Don't panic! I think saying 11oz = 0.372 floz is a mistook. For all practical purposes, I believe a fluid ounce of water weighs about an ounce, so the injector is good for 11oz weight and 11floz volume in one minute.

Strange that Imperial fan-boys are nowhere to be seen when questions like this pop up. Do they think imperial is wonderful because the tiny bit of it they know is familiar, not realising the full system is horribly complicated? Ignorance is bliss!

Dave

May be they're waitng for **** to rush in where angels fear to tread?

Andrew

The nominal sizes and flow rates are only an estimate to performance.

If it is of any help, I would suggest that you could easily use No3 or 16oz injectors on a 5" tank loco. The larger sizes tend to work more successfully than the smaller, and a No3 might fill half a glass in 10-20 seconds?

Sounds good Bob. You will have more than adequate pipe sizes as I use only 1/32" larger for No4 24oz injectors. You should find that you will only need a weak dribble of free flowing water before you turn the steam on as the injector will suck like mad and get all the water it wants. The thing to watch is any trace of air leak in that water feed because the suction will pull in any air and then the injector will misbehave.

Tube and Pipe are not the same. Tube normally has thinner walls and specified by its OD. Pipe is bigger and heavier and specified by its nominal bore size and a schedule/wall thickness. (refer to British Standard Pipe tables for the actual pipe OD)

Pipe is specified by a nominal (average) bore size because the actual inside diameter varies, depending on the thickness of the wall. The OD has to be a standard diameter to mate with attached fittings. (elbows, tees, etc).

(Bore size for piping was used because it is an easier unit for calculating the volume of liquid contained in the pipe)