Day 185

An interesting time in Packaging today. Doug Pengelly arrived with a bunch of hardware, and we put together four single-tap draught systems.

Unfortunately they were attached to kegs of carbonated water, not beer.

<shakes fist at heavens>

We then placed various types of draught hoses in the system and recorded the flow rate at various pressures, as well as the difference in pressure from the keg to the tap. For instance, using ¼” poly tubing at 10 psi, it would have taken a sluggish 18 seconds to fill a pint glass; increasing the pressure to 25 psi reduced that time to 10 seconds. When we switched to ¼” vinyl tubing, those times were reduced to 17 seconds and 9 seconds respectively. If we used larger diameter ⅜” vinyl tubing at 25 psi, we could get the pint pour time down to 7 seconds.

We then took the setup down the hall to the stairwell, put the keg and CO2 on the ground floor, fed the tube up the centre of the stairwell, and measured the flow rate when the beer was being pushed up 10 feet, 20 feet and 30 feet. The difference between a horizontal run and a vertical run wasn’t too significant for a 10-foor high push, but things really started to slow down at 20 feet: a 10-second pint suddenly took 15 seconds.

Then I went home, poured a beer, and estimated the flow rate as it filled the glass.

OK, I lied about the last part.

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