentage of party compression; Repeat the valve several times. When the valve is in the closed position, apply all the torque; repeat step 3 or 4 times.
8. Retighten and replace. After several hours of operation, check the adjustment of the gland and tighten if necessary. When the gland cannot be further adjusted, the packing must be replaced.
1. The required tools require special tools, a methanol burner pump and a pre-tightening nut with a fastener when removing the old packing and replacing it with a new packing. In addition, standard safety facilities and related safety regulations must be used frequently. Before installation, first familiarize yourself with the following equipment: the cutting machine for the packing ring, the torque wrench or wrench, the safety helmet, the internal and external calipers, the lubricant of the fastener, the mirror, the packing extractor, and the cutting root. Tool, vernier caliper, etc. 2. Cleaning and inspection: Slowly loosen the gland nut of the stuffing box to release all residual pressure in the packing assembly; remove all old packing and thoroughly clean the packing box of the shaft/rod; check the shaft/ Whether the rod is corroded, dent, scratched or excessively worn; check other parts for burrs, cracks, and abrasion, which will reduce the life of the packing; check if the stuffing box has excessive clearance and the eccentricity of the shaft/rod Replace parts with larger defects; check old packings as a basis for failure analysis, Botaibang to find the cause of early failure of packing.
3. Measure and record the diameter of the shaft/rod, the pore size and depth of the stuffing box, and when using the oil seal ring, record the distance from the bottom of the stuffing box to the top.
4. Select packing: ensure that the selected packing should meet the operating conditions required by the system and equipment; calculate the cross-sectional area of ​​the packing and the number of packing rings required according to the measurement records; check the packing to ensure that it is free of defects. Make sure the equipment and packing are clean before installation.
5. Preparation of the packing ring: the braided packing is wound around the appropriate size of the shaft, the methanol burner pump or the calibrated packing ring cutter; the cutting of the packing is made in a mating (square) or Miter (30-45 degrees), cut a ring at a time, and check the size with a shaft or stem. Molded packing ensures that the ring fits precisely to the shaft or stem and, if necessary, cuts the packing ring according to the packing manufacturer's instructions or requirements.
6. Install the packing. Carefully install one packing ring at a time, and surround each ring around the shaft or valve stem. Before installing the next ring, the methanol burner pump should ensure that the ring is completely in place in the stuffing box. The next ring should be staggered, at least 90 degrees apart, and generally requires 120 degrees. After the top ring is installed, tighten the nut by hand and press the cover evenly. If there is an oil seal ring, check that it is at the correct distance from the top of the stuffing box. Also ensure that the shaft or stem is free to rotate.
7. Adjust the packing: continue to tighten the gland nut by hand with the packing of the methanol burner pump; after opening the pump, adjust the gland nut, and allow a little more leakage at this time; slowly tighten the gland nut to gradually reduce the leakage. Until the leak reaches an acceptable level; if the leak suddenly stops, re-tighten the cap nut and readjust it to prevent the packing from overheating; adjust the leak rate to a steady state. Consult the packing manufacturer or the technical department of the valve for the torque specification or compression percentage. Use the following procedure to tighten the gland nut: apply torque to the gland nut to 30% of full torque or the percentage of party compression; Repeat the valve several times. When the valve is in the closed position, apply all the torque; repeat step 3 or 4 times.
8. Retighten and replace. After several hours of operation, check the adjustment of the gland and tighten if necessary. When the gland cannot be further adjusted, the packing must be replaced.
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