World Oilfield Forum
recently I came across a question where I needed to calculate the capacity of a pipe for which I had just od and weight. I normally use the simple formula that is id2 -od2 divided by 1029.4
this works for annular capacity.
the same thing works for pipe capacity as id2/1029.4 if just pipe capacity is required but what if I don't have an id and just weight lb/ft.any one have any ideas?
thanks and regards
I am assuming that the pipe is down-hole or elsewhere otherwise you could caliper the ID. Engineerting toolbox has a formula that you need to work backwards to get thickness and then ID.
http://www.engineeringtoolbox.com/pipe-weight-calculation-d_745.html
If the outside diameter and the wall thickness of a steel pipe is known, the weight per foot can be expressed as:
m = 10.68 (d_{o} - t_{w}) t_{w} (1)
where
m = weight per foot (lbs/ft), d_{o} = outside diameter (inches), t_{w} = wall thickness (inches)
Example - Weight of 4" Schedule 40 Steel Pipe
The outside diameter (d_{o}) of 4" Schedule 40 Steel Pipe is 4.500 inches. The wall thickness is 0.237 inches. The weight per foot can be calculated using (1) as:
m = 10.68 (4.500 (in) - 0.237 (in)) 0.237 (in)
= 10.79 (lbs/ft)
There are many manuals that have charts of the Id of the pipe based on weight
calculate volume using o.d. subtract total weight of pipe divided by 2750
2750 is the weight of a barrle of steel
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