SpudFiles

So. for 1.5" pipe determining volume of a Fitting.

This is for a Stock that is mostly Fittings and not much pipe.

For a 90 Degree elbow it takes 1.5*Diameter of the pipe to complete the bend. *I THINK*

for a 1.5" pipe that would be 2.25" for an elbow.

for a 45 degree turn i think it is something like 1.46.... i cant remember.

Anyway is there a resource for helping calculate to the volume in fittings?

Not sure what you are trying to say...
Why not just fill it with water and then measure how much fit in?

Lentamentalisk ....you hit the nail on the head!

Thats exactly what I do becuase it is to hard to calculate all that stuff....

If you really want to calculate the volume of a stock, then you can.
How to do this:
Precisely measure all distances, this should take a few hours for a whole stock.
Then divide everything into small pieces, an elbow for example consists of pieces of cillinders and a piece of a sphere.
This might take hours of calculation.
Next count it all up, and voila! Youve got your volume.
It may have taken a whole day, and because of measuring faults it isnt very accurate, but hey, you saved water!

Or...

Approximate the bends in the elbows with polynomials or other elementary functions, create a 2-d cross section on the xy coordinate plane, choose your endpoints carefully, and use the washer method to calculate the volume of the fitting.

Volume = the integral from a to b of, parenthetically, R²-r², where a and b are the endpoints of the curves and R and r are your polynomial approximations.

Or...

Just do a fluid volume measurement. Even though some on this forum are mathematically capable of doing the above if provided a 2-d cross section of a fitting (which is elusive in the first place), mostly all would still just use the fluid volume measurement to save time and frustration.