As LI stated, this is a pretty common topic which you can find plenty of info about with a Google search. But, it would also be a little more helpful to get a few more details about what you are looking for and what your conditions are.
What's your pipe transporting?
What phase is it in?
What's the pipe size?
What's the schedule?
Are we talking continuously supported or simply supported?
..the list goes on..
Or, are you just looking for a simple chart? If so, the one below is a pretty common one out there. If you're needing a more detailed answer though, then you'll need to be a little more detailed in your question.
"Those who know, do. Those that understand, teach."
-Aristotle
Refinery pipe racks provide support for pipe every 20"-0". 20ft is an unwritten standard.
There isn't much refinery pipe less than 2" that runs in a pipe rack, but if one needs to, it is often additionally supported at the 10'mark by being attached to one of the larger pipes in the rack.
Reality used to affect the way we thought. Now we somehow believe that what we think affects reality.
ASME B31.1 and B31.3 contain tables of suggested spans for piping of various diameters and schedules.
Use of "span length" tables assumes that concentrated weights (like valves) are supported independently and considerations for gas/vapor piping and insulation have been considered..
There are many, many sources for this information ..... Have you tried to find it for yourself ?
Here, in the West, we have this device called "Google" that is very useful in this regard.
