unsupported span
unsupported span
(OP)
need a little help here, we're planning a pipe support system and looking for some info on unsuppported spans , we will have a 6" sch 40 pipe carrying sand (100 pcf) at 500F , I see a lot of data on pipe filled with H20 , thanks Bob





RE: unsupported span
RE: unsupported span
RE: unsupported span
You might evaluate the span lengths and support spacing using a base case for water-filled pipe, compute the corresponding bending stress, hold that bending stress constant, and shorten the span according to the higher density of the slurry.
Regards,
SNORGY.
RE: unsupported span
Natural frequency criteria gives very different answers, depending on if they are filled with liquid or gas.
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: unsupported span
I read this thread a while back, and perhaps took a lot of what's in it out of context.
thread378-49424: Tables for pipe support spacing
Regards,
SNORGY.
RE: unsupported span
Standard pipe rack distance beteen rack bents for pipes containing water (hydrotest load) is 20 ft and has been ever since I remember. U-Bolt any small lines to a bracket and U-bolt the bracket to the pipe next to it. Trying to save money with exact span distances is proven false economy in petroleum piping & refineries. Water plants may be another story entirely.
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: unsupported span
If your contained "fluid" is ~100 pcf. I would simply halve the spans for water (~62 pcf) and then check defelections based on the modulus of your piping material at your 500F operating temperature.
Do not forget to evaluate your pipe support loadings based on your new spans and watch out for huge loadings developed at any riser supports!
This is the type of system where I believe that a detailed pipe stress analysis would be useful.
My opinion only