(This does not apply to valves) After starting the pump, allow it to run with a steady leakage for the first 15 minutes. Then begin to adjust the gland-nuts equally, one or two flats at a time, about 10 minutes between adjustments, until the leakage is reduced to an acceptable level. If during the procedure the gland begins to overheat, slacken off the gland nuts slightly to increase the leakage rate, thus reducing gland temperature. Commence re-tightening again after a further 5 - 10 minutes.
N.B.: Some leakage from the gland should always be maintained (approx. 10 drops/min.) to ensure adequate lubrication and cool running the packing.
When gland leakage is not permissible or when handling fluids contain abrasive substance in suspension, it is a normal practice to introduce a "fluid or liquid seal". This is achieved by feeding more acceptable fluid into the stuffing box by the use of a lantern ring. Regular maintenance should ensure that the lantern ring is correctly positioned and that the lubricant feed pipe is clear of obstruction.