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steam pressure conversion

steam pressure conversion

steam pressure conversion

(OP)
How can I determine the pressure of a steam that is given in an old book as  e.g.

  steam 80# ga

What does 80# mean?
What conversion factor is  necessary to convert it into bar or Pascal?

Thanks

Andreas

RE: steam pressure conversion

80# steam, is steam at 80 psig. to convert to bar use normal comversion factors from psig to barg.

"Scientists dream about doing great things. Engineers do them." -James Michener

RE: steam pressure conversion

Wow, does that question (and answer) make me feel old.

One of our esteemed forum members KATMAR has a freeware that is sweet for doing conversions.  Visit him at www.katmarsoftware.com for a free download.

rmw

RE: steam pressure conversion

Thanks for the link rmw.

"Scientists dream about doing great things. Engineers do them." -James Michener

RE: steam pressure conversion

I believe the ga stands for gauge pressure as opposed to absolute pressure.

RE: steam pressure conversion

A little deviation from original post.

I often encountered refinery steam line marked as 50 pound steam. General speaking, Does it mean gauge pressure(50psig) or absolute pressure(50psia)?

Thanks.

Yung

 

RE: steam pressure conversion

In my experience, if a pressure is not labeled as either gauge or absolute then the chances are that it is a gauge pressure.  Especially in an in-plant situation.

The only exception is that when a pressure is given in mmHg (millimeters of mercury) then it is usually an absolute pressure.  I guess this is because it is usually chemists or physicists who use this unit of pressure and scientific (as opposed to engineering) work generally concerns absolute pressures.  Perhaps the unit "atmospheres" falls in the same category.

Of course there are exceptions to these common practices and we should always try to label our pressures as gauge or absolute to remove the doubt.

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

RE: steam pressure conversion

To add to KATMAR's explanation....

Consider the circumstances.....if you are looking at a PID for a process chem plant steam system, "50 pound" steam is only really interesting (or relevant) when the units are in psig.

Lab settings or vacuum systems....possibly different.

-MJC

   

RE: steam pressure conversion

Also - Or more relevant, mm HG (millimeters mercury) or inches of water (both are traditional US standards) are very often used with vacuum systems or low pressures that cross atmospheric and vacuum systems like condensers or low head pump suctions.  

Knowing absolute pressures at these low values is critical.

At a 950 psi steam, or in a 4500 psi gas line, the 14.7 atmospheric pressure to gage pressure conversion is (almost always) "assumed" to be made: the gage is always needed to reference gage pressure.  That is, psig is the only pressure that makes sense.  

RE: steam pressure conversion

I didn't include inches of water in my list because that unit is often used in fan design and general HVAC work, where it is always a gauge pressure even if it is slightly below atmospheric e.g. a pressure of -10" water

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

RE: steam pressure conversion

Inches of water is also used in boiler furnace pressure measurement too.  And, yes, HK, that is closely related to fan pressure measurement too, isn't it?

rmw

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