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Table 3 Approximate maximum flow rates through different size cannulas

From: Fluid prescription practices of anesthesiologists managing patients undergoing elective colonoscopy: an observational study

Cannula size Maximum Flow rate (mls/min) Maximal volume of fluid that can be delivered for a given 25 min procedure
24 gauge 22 550 mls
22 gauge 35 875 mls
20 gauge 60 1500 mls
18 gauge 105 2625 mls
16 gauge 215 5375 mls
14 gauge 345 8625 mls