Stay informed with Excellence in Practice. SeccoMix R For top, side and bottom entry drives Dry running Nitrogen pressurized dual seal Rotating seat at product side Balanced Independent of direction of rotation. Mechanical seals for pumps Mechanical sealsseal supply systems, magnetic couplings, carbon floating ring seals, expansion joints, gaskets and packings as well as comprehensive services are used wherever reliability and safety are needed. Contact our experts for more information.
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Packings are available in standard sizes 3 to 25 mm. Other shapes or sizes on request. Packing installation The ideal way to pack a stuffing box is with dieformed rings. Also precut lengths or self cut lengths can be used. If cutting lengths from a creel a packing cutter can be used. By wrapping the cut packing around the shaft or spindle it can be checked if the length is correct.
Alternatively the packing can be directly wound around the shaft from the creel and cut accordingly. A diagonal cut helps to produce a better sealing effect than a straight cut. When cutting packings which tend to fray adhesive tape should be placed on appropriate side of the area to be cut, prior to cutting, in order to prevent fraying.
Install each ring into the stuffing box, ensuring the ends are placed together and inserted first followed by the rest of the ring. The packing set should initially be tightly compressed, so that it will mould and seat itself into the stuffing box. The gland nut should then be lossened and retightened to an appropriate setting. Installing die-formed rings Dieformed rings with exact dimensions should be handled with care in order to retain the advantages that these rings offer.
If the rings have to be opened to fit onto the shaft then the ring ends should only be opened axially so far that the ring will fit over the shaft. Bending the ring radially deforms the ring and makes installation more difficult. Pre-compression of packings The correct compression of packing set is dependent of the type of packing and application. If a torque wrench or a similar tool is available the necessary gland pressure can be adjusted precisely. Pre-compression for pumps Pump packings should be compressed with a gland pressure of 1.
A minimum compression of 0. Pre-compression for valves Valve packings should be compressed with a gland pressure of 2 to 5 times the media pressure. A minimum compression of 5 MPa is necessary. If the packing is running dry it will get too hot and the pump must be stopped. After a short cooling down period a regular leakage drip should appear and the pump can be restarted. It may be necessary to repeat this procedure several times until regular leakage appears. The permissible eccentricity on centrifugal pumps should be less than 0.
In the interest of reduced leakage the eccentricity must not exceed 0. The permissible extrusion gaps between shaft and gland or housing are 0. If the gaps are larger or the packing in question is inclined to extrude, suitable anti-extrusion rings should be fitted.
Burgmann Type M7
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