Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

From the nuclear regulatory commission - RE: ULSD

Discussion in '1982-Present GM Diesel' started by 4by4bygod, Mar 23, 2007.

  1. 4by4bygod

    4by4bygod 1/2 ton status

    Joined:
    Nov 13, 2003
    Posts:
    3,859
    Likes Received:
    0
    Location:
    With My Tinfoil Hat

    I don't know if anyone here has seen this yet.. it's a bulletin from the nuclear regulatory commission describing the issues arising from ULSD fuel.

    This was released just last fall.

    www.nrc.gov/reading-rm/doc-collections/gen-comm/info-notices/2006/in200622.pdf

    Some excerpts:

    There are several diesel fuel properties other than sulfur concentration that change as a result of moving to ULSD that may adversely effect the engine performance including:

    Energy Content

    In general, the processing required to reduce sulfur to 15 ppm also reduces the aromatics content and density of diesel fuel, resulting in a reduction in volumetric energy content (BTU/gallon).

    The expected reduction in energy content is 1.2 percent or more. Less energy content of the fuel can reduce the instantaneous output rating of the diesel engine. The reduced output rating may be less than the value specified in the plant’s design andlicensing basis, potentially rendering the diesel inoperable.

    The reduced energy capacity of the ULSD may result in increased fuel consumption such that the onsite diesel fuel storage capacity for the emergency diesel generators may be insufficient to satisfy the plant’s design and licensing basis for diesel operation duration before offsite
    replenishment is needed.

    The reduced energy capacity may also lengthen the amount of time needed for the emergency diesel generators to reach the required speed and voltage.

    ( We've seen much greater energy losses from the use of ULSD in the field than 1%...total energy loss depends on the API gravity of the fuel, but that's another discussion.)

    Here's more:


    Fuel Particulate Build-up Increases

    Additives to increase lubricity and to inhibit corrosion used by different refineries and wholesale suppliers can react or become unstable in storage, which can result in increased fuel particulates that may foul or plug filters and fuel injection equipment, and can affect suitability of some testing methods. Some nuclear plant licensees using ULSD have observed an increase in the rate of particulate buildup in samples from their diesel fuel oil storage tanks.

    -end excerpt-

    Thought you'd like to know.. It's good to see our government so confident in the materials they mandate, isn't it? and here we thought the refineries had all the answers.

    anyway, we're stuck with it, but at least you're more informed about what's going on out there.

    Tom





     
  2. imiceman44

    imiceman44 1 ton status

    Joined:
    Aug 5, 2002
    Posts:
    15,160
    Likes Received:
    1
    Location:
    Sacramento, CA
    Yeah if it was only 1.2% they wouldn't have mentionned a problem with the storage capacity, I mean if their storage is right on the money and they don't have a margin of security to cover 1.2% increase, that is bad.
    That leads me to believe it's closer to 12% or more to be concerned.
    Anyway like you said we're stuck with it and we'll have to deal with it.
     
  3. 4by4bygod

    4by4bygod 1/2 ton status

    Joined:
    Nov 13, 2003
    Posts:
    3,859
    Likes Received:
    0
    Location:
    With My Tinfoil Hat
    yes, 10 - 12% is generally what we are hearing about.. our customers of course fare much better..not like the good old days of high sulfur fuel, but we keep the energy losses to a minimum nonetheless..
     

Share This Page