24" steam line stress analysis
24" steam line stress analysis
(OP)
I modelled a 24" steam line that is connected at one end to an existing pipe line coming from plant equipment and at the opposite end to an existing pipe line going into a steam header.
For a complete analysis I include at each end a section of the existing line. This existing line section is from my tie-in point going up to the first left and right anchor.
Is this correct?
Also just because I am connecting to a line, my guess is that the loading on the equipment nozzles where my existing lines are connected is not part of my concern.
Is this true?
For a complete analysis I include at each end a section of the existing line. This existing line section is from my tie-in point going up to the first left and right anchor.
Is this correct?
Also just because I am connecting to a line, my guess is that the loading on the equipment nozzles where my existing lines are connected is not part of my concern.
Is this true?





RE: 24" steam line stress analysis
Because forces & moments are not transferred across an anchor, your new line will not put any additional loads on the equipment nozzles (assuming they are on the opposite sides of the anchors on the exiting lines).
Richard Ay
COADE, Inc.
RE: 24" steam line stress analysis
Not strictly correct. Although the equipment loads will not be affected the anchor loads could well be. As such the revised loadings onto the anchor points on the existing lines need to be reviewed/assessed for acceptance.
RE: 24" steam line stress analysis
RE: 24" steam line stress analysis
RE: 24" steam line stress analysis
Most places that I've worked in the last 25 years what's been called an ANCHOR has really been just a Support, Line Stop and a Guide (usually with gaps).
Even if the pipe anchors were comepletely fixed to the structure, the majority of the rotations would pass right through the anchor, the structures are too flexible when compared the the stiffness of 24" pipe.
NozzleTwister
Houston, Texas
RE: 24" steam line stress analysis
Concur with you. I've got the same problem with a boiler supplier who told me that the pipe was "anchored" at a specific point 8 months ago but when the detail came in the point is a combination of a support/linestop and guide so the rotations are not constrained. Also the "anchor" is made up of bolt-on pipe shoes. Who's he trying to kid?