High Quality 6808 Other customized bearings Export to India

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  • In this video Dr. Lyle Branagan, Engineering Manager at Pioneer Motor Bearing Co., discusses the results of ultrasonic testing (UT) of the babbitt/steel bond on a large hydro guide bearing. For more information please go to http://www.pioneer1.com or call us today (704) 937-7000. Or send us an email at engineering@pioneer1.com or sales@pioneer1.com

    Video Transcript:
    An ultrasonic (or UT) examination reveals areas of broken bond between the babbitt and the steel UT examination can be made based on ISO 4386-1 standards, DOD Std 2183, or a proprietary standard derived from these.

    Note that this bearing has dovetails Dovetails weaken the bond between the babbitt and the steel Dovetails create difficulties for UT examination along the thickness transitions

    Note that the regions where broken bonds have been detected are marked with red cross-hatching Regions of broken bonds are seen along the edges of the bearing The criteria for acceptable UT results are more strict along the edges of the bearing as broken bonds in these regions are expected to be more susceptible to growing with continued operation Regions of broken bonds are also seen in the central regions of the babbitt, away from the edges and away from the oil distribution grooving

    A dye penetrant testing (or PT) examination was made along the interface between the babbitt and the steel on the axial edges and along the joint faces PT examination can be made based on ISO 4386-3 or a related proprietary standard In this case with large regions of disbond, results of the PT testing are summarized as the percentage of length showing PT indications compared with the total tested length

    Pioneer relies on UT examination to determine whether a bond of a new or used bearing is acceptable The bond of this bearing is clearly unacceptable

    Pioneer recognizes that PT examination of used or refurbished bearings can display regions of “false positives” False positive regions show PT indications but the bond has good integrity To provide a more sure evaluation, regions of PT indications should be retested with a more detailed UT examination A smaller diameter UT probe will allow testing closer to the edge Note that in the presence of a large radius on the edge of the babbitt, this retesting may not be feasible Should the UT examination show areas of disbonding, then these should be marked Should the more detailed UT examination not show evidence of disbonding, the PT indications are categorized as “false positives” After years of service, and possibly aggravated by the presence of dovetails, the bond between this babbitt and the steel shell is unacceptable. The next step for this bearing is re-casting.

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    About Pioneer Motor Bearing Co.
    Founded in 1920, Pioneer Motor Bearing Company is one of the leading U.S. firms engaged in engineering design, manufacturing, service and repair of fluid film babbitt (whitemetal) bearings and seals, primarily for the power generation industry. Pioneer is widely considered the experts in babbitt bearing repair. Pioneer offers original equipment manufacturers (OEMs) of large rotating machinery and end- users of fluid film journal and thrust bearings and babbitt seals a full spectrum of capabilities:
    • Manufacturing to the designs of our OEM customers or to Pioneer designs.
    • Specialized bearing engineering services (design development for OEMs).
    • Technical services, on site at power plants, serving as bearing specialists, assisting OEM and/or power plant technical personnel.
    • Repairs, refurbishment and upgrades (standard and emergency) including standard rebabbitting.
    • Bearing damage mechanism analysis.
    • Bearing engineering “trouble-shooting” (solving operational problems, such as over heating, etc.).

    ALSTOM (Now G.E.)
    Since 1990, Pioneer has supplied new Alstom-designed bearings to Alstom Power Service (Midlothian, Virginia, U.S.), now under the G.E. umbrella, often on short lead times to meet the requirements of power plant outage schedules. In addition, since 1993 Pioneer has been the exclusive bearing repair licensee of Alstom Power in the U.S. (and its antecedent, ABB Power Generation, Inc.). Pioneer is very familiar with Alstom bearing designs, material specifications and quality assurance requirements.

    SIEMENS
    Pioneer has been a qualified supplier to Siemens Power Generation in the U.S. (and its antecedent, the Power Generation Business Unit of Westinghouse Electric Corporation) since 1974. In fact, from 1989 to 1995, Pioneer was the exclusive supplier to Westinghouse of all new Westinghouse-designed babbitted bearings. Pioneer was the first and still is the senior bearing repair licensee of Siemens Power Generation (since 1983). Our relationship as a qualified supplier to both Westinghouse Electric and General Electric marine divisions began in 1956.

    After the signing of the contract, we received satisfactory goods in a short term, this is a commendable manufacturer.
    5 Stars By Geraldine from Iraq - 2015.05.15 10:52
    The company has rich resources, advanced machinery, experienced workers and excellent services, hope you keep improving and perfecting your products and service, wish you better!
    5 Stars By Cherry from Pakistan - 2015.12.30 10:21
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