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15 May 2013:
Concrete vs. Steel
LGMI R
As we have stated previously, we are going to be taking the ideas developed in this column over the last couple of years and developing them into design practices.  This is how it works.  We will provide the basic narrative here for one design practice each week.  We will keep it open for comments for one month.  After that, we will finish it in formal form and offer it for sale at a modest price.  Here is where you come in.  If you make a substantive contribution to a standard, the organization for which you work will be granted a pro bono license to use that standard with its current issue number for as long as you like.  We have had good response so far!  Contribute, please.

This week's:
Concrete vs. Steel (LGM 2013.019.01
when issued)

Reference:

 

When you can't think of anything else to lighten, think of substitution.     

 

An example: twenty-five years ago, interstate overpasses were competitively bid in steel and precast concrete designs. Today, precast concrete has taken over this sector of construction.  

 

Objective:

 

To use concrete as an alternative to steel, as it may be less expensive. 

  

So, give us your comments by 11 June 13, please!

Still open for comments: Heat Transfer Fluids (Open until 4 June 13)

Still open for comments: Vacuum Blowers (Open until 28 May 13)

Still open for comments: Grating Mezzanines (Open until 21 May 13)

  
As always, your comments will be appreciated.
Think light!

 

Brian Brogdon, Ph.D.
Executive Director

 

or

 

Jim Thompson
Founder
_____
LGMI FEEDBACK
Regarding Heat Transfer Fluids
Jim,

Converting PM dryers to HTF heating is not really a new idea, but certainly worth considering, especially if combined with steel dryers replacing cast iron dryers.

 

From a property protection view, there is a significant fire hazard increase at the machine. This increase can be addressed by providing curbs & drains to contain spills, controls to stop the HTF systems upon leakage and additional automatic sprinkler protection.

 

Fire protection of the HTF heating and supply system is also needed while steam heating needs none.

 

Many paper machines now have in-line HTF heated calendars, so there is some experience with the increased fire hazard. In 1999 a mill in Muskegon MI had a HTF calendar fire that was moderately well contained. I believe the fire resulted from a broken rotary joint. About the same time a mill in Maine had some experience with HTF fire on paper machine.

 

FM Global has engineered responses to the HTF hazard. I've linked a copy of our Data Sheet 7-4, Paper Machines and Pulp Dryers, which can be downloaded for free at www.fmglobal.com. I've also linked a copy of  Data Sheet 7-99, Heat Transfer by Organic and Synthetic Fluids.

 

I've linked a copy of the USFA report on a carpet manufacturing plant fire that resulted from HTF rotary joint failure. This one was not well protected.

 

Regards,

Dave Parrish

Send us your comments by emailing Brian Brogdon
or Jim Thompson!

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Disclaimer

 

LGMI Weekly Ideas are presented for your consideration and inspiration only.  It is solely your responsibility to check for engineering correctness, applicability, standards, insurance policy and local, national or any other legal compliance required before implementing.  Neither The Light Green Machine (TM) Institute, Paperitalo Publications, Talo Analytic International, Inc., nor any individual associated with these entities accepts any responsibility for your application or compliance issues.

 
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