Understanding Canned Motor Pumps | 合法醫療器材資訊網
EP Editorial Staff | September 1, 2008
Of course, volumes have been written as to why pumps fail. Also, it is no stretch to assert that, when pump fires result from such failures, a mechanical seal is usually involved (Fig. 1).
Mechanical seals often fail as a consequence of prior bearing distress. In some instances, seal manufacturers supply products with close clearances between the periphery of rotating seal parts and the diameter (bore) of stationary seal parts. We believe that users should specify seals for hydrocarbon products to comply with API (American Petroleum Industry) Standards. We also believe that deviations from the user’s specification or applicable guidelines (such as API-682) should be brought to the purchaser’s attention.
There are, however, other ways to avoid seal failures. One...
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