Ok.
This is where I like to use both metric and american measurements.
There's 3.76 Liters in one US gallon.
There's 25.4 mm in one inch.
One kilo is 2.2 pounds.
One liter of water is one kilo.
If you're going with 4" piping, which actually has an ID of 4.5 inch, that's 114mm. Area wise, that's 40828 mm^2. Assuming a 5 foot tall stack, the volume would be ... 62222228 mm^3, aka 62 litres, or 16 .4 US gallons. The weight of the water would be about 136 pounds, for a 5 foot high, "4 inch" PVC tube.
Doing the same calcs for 1 1/2 piping (1 7/8 ID), I get 7238 mm^2 cross-section, 11031088 mm^3, aka 11 liters, which will weigh less than 25 pounds, still for a 5 foot stack.
I think you need to reconsider the actual benefit of this "buffer".
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