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        DONDE SEAL

        CHINA

        Professional Of Mechanical Packing & Industrial Gasket

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        Causes of packing failure

        In addition to the impact that improper packing material selection can have on both packing and pump performance, two other areas can contribute to packing failure. One is improper installation of the packing, the other is faulty pump equipment. To determine which factor is the cause of packing failure, look for clues in the old packing. If the packing you've removed is thinner in one area of the inside surface, then the shaft is improperly aligned. If there is raggedness or shredding on the inside surface, you'll probably also find chipping or burrs on the shaft sleeve. When the old packing has become hard or abrasive, it's an indication that either the wrong packing material was used, or the stuffing box is worn, (pores are damaged or clogged), causing the gland water to flow outside the packing rings and not cool them properly.

        If one or more rings are missing, or if there is partial extrusion of the inside ring, you have too much throat clearance and you'll need to install a bull ring or anti-extrusion ring. On the other hand, if the outside ring shows evidence of extrusion between the shaft and the follower, there is too much gland follower clearance. This can be corrected with the installation of a bushing or by reducing the gland pressure to reduce the gap. A careful analysis of the old rings and inspection of the stuffing box and shaft sleeve should tell you what is causing your packing to fail prematurely.>>The End

        浙ICP備09001215   Copyright:CIXI ZONDE SEALING & GASKET CO.,LTD.
        Address:Ximenwai Industrial District,Longshan Town,Cixi,Ningbo City,China.
        Tel:+86-574-63787875, 63787080 Fax:+86-574-63787241 
        E-mail: mgr@chinaseal.cn; wangbo@chinaseal.cn
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