Bronze tubing and pressure

[HHornblower]

I have discarded the pressure-hypotheses because it is simply too dangerous to have on a wooden vessel.
I'm going to do a few rough calculations on the Byrne-Haldon model (With a double-action force-pump).
Thus, i need the dimensions of the force-pumps in the Roman timeframe. A few have been found. Does anyone know where I can get hold of some dimensions?

Regards,

Hornblower