1L of IV Fluids will infuse at -
20g IV @ 50 ml/min
18g IV @ 90 ml/min
16g IV @ 150 ml/min
14g IV @ 300 ml/min
12g IV @ 450 ml/min
10g IV @ 600 ml/min
These rates are approximate and are the max that the catheter will infuse.
So, if I had a well placed 14g x 1" IV access with effort (pressure bag, manual effort) I could easily dump a liter in over 5 minutes.
Now, for all the folks that are interested in the hypertension issue and IV fluid rates. The very first time that I placed an internal jugular access line in a patient that was actively transecting (very high venous pressures) I used a 14g x 3" and the pressure from the venipuncture pushed the access needle out of the catheter - when hooked up to fluid the blood backed into the IVF bag in about 2 seconds. Definite venous access, no arterial - but Yikes! I was briefly terrified and blood covered.
I have seen this venous access issue in other patients receiving IVF without pressure, most recently in a ICH that was herniating and markedly hypertensive. So, I think that manual IVF rates would require adjustment for venous pressure in some patients.