Pump Packing Installation Instructions
Installation Instructions for Pump Packing
Extract all the used packing with packing tools, being careful not to harm the shaft/sleeve. This includes every ring, even the lantern ring and the rings below the lantern.
Clean the stuffing box and check the shaft/sleeve. If scarred or deeply grooved, change worn parts. Gauge and record shaft diameter, stuffing box bore and box depth.
To resolve the correct packing size, measure the size of the shaft and the stuffing box bore. Subtract the shaft diameter from the bore diameter and divide the difference by two. This is the necessary cross-sectional size. Always cut the packing into individual rings. Never wind the packing into a coil in the stuffing box.
Rings should be cut with a butt joint. Cut rings by using a mandrel with the same size as the shaft in the stuffing box area. If there is no wear, rings can be cut on the shaft outside the stuffing box. Hold the packing tightly on the mandrel, but do not stretch excessively. Cut the ring and insert it into the stuffing box, making certain that it fits the packing space properly. Each additional ring can be cut in the same manner.
Install one ring at a time. Make sure it is clean, and has not picked up any dirt in handling. Lubricate the I.D. of each ring lightly. Install one end and then the other, butted closely. Work around circumference from either or both directions. Joints of successive rings should be staggered and kept at least 90° apart. Each individual ring should be firmly seated with a tamping tool.
When enough rings have been independently seated so that the nose of the gland follower will reach them, individual tamping should be completed by the gland. If a lantern ring is used, make sure the lantern ring is installed under the gland tap hole. After the last ring is inplace, bring the follower down on the packing and finger-tighten the plate nuts.
Do not force the packing by excessive gland loading. Start pump, and tighten the nuts until leakage is reduced to a acceptable minimum. Make sure gland bolts are evenly tightened . Stopping leakage completly at this point will cause the packing to burn up.
Allow packing to leak freely upon startup after repack. Gradually, cut leakage during the first hour of use will result in a better seal over a greater period of time. Tighten the gland nuts one flat at a time until the desired leakage is obtained, and the pump is running smooth.