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Thread: Wear of Venturis

  1. #1
    Alwinn Jones Guest

    Wear of venturis

    We are using cast Ni-hard venturis to pneumatically convey abrasive aggregates. The venturis have a 6" tee feed for the aggregate and a 1.5" bore air injector nozzle. Wear is occurring at the reduced bore of the venturi and conveying efficiency reduces as the bore of the venturi wears.

    Could ceramics be used to improve the working life of the venturis and are there other wear resistant materials that would do a job for us?

    Thanks,

    Allwyn

  2. Hi Allwyn,

    Eductors are manufactured in various materials. The most wear resistant units use an engineering grade reaction bonded silicon carbide liner to resist wear. 95% alumina ceramic is probably the next most cost effective lining materials. I have attached a drawing of an alumina ceramic lined eductor to show how it is constructed; the red hatching is the alumina ceramic lining. The ceramic lining is constructed in a number of parts, which can be individually replaced when the amount of wear becomes unacceptable.

    Generally speaking, a decent quality 95% alumina ceramic lining should give between 5 and 10 times the wear life of a cast Ni-hard alternative, thickness for thickness. A good quality engineering grade reaction bonded silicon carbide can out perform cast Ni-hard by up to 100 times, in certain wear applications.

    Regards,.

    Mike
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #3

    The Where in WEAR

    Alwinn this is something we have been doing for several years with a high level of success.
    We have a proprietary ceramic product unlike most in the fact it will not peel or chip.
    If you send me your email address I can send you some photo's as well as other applications .
    Pumps, pulley lagging, fans etc.
    Regards
    Brian Herchenrader
    www.wearsolutions.com

  4. We provide wear resistance solution of many wearing components without failure against severe abrasive attack and abnormal loading condition in raw material handling by fixing laminated plate or bar of Chrome Molybdenum white iron with Chromium 14 to 18%and Molybdenum 2.5 to 3.5 %, metallurgical bonded to a mild steel backing plate. The bond joint is strong metallurgical bond with > 33,00 psi making the steel plate an integral part of the white cast iron and it is heat resistance at 800 F (425 C) continuous with no negative effects on the iron. The mild steel backer plate not only provides weld-ability for ready attachment but the most importantly, it provides impact resistance and backing plate does not transform the white iron component into malleable form, but through the bond, it supports the iron in place. The metallurgical bond provides fail-safe characteristics, which enables continued use even after fracture due to abnormal loading. The chrome Molybdenum white iron wear layer, in thickness up to 2 inches, is completely through hardened (i.e. no soft center or back) in the heat treatment process, to a hardness of 700 Brinell, 64 Rockwell C.

    We shall to be pleased discuss further after hearing from you through E.mail.

  5. #5
    Ken Tuckey Guest

    WEAR OF VENTURIS

    Hi Alwinn,

    we have manufactured venturis for applications with high wear rates and have achieved successes with our dense alumina ceramics.

    Drawings will help and more info on the application.

    Please contact me on my email as below,

    regards

  6. #6
    Marco Aurelio Flores-Verdugo

    Marco Aurelio Flores-Verdugo

    Consultant

    Tecmen S.A. de C.V.

    Tecmen S.A. de C.V.

    Professional Experience 3 Years / 4 Month Marco Aurelio Flores-Verdugo has 3 Years and 4 Month professional experience

    Discussions 280 Marco Aurelio Flores-Verdugo acceded to 280 discussions, Articles 0 Marco Aurelio Flores-Verdugo wrote 0 articles, Publications 0 Marco Aurelio Flores-Verdugo Flores-Verdugo released 0 publications

    Searching nothing specified

    Know-How Design (142) Marco Aurelio Flores-Verdugo used this tag 142 times, Pneumatic Conveying (80) Marco Aurelio Flores-Verdugo used this tag 80 times, Training (15) Marco Aurelio Flores-Verdugo used this tag 15 times

    WEAR RESISTING ALLOY .

    THERE ARE MANY ALTERNATIVES CERAMICS IS ONE , OR YOU MIGHT USE OUR ALLOY DESIGNED TO COMPETE WITH cHROME CARBIDE WELDED OVERLAYS , AT AFRACTION OF THE COST.

    I CAN SEND YOU MORE DATA IF YOU ARE STLL INTERESTED.
    tHE ALLOY WAS DESIGNED TO OPPERATE FRON FREEZING TO 650 CENTIGRADES IN PNEUNATIC CONVEYIMG.


    rEGARDS

    MARCO FLORES
    TECMEN
    Consultant in:
    Sponge Iron (DRI) handling
    Sponge Iron DRI Automated Storage Firefighting and Root Cause Analysis
    Pneumatic Conveying Consultants
    Phone 5281 8300 4456.

  7. Hi Allwyn,

    We can give solution to your problem with High Alumina i.e. 90% Alumina material having hardness in the range of 1500 to 2000 HV It is most technoeconomy solution and last nearly 4- 8 times to that of Nihard.

    For futher detail you may visit our site www.hofmannindia.com

    You may send your detail requirmen to our address

    Sunil Kapasi
    Director
    Hofmann Engg. & Mktg. P. Ltd.
    Wear Resitant Technology Division,
    307, Shubham Complex, Vastrapur,
    Ahmadabad-380054, Gujarat, India.
    email: sunil@hofmannindia.com
    sunil

  8. #8
    Marco Aurelio Flores-Verdugo

    Marco Aurelio Flores-Verdugo

    Consultant

    Tecmen S.A. de C.V.

    Tecmen S.A. de C.V.

    Professional Experience 3 Years / 4 Month Marco Aurelio Flores-Verdugo has 3 Years and 4 Month professional experience

    Discussions 280 Marco Aurelio Flores-Verdugo acceded to 280 discussions, Articles 0 Marco Aurelio Flores-Verdugo wrote 0 articles, Publications 0 Marco Aurelio Flores-Verdugo Flores-Verdugo released 0 publications

    Searching nothing specified

    Know-How Design (142) Marco Aurelio Flores-Verdugo used this tag 142 times, Pneumatic Conveying (80) Marco Aurelio Flores-Verdugo used this tag 80 times, Training (15) Marco Aurelio Flores-Verdugo used this tag 15 times

    wear in ventury

    Alumina or SiC will do a good job.

    chrome carbide allloys will do well to or even better under impact conditions .

    If you are interested in a high life to cost solution just reply to this post.

    Marco
    TECMEN
    Consultant in:
    Sponge Iron (DRI) handling
    Sponge Iron DRI Automated Storage Firefighting and Root Cause Analysis
    Pneumatic Conveying Consultants
    Phone 5281 8300 4456.

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