[Steam-engine] lap seam boiler pressure

[JEFF LUND]

Ken, They may want to waste money aimlessly in this
state and can't agree on how to do it, the boiler
inspectors are still working I talked to them
yesterday.

Just for a little clarification,  when you hydro test
your water temperature needs to be a minimum 60 deg F,
and a max of 120.   The pressure according to NBIC can
be anywhere from 90% to 150%. (It depends on the
paragraph your are reading and what you are doing to
the boiler.)

Jeff Lund
Lund Machine Works

--- Ken Majeski <fuller_johnson1 at msn.com> wrote:

> Lawrence.... I have No Problem whatsoever with using
> 4. Where the problem is 
> is that they state on their website and even in the
> proposed New Rules that 
> they use 5 and 6. After all what good is a SF of 5
> or 6 on the barrel when 
> the firebox is 4.
> 
> A couple years ago our inspectors said Minnesota
> used 5 and 6 and they were 
> going to do the same. Just figure out what the MAWP
> would be if you used 6 
> on stayed surfaces. It took a Lot of Effort on our
> part to get this 
> clarified and straightened out. Finally your chief
> admitted they used the 
> 13800 figure or the SF of 4 which is almost the
> same....
> 
> Whatever SF you use it should either be the same or
> should be stated as 
> cylindrical VS stayed surfaces.... Other people and
> states are looking at 
> your regulations all the time and the 5 or 6 figure
> is simply misleading to 
> say the least...
> 
> We Should be working to get all states the same but
> the way things are going 
> we seem to be drifting farther apart...
> 
> Who ever heard of shutting the state services down
> because they can't agree 
> on a budget???? Seems strange but it is happening
> over there now.... I geuss 
> we should consider any boiler rules at all a
> Miracle... :)
> 
> Ken Majeski, Ellsworth Wis. Case Steam Engine, 
> Rumely Oilpulls H, F, & R. 
> Website, Http://www.pressenter.com/~kmajeski/
> 
> 
> 
> 
> >From: "Lawrence Swanz" <LSwanz at superioriron.com>
> >Reply-To: Steam-engine mailing list 
> ><steam-engine at lists.stationary-engine.com>
> >To: "Steam-engine mailing list"
> <steam-engine at lists.stationary-engine.com>
> >Subject: RE: [Steam-engine] lap seam boiler
> pressure
> >Date: Fri, 8 Jul 2005 11:29:30 -0500
> >
> >Ken,
> >
> >You stated, "Also I have issues with the Minnesota
> safety factor. They 
> >state they use 5 for code or 6 for non code and
> they clearly use a SF of 4 
> >on the stayed surfaces. That almost got us in
> trouble when the inspectors 
> >were confiring a couple years ago...."; You may
> have a problem with 
> >Minnesota using a factor of safety of 4 for stayed
> surfaces, or a hard 
> >number of 13,800.  But this is a number, that until
> late, A.S.M.E. used in 
> >the formula for figuring design for stayed
> surfaces.  A few years ago 
> >however, A.S.M.E. changed this to 15,800 or roughly
> a factor of safety of 
> >3.5.  So, for those who are building new boilers,
> the boiler industry is 
> >and will be using the current A.S.M.E. formulas. 
> With this in mind, a 
> >boiler designed for 150 lbs., assuming they
> lightened the boiler plate to 
> >its thinnest material instead of the standard .375"
> thickness that we 
> >hobbyist like to see; then it is possible for a
> brand new boiler to 
> >automatically have a reduced pressure by the
> assumption!
> >   that we should be using a factor of 5 for code
> boilers.  This is why I 
> >believe Minnesota uses the 13,800 or factor 4 in
> its formula.  By the way, 
> >does anyone know when the last boiler in Minnesota
> ruptured as a result of 
> >thinning due to over pressurizing by utilizing this
> methodology in its 
> >stayed surface formula? or any boiler in Minnesota
> for that matter?  I 
> >believe in operating these relics safely, but I
> also believe in that if the 
> >metal is there, then let it run, and if it isn't
> repair or replace.  But 
> >don't over precaution, let's be realistic about it.
> >
> >Lawrence
> >
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>
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> 
> 
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