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Peter J Stewart-Hay


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Peter J Stewart-Hay


About Me

Personal Information

About me
A university trained Professional Mechanical Engineer, registered in the Province of Ontario, Canada.

A wire and cable manufacturing engineering specialist with over 35 years hands on experience.

Company Information

Stewart-Hay Associates
Unit 51, 1814 Shore Road
London, Ontario Canada
N6K 0C6
City / Town
Land phone
519 6413212


College / University
U of M
Graduation Year
B Sc. M.E.
Skills and Expertise
A university trained Professional Mechanical Engineer, registered in the Province of Ontario, Canada.

A wire and cable manufacturing engineering specialist with over 35 years hands on experience.

Recent activities

  • Peter J Stewart-Hay replied to the topic 'Aluminum clad steel' in the forum.
    Hello again Brian,

    Ok and as I understand it now,

    - The 1060 steel wire and the molten 1350 Aluminum cladding are brought together on a continuous casting line and then rolled to a final diameter before quenching.
    - After spooling, and after the first few reels of production, the diameter of the composite conductor reduces by a measurable amount.
    - By microscopic measurement, it has been found that the aluminum alloy cladding has been reduced but that the steel wire diameter remained unchanged.

    We can only presume that the damaged aluminum alloy cladding is regrowing its crystal structure to eliminate many of the molecular grain discontinuities and gain fractures. This could be reducing the thickness of the cladding material. Moreover we note that, after running for a period of time, the composite wire on the take up reel could be warmer and thus crystal regrowth of the aluminum alloy happens at a faster rate.

    We suggest you contact the metallurgical engineering faculty at your nearest engineering campus. Once you have an appointment, meet with a metallurgist and show him both your typical samples showing the shrinkage that has occurred. Likewise he must understand your full process.

    Note - Because we cannot see your production line, we not sure of exactly what is occurring.
    Read More... 10 hours ago
  • kunena.thankyou 21 hours ago
  • Peter J Stewart-Hay replied to the topic 'Aluminum clad steel' in the forum.
    Hello Brian,

    Wow, that is very interesting.

    I presume this has confirmed by you by direct and precise measurement.

    In order to shrink pre-stressed steel, you require lots of heat. This apparently happens during the cladding process but we have no information on your process or the the steel you are using. Not sure how the cladded material gets formed into a tube and perhaps welded. We certainly have a serious lack of information.

    Please provide us with the rest of your information
    Read More... 1 day ago
  • The conductor screen is made from XLPE and is semi-conducting in nature by the addition of carbon.. The compound can be super-smooth by having the carbon produced by burning acetylene as this gives a very small sized particulate.

    The conductor screen has two basic functions.

    (1) ]To mechanically protect the insulation from the conductor.. This prevents stress concentrations at the conductor surface of the insulation.

    (2) Because polyethylene has a larger thermal coefficient of expansion than the conductors, it will expand away from the conductor. Because the conductor screen is at the same potential as the conductor, there cannot be a flashover.

    The conductor screen and the insulation screen are simultaneously extruded with the insulation.
    Read More... 2 days ago
  • friends Miss Choe - - and Peter J Stewart-Hay are now friends
  • We received this by E-mail and have placed a copy here.

    Hello Sir,

    I would like to find more information regarding conductor screen for Triple extrution - 11KV power cable.

    Read More... 3 days ago
  • Peter J Stewart-Hay replied to the topic 'Wafios Coiler' in the forum.
    Hello Pete,

    My that coiler seems to be in really rough shape. Try thhis web page and note that the State can be changed so you may find a repair facility closer to home. Also remember that fortunately Wafios has a facility in the USA so that some replacement parts can be ordered

    Kindest regards,
    Read More... 4 days ago